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springJDBC01 uses springJDBC to operate the database

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Jul 14, 2017 pm 06:13 PM

database

1 What is springJDBC

Spring simplifies the workload of JDBC programming by abstracting JDBC access and creating a consistent API. We only need to declare SQL, call the appropriate SpringJDBC framework API, and process the result set. Transactions are managed by Spring and convert JDBC checked exceptions into Spring-consistent unchecked exceptions, simplifying development.

The steps to use traditional jdbc to operate the database: obtain connection → create Statement → perform data operations → obtain results → close Statement → close result set → close connection; while Spring JDBC uses a template class org.springframework.jdbc.core. JdbcTemplate encapsulates boilerplate code, and users can easily complete most data access operations through template classes.

2 Preparation

　2.1 jar package

spring-jdbc: springjdbc package

mysql: MySQL driver package
dbcp: database connection pool
spring-webmvc: springmvc framework package
annotation: the package that @resource needs to use, This package is included in Tomcat. If it is a web project and the running environment is Tomcat, there is no need to import this package
　Junit: unit test package

　2.2 Database (using mysql database 5.4)

<span style="color: #008080"> 1</span> <span style="color: #000000"># 创建用户表
</span><span style="color: #008080"> 2</span> <span style="color: #000000">CREATE TABLE t_user (
</span><span style="color: #008080"> 3</span> <span style="color: #000000">    user_id INT AUTO_INCREMENT PRIMARY KEY,
</span><span style="color: #008080"> 4</span> <span style="color: #000000">    user_name VARCHAR (30),
</span><span style="color: #008080"> 5</span> <span style="color: #000000">    credits INT,
</span><span style="color: #008080"> 6</span> <span style="color: #000000">    password VARCHAR (32),
</span><span style="color: #008080"> 7</span> <span style="color: #000000">    last_visit DATETIME,
</span><span style="color: #008080"> 8</span> <span style="color: #000000">    last_ip VARCHAR(23)
</span><span style="color: #008080"> 9</span> <span style="color: #000000">) ENGINE = InnoDB;
</span><span style="color: #008080">10</span> 
<span style="color: #008080">11</span> <span style="color: #000000"># 查询t_user表的结构
</span><span style="color: #008080">12</span> <span style="color: #000000">DESC t_user;
</span><span style="color: #008080">13</span> 
<span style="color: #008080">14</span> <span style="color: #000000"># 创建用户登录日志表
</span><span style="color: #008080">15</span> <span style="color: #000000">CREATE TABLE t_login_log (
</span><span style="color: #008080">16</span> <span style="color: #000000">    login_log_id INT AUTO_INCREMENT PRIMARY KEY,
</span><span style="color: #008080">17</span> <span style="color: #000000">    user_id INT,
</span><span style="color: #008080">18</span> <span style="color: #000000">    ip VARCHAR (23),
</span><span style="color: #008080">19</span> <span style="color: #000000">    login_datetime DATETIME
</span><span style="color: #008080">20</span> <span style="color: #000000">) ENGINE = InnoDB;
</span><span style="color: #008080">21</span> 
<span style="color: #008080">22</span> <span style="color: #000000">#查询 t_login_log 表的结构
</span><span style="color: #008080">23</span> <span style="color: #000000">DESC t_login_log;
</span><span style="color: #008080">24</span> 
<span style="color: #008080">25</span> <span style="color: #000000">INSERT INTO t_user
</span><span style="color: #008080">26</span> <span style="color: #000000">(user_name, password) 
</span><span style="color: #008080">27</span> <span style="color: #000000">VALUES
</span><span style="color: #008080">28</span> <span style="color: #000000">("wys", "182838" ); 
</span><span style="color: #008080">29</span> 
<span style="color: #008080">30</span> SELECT * FROM t_user;

Related tables

3 Environment setup (using eclipse)

　3.1 Use maven to import related jar packages

<span style="color: #008080"> 1</span> <span style="color: #0000ff"><span style="color: #800000">project </span><span style="color: #ff0000">xmlns</span><span style="color: #0000ff">="http://maven.apache.org/POM/4.0.0"</span><span style="color: #ff0000"> xmlns:xsi</span><span style="color: #0000ff">="http://www.w3.org/2001/XMLSchema-instance"</span><span style="color: #ff0000"> xsi:schemaLocation</span><span style="color: #0000ff">="http://maven.apache.org/POM/4.0.0 "</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 2</span>   <span style="color: #0000ff"><span style="color: #800000">modelVersion</span><span style="color: #0000ff">></span>4.0.0<span style="color: #0000ff"></span><span style="color: #800000">modelVersion</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 3</span>   <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>cn.xiangxu<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 4</span>   <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>baobaotao<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span>   <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>0.0.1-SNAPSHOT<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span>   <span style="color: #0000ff"><span style="color: #800000">packaging</span><span style="color: #0000ff">></span>war<span style="color: #0000ff"></span><span style="color: #800000">packaging</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 7</span>   <span style="color: #0000ff"><span style="color: #800000">dependencies</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 8</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 9</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>org.springframework<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>spring-webmvc<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">11</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>3.2.8.RELEASE<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">13</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">14</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>mysql<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">15</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>mysql-connector-java<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">16</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>5.1.37<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">17</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">18</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">19</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>org.springframework<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">20</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>spring-jdbc<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">21</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>3.2.8.RELEASE<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">22</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">23</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">24</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>commons-dbcp<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">25</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>commons-dbcp<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">26</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>1.4<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">27</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">28</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">29</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>javax.annotation<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">30</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>javax.annotation-api<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">31</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>1.2<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">32</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">33</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">34</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>junit<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">35</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>junit<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">36</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>4.12<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">37</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">38</span>   <span style="color: #0000ff"></span><span style="color: #800000">dependencies</span><span style="color: #0000ff">></span>
<span style="color: #008080">39</span> <span style="color: #0000ff"></span><span style="color: #800000">project</span><span style="color: #0000ff">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

pom.xml

　3.2 Create a properties file to store database related information

<span style="color: #008080">1</span> <span style="color: #000000">driverClassName=com.mysql.jdbc.Driver
</span><span style="color: #008080">2</span> <span style="color: #000000">url=jdbc:mysql://127.0.0.1:3306/sampledb
</span><span style="color: #008080">3</span> <span style="color: #000000">username=root
</span><span style="color: #008080">4</span> <span style="color: #000000">password=182838
</span><span style="color: #008080">5</span> <span style="color: #000000">maxActive=10
</span><span style="color: #008080">6</span> maxWait=3000

mysql.properties

　3.3 Create spring configuration file

　3.3.1 Configure the beans of the properties file

　3.3.2 Configuring database connection pool

　3.3.3 Configure jdbcTemplate

　3.3.4 Configure component scanning

<span style="color: #008080"> 1</span> <span style="color: #0000ff"></span><span style="color: #ff00ff">xml version="1.0" encoding="UTF-8"</span><span style="color: #0000ff">?></span>
<span style="color: #008080"> 2</span> <span style="color: #0000ff"><span style="color: #800000">beans </span><span style="color: #ff0000">xmlns</span><span style="color: #0000ff">="http://www.springframework.org/schema/beans"</span>
<span style="color: #008080"> 3</span> <span style="color: #ff0000">    xmlns:xsi</span><span style="color: #0000ff">="http://www.w3.org/2001/XMLSchema-instance"</span><span style="color: #ff0000"> xmlns:context</span><span style="color: #0000ff">="http://www.springframework.org/schema/context"</span>
<span style="color: #008080"> 4</span> <span style="color: #ff0000">    xmlns:jdbc</span><span style="color: #0000ff">="http://www.springframework.org/schema/jdbc"</span><span style="color: #ff0000"> xmlns:jee</span><span style="color: #0000ff">="http://www.springframework.org/schema/jee"</span>
<span style="color: #008080"> 5</span> <span style="color: #ff0000">    xmlns:tx</span><span style="color: #0000ff">="http://www.springframework.org/schema/tx"</span><span style="color: #ff0000"> xmlns:aop</span><span style="color: #0000ff">="http://www.springframework.org/schema/aop"</span>
<span style="color: #008080"> 6</span> <span style="color: #ff0000">    xmlns:mvc</span><span style="color: #0000ff">="http://www.springframework.org/schema/mvc"</span><span style="color: #ff0000"> xmlns:util</span><span style="color: #0000ff">="http://www.springframework.org/schema/util"</span>
<span style="color: #008080"> 7</span> <span style="color: #ff0000">    xmlns:jpa</span><span style="color: #0000ff">="http://www.springframework.org/schema/data/jpa"</span>
<span style="color: #008080"> 8</span> <span style="color: #ff0000">    xsi:schemaLocation</span><span style="color: #0000ff">="
</span><span style="color: #008080"> 9</span> <span style="color: #0000ff">         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
</span><span style="color: #008080">10</span> <span style="color: #0000ff">         http://www.springframework.org/schema/context/spring-context-3.2.xsd
</span><span style="color: #008080">11</span> <span style="color: #0000ff">         http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
</span><span style="color: #008080">12</span> <span style="color: #0000ff">         http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
</span><span style="color: #008080">13</span> <span style="color: #0000ff">         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
</span><span style="color: #008080">14</span> <span style="color: #0000ff">         http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
</span><span style="color: #008080">15</span> <span style="color: #0000ff">         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
</span><span style="color: #008080">16</span> <span style="color: #0000ff">         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
</span><span style="color: #008080">17</span> <span style="color: #0000ff">         http://www.springframework.org/schema/util/spring-util-3.2.xsd"</span><span style="color: #0000ff">></span>
<span style="color: #008080">18</span>     
<span style="color: #008080">19</span>     <span style="color: #008000"><!--</span><span style="color: #008000"> 读取mysql.properties文件 </span><span style="color: #008000">--></span>
<span style="color: #008080">20</span>     <span style="color: #0000ff"><span style="color: #800000">util:properties </span><span style="color: #ff0000">id</span><span style="color: #0000ff">="mysql"</span><span style="color: #ff0000"> location</span><span style="color: #0000ff">="classpath:config/mysql.properties"</span><span style="color: #0000ff">/></span>
<span style="color: #008080">21</span>     
<span style="color: #008080">22</span>     <span style="color: #008000"><!--</span><span style="color: #008000"> 配置连接池 </span><span style="color: #008000">--></span>
<span style="color: #008080">23</span>     <span style="color: #0000ff"><span style="color: #800000">bean </span><span style="color: #ff0000">id</span><span style="color: #0000ff">="ds"</span><span style="color: #ff0000"> class</span><span style="color: #0000ff">="org.apache.commons.dbcp.BasicDataSource"</span><span style="color: #ff0000"> destroy-method</span><span style="color: #0000ff">="close"</span><span style="color: #0000ff">></span>       
<span style="color: #008080">24</span>       <span style="color: #0000ff"><span style="color: #800000">property </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="driverClassName"</span><span style="color: #ff0000"> value</span><span style="color: #0000ff">="#{mysql.driverClassName}"</span> <span style="color: #0000ff">/></span>      
<span style="color: #008080">25</span>       <span style="color: #0000ff"><span style="color: #800000">property </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="url"</span><span style="color: #ff0000"> value</span><span style="color: #0000ff">="#{mysql.url}"</span> <span style="color: #0000ff">/></span>      
<span style="color: #008080">26</span>       <span style="color: #0000ff"><span style="color: #800000">property </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="username"</span><span style="color: #ff0000"> value</span><span style="color: #0000ff">="#{mysql.username}"</span> <span style="color: #0000ff">/></span>      
<span style="color: #008080">27</span>       <span style="color: #0000ff"><span style="color: #800000">property </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="password"</span><span style="color: #ff0000"> value</span><span style="color: #0000ff">="#{mysql.password}"</span> <span style="color: #0000ff">/></span>      
<span style="color: #008080">28</span>     <span style="color: #0000ff"></span><span style="color: #800000">bean</span><span style="color: #0000ff">></span>
<span style="color: #008080">29</span>     
<span style="color: #008080">30</span>     <span style="color: #008000"><!--</span><span style="color: #008000"> 配置jdbcTemplate </span><span style="color: #008000">--></span>
<span style="color: #008080">31</span>     <span style="color: #0000ff"><span style="color: #800000">bean </span><span style="color: #ff0000">id</span><span style="color: #0000ff">="jt"</span><span style="color: #ff0000"> class</span><span style="color: #0000ff">="org.springframework.jdbc.core.JdbcTemplate"</span><span style="color: #0000ff">></span>
<span style="color: #008080">32</span>         <span style="color: #0000ff"><span style="color: #800000">property </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="dataSource"</span><span style="color: #ff0000"> ref</span><span style="color: #0000ff">="ds"</span><span style="color: #0000ff">></span><span style="color: #800000">property</span><span style="color: #0000ff">></span>
<span style="color: #008080">33</span>     <span style="color: #0000ff"></span><span style="color: #800000">bean</span><span style="color: #0000ff">></span>
<span style="color: #008080">34</span>     
<span style="color: #008080">35</span>     <span style="color: #008000"><!--</span><span style="color: #008000"> 组件扫描 </span><span style="color: #008000">--></span>
<span style="color: #008080">36</span>     <span style="color: #0000ff"><span style="color: #800000">context:component-scan </span><span style="color: #ff0000">base-package</span><span style="color: #0000ff">="com.baobaotao"</span><span style="color: #0000ff">></span><span style="color: #800000">context:component-scan</span><span style="color: #0000ff">></span>
<span style="color: #008080">37</span>     
<span style="color: #008080">38</span> <span style="color: #0000ff"></span><span style="color: #800000">beans</span><span style="color: #0000ff">></span></span></span></span></span></span></span></span></span></span></span>

spring_mysql.xml

　　注意：我们不用配置spirng的主控制器，因为我们只是操作持久层；虽然我们用到了spring容器，但是我们可以通过编写代码来启动容器

　　3.4 项目结构图

4 代码实现数据库操作

　　4.1 编写实体类

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> com.baobaotao.entity;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.Serializable;
</span><span style="color: #008080"> 4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Date;
</span><span style="color: #008080"> 5</span> 
<span style="color: #008080"> 6</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> User <span style="color: #0000ff">implements</span><span style="color: #000000"> Serializable {
</span><span style="color: #008080"> 7</span> 
<span style="color: #008080"> 8</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">final</span> <span style="color: #0000ff">long</span> serialVersionUID = -3573627859368072117L<span style="color: #000000">;
</span><span style="color: #008080"> 9</span>     
<span style="color: #008080">10</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> Integer userId;
</span><span style="color: #008080">11</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> String userName;
</span><span style="color: #008080">12</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> Integer credits;
</span><span style="color: #008080">13</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> String password;
</span><span style="color: #008080">14</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> Date lastVisit;
</span><span style="color: #008080">15</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> String lastIp;
</span><span style="color: #008080">16</span>     
<span style="color: #008080">17</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> User() {
</span><span style="color: #008080">18</span>         <span style="color: #0000ff">super</span><span style="color: #000000">();
</span><span style="color: #008080">19</span>         <span style="color: #008000">//</span><span style="color: #008000"> TODO Auto-generated constructor stub</span>
<span style="color: #008080">20</span> <span style="color: #000000">    }
</span><span style="color: #008080">21</span>     
<span style="color: #008080">22</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> User(Integer userId, String userName, Integer credits, String password, Date lastVisit, String lastIp) {
</span><span style="color: #008080">23</span>         <span style="color: #0000ff">super</span><span style="color: #000000">();
</span><span style="color: #008080">24</span>         <span style="color: #0000ff">this</span>.userId =<span style="color: #000000"> userId;
</span><span style="color: #008080">25</span>         <span style="color: #0000ff">this</span>.userName =<span style="color: #000000"> userName;
</span><span style="color: #008080">26</span>         <span style="color: #0000ff">this</span>.credits =<span style="color: #000000"> credits;
</span><span style="color: #008080">27</span>         <span style="color: #0000ff">this</span>.password =<span style="color: #000000"> password;
</span><span style="color: #008080">28</span>         <span style="color: #0000ff">this</span>.lastVisit =<span style="color: #000000"> lastVisit;
</span><span style="color: #008080">29</span>         <span style="color: #0000ff">this</span>.lastIp =<span style="color: #000000"> lastIp;
</span><span style="color: #008080">30</span> <span style="color: #000000">    }
</span><span style="color: #008080">31</span> 
<span style="color: #008080">32</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">33</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">int</span><span style="color: #000000"> hashCode() {
</span><span style="color: #008080">34</span>         <span style="color: #0000ff">final</span> <span style="color: #0000ff">int</span> prime = 31<span style="color: #000000">;
</span><span style="color: #008080">35</span>         <span style="color: #0000ff">int</span> result = 1<span style="color: #000000">;
</span><span style="color: #008080">36</span>         result = prime * result + ((lastIp == <span style="color: #0000ff">null</span>) ? 0<span style="color: #000000"> : lastIp.hashCode());
</span><span style="color: #008080">37</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> result;
</span><span style="color: #008080">38</span> <span style="color: #000000">    }
</span><span style="color: #008080">39</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">40</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">boolean</span><span style="color: #000000"> equals(Object obj) {
</span><span style="color: #008080">41</span>         <span style="color: #0000ff">if</span> (<span style="color: #0000ff">this</span> ==<span style="color: #000000"> obj)
</span><span style="color: #008080">42</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">true</span><span style="color: #000000">;
</span><span style="color: #008080">43</span>         <span style="color: #0000ff">if</span> (obj == <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">44</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">45</span>         <span style="color: #0000ff">if</span> (getClass() !=<span style="color: #000000"> obj.getClass())
</span><span style="color: #008080">46</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">47</span>         User other =<span style="color: #000000"> (User) obj;
</span><span style="color: #008080">48</span>         <span style="color: #0000ff">if</span> (lastIp == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">49</span>             <span style="color: #0000ff">if</span> (other.lastIp != <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">50</span>                 <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">51</span>         } <span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (!<span style="color: #000000">lastIp.equals(other.lastIp))
</span><span style="color: #008080">52</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">53</span>         <span style="color: #0000ff">return</span> <span style="color: #0000ff">true</span><span style="color: #000000">;
</span><span style="color: #008080">54</span> <span style="color: #000000">    }
</span><span style="color: #008080">55</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> Integer getUserId() {
</span><span style="color: #008080">56</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> userId;
</span><span style="color: #008080">57</span> <span style="color: #000000">    }
</span><span style="color: #008080">58</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setUserId(Integer userId) {
</span><span style="color: #008080">59</span>         <span style="color: #0000ff">this</span>.userId =<span style="color: #000000"> userId;
</span><span style="color: #008080">60</span> <span style="color: #000000">    }
</span><span style="color: #008080">61</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String getUserName() {
</span><span style="color: #008080">62</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> userName;
</span><span style="color: #008080">63</span> <span style="color: #000000">    }
</span><span style="color: #008080">64</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setUserName(String userName) {
</span><span style="color: #008080">65</span>         <span style="color: #0000ff">this</span>.userName =<span style="color: #000000"> userName;
</span><span style="color: #008080">66</span> <span style="color: #000000">    }
</span><span style="color: #008080">67</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> Integer getCredits() {
</span><span style="color: #008080">68</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> credits;
</span><span style="color: #008080">69</span> <span style="color: #000000">    }
</span><span style="color: #008080">70</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setCredits(Integer credits) {
</span><span style="color: #008080">71</span>         <span style="color: #0000ff">this</span>.credits =<span style="color: #000000"> credits;
</span><span style="color: #008080">72</span> <span style="color: #000000">    }
</span><span style="color: #008080">73</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String getPassword() {
</span><span style="color: #008080">74</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> password;
</span><span style="color: #008080">75</span> <span style="color: #000000">    }
</span><span style="color: #008080">76</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setPassword(String password) {
</span><span style="color: #008080">77</span>         <span style="color: #0000ff">this</span>.password =<span style="color: #000000"> password;
</span><span style="color: #008080">78</span> <span style="color: #000000">    }
</span><span style="color: #008080">79</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> Date getLastVisit() {
</span><span style="color: #008080">80</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> lastVisit;
</span><span style="color: #008080">81</span> <span style="color: #000000">    }
</span><span style="color: #008080">82</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setLastVisit(Date lastVisit) {
</span><span style="color: #008080">83</span>         <span style="color: #0000ff">this</span>.lastVisit =<span style="color: #000000"> lastVisit;
</span><span style="color: #008080">84</span> <span style="color: #000000">    }
</span><span style="color: #008080">85</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String getLastIp() {
</span><span style="color: #008080">86</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> lastIp;
</span><span style="color: #008080">87</span> <span style="color: #000000">    }
</span><span style="color: #008080">88</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setLastIp(String lastIp) {
</span><span style="color: #008080">89</span>         <span style="color: #0000ff">this</span>.lastIp =<span style="color: #000000"> lastIp;
</span><span style="color: #008080">90</span> <span style="color: #000000">    }
</span><span style="color: #008080">91</span> 
<span style="color: #008080">92</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">93</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String toString() {
</span><span style="color: #008080">94</span>         <span style="color: #0000ff">return</span> "User [userId=" + userId + ", userName=" + userName + ", credits=" + credits + ", password=" +<span style="color: #000000"> password
</span><span style="color: #008080">95</span>                 + ", lastVisit=" + lastVisit + ", lastIp=" + lastIp + "]"<span style="color: #000000">;
</span><span style="color: #008080">96</span> <span style="color: #000000">    }
</span><span style="color: #008080">97</span> 
<span style="color: #008080">98</span> }

User.java

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> com.baobaotao.entity;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.Serializable;
</span><span style="color: #008080"> 4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Date;
</span><span style="color: #008080"> 5</span> 
<span style="color: #008080"> 6</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> LoginLog <span style="color: #0000ff">implements</span><span style="color: #000000"> Serializable {
</span><span style="color: #008080"> 7</span> 
<span style="color: #008080"> 8</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">final</span> <span style="color: #0000ff">long</span> serialVersionUID = 5176708814959439551L<span style="color: #000000">;
</span><span style="color: #008080"> 9</span>     
<span style="color: #008080">10</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> Integer loginLogId;
</span><span style="color: #008080">11</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> String userId;
</span><span style="color: #008080">12</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> String ip;
</span><span style="color: #008080">13</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> Date loginDatetime;
</span><span style="color: #008080">14</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">15</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">int</span><span style="color: #000000"> hashCode() {
</span><span style="color: #008080">16</span>         <span style="color: #0000ff">final</span> <span style="color: #0000ff">int</span> prime = 31<span style="color: #000000">;
</span><span style="color: #008080">17</span>         <span style="color: #0000ff">int</span> result = 1<span style="color: #000000">;
</span><span style="color: #008080">18</span>         result = prime * result + ((ip == <span style="color: #0000ff">null</span>) ? 0<span style="color: #000000"> : ip.hashCode());
</span><span style="color: #008080">19</span>         result = prime * result + ((loginDatetime == <span style="color: #0000ff">null</span>) ? 0<span style="color: #000000"> : loginDatetime.hashCode());
</span><span style="color: #008080">20</span>         result = prime * result + ((loginLogId == <span style="color: #0000ff">null</span>) ? 0<span style="color: #000000"> : loginLogId.hashCode());
</span><span style="color: #008080">21</span>         result = prime * result + ((userId == <span style="color: #0000ff">null</span>) ? 0<span style="color: #000000"> : userId.hashCode());
</span><span style="color: #008080">22</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> result;
</span><span style="color: #008080">23</span> <span style="color: #000000">    }
</span><span style="color: #008080">24</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">25</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">boolean</span><span style="color: #000000"> equals(Object obj) {
</span><span style="color: #008080">26</span>         <span style="color: #0000ff">if</span> (<span style="color: #0000ff">this</span> ==<span style="color: #000000"> obj)
</span><span style="color: #008080">27</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">true</span><span style="color: #000000">;
</span><span style="color: #008080">28</span>         <span style="color: #0000ff">if</span> (obj == <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">29</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">30</span>         <span style="color: #0000ff">if</span> (getClass() !=<span style="color: #000000"> obj.getClass())
</span><span style="color: #008080">31</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">32</span>         LoginLog other =<span style="color: #000000"> (LoginLog) obj;
</span><span style="color: #008080">33</span>         <span style="color: #0000ff">if</span> (ip == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">34</span>             <span style="color: #0000ff">if</span> (other.ip != <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">35</span>                 <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">36</span>         } <span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (!<span style="color: #000000">ip.equals(other.ip))
</span><span style="color: #008080">37</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">38</span>         <span style="color: #0000ff">if</span> (loginDatetime == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">39</span>             <span style="color: #0000ff">if</span> (other.loginDatetime != <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">40</span>                 <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">41</span>         } <span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (!<span style="color: #000000">loginDatetime.equals(other.loginDatetime))
</span><span style="color: #008080">42</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">43</span>         <span style="color: #0000ff">if</span> (loginLogId == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">44</span>             <span style="color: #0000ff">if</span> (other.loginLogId != <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">45</span>                 <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">46</span>         } <span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (!<span style="color: #000000">loginLogId.equals(other.loginLogId))
</span><span style="color: #008080">47</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">48</span>         <span style="color: #0000ff">if</span> (userId == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">49</span>             <span style="color: #0000ff">if</span> (other.userId != <span style="color: #0000ff">null</span><span style="color: #000000">)
</span><span style="color: #008080">50</span>                 <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">51</span>         } <span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (!<span style="color: #000000">userId.equals(other.userId))
</span><span style="color: #008080">52</span>             <span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;
</span><span style="color: #008080">53</span>         <span style="color: #0000ff">return</span> <span style="color: #0000ff">true</span><span style="color: #000000">;
</span><span style="color: #008080">54</span> <span style="color: #000000">    }
</span><span style="color: #008080">55</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> Integer getLoginLogId() {
</span><span style="color: #008080">56</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> loginLogId;
</span><span style="color: #008080">57</span> <span style="color: #000000">    }
</span><span style="color: #008080">58</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setLoginLogId(Integer loginLogId) {
</span><span style="color: #008080">59</span>         <span style="color: #0000ff">this</span>.loginLogId =<span style="color: #000000"> loginLogId;
</span><span style="color: #008080">60</span> <span style="color: #000000">    }
</span><span style="color: #008080">61</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String getUserId() {
</span><span style="color: #008080">62</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> userId;
</span><span style="color: #008080">63</span> <span style="color: #000000">    }
</span><span style="color: #008080">64</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setUserId(String userId) {
</span><span style="color: #008080">65</span>         <span style="color: #0000ff">this</span>.userId =<span style="color: #000000"> userId;
</span><span style="color: #008080">66</span> <span style="color: #000000">    }
</span><span style="color: #008080">67</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String getIp() {
</span><span style="color: #008080">68</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> ip;
</span><span style="color: #008080">69</span> <span style="color: #000000">    }
</span><span style="color: #008080">70</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setIp(String ip) {
</span><span style="color: #008080">71</span>         <span style="color: #0000ff">this</span>.ip =<span style="color: #000000"> ip;
</span><span style="color: #008080">72</span> <span style="color: #000000">    }
</span><span style="color: #008080">73</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> Date getLoginDatetime() {
</span><span style="color: #008080">74</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> loginDatetime;
</span><span style="color: #008080">75</span> <span style="color: #000000">    }
</span><span style="color: #008080">76</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setLoginDatetime(Date loginDatetime) {
</span><span style="color: #008080">77</span>         <span style="color: #0000ff">this</span>.loginDatetime =<span style="color: #000000"> loginDatetime;
</span><span style="color: #008080">78</span> <span style="color: #000000">    }
</span><span style="color: #008080">79</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> LoginLog() {
</span><span style="color: #008080">80</span>         <span style="color: #0000ff">super</span><span style="color: #000000">();
</span><span style="color: #008080">81</span>         <span style="color: #008000">//</span><span style="color: #008000"> TODO Auto-generated constructor stub</span>
<span style="color: #008080">82</span> <span style="color: #000000">    }
</span><span style="color: #008080">83</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> LoginLog(Integer loginLogId, String userId, String ip, Date loginDatetime) {
</span><span style="color: #008080">84</span>         <span style="color: #0000ff">super</span><span style="color: #000000">();
</span><span style="color: #008080">85</span>         <span style="color: #0000ff">this</span>.loginLogId =<span style="color: #000000"> loginLogId;
</span><span style="color: #008080">86</span>         <span style="color: #0000ff">this</span>.userId =<span style="color: #000000"> userId;
</span><span style="color: #008080">87</span>         <span style="color: #0000ff">this</span>.ip =<span style="color: #000000"> ip;
</span><span style="color: #008080">88</span>         <span style="color: #0000ff">this</span>.loginDatetime =<span style="color: #000000"> loginDatetime;
</span><span style="color: #008080">89</span> <span style="color: #000000">    }
</span><span style="color: #008080">90</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">91</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String toString() {
</span><span style="color: #008080">92</span>         <span style="color: #0000ff">return</span> "LoginLog [loginLogId=" + loginLogId + ", userId=" + userId + ", ip=" + ip + ", loginDatetime="
<span style="color: #008080">93</span>                 + loginDatetime + "]"<span style="color: #000000">;
</span><span style="color: #008080">94</span> <span style="color: #000000">    }    
</span><span style="color: #008080">95</span>     
<span style="color: #008080">96</span> }

LoginLog.java

　　4.2 编写UserDao接口

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> com.baobaotao.dao;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.List;
</span><span style="color: #008080"> 4</span> 
<span style="color: #008080"> 5</span> <span style="color: #0000ff">import</span><span style="color: #000000"> com.baobaotao.entity.User;
</span><span style="color: #008080"> 6</span> 
<span style="color: #008080"> 7</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">interface</span><span style="color: #000000"> UserDao {
</span><span style="color: #008080"> 8</span>     <span style="color: #008000">/**</span>
<span style="color: #008080"> 9</span> <span style="color: #008000">     * 向用户表中添加记录
</span><span style="color: #008080">10</span> <span style="color: #008000">     * </span><span style="color: #808080">@param</span><span style="color: #008000"> user 用户表实体对象
</span><span style="color: #008080">11</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">12</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> insert(User user);
</span><span style="color: #008080">13</span>     
<span style="color: #008080">14</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">15</span> <span style="color: #008000">     * 查询所有用户数据
</span><span style="color: #008080">16</span> <span style="color: #008000">     * </span><span style="color: #808080">@return</span><span style="color: #008000"> 由查询到记录组成的集合
</span><span style="color: #008080">17</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">18</span>     <span style="color: #0000ff">public</span> List<user><span style="color: #000000"> findAll();
</span><span style="color: #008080">19</span> 
<span style="color: #008080">20</span> }</user>

UserDao.java

　　4.3 编写UserDao接口的实现类UserDaoImpl　　

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> com.baobaotao.dao;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.sql.ResultSet;
</span><span style="color: #008080"> 4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.sql.SQLException;
</span><span style="color: #008080"> 5</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.List;
</span><span style="color: #008080"> 6</span> 
<span style="color: #008080"> 7</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.annotation.Resource;
</span><span style="color: #008080"> 8</span> 
<span style="color: #008080"> 9</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.jdbc.core.JdbcTemplate;
</span><span style="color: #008080">10</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.jdbc.core.RowMapper;
</span><span style="color: #008080">11</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.stereotype.Repository;
</span><span style="color: #008080">12</span> 
<span style="color: #008080">13</span> <span style="color: #0000ff">import</span><span style="color: #000000"> com.baobaotao.entity.User;
</span><span style="color: #008080">14</span> 
<span style="color: #008080">15</span> @Repository("userDao"<span style="color: #000000">)
</span><span style="color: #008080">16</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> UserDaoImpl <span style="color: #0000ff">implements</span><span style="color: #000000"> UserDao {
</span><span style="color: #008080">17</span>     
<span style="color: #008080">18</span>     @Resource(name="jt"<span style="color: #000000">)
</span><span style="color: #008080">19</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> JdbcTemplate jt;
</span><span style="color: #008080">20</span> 
<span style="color: #008080">21</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> insert(User user) {
</span><span style="color: #008080">22</span>         
<span style="color: #008080">23</span>         String sql = "INSERT INTO t_user " + 
<span style="color: #008080">24</span>                 "(user_name, password) " + 
<span style="color: #008080">25</span>                 "VALUES " + 
<span style="color: #008080">26</span>                 "(?, ?) "<span style="color: #000000">;
</span><span style="color: #008080">27</span>         Object [] args =<span style="color: #000000"> {user.getUserName(), user.getPassword()};
</span><span style="color: #008080">28</span>         Integer num =<span style="color: #000000"> jt.update(sql, args);
</span><span style="color: #008080">29</span>         <span style="color: #0000ff">if</span>(num > 0<span style="color: #000000">) {
</span><span style="color: #008080">30</span>             System.out.println("插入数据成功"<span style="color: #000000">);
</span><span style="color: #008080">31</span>         } <span style="color: #0000ff">else</span><span style="color: #000000"> {
</span><span style="color: #008080">32</span>             System.out.println("插入数据失败"<span style="color: #000000">);
</span><span style="color: #008080">33</span> <span style="color: #000000">        }
</span><span style="color: #008080">34</span>         
<span style="color: #008080">35</span> <span style="color: #000000">    }
</span><span style="color: #008080">36</span>     
<span style="color: #008080">37</span>     <span style="color: #0000ff">public</span> List<user><span style="color: #000000"> findAll() {
</span><span style="color: #008080">38</span>         String sql = "SELECT * FROM t_user "<span style="color: #000000">;
</span><span style="color: #008080">39</span>         List<user> users = jt.query(sql, <span style="color: #0000ff">new</span><span style="color: #000000"> UserRowMapper());
</span><span style="color: #008080">40</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> users;
</span><span style="color: #008080">41</span> <span style="color: #000000">    }
</span><span style="color: #008080">42</span>     
<span style="color: #008080">43</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">44</span> <span style="color: #008000">     * 结果集处理：经每一条查询记录转变成一个实体对象
</span><span style="color: #008080">45</span> <span style="color: #008000">     * </span><span style="color: #808080">@author</span><span style="color: #008000"> 三少
</span><span style="color: #008080">46</span> <span style="color: #008000">     *
</span><span style="color: #008080">47</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">48</span>     <span style="color: #0000ff">class</span> UserRowMapper <span style="color: #0000ff">implements</span> RowMapper<user><span style="color: #000000"> {
</span><span style="color: #008080">49</span> 
<span style="color: #008080">50</span>         <span style="color: #0000ff">public</span> User mapRow(ResultSet rs, <span style="color: #0000ff">int</span> rowNum) <span style="color: #0000ff">throws</span><span style="color: #000000"> SQLException {
</span><span style="color: #008080">51</span>             User user = <span style="color: #0000ff">new</span><span style="color: #000000"> User();
</span><span style="color: #008080">52</span>             user.setUserId(rs.getInt("user_id"<span style="color: #000000">));
</span><span style="color: #008080">53</span>             user.setUserName(rs.getString("user_name"<span style="color: #000000">));
</span><span style="color: #008080">54</span>             user.setCredits(rs.getInt("credits"<span style="color: #000000">));
</span><span style="color: #008080">55</span>             user.setPassword(rs.getString("password"<span style="color: #000000">));
</span><span style="color: #008080">56</span>             user.setLastVisit(rs.getDate("last_visit"<span style="color: #000000">));
</span><span style="color: #008080">57</span>             user.setLastIp(rs.getString("last_ip"<span style="color: #000000">));
</span><span style="color: #008080">58</span>             <span style="color: #0000ff">return</span><span style="color: #000000"> user;
</span><span style="color: #008080">59</span> <span style="color: #000000">        }
</span><span style="color: #008080">60</span> <span style="color: #000000">    }
</span><span style="color: #008080">61</span>     
<span style="color: #008080">62</span> }</user></user></user>

UserDaoImpl

　　　　使用springJDBC操作数据库时，程序员只需要编写相关的sql语句，待定参数可以用？代替，然后调用JdbcTemplate类的相关方法来执行sql语句就行啦。

　　　　JdbcTemplate类中的主要方法

　　　　　　execute方法：可以用于执行任何SQL语句，一般用于执行DDL语句；
　　　　　　update方法及batchUpdate方法：update方法用于执行新增、修改、删除等语句;
　　　　　　batchUpdate方法用于执行批处理相关语句；
　　　　　　query方法及queryForXXX方法：用于执行查询相关语句
　　　　　　call方法：用于执行存储过程、函数相关语句。

　　　　　　注意：

　　　　　　　　使用query方法时有三个参数

　　　　　　　　　　参数1　　sql语句字符串

　　　　　　　　　　参数2　　未知参数组

　　　　　　　　　　参数3　　查询结果处理（就是讲每一条查询记录变成一个实体对象，三少的一般做法是编写一个实现了RowMapper接口的内部类，然后创建一个该内部类对象来作为参数3）

　　4.4 项目结构图

5 测试类

　　5.1 测试前需要启动spring容器，因为我们的代码中使用到了spring容器的功能

　　5.2 编写测试方法

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> testDao;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.List;
</span><span style="color: #008080"> 4</span> 
<span style="color: #008080"> 5</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.junit.Before;
</span><span style="color: #008080"> 6</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.junit.Test;
</span><span style="color: #008080"> 7</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.context.ApplicationContext;
</span><span style="color: #008080"> 8</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.context.support.ClassPathXmlApplicationContext;
</span><span style="color: #008080"> 9</span> 
<span style="color: #008080">10</span> <span style="color: #0000ff">import</span><span style="color: #000000"> com.baobaotao.dao.UserDao;
</span><span style="color: #008080">11</span> <span style="color: #0000ff">import</span><span style="color: #000000"> com.baobaotao.entity.User;
</span><span style="color: #008080">12</span> 
<span style="color: #008080">13</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span><span style="color: #000000"> TestDao {
</span><span style="color: #008080">14</span>     
<span style="color: #008080">15</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> ApplicationContext ac;
</span><span style="color: #008080">16</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> UserDao userDao;
</span><span style="color: #008080">17</span>     
<span style="color: #008080">18</span> <span style="color: #000000">    @Before
</span><span style="color: #008080">19</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> init() {
</span><span style="color: #008080">20</span>         ac = <span style="color: #0000ff">new</span> ClassPathXmlApplicationContext("config/spring_mysql.xml"); <span style="color: #008000">//</span><span style="color: #008000"> 启动容器</span>
<span style="color: #008080">21</span> <span style="color: #000000">        System.out.println(ac);
</span><span style="color: #008080">22</span>         
<span style="color: #008080">23</span>         userDao = ac.getBean("userDao", UserDao.<span style="color: #0000ff">class</span>); <span style="color: #008000">//</span><span style="color: #008000"> 利用容器创建对象</span>
<span style="color: #008080">24</span> <span style="color: #000000">        System.out.println(userDao);
</span><span style="color: #008080">25</span> <span style="color: #000000">    }
</span><span style="color: #008080">26</span>     
<span style="color: #008080">27</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">28</span> <span style="color: #008000">     * 测试插入数据
</span><span style="color: #008080">29</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">30</span> <span style="color: #000000">    @Test
</span><span style="color: #008080">31</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> test01() {
</span><span style="color: #008080">32</span>         User user = <span style="color: #0000ff">new</span><span style="color: #000000"> User();
</span><span style="color: #008080">33</span>         user.setUserName("wym"<span style="color: #000000">);
</span><span style="color: #008080">34</span>         user.setPassword("111"<span style="color: #000000">);
</span><span style="color: #008080">35</span>         
<span style="color: #008080">36</span> <span style="color: #000000">        userDao.insert(user);
</span><span style="color: #008080">37</span> <span style="color: #000000">    }
</span><span style="color: #008080">38</span>     
<span style="color: #008080">39</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">40</span> <span style="color: #008000">     * 测试查询所有数据
</span><span style="color: #008080">41</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">42</span> <span style="color: #000000">    @Test
</span><span style="color: #008080">43</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> test02() {
</span><span style="color: #008080">44</span>         List<user> users =<span style="color: #000000"> userDao.findAll();
</span><span style="color: #008080">45</span>         <span style="color: #0000ff">for</span><span style="color: #000000">(User user : users) {
</span><span style="color: #008080">46</span> <span style="color: #000000">            System.out.println(user);
</span><span style="color: #008080">47</span> <span style="color: #000000">        }
</span><span style="color: #008080">48</span> <span style="color: #000000">    }
</span><span style="color: #008080">49</span>     
<span style="color: #008080">50</span>     
<span style="color: #008080">51</span> }</user>

测试类

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