在连接数据库之前必须保证SQL Server 2008是采用SQL Server身份验证方式而不是windows身份验证方式。如果在安装时选用了后者,则重新设置如下: http://blog.163.com/jackie_howe/blog/static/19949134720122261121214/ SQL Server 2008装好后,默认协议是没
在连接数据库之前必须保证SQL Server 2008是采用SQL Server身份验证方式而不是windows身份验证方式。如果在安装时选用了后者,则重新设置如下:
http://blog.163.com/jackie_howe/blog/static/19949134720122261121214/
SQL Server 2008装好后,默认协议是没有开启的,可打开配置工具下的 SQL Server配置管理器中开启,如下2图:
保证SQL Server 2008是采用SQL Server身份验证方式下开始配置:
一、SQL Server 2008的配置:
1、安装好SQL Server 2008后,运行 开始 → 所有程序 → Microsoft SQL Server 2008 → 配置工具 → SQL Server配置管理器,在打开的窗口的左边找到 MSSQLSERVER的协议,在右边右单击 TCP/IP,选择 已启用。如果Named Pipes 未启用也设为启用。如图5所示:
图5
图6
4、然后重启数据库,重启完毕后,接下来使用命令测试1433端口是否打开。
5、开始菜单 → 运行cmd → 在命令提示符下输入:telnet 127.0.0.1 1433,(注意telnet与127之间有空格,1与1433之间有空格)若提示“不能打开到主机的连接,在端口 1433: 连接失败”,则说明1433端口没有打开,需要重新进行以上配置。若连接成功,显示如图8所示:
图8
注:Windows7如何开启telnet服务http://blog.163.com/jackie_howe/blog/static/199491347201251723939691/
二、环境变量CLASSPATH配置:
1、下载Microsoft JDBC Driver for SQL Server
http://www.microsoft.com/zh-cn/download/details.aspx?id=11774 (最新版4.0)
http://www.microsoft.com/zh-cn/download/details.aspx?id=21599 (3.0版)
http://www.microsoft.com/zh-cn/download/details.aspx?id=2505 (2.0版)
下载JDBC的驱动文件,例如下载得到的文件是sqljdbc_4.0.2206.100_chs.exe,解压文件。设将其解压到C:\Microsoft JDBC Driver 4.0 for SQL Server目录下。
2、在桌面上右击 我的电脑,依次选择 属性 → 高级 → 环境变量,在 系统变量中双击 CLASSPATH变量,追加“;C:\Microsoft JDBC Driver 4.0 for SQL Server\sqljdbc_4.0\chs\sqljdbc4.jar”若不存在应当新建CLASSPATH变量,并且将其值设为“C:\Microsoft JDBC Driver 4.0 for SQL Server\sqljdbc_4.0\chs\sqljdbc4.jar”。如图9示:
图9
3、连续点击 确定 以退出环境变量配置。
三、使用Eclipse测试连接SQL Server2008数据库:
1、打开SQL Server 2008,在其中新建数据库 Test,然后退出SQL Server 2008。
2、运行Eclipse,新建一个Java Project 名为 Test。
图10
提示:也可以把sqljdbc4jar类 放到jre/lib/ext下,并放到tomcat/lib下
这样就可以应用到所有jsp文件,减少对每个项目进行sqljdbc4jar的加载;
4、在Test中新建包pkg,在pkg中新建一个类Main,在其中输入代码如下:
<p><span><span>package</span><span> pkg</span><span>;</span> <span>import</span><span> java</span><span>.</span><span>sql</span><span>.*;</span> <span>public</span><span>class</span><span>Main</span><span>{</span> <span>public</span><span>static</span><span>void</span><span> main</span><span>(</span><span>String</span><span>[]</span><span> args</span><span>)</span> <span>{</span> <span>String</span><span> driverName</span><span>=</span><span>"com.microsoft.sqlserver.jdbc.SQLServerDriver"</span><span>;</span> <span>String</span><span> dbURL</span><span>=</span><span>"jdbc:sqlserver://localhost:1433;DatabaseName=填写你的数据库名"</span><span>;</span> <span>String</span><span> userName</span><span>=</span><span>"填写你的用户名,我的是sa"</span><span>;</span> <span>String</span><span> userPwd</span><span>=</span><span>"填写你的密码"</span><span>;</span> <span><span>try</span> <span>{</span> <span>Class</span><span>.</span><span>forName</span><span>(</span><span>driverName</span><span>);</span> <span>System</span><span>.</span><span>out</span><span>.</span><span>println</span><span>(</span><span>"加载驱动成功!"</span><span>);</span> <span>}</span><span>catch</span><span>(</span><span>Exception</span><span> e</span><span>){</span> <span> e</span><span>.</span><span>printStackTrace</span><span>();</span> <span>System</span><span>.</span><span>out</span><span>.</span><span>println</span><span>(</span><span>"加载驱动失败!"</span><span>);</span> <span>}</span> <span>try</span><span>{</span> <span>Connection</span><span> dbConn</span><span>=</span><span>DriverManager</span><span>.</span><span>getConnection</span><span>(</span><span>dbURL</span><span>,</span><span>userName</span><span>,</span><span>userPwd</span><span>);</span> <span>System</span><span>.</span><span>out</span><span>.</span><span>println</span><span>(</span><span>"连接数据库成功!"</span><span>);</span> <span>}</span><span>catch</span><span>(</span><span>Exception</span><span> e</span><span>)</span> <span>{</span> <span> e</span><span>.</span><span>printStackTrace</span><span>();</span> <span>System</span><span>.</span><span>out</span><span>.</span><span>print</span><span>(</span><span>"SQL Server连接失败!"</span><span>);</span> <span>}</span></span> <span>}</span> </span></p><p><span><span><span>}</span></span></span></p>
5、点击右键,选择run as——>Java Application,出现下图11则连接成功!
图11

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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