功能:将数据库中的数据读到java类cube中,并计算出正方体的体积。1.使用PL/SQL Developor设计一个表格,名为first; Table -gt
功能:将数据库中的数据读到java类cube中,,并计算出正方体的体积。
1.使用PL/SQL Developor设计一个表格,名为first;
Table -> new Table,设计表空间,与字段的大小,以及主键;
Table -> first -> edit data,填入所需要的数据,则一个表格就生成了。
2.使用java代码访问Oracle数据库,代码如下:
import java.sql.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Vector;
public class Test {
static Vector
public static void main(String[] args) throws ClassNotFoundException, SQLException{
String driver = "oracle.jdbc.driver.OracleDriver";
String strUrl = "jdbc:oracle:thin:@a9ae3e7c1051465:1521:idpdb";//idpdb为数据库名称
Connection conn = null;
ResultSet rsResult=null;
Statement stmt=null;
Class.forName(driver);
//第二个参数为数据库用户名,第三个参数为数据库密码
conn = DriverManager.getConnection(strUrl,"idp_pub_m","idpapp");
stmt=conn.createStatement();
rsResult=stmt.executeQuery("select * from first");
while(rsResult.next()){
Cube cub = new Cube(rsResult.getInt(1),rsResult.getInt(2), rsResult.getInt(3),rsResult.getInt(4));
CubeObjects.add(cub);
}
int i = 0;
for(Cube cube:CubeObjects){
System.out.println("矩形次序" + ++i + " : "+ calculate(cube));
}
}
static int calculate(Cube cube){
try{
if(cube.Height == cube.Length && cube.Length==cube.Width){
return cube.Height*cube.Length*cube.Width;
}else{
throw new Exception("不是正方体");
}
}catch(Exception e){
System.out.println(e.getMessage());
}
return 0;
}
}
class Cube{
int ID = 0;
int Length = 0;
int Width = 0;
int Height = 0;
public Cube(int ID,int Length, int Width, int Height){
this.ID = ID;
this.Length = Length;
this.Width = Width;
this.Height = Height;
}
}

oracle asm指的是“自动存储管理”,是一种卷管理器,可自动管理磁盘组并提供有效的数据冗余功能;它是做为单独的Oracle实例实施和部署。asm的优势:1、配置简单、可最大化推动数据库合并的存储资源利用;2、支持BIGFILE文件等。

方法:1、利用“select*from user_indexes where table_name=表名”语句查询表中索引;2、利用“select*from all_indexes where table_name=表名”语句查询所有索引。

在Oracle中,可利用lsnrctl命令查询端口号,该命令是Oracle的监听命令;在启动、关闭或重启oracle监听器之前可使用该命令检查oracle监听器的状态,语法为“lsnrctl status”,结果PORT后的内容就是端口号。

在oracle中,可以利用“TO_SINGLE_BYTE(String)”将全角转换为半角;“TO_SINGLE_BYTE”函数可以将参数中所有多字节字符都替换为等价的单字节字符,只有当数据库字符集同时包含多字节和单字节字符的时候有效。

在oracle中,可以利用“drop sequence sequence名”来删除sequence;sequence是自动增加数字序列的意思,也就是序列号,序列号自动增加不能重置,因此需要利用drop sequence语句来删除序列。

在oracle中,可以利用“select ... From all_tab_columns where table_name=upper('表名') AND owner=upper('数据库登录用户名');”语句查询数据库表的数据类型。

方法:1、利用“LOWER(字段值)”将字段转为小写,或者利用“UPPER(字段值)”将字段转为大写;2、利用“REGEXP_LIKE(字符串,正则表达式,'i')”,当参数设置为“i”时,说明进行匹配不区分大小写。

方法:1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数;2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。


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