JDBC连接DB2、Oracle、MySQL、PostgreSQL
JDBC连接DB2、Oracle、MySQL、PostgreSQL，并取得当前时间得实用代码package com.terac.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class DBTest {
public static void main(String[] args) {
try {
String user = "user";
String password = "password";
String driver = "COM.ibm.db2.jdbc.net.DB2Driver";
//"oracle.jdbc.driver.OracleDriver";
//"com.mysql.jdbc.Driver";
//"org.postgresql.Driver";
String url = "jdbc:db2://localhost/a";
//"jdbc:oracle:thin:@localhost:1521:a";
//"jdbc:mysql://localhost/a";
//"jdbc:postgresql://localhost:5740/a";
String sql = "SELECT current timestamp FROM sysibm.sysdummy1";
//"SELECT sysdate FROM dual";
//"SELECT now()";
//"SELECT current_timestamp";
Class.forName(driver).newInstance();
Connection c = DriverManager.getConnection(url, user, password);
Statement stmt = c.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
System.out.println(rs.getString(1));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
1:建立、启动oracle数据库
2：在Tomcat中建立oracle驱动程序
oracle JDBC驱动程序的位置：oracle\ora90\jdbc\lib\classes12.jar
将此驱动程序拷贝到Tomcat5.5\common\lib下
此时Tomcat就可以连接到oracle驱动程序
3：连接操作数据库：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<%--
使用JDBC连接Oracle数据库
使用MLDN数据库
用户名：scott
密码：tiger
--%>
<%!
String DBDRIVER = "oracle.jdbc.driver.OracleDriver" ;//驱动
String DBURL = "jdbc:oracle:thin:@localhost:1521:mldn" ;//1521是端口，mldn是数据源
String DBUSER = "scott" ;
String DBPASSWORD = "tiger" ;
Connection conn = null ;
Statement stmt = null ;
%>
<%
try
{
Class.forName(DBDRIVER) ;
// 连接时必须填写用户名及密码
conn = DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD) ;
// 创建表的SQL语句
String sql = "CREATE TABLE mldntab (name varchar(20))" ;
stmt = conn.createStatement() ;
stmt.executeUpdate(sql) ;
stmt.close() ;
conn.close() ;
}
catch(Exception e)
{
out.println(e) ;
}
%>
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