JDBC数据库编程

package com.neusoft.utils;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class JdbcOracleTest {

/**

* @param args

*/

public static void main(String[] args) {

// 2.建立同数据库的连接

// url:统一资源定位符

String url = "jdbc:oracle:thin:@10.25.85.247:1521:orcl";

String user = "scott";

String password = "tiger";

Connection con = null;

Statement st = null;

String sql = "select * from DEPT";

String sql1 = "delete from USERTEST";

ResultSet rs = null;

PreparedStatement pst = null;

// 1.加载驱动

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

con = DriverManager.getConnection(url, user, password);

System.out.println("数据库连接成功！");

// 取消自动提交事务

con.setAutoCommit(false);

// 3.取得statement对象

st = con.createStatement();

// 4.发送statement到oracle中，并且查询表

rs = st.executeQuery(sql);

// 5.取出结果集中的数据

while (rs.next()) {

System.out.println("*************************");

String deptno = rs.getString(1);

System.out.println(deptno);

String dname = rs.getString(2);

System.out.println(dname);

String loc = rs.getString(3);

System.out.println(loc);

System.out.println("*************************");

}

// 6.删除数据

// int i = st.executeUpdate(sql1);

// System.out.println("删除的记录的条数："+i);

// 7.高级-->?占位符

pst = con.prepareStatement("insert into USERTEST values(?,?,?)");

// 给占位符赋值-->通过serXxx()方法

pst.setString(1, "5");

pst.setString(2, "u5");

pst.setString(3, "p5");

int i = pst.executeUpdate();

System.out.println("插入的记录的条数：" + i);

//事务处理-->提交

con.commit();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

try {

//事务处理-->回滚

con.rollback();

} catch (SQLException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

// 6.关闭资源

try {

if (rs != null) {

rs.close();

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

if (st != null) {

st.close();

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

if (pst != null) {

pst.close();

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

if (con != null) {

con.close();

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}