JDBC常用代码

try {
//加载驱动
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://127.0.0.1:3306/test";
//通过DriverManager获取连接
Connection conn=DriverManager.getConnection(url,"root","hello");
System.out.println("conn:"+conn);
//准备操作数据库
//Statement:用于执行静态SQL语句并返回它所生产结果的对象
Statement stm=conn.createStatement();
String sql="insert into test.new_table(t1,t2) values('t11','t22');";
Boolean ret =stm.execute(sql);
conn.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}

package com.wzh.JDBC;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/*
 * 连接工厂
 * 从面向对象的角度来说，凡是连接相关操作都给这个对象处理
 */
public class ConnectionFactory {

	private static final String URL="jdbc:mysql://127.0.0.1:3306/test";
	private static final String USER="root";
	private static final String PASSWORD="hello";
	private static final String DRIVER="com.mysql.jdbc.Driver";

	/**
	 * 获取数据库连接
	 * @return 成功返回 java.sql.Connection
	 * 	                  失败返回NULL
	 * */
	public static Connection GetConnection(){
		try {
			Class.forName(DRIVER);
			return DriverManager.getConnection(URL,USER,PASSWORD);
		} catch (Exception e) {
			System.out.println("%%%%%%%%%%%% 获取连接错误  %%%%%%%%%%%%%%");
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 关闭数据库资源
	 * @param conn
	 * @param stm
	 * @param rs
	 */
	public static void Close(Connection conn,Statement stm,ResultSet rs)
	{
		try {
			if(conn!=null) conn.close();
			if(stm!=null) stm.close();
			if(rs!=null) rs.close();
		} catch (Exception e) {
			System.out.println("%%%%%%%%%%%% 关闭连接错误  %%%%%%%%%%%%%%");
			e.printStackTrace();
		}

	}
}

　　

PreparedStatement 用法：

Connection conn=null;
        PreparedStatement stm=null;
        ResultSet rs=null;
        try {
            //加载驱动
            conn= ConnectionFactory.GetConnection();
            System.out.println("conn:"+conn);
            //准备操作数据库
            //Statement:用于执行静态SQL语句并返回它所生产结果的对象
            String sql="select * from new_table where t1=? and t2=?";
            stm=conn.prepareStatement(sql);
            stm.setString(, "");
            stm.setString(, "aa");
            System.out.println("sql:"+sql);
            rs =stm.executeQuery();

            while(rs.next()){
                System.out.println(rs.getString("t1"));
                System.out.println(rs.getBoolean("boo"));
            }
            System.out.println(rs);
            conn.close();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally{
            ConnectionFactory.Close(conn, stm, rs);
        }

Statement 用法：

Connection conn=null;
        Statement stm=null;
        ResultSet rs=null;
        try {
            //加载驱动

            conn= ConnectionFactory.GetConnection();
            System.out.println("conn:"+conn);
            //准备操作数据库
            //Statement:用于执行静态SQL语句并返回它所生产结果的对象
            stm=conn.createStatement();
            String sql="select * from new_table";
            rs =stm.executeQuery(sql);
            while(rs.next()){
                System.out.println(rs.getString("t1"));
                System.out.println(rs.getBoolean("boo"));
            }
            System.out.println(rs);
            conn.close();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally{
            ConnectionFactory.Close(conn, stm, rs);
        }