JDBC编程 之 增删改查

JDBC编程之数据增加，更改，查询，删除

package com.good.jdbc;

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

public class Main {
    //1数据库连接的方法就独立出来了
    public static Connection getConnection(){
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp_db","root","");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }
    //2然后编写一个同样是静态的向数据表中插入数据的方法
    public static void insert(){
        //获取数据库连接
        Connection conn = getConnection();
        try {
            String sql = "INSERT INTO tbl_user(name,password,email)" +
                         "VALUES('Tom','123456','tom@gmail.com')";
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("向用户表中插入了 " + count + " 条记录");
             conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //3接下来写一个更新的方法
    public static void update(){
        //获取数据库连接
        Connection conn = getConnection();
        try {
            String sql = "UPDATE tbl_user SET email='tom@126.com' WHERE name = 'Tom'";
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("向用户表中更新了 " + count + " 条记录");
             conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //4删除记录的方法
    public static void delete(){
        //获取数据库连接
        Connection conn = getConnection();
        try {
            String sql = "DELETE FROM tbl_user WHERE name = 'TOM'";
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("向用户表中删除了 " + count + " 条记录");
             conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
//        insert();
        delete();
        update();
    }
}