IEDA的基本的六步操作

Posted 2020-12-13 li-ding-yong

 

IEDA的基本六步操作

1. 连接数据库
2. 编写带有？sql的语句
3. 预编译
4. 填充占位符
5. 执行
6. 关闭流

案例

---

package cn.kgc;

import Utile.Test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class Lianxi {
    public static void main(String[] args) throws Exception {
       /*连接数据库*/
        Connection connection = Test.getConnection();
        /*编写带有？sql语句*/
        String sql = "INSERT INTO used (id,NAME,age) VALUES (?,?,?)";
        /*预编译*/
        PreparedStatement pstm = connection.prepareStatement(sql);
        /*填充占位符*/
        pstm.setObject(1,4);
        pstm.setObject(2,"天");
        pstm.setObject(3,67);
        //5.执行
         pstm.executeUpdate();
        /* 6.关闭流*/
         Test.close(pstm,connection);
    }
}

为了方便使用可以把连接数据库和关闭驱动写出一个方法，需要使用直接调用即可

---

package Utile;

import java.sql.*;

public class Test {
    public static Connection  getConnection(){
        Connection connection=null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/kh87", "root", "123789");
        } catch (Exception e) {
            e.printStackTrace();
        }
        //连接数据库

        return connection;
    }

    public static void close(PreparedStatement pstm, Connection connection){
        try {
            pstm.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }


        try {
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }


    }
    public static void close2(ResultSet rs,PreparedStatement pstm, Connection connection){

        try {
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }


        try {
            pstm.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }


        try {
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }


    }

---

执行结果：