JDBC-增删查改操作

使用场景：测试家族族长分成时需要批量添加家族流水记录，但手动添加和SQL语句添加较为麻烦

操作步骤

运行环境：Java8+IDEA

1.打开IDEA

点击File—>New—>Project—>Package—>Java Class，文件目录如下：

Add--增加        Delete--删除

Find--查询        Revise--更改

2.下载Java连接MySQL驱动

下载网址：http://www.manong5.com/104575704/

下载好将包和之前的文件放在同一目录即可

3.编写代码

代码如下：

Add--增加 

package Data;

import java.sql.*;
import java.util.Scanner;

public class Add {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
 System.out.println("请输入id:");
 int id = in.nextInt();
 System.out.println("请输入uid:");
 int uid= in.nextInt();
 System.out.println("请输入family_id:");
 int family_id = in.nextInt();
 System.out.println("请输入room_uid:");
 int room_uid = in.nextInt();
 System.out.println("请输入gift_record_id:");
 int gift_record_id = in.nextInt();
 System.out.println("请输入charm_value:");
 int charm_value = in.nextInt();
 System.out.println("请输入type:");
 int type = in.nextInt();
 System.out.println("请输入create_time:");
 String create_time = in.next();
 try {
            Class.forName(Driver.class.getName());
 } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
 }
        //建立连接
 try {
            Connection con;
 String url = "jdbc:mysql://host:port/dbname";
 String user = "root";
 String password = "password";
 con = DriverManager.getConnection(url, user, password);
 String sql = "INSERT INTO family_charm_record (id,uid,family_id,room_uid,gift_record_id,charm_value,type,create_time) values(?,?,?,?,?,?,?,?)";
 PreparedStatement ps = con.prepareStatement(sql);
 ps.setInt(1, id);
 ps.setInt(2, uid);
 ps.setInt(3, family_id);
 ps.setInt(4, room_uid);
 ps.setInt(5, gift_record_id);
 ps.setInt(6, charm_value);
 ps.setInt(7, type);
 ps.setString(8, create_time);
 int num = ps.executeUpdate();
 System.out.println(num);
 ps.close();
 con.close();
 } catch (SQLException e) {
            System.out.println(e.getMessage());
 }
    }
}

BatchAdd--批量增加 

package Data;

import java.sql.*;
//import java.util.Scanner;

public class BatchAdd {
    public static void main(String[] args) {
        /*
 Scanner in = new Scanner(System.in);
 System.out.println("请输入id:");
 int id = in.nextInt();
 System.out.println("请输入uid:");
 int uid = in.nextInt();
 System.out.println("请输入family_id:");
 int family_id = in.nextInt();
 System.out.println("请输入room_uid:");
 int room_uid = in.nextInt();
 System.out.println("请输入gift_record_id:");
 int gift_record_id = in.nextInt();
 System.out.println("请输入charm_value:");
 int charm_value = in.nextInt();
 System.out.println("请输入type:");
 int type = in.nextInt();
 System.out.println("请输入create_time:");
 String create_time = in.next();
 */
 try {
            Class.forName(Driver.class.getName());
 } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
 }
        //建立连接
 try {
            Connection con;
 String url = "jdbc:mysql://host:port/dbname";
 String user = "root";
 String password = "password";
 con = DriverManager.getConnection(url, user, password);
 String sql = "INSERT INTO family_charm_record (id,uid,family_id,room_uid,gift_record_id,charm_value,type,create_time) values(?,?,?,?,?,?,?,?)";
 //PreparedStatement ps = con.prepareStatement(sql);
 int i = 1;
 while (i < 5) {
                PreparedStatement ps = con.prepareStatement(sql);
 ps.setInt(1, 983 + i);
 ps.setInt(2, 161004534);
 ps.setInt(3, 91);
 ps.setInt(4, 62480729);
 ps.setInt(5, 230121);
 ps.setInt(6, 1000);
 ps.setInt(7, 2);
 ps.setString(8, "2019-07-19 00:00:00");
 i++;
 int num = ps.executeUpdate();
 System.out.println(num);
 ps.close();
 }
            con.close();
 } catch (SQLException e) {
            System.out.println(e.getMessage());
 }
    }
}

Delete--删除

package Data;

import java.sql.*;

public class Delete {
    public static void main(String[] args) {
        try {
            Class.forName(Driver.class.getName());
 } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
 }
        String url = "jdbc:mysql://host:port/dbname";
 String user = "root";
 String password = "password";
 try {
            Connection con = DriverManager.getConnection(url, user, password);
 String sql = "delete from family_charm_record where id in (985,986)";
 PreparedStatement ps = con.prepareStatement(sql);
 int num = ps.executeUpdate();
 System.out.println(num);
 ps.close();
 con.close();
 } catch (SQLException e) {
            System.out.println(e.getMessage());
 }
    }
}

Find--查询

package Data;

import java.sql.*;

public class Find {
    public static void main(String[] args) {
        try {
            Class.forName(Driver.class.getName());
 } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
 }
        try {
            String url = "jdbc:mysql://host:port/dbname";
 String user = "root";
 String password = "password";
 Connection con = DriverManager.getConnection(url, user, password);
 String sql = "SELECT a.phone,n.noble_name FROM account a,noble_users n WHERE a.uid=n.uid;";
 PreparedStatement ps = con.prepareStatement(sql);
 ResultSet rs = ps.executeQuery();
 while (rs.next()) {
                  /*
 int id = rs.getInt(1);
 String name = rs.getString(2);
 String sex = rs.getString(3);
 int age = rs.getInt(4);
 String address = rs.getString(5);
 System.out.printf("%4s %4s %4s %4s %4s\n",id,name,sex,age,address);
 */
 String phone=rs.getString(1);
 String noble_name=rs.getString(2);
 System.out.printf("%4s %4s\n",phone,noble_name);
 }
            rs.close();
 ps.close();
 con.close();
 } catch (SQLException e) {
            System.out.println(e.getMessage());
 }
    }
}

Revise--更改

public class Revise {
    public static void main(String[] args) {
        try {
            Class.forName(Driver.class.getName());
 } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
 }
        String url = "jdbc:mysql://host:port/dbname";
 String user = "root";
 String password = "password";

 try {
            Connection con = DriverManager.getConnection(url, user, password);
 String sql = "update family_charm_record set uid=?,family_id=?,room_uid=?,gift_record_id=?,charm_value=?,type=?,create_time=? where id=984";
 PreparedStatement ps = con.prepareStatement(sql);
 /*
 ps.setString(1, "小林子");
 ps.setString(2, "女");
 ps.setInt(3, 21);
 ps.setString(4, "海南");
 ps.setInt(5, 7);
 */
 ps.setInt(1, 161004535);
 ps.setInt(2, 91);
 ps.setInt(3, 62480728);
 ps.setInt(4, 231089);
 ps.setInt(5, 2000);
 ps.setInt(6, 2);
 ps.setString(7, "2019-07-19 17:00:30");
 int num = ps.executeUpdate();
 System.out.println(num);
 ps.close();
 con.close();
 } catch (SQLException e) {
            System.out.println(e.getMessage());
 }
    }
}

注：使用时注意将host:port/dbname,password需要修改为自己项目的数据库连接

4.使用总结

使用循环批量增加数据时需要注意数据表的主键唯一性，不要和已有的发生冲突