Detailed explanation of how java implements basic operations on mysql

This article mainly introduces the method of using java to operate mysql to add, delete, modify and check, and analyzes the specific implementation techniques and related precautions for java to operate mysql database to add, delete, modify and check in the form of examples. Friends in need can refer to the following

The example of this article describes the method of using java to operate mysql to implement addition, deletion, modification and query. Share it with everyone for your reference, the details are as follows:

First, you need to import the jar package that connects MySQL and Java (mysql-connector-java-5.1.6-bin.jar) into the project .

package com.cn.edu;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class helloworld {
  private Connection conn = null;
  PreparedStatement statement = null;
  // connect to MySQL
  void connSQL() {
    String url = "jdbc:mysql://localhost:3306/hello?characterEncoding=UTF-8";
    String username = "root";
    String password = "root"; // 加载驱动程序以连接数据库
    try {
      Class.forName("com.mysql.jdbc.Driver" );
      conn = DriverManager.getConnection( url,username, password );
      }
    //捕获加载驱动程序异常
     catch ( ClassNotFoundException cnfex ) {
       System.err.println(
       "装载 JDBC/ODBC 驱动程序失败。" );
       cnfex.printStackTrace();
     }
     //捕获连接数据库异常
     catch ( SQLException sqlex ) {
       System.err.println( "无法连接数据库" );
       sqlex.printStackTrace();
     }
  }
  // disconnect to MySQL
  void deconnSQL() {
    try {
      if (conn != null)
        conn.close();
    } catch (Exception e) {
      System.out.println("关闭数据库问题 ：");
      e.printStackTrace();
    }
  }
  // execute selection language
  ResultSet selectSQL(String sql) {
    ResultSet rs = null;
    try {
      statement = conn.prepareStatement(sql);
      rs = statement.executeQuery(sql);
    } catch (SQLException e) {
      e.printStackTrace();
    }
    return rs;
  }
  // execute insertion language
  boolean insertSQL(String sql) {
    try {
      statement = conn.prepareStatement(sql);
      statement.executeUpdate();
      return true;
    } catch (SQLException e) {
      System.out.println("插入数据库时出错：");
      e.printStackTrace();
    } catch (Exception e) {
      System.out.println("插入时出错：");
      e.printStackTrace();
    }
    return false;
  }
  //execute delete language
  boolean deleteSQL(String sql) {
    try {
      statement = conn.prepareStatement(sql);
      statement.executeUpdate();
      return true;
    } catch (SQLException e) {
      System.out.println("插入数据库时出错：");
      e.printStackTrace();
    } catch (Exception e) {
      System.out.println("插入时出错：");
      e.printStackTrace();
    }
    return false;
  }
  //execute update language
  boolean updateSQL(String sql) {
    try {
      statement = conn.prepareStatement(sql);
      statement.executeUpdate();
      return true;
    } catch (SQLException e) {
      System.out.println("插入数据库时出错：");
      e.printStackTrace();
    } catch (Exception e) {
      System.out.println("插入时出错：");
      e.printStackTrace();
    }
    return false;
  }
  // show data in ju_users
  void layoutStyle2(ResultSet rs) {
    System.out.println("-----------------");
    System.out.println("执行结果如下所示:");
    System.out.println("-----------------");
    System.out.println(" 用户ID" + "/t/t" + "淘宝ID" + "/t/t" + "用户名"+ "/t/t" + "密码");
    System.out.println("-----------------");
    try {
      while (rs.next()) {
        System.out.println(rs.getInt("ju_userID") + "/t/t"
            + rs.getString("taobaoID") + "/t/t"
            + rs.getString("ju_userName")
             + "/t/t"+ rs.getString("ju_userPWD"));
      }
    } catch (SQLException e) {
      System.out.println("显示时数据库出错。");
      e.printStackTrace();
    } catch (Exception e) {
      System.out.println("显示出错。");
      e.printStackTrace();
    }
  }
  public static void main(String args[]) {
    helloworld h = new helloworld();
    h.connSQL();
    String s = "select * from ju_users";
    String insert = "insert into ju_users(ju_userID,TaobaoID,ju_userName,ju_userPWD) values("+8329+","+34243+",'mm','789')";
    String update = "update ju_users set ju_userPWD =123 where ju_userName= 'mm'";
    String delete = "delete from ju_users where ju_userName= 'mm'";
    if (h.insertSQL(insert) == true) {
      System.out.println("insert successfully");
      ResultSet resultSet = h.selectSQL(s);
      h.layoutStyle2(resultSet);
    }
    if (h.updateSQL(update) == true) {
      System.out.println("update successfully");
      ResultSet resultSet = h.selectSQL(s);
      h.layoutStyle2(resultSet);
    }
    if (h.insertSQL(delete) == true) {
      System.out.println("delete successfully");
      ResultSet resultSet = h.selectSQL(s);
      h.layoutStyle2(resultSet);
    }
    h.deconnSQL();
  }
}

notice:

1. The commonly used driver now is com.mysql.jdbc.Driver, Although the previous org driver encapsulated com.mysql.jdbc.Driver, it was not easy to use and was outdated.

2. prepareStatement(sql) is a subclass of statement, which is easier to use than statement.

3. If the int value is defined in the database, then the int must be mentioned separately in the sql statement. Such as "....values("+8329+","+34243+",'mm','789')"

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