Java JDBC 插入数据

• 

  插入数据

  考虑我们有下面一个MySQL表：

  CREATE TABLE `tutorials_tbl` (
    `tutorial_id` int(11) NOT NULL AUTO_INCREMENT,
    `tutorial_title` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL,
    `tutorial_author` varchar(40) COLLATE utf8mb4_unicode_ci NOT NULL,
    `submission_date` date DEFAULT NULL,
    PRIMARY KEY (`tutorial_id`)
  ) ENGINE=InnoDB CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

  提示:不熟悉MySQL的同学可以到我们的MySQL教程进行学习。

  下面展示向tutorials_tbl表插入三条数据的例子：

  import java.sql.*;
   
  
  public class MyClass {
          //驱动字符串
          final static String driverStr="com.mysql.cj.jdbc.Driver";
          final static String dbHost = "192.168.61.125";  // 主机  可为ip地址
          final static String dbUserName = "root";  // 用户
          final static String dbPassword = "123456"; // 密码
          final static String dbPort = "3306"; // 端口
          final static String dbName = "mydb"; // 数据库名
          final static String connStr="jdbc:mysql://"+ dbHost +":"+ dbPort +"/"+ dbName +"?useSSL=false&serverTimezone=UTC"; 
       
      
      public static void main(String[] args){
          MyClass obj = new MyClass();
          Connection conn = obj.connect();
          try {
                  String tu1 = "Learn PHP";
                  String au1 = "John Poul";
                  String dt1 = "2020-02-27";
                  
                  String tu2 = "Learn MySQL";
                  String au2 = "Abdul S";
                  String dt2 = "2020-02-27";
                  
                  String tu3 = "JAVA Tutorial";
                  String au3 = "Sanjay";
                  String dt3 = "2007-05-06";
                  String sqlString = "INSERT INTO tutorials_tbl (tutorial_title , tutorial_author , submission_date) "+ 
                          "VALUES (?,?,?),(?,?,?),(?,?,?)";
                  PreparedStatement ps = conn.prepareStatement(sqlString);
                  ps.setString(1, tu1);
                  ps.setString(2, au1);
                  ps.setString(3, dt1);
                  ps.setString(4, tu2);
                  ps.setString(5, au2);
                  ps.setString(6, dt2);
                  
                  ps.setString(7, tu3);
                  ps.setString(8, au3);
                  ps.setString(9, dt3);
                  
                  
                          ps.executeUpdate();
                          System.out.println("执行成功");
                  } catch (SQLException e) {
                          System.out.println("执行失败");
                          e.printStackTrace();
                  }
      }
      
      // 链接
      protected Connection connect () {
          Connection conn = null;
          try{
                Class.forName(MyClass.driverStr);  // 加载驱动
                conn = DriverManager.getConnection(MyClass.connStr,MyClass.dbUserName,MyClass.dbPassword); // 连接
                System.out.println("连接成功");
              }catch(Exception ex){
                System.out.println("连接失败");
                System.out.println(ex.toString());
          }
          
          return conn;
          }    
      
  }

  通过编译，运行效果如下：

  连接成功
  执行成功
  

  提示：不懂编译的同学查看上一章：数据库连接