简单的JDBC的增删改查操作，附源码

Posted 2020-09-26 夕阳游子

  1 package com.xyyz.jdbc;
  2 
  3 import java.sql.Connection;
  4 import java.sql.DriverManager;
  5 import java.sql.PreparedStatement;
  6 import java.sql.ResultSet;
  7 
  8 public class JDBCDemo {
  9 
 10     public static void main(String[] args) throws Exception {
 11         query();
 12         insert();
 13         query();
 14         update();
 15         query();
 16         delete();
 17         query();
 18     }
 19 
 20     /**
 21      * 查询代码
 22      * 
 23      * @throws Exception
 24      */
 25     public static void query() throws Exception {
 26         // 注册驱动
 27         Class.forName("com.mysql.jdbc.Driver");
 28         // 连接数据需要的参数
 29         String url = "jdbc:mysql:///jdbctestdata";
 30         String user = "root";
 31         String password = "root";
 32         // 获取数据库连接
 33         Connection connection = DriverManager.getConnection(url, user, password);
 34         String sql = "select * from jdbctestdata";
 35         // 获取预编译对象
 36         PreparedStatement prepareStatement = connection.prepareStatement(sql);
 37         // 执行sql语句
 38         ResultSet resultSet = prepareStatement.executeQuery();
 39         // 遍历打印sql语句
 40         while (resultSet.next()) {
 41             System.out.println(resultSet.getInt(1) + "--" + resultSet.getString(2));
 42         }
 43         // 关闭释放资源
 44         resultSet.close();
 45         prepareStatement.close();
 46         connection.close();
 47     }
 48 
 49     /**
 50      * 插入数据
 51      */
 52     public static void insert() throws Exception {
 53         // 注册驱动
 54         Class.forName("com.mysql.jdbc.Driver");
 55         // 连接数据需要的参数
 56         String url = "jdbc:mysql:///jdbctestdata";
 57         String user = "root";
 58         String password = "root";
 59         // 获取数据库连接
 60         Connection connection = DriverManager.getConnection(url, user, password);
 61         String sql = "insert into jdbctestdata value(?,?,?)";
 62         // 获取预编译对象
 63         PreparedStatement prepare = connection.prepareStatement(sql);
 64         prepare.setString(1, "6");
 65         prepare.setString(2, "小白");
 66         prepare.setString(3, "30");
 67         int i = prepare.executeUpdate();
 68         System.out.println("i=" + i);
 69         // 执行sql语句
 70         prepare.close();
 71         connection.close();
 72     }
 73 
 74     /**
 75      * 更新数据
 76      */
 77     public static void update() throws Exception {
 78         // 注册驱动
 79         Class.forName("com.mysql.jdbc.Driver");
 80         // 连接数据需要的参数
 81         String url = "jdbc:mysql:///jdbctestdata";
 82         String user = "root";
 83         String password = "root";
 84         // 获取数据库连接
 85         Connection connection = DriverManager.getConnection(url, user, password);
 86         String sql = "update jdbctestdata set name=? , age=? where id=?";
 87         // 获取预编译对象
 88         PreparedStatement prepare = connection.prepareStatement(sql);
 89         prepare.setString(1, "小红");
 90         prepare.setString(2, "20");
 91         prepare.setString(3, "6");
 92         int i = prepare.executeUpdate();
 93         System.out.println("i=" + i);
 94         // 执行sql语句
 95         prepare.close();
 96         connection.close();
 97     }
 98 
 99     /**
100      * 删除数据
101      */
102     public static void delete() throws Exception {
103         // 注册驱动
104         Class.forName("com.mysql.jdbc.Driver");
105         // 连接数据需要的参数
106         String url = "jdbc:mysql:///jdbctestdata";
107         String user = "root";
108         String password = "root";
109         // 获取数据库连接
110         Connection connection = DriverManager.getConnection(url, user, password);
111         String sql = "delete from jdbctestdata where id = ?";
112         // 获取预编译对象
113         PreparedStatement prepare = connection.prepareStatement(sql);
114         prepare.setString(1, "6");
115         int i = prepare.executeUpdate();
116         System.out.println("i=" + i);
117         // 执行sql语句
118         prepare.close();
119         connection.close();
120     }
121 
122 }

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