jdbc 09: preparedStatement实现增删改查

jdbc连接mysql，利用preparedStatement实现增删改查

package com.examples.jdbc.o9_preparedStatement实现增删改;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ResourceBundle;

/**
 * preparedStatement实现jdbc增删改
 */
public class Test {
    public static void main(String[] args) {
        preparedStatement();
    }

    /**
     * 利用preparedStatement实现jdbc增删改
     */
    private static void preparedStatement(){
        //资源绑定器绑定配置属性文件
        ResourceBundle resourceBundle = ResourceBundle.getBundle("config/jdbc");
        String driver = resourceBundle.getString("driver");
        String url = resourceBundle.getString("url");
        String userName = resourceBundle.getString("userName");
        String passWord = resourceBundle.getString("passWord");

        //2个资源对象
        Connection connection = null;
        PreparedStatement preparedStatement = null;

        //jdbc6步骤

        try {
            //1.
            Class.forName(driver);

            //2.
            connection = DriverManager.getConnection(url, userName, passWord);

            //3.

            //增
            //String sql = "insert into tb_user (uname, upasswd) values(?, ?)";
            //preparedStatement = connection.prepareStatement(sql);
            //preparedStatement.setString(1, "wangxun");
            //preparedStatement.setString(2, "coding");

            //改
            //String sql = "update tb_user set uname = ? where id = ?";
            //preparedStatement = connection.prepareStatement(sql);
            //preparedStatement.setString(1, "小涵");
            //preparedStatement.setInt(2, 1);

            //删
            String sql = "delete from tb_user where uname = ?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, "wangxun");

            //4.
            int num = preparedStatement.executeUpdate();
            //System.out.println(num == 1 ? "插入成功" : "插入失败");
            //System.out.println(num == 1 ? "修改成功" : "修改失败");
            System.out.println(num == 1 ? "删除成功" : "删除失败");

        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            //6.
            if(preparedStatement != null){
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if(connection != null){
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}