javaSE 第三方插件commons-dbutils, 操作数据库的工具类, QueryRunner类, (update() 增、删、改操作)

MySql驱动(jar包)下载:https://pan.baidu.com/s/19BYnGbO3l5MOOic5K4Ooaw  密码:mwoh

第三方插件(commons-dbutils)下载:https://pan.baidu.com/s/17cyAXHZLgiayx5Y_VHvawQ  密码:6om2

commons-dbutils-1.6.jar---右键---Build Path---Add to Build Path 


Demo.java:

package cn.xxx.demo;

import java.sql.Connection;
import java.sql.SQLException;

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;

import cn.xxx.jdbcutil.JDBCUtilsConfig;

/*
 *  使用QueryRunner类,实现对数据表的
 *  insert delete update
 *  调用QueryRunner类的方法 update (Connection con,String sql,Object... param)
 *  Object...param 可变参数,Object类型;用于替换SQL语句中的?占位符
 */
public class Demo {
	private static Connection con = JDBCUtilsConfig.getConnection();
	public static void main(String[] args)throws SQLException {
		//insert();
		delete();
	}

	public static void delete()throws SQLException{
		QueryRunner qr = new QueryRunner();	 //创建QueryRunner类对象
		String sql = "DELETE FROM sort WHERE sid=?";
		int row = qr.update(con, sql, 8); // 执行SQL语句。 第三个参数可以是不定参数Object... ;也可以是单个Object。
		System.out.println(row);
		DbUtils.closeQuietly(con);  // 关闭资源
	}

	public static void insert()throws SQLException{
		QueryRunner qr = new QueryRunner();  //创建QueryRunner类对象
		String sql = "INSERT INTO sort (sname,sprice,sdesc)VALUES(?,?,?)";
		Object[] params = {"体育用品",289.32,"购买体育用品"};  // 不定长的参数可以用数组传递
		int row = qr.update(con, sql, params);  // 执行SQL语句
		System.out.println(row);
		DbUtils.closeQuietly(con);  // 关闭资源
	}
}
JDBCUtilsConfig.java(自定义的数据库工具类,用于获取数据库连接对象):
package cn.xxx.jdbcutil;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class JDBCUtilsConfig {
	private static Connection con ;
	private static String driverClass;
	private static String url;
	private static String username;
	private static String password;
	
	static{  // 静态代码块,只会被执行一次
		try{
			readConfig();
			Class.forName(driverClass);
			con = DriverManager.getConnection(url, username, password);
		}catch(Exception ex){
			throw new RuntimeException("数据库连接失败");
		}
	}
	
	private static void readConfig()throws Exception{
		InputStream in = JDBCUtilsConfig.class.getClassLoader().getResourceAsStream("database.properties");
		Properties pro = new Properties();
		pro.load(in);
		driverClass=pro.getProperty("driverClass");
		url = pro.getProperty("url");
		username = pro.getProperty("username");
		password = pro.getProperty("password");
	}
	
	
	public static Connection getConnection(){
		return con;
	}
	
}


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