JDBCUtilsByDruid封装工具类

package com.qf.dao_.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.FileInputStream;
import java.sql.*;
import java.util.Properties;

public class JDBCUtilsByDruid {
    //私有化数据源
    private static DataSource ds;

    static {
        //实例化 Properties
        Properties properties = new Properties();
        try {
            //加载properties文件
            properties.load(new FileInputStream("src\\druid.properties"));
            //创建连接
            ds = DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //编写getConnection方法
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    //关闭连接
    //而是把使用的Connection对象放回连接池
    public static void close(ResultSet rs, Statement statement, Connection connection) {
        try {
            if (rs != null) {
                rs.close();
            }
            if (statement != null) {
                statement.close();
            }
            if (connection != null) {
                connection.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}