Druid数据库连接池工具类

Posted 2022-07-19 newcityboy

package cn.itcast.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * @author newcityman
 * @date 2019/8/16 - 23:56
 * Druid 的工具类
 */
public class JDBCUtils 
    //    1、定义成员变量DataSource
    private static DataSource ds;

    static 
        try 
//        2、加载配置文件
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
//        3、获取连接对象Datasource
           ds = DruidDataSourceFactory.createDataSource(pro);
         catch (IOException e) 
            e.printStackTrace();
         catch (Exception e) 
            e.printStackTrace();
        
    

    /*
    * 获取连接的方法
    * */
    public static Connection getConnetion() throws SQLException 
        return ds.getConnection();
    

    /*
    * 释放资源
    * */
    public static void  close(Statement stmt,Connection conn)
       /* if(stmt!=null)
            try 
                stmt.close();
             catch (SQLException e) 
                e.printStackTrace();
            
        

        if(conn!=null)
            try 
                conn.close();
             catch (SQLException e) 
                e.printStackTrace();
            
        */
       close(null,stmt,conn);
    

    /*
     * 释放资源
     * */
    public static void  close(ResultSet rs,Statement stmt, Connection conn)
        if(rs!=null)
            try 
                rs.close();
             catch (SQLException e) 
                e.printStackTrace();
            
        

        if(stmt!=null)
            try 
                stmt.close();
             catch (SQLException e) 
                e.printStackTrace();
            
        

        if(conn!=null)
            try 
                conn.close();
             catch (SQLException e) 
                e.printStackTrace();
            
        

    
    
    /*
    * 获取连接池方法
    * */
    public static DataSource getDataSource()
        return ds;