package util;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DataSourceUtils {
    
    private static ComboPooledDataSource ds=new ComboPooledDataSource();
    
    /**
     * 获取数据源
     * @return 连接池
     */
    public static DataSource getDataSource(){
        return ds ;
    }
    
    /**
      * 释放资源
     * @param conn
     * @param st
     * @param rs
     */
     public static void CloseResource(Connection conn,Statement st , ResultSet rs){
         closeResultSet(rs);
         closeStaement(st);
         closeConn(conn);
     }
    
    /**
     * 获取连接
     * @return 连接
     * @throws SQLException 
     */
    public static Connection getConnection() throws SQLException{
        return ds.getConnection();
    }
    
    /**
      *释放连接 
     * @param conn
     *     连接
     */
     public static void closeConn(Connection conn){
         if(conn!=null){
             try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                conn = null ;
            }
         }
     }
     
     /**
      * 释放语句执行者
     * @param st
     * 语句执行者
     */
    public static void closeStaement(Statement st){
         if(st!=null){
             try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                st = null ;
            }
         }
     }
    
    /**
     * 释放结果集
     * @param rs
     * 结果集
     */
    public static void closeResultSet(ResultSet rs){
         if(rs!=null){
             try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                rs = null ;
            }
         }
     }

}