## housekeeper project (tools layer)

Housekeeper items (tools layer)

 

package cn.kgc.gjp.tools;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * @author liurui
 * @date $ {DATE} 15:21
 * Create a connection pool C3P0 xml tools
 * Connection pool DataSource (javax.sql) Interface
 * getConnection()
 * Steps for usage
 * 1 Create a static object member position ComboPooleDataSource
 * Copy the two files to the src directory c3p0xml
 *. ComboPooleDataSource Object 3 from the definition of static methods to obtain and return Connection
 * 4 defines a method to release resources
 * / 
Public  class JDBCUtils {
         // . 1 creates a static member in the position of the object ComboPooleDataSource 
    Private  static ComboPooledDataSource the dataSource = new new ComboPooledDataSource ();
     // Get Connection ComboPooleDataSource static methods defined in the object 3 and returns from the 
    public  static Connection getConnection () {
         the try {
             return dataSource.getConnection ();
        } The catch (SQLException E) {
            the throw  new new a RuntimeException ( "connection failed" + E);
        }
    }
    // define a method can be returned to the pool 
    public  static the DataSource GetDataSource () {
         return the dataSource;
    }
    // 4 define a method for releasing resources 
    public  static  void Close (the ResultSet RES, the Statement State, Conn Connection) {
         IF (RES! = Null ) {
             the try {
                res.close();
            } catch (SQLException e) {
                e.printStackTrace ();
            }
        }
        if(state!=null){
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace ();
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace ();
            }
        }
    }
}