JDBC 工具类模板c3p0

JDBC 工具类模板

 package com.itheima.sh.utils;

 import com.mchange.v2.c3p0.ComboPooledDataSource;

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

 /*
  * jdbc工具类
  */
 public class JDBCUtils {
     //创建c3p0核心类对象
     private static ComboPooledDataSource cpds = new ComboPooledDataSource();
     // 定义一个静态方法对外提供连接
     public static Connection getConnection() {
         try {
             //从c3p0数据库连接池获取连接
             Connection conn = cpds.getConnection();
             return conn;
         } catch (Exception e) {
             throw new RuntimeException(e);
         }
     }
     //定义一个静态方法让外界获取数据库连接池对象
     public static DataSource getDataSource()
     {
         return cpds;
     }

     // 定义一个静态方法让外界关闭资源
     public static void release(Connection conn, Statement st, ResultSet rs) {
         try {
             // 关闭资源
             if (conn != null) {

                 conn.close();
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         try {
             // 关闭资源
             if (st != null) {
                 st.close();
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         try {
             // 关闭资源
             if (rs != null) {
                 rs.close();
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
 }