package com.wbytts.util;

import java.io.IOException;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

import java.util.Properties;

public class JDBCUtils {

    static String driverClass = null;

    static String url = null;

    static String name = null;

    static String password = null;

    static {

        try {

            //建立一個(gè)屬性配置對象

            Properties properties = new Properties();

            //使用類加載器，去獲取src底下的文件，要自己創(chuàng)建jdbc.properties配置文件

            InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("jdbc.properties");

                //Thread.currentThread().getContextClassLoader().getResourceAsStream("jdbc.properties");

            //導(dǎo)入輸入流

            properties.load(is);

            //讀取屬性

            driverClass = properties.getProperty("driverClass");

            url = properties.getProperty("url");

            name = properties.getProperty("name");

            password = properties.getProperty("password");

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public static Connection getConnection() {

        Connection conn = null;

        try {

            Class.forName(driverClass);

            conn = DriverManager.getConnection(url, name, password);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return conn;

    }

    /**

     *  釋放資源

     * @param conn

     * @param st

     * @param rs

     */

    public static void release(Connection conn, Statement st, ResultSet rs) {

        closeRs(rs);

        closeSt(st);

        closeConn(conn);

    }

    public static void release(Connection  conn, Statement st) {

        closeSt(st);

        closeConn(conn);

    }

    private static void closeRs(ResultSet rs) {

        try {

            if(rs != null) {

                rs.close();

            }

            rs = null;

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            rs = null;

        }

    }

    private static void closeSt(Statement st) {

        try {

            if(st != null) {

                st.close();

            }

            st = null;

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            st = null;

        }

    }

    private static void closeConn(Connection conn) {

        try {

            if(conn != null) {

                conn.close();

            }

            conn = null;

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            conn = null;

        }

    }

}

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