#!/usr/bin/env python
# -*- coding:utf-8 -*-
# author:SunXiuWen
# make_time:2019/1/13
import logging
import sys
from time import sleep

sys.path.append("..")
import pymysql
# 无法加载DButils包
from DBUtils.PooledDB import PooledDB

# from dbutils.pooled_db import PooledDB

"""
@功能：创建数据库连接池
"""


class DB(object):
    """docstring for DbConnection"""
    __pool = None

    def __init__(self, db_ip, db_port, db_name, db_user, db_password):
        self.db_ip = db_ip
        self.db_port = db_port
        self.db_name = db_name
        self.db_user = db_user
        self.db_password = db_password
        self.pool = self.__get_conn_pool()

    # 获取连接
    def __get_conn_pool(self):
        if self.__pool is None:
            try:
                self.__pool = PooledDB(creator=pymysql, host=self.db_ip, port=self.db_port,
                                       user=self.db_user, passwd=self.db_password,
                                       db=self.db_name, use_unicode=True, charset='utf8')
            except Exception as e:
                logging.error("%s : %s" % (Exception, e))
        return self.__pool

    # 获取连接
    def _get_connection(self):
        try:
            conn = self.pool.connection()
            cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
            return conn, cursor
        except Exception as e:
            logging.error(" db.pool.connection ERROR: %s" % e)
            return None, None

    # 关闭连接
    def _close_connection(self, conn, cursor):
        if cursor:
            cursor.close()
        if conn:
            conn.close()

    # 查询
    def query_all_sql(self, sql, param=None):
        conn, cursor = self._get_connection()
        try:
            cursor.execute(sql, param)
            result = cursor.fetchall()
            self._close_connection(conn, cursor)
        except Exception as e:
            self._close_connection(conn, cursor)
            logging.error(str(e))
            result = None
        return result

    def query_one_sql(self, sql, param=None):
        conn, cursor = self._get_connection()
        try:
            cursor.execute(sql, param)
            result = cursor.fetchone()
            self._close_connection(conn, cursor)
        except Exception as e:
            self._close_connection(conn, cursor)
            logging.error(str(e))
            result = None
        return result

    # 执行
    def execute_sql(self, sql, param=None):
        conn, cursor = self._get_connection()
        try:
            result = cursor.execute(sql, param)
            conn.commit()
            self._close_connection(conn, cursor)
        except Exception as e:
            conn.rollback()
            self._close_connection(conn, cursor)
            logging.error(str(e))
            result = None
        return result


# class MySqLHelper(object):
#     def __init__(self, db_ip, db_port, db_name, db_user, db_password):
#         self.db = MyConnectionPool(db_ip, db_port, db_name, db_user, db_password)  # 从数据池中获取连接
#
#     # def __new__(cls, *args, **kwargs):
#     #     if not hasattr(cls, 'inst'):  # 单例
#     #         cls.inst = super(MySqLHelper, cls).__new__(cls, *args, **kwargs)
#     #     return cls.inst
#
#     # 封装执行命令
#     def execute(self, sql, param=None, autoclose=False):
#         """
#         【主要判断是否有参数和是否执行完就释放连接】
#         :param sql: 字符串类型，sql语句
#         :param param: sql语句中要替换的参数"select %s from tab where id=%s" 其中的%s就是参数
#         :param autoclose: 是否关闭连接
#         :return: 返回连接conn和游标cursor
#         """
#         cursor, conn = self.db.getconn()  # 从连接池获取连接
#         count = 0
#         try:
#             # count : 为改变的数据条数
#             if param:
#                 count = cursor.execute(sql, param)
#             else:
#                 count = cursor.execute(sql)
#             conn.commit()
#             if autoclose:
#                 self.close(cursor, conn)
#         except Exception as e:
#             print("db error_msg:", e.args)
#         return cursor, conn, count
#
#     # 释放连接
#     def close(self, cursor, conn):
#         """释放连接归还给连接池"""
#         cursor.close()
#         conn.close()
#
#     # 查询所有
#     def selectall(self, sql, param=None):
#         try:
#             cursor, conn, count = self.execute(sql, param)
#             res = cursor.fetchall()
#             return res
#         except Exception as e:
#             print("db error_msg:", e.args)
#             self.close(cursor, conn)
#             return count
#
#     # 查询单条
#     def selectone(self, sql, param=None):
#         try:
#             cursor, conn, count = self.execute(sql, param)
#             res = cursor.fetchone()
#             self.close(cursor, conn)
#             return res
#         except Exception as e:
#             print("db error_msg:", e.args)
#             self.close(cursor, conn)
#             return count
#
#     # 增加
#     def insertone(self, sql, param):
#         try:
#             cursor, conn, count = self.execute(sql, param)
#             conn.commit()
#             self.close(cursor, conn)
#             return count
#         except Exception as e:
#             print("db error_msg:", e.args)
#             conn.rollback()
#             self.close(cursor, conn)
#             return count
#
#     # 删除
#     def delete(self, sql, param=None):
#         try:
#             cursor, conn, count = self.execute(sql, param)
#             conn.commit()
#             self.close(cursor, conn)
#             return count
#         except Exception as e:
#             print("db error_msg:", e.args)
#             conn.rollback()
#             self.close(cursor, conn)
#             return count
#
#     # 修改
#     def update(self, sql, param=None):
#         try:
#             cursor, conn, count = self.execute(sql, param)
#             conn.commit()
#             self.close(cursor, conn)
#             return count
#         except Exception as e:
#             print("db error_msg:", e.args)
#             conn.rollback()
#             self.close(cursor, conn)
#             return count
#

if __name__ == '__main__':
    db = DB()
    # while True:
    #     sql1 = 'select * from space where unit=%s'
    #     args = '11'
    #     ret = db.query_sql(sql=sql1,param=args)
    #     print(ret)  # (79, 2, 1, 2.2, None, 2, 1)
    # 查询单条
    sql1 = 'select * from space where unit=%s'
    args = '11'
    ret = db.query_one_sql(sql=sql1, param=args)
    print(ret)  # (79, 2, 1, 2.2, None, 2, 1)
    # 查询所有
    sql2 = "select * from space"
    ret = db.query_all_sql(sql=sql2)
    print(ret)
    # 增加
    sql3 = 'insert into test VALUES (%s,%s,%s,%s)'
    ret = db.execute_sql(sql3, ('鄂A6X3B0', 'DASDASDEFDFSDASDADASDAS', 1, 2))
    print(ret)
    # 删除
    sql4 = 'delete from test WHERE car=%s'
    args = '鄂A6X3B0'
    ret = db.execute_sql(sql4, args)
    print(ret)
    sleep(0.1)
    # 修改
    sql5 = 'update test set ki=%s WHERE car=%s'
    args = ('100', 'wkk')
    ret = db.update_sql(sql5, args)
    print(ret)