七 mysql连接池

本文介绍了一种利用连接池管理数据库连接的方法,并提供了一个具体的Python实现案例,包括获取数据库连接和执行SQL语句的过程。

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数据保存到数据库中,当然少不了获取连接及执行sql
使用连接池,获取连接

@classmethod
    def getConnection(cls):
        '''
        @return: 返回一个数据库连接的实例
        '''
        logger = logging.getLogger('myLogger.myutil.Myutil')

        try:
            if MyUtil.cnxpool is None:
                user = MyUtil.loadProperty('mysql', 'user')
                passwd = MyUtil.loadProperty('mysql', 'password')
                host = MyUtil.loadProperty('mysql', 'host')
                db = MyUtil.loadProperty('mysql', 'database')

                dbconfig = {
                    "database":db,
                    "user":user,
                    "password":passwd,
                    "host":host,
                    "charset":"utf8"
                }
                MyUtil.cnxpool = mysql.connector.pooling.MySQLConnectionPool(pool_name="mypool",  pool_size=10, **dbconfig)

        except mysql.connector.Error as err:
            MyUtil.cnxpool = None
            if err.errno == errorcode.ER_ACCESS_DENIED_ERROR:
                logger.info("用户名或密码不对")
            elif err.errno == errorcode.ER_BAD_DB_ERROR:
                logger.info("数据库不存在")
            else:
                logger.debug(err)

            raise Exception('Can\'t connect to MySQL server')

        return MyUtil.cnxpool.get_connection()

执行sql

def store2DB(self, sql, values):
        '''
        保存需求到表中
        @param sql: 需要执行的sql
        @param values: 元组类型,字段的值
        @return: 执行结果, True or False
        '''        
        # get connection
        cnx = MyUtil.getConnection()
        # get cursor
        cursor = cnx.cursor()

        try:
            # execute sql
            cursor.execute(sql, values)
            res = True

            self.logger.info('add view  success')
        except Exception, e:
            self.logger.debug(e)
            res = False
        else:
            # commit
            cnx.commit()
            # close resources
            cursor.close()
            MyUtil.closeConn(cnx)

        return res

参考文章:mysql 连接池

Rebuild started: Project: Project *** Using Compiler 'V6.22', folder: 'E:\Keil_v5\ARM\ARMCLANG\Bin' Rebuild target 'Target 1' assembling startup_stm32f10x_md.s... Start/core_cm3.c(445): error: non-ASM statement in naked function is not supported 445 | uint32_t result=0; | ^ Start/core_cm3.c(442): note: attribute is here 442 | uint32_t __get_PSP(void) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(465): error: parameter references not allowed in naked functions 465 | "BX lr \n\t" : : "r" (topOfProcStack) ); | ^ Start/core_cm3.c(461): note: attribute is here 461 | void __set_PSP(uint32_t topOfProcStack) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(479): error: non-ASM statement in naked function is not supported 479 | uint32_t result=0; | ^ Start/core_cm3.c(476): note: attribute is here 476 | uint32_t __get_MSP(void) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(499): error: parameter references not allowed in naked functions 499 | "BX lr \n\t" : : "r" (topOfMainStack) ); | ^ Start/core_cm3.c(495): note: attribute is here 495 | void __set_MSP(uint32_t topOfMainStack) __attribute__( ( naked ) ); | ^ 4 errors generated. compiling core_cm3.c... compiling misc.c... compiling system_stm32f10x.c... compiling stm32f10x_adc.c... compiling stm32f10x_dac.c... compiling stm32f10x_exti.c... compiling stm32f10x_dbgmcu.c... compiling stm32f10x_dma.c... compiling stm32f10x_crc.c... compiling stm32f10x_cec.c... compiling stm32f10x_bkp.c... compiling stm32f10x_can.c... compiling stm32f10x_flash.c... compiling stm32f10x_pwr.c... compiling stm32f10x_fsmc.c... compiling stm32f10x_
03-31
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