Question

我想设置一个触发器，以便在更新时'SyncStatus'= 1，然后触发器将更新'SyncStatusTimestamp'= Current_Time_Stamp。

但是我在说错误：

错误：

无法在存储的函数/触发器中更新表'bloodpressurebattery' 因为它已被调用此存储的语句使用功能/触发

-----------表格详情-------------

CREATE TABLE `bloodpressurebattery` (
    `BloodPressureBatteryID` INT(11) NOT NULL AUTO_INCREMENT,
    `ByDevSessionId` INT(11) NOT NULL,
    `ByPatientId` INT(11) NULL DEFAULT NULL,
    `ByDeviceId` INT(11) NULL DEFAULT NULL,
    `Value` FLOAT NULL DEFAULT NULL,
    `SequenceId` INT(11) NULL DEFAULT NULL,
    `SyncStatus` INT(11) NULL DEFAULT '0',
    `Timestamp` TIMESTAMP(3) NULL DEFAULT NULL,
    `WrittenToAndroidDatabaseTimestamp` TIMESTAMP(3) NULL DEFAULT NULL,
    `WrittenToServerDatabaseTimestamp6` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    `SyncStatusTimestamp` TIMESTAMP(3) NULL DEFAULT '1970-01-01 00:00:01.000',
    PRIMARY KEY (`BloodPressureBatteryID`),
    INDEX `ByDevSessionId` (`ByDevSessionId`),
    CONSTRAINT `bloodpressurebattery_ibfk_1` FOREIGN KEY (`ByDevSessionId`) REFERENCES `devicesession` (`DeviceSessionID`) ON UPDATE CASCADE
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=524874
;

----触发细节----------------------

DELIMITER //

    CREATE TRIGGER SyncStatusTimestamp_bloodpressurebattery_after_update
    AFTER UPDATE
       ON bloodpressurebattery FOR EACH ROW

    BEGIN

    DECLARE _SyncStatusTimestamp INT ; 
    DECLARE _BloodPressureBatteryID INT  ;


     SET _BloodPressureBatteryID = (SELECT bloodpressurebattery.BloodPressureBatteryID As _BloodPressureBatteryID
                    FROM  bloodpressurebattery                     
                    WHERE BloodPressureBatteryID =  new.BloodPressureBatteryID  AND SyncStatus = 1);                                            

      IF _BloodPressureBatteryID > 0 THEN

       UPDATE bloodpressurebattery SET SyncStatusTimestamp = CURRENT_TIMESTAMP  AND bloodpressurebattery.BloodPressureBatteryID = _BloodPressureBatteryID ;

      END IF  ;

     END

Answer 1

您收到该错误导致MySQL不支持递归触发器。您在bloodpressurebattery表和UPDATE上定义了一个装配工，您再次尝试通过以下DML语句访问同一个表

UPDATE bloodpressurebattery SET SyncStatusTimestamp = CURRENT_TIMESTAMP  .....

每MySQL Documentation

存储函数不能递归使用。

•在存储的函数或触发器中，不允许修改a   已经被使用（用于读或写）的表   调用函数或触发器的语句。

无法更新存储函数/触发器中的表，因为它已被MYSQL

1 个答案: