在 MySQL/MariaDB 中创建过程并定义变量导致错误 #1064答案

【问题标题】：Create Procedure in MySQL/MariaDB and define variable causes error #1064在 MySQL/MariaDB 中创建过程并定义变量导致错误 #1064
【发布时间】：2019-09-22 20:10:58
【问题描述】：

我正在尝试在 mysql/mariadb 中创建一个带有声明变量的 SP - 但我不明白，它有什么问题！？！

DROP PROCEDURE IF EXISTS UpdateReceiverDevice;
DELIMITER $$

CREATE PROCEDURE `UpdateReceiverDevice`(IN `deviceIdentifier` VARCHAR(45), IN `deviceName` VARCHAR(45), IN `deviceLocation` VARCHAR(45), IN `informations` TEXT) NOT DETERMINISTIC MODIFIES SQL DATA SQL SECURITY DEFINER
BEGIN
    DECLARE receiverDeviceId AS INT(11) DEFAULT 0
    SET receiverDeviceId = (SELECT ID FROM ReceiverDevice WHERE DeviceIdentifier = deviceIdentifier);
    IF (receiverDeviceId > 0) BEGIN
        UPDATE ReceiverDevice SET Informations = informations WHERE ID = receiverDeviceId;
    ELSE
        INSERT INTO ReceiverDevice (DeviceName, DeviceLocation, DeviceIdentifier, Informations) VALUES(deviceName, deviceLocation, deviceIdentifier, informations);
    END IF
END $$

DELIMITER ;

MySQL 正在返回此错误：

Ein oder mehrere Fehler sind aufgetreten während Ihre Anfrage verarbeitet wurde: Die folgende Abfrage ist fehlgeschlagen: "CREATE PROCEDURE UpdateReceiverDevice(IN deviceIdentifier VARCHAR(45), IN deviceName VARCHAR(45), IN deviceLocation VARCHAR(45), IN informations TEXT) 非确定性修改 SQL DATA SQL SECURITY DEFINER DECLARE receiverDeviceId AS INT(11) SET receiverDeviceId = (SELECT ID FROM ReceiverDevice WHERE DeviceIdentifier = deviceIdentifier) IF receiverDeviceId > 0 UPDATE ReceiverDevice SET Informations = informations WHERE ID = @receiverDeviceId ELSE INSERT INTO ReceiverDevice (DeviceName, DeviceLocation, DeviceIdentifier,信息) VALUES(deviceName, deviceLocation, deviceIdentifier, informations) END IF"

MySQL 融合：#1064 - der SQL 语法中的 Fehler。 Bitte die korrekte Syntax im Handbuch nachschlagen bei 'DECLARE receiverDeviceId AS INT(11) SET receiverDeviceId = (SELECT ID FROM Re' in Zeile 1

这是我的服务器：

服务器类型：MariaDB
服务器版本：10.3.11-MariaDB-1:10.3.11+maria~bionic - mariadb.org 二进制分发
Protokoll 版本：10
服务器-Zeichensatz：UTF-8 Unicode (utf8)

【问题讨论】：

每个语句都需要终止。包括声明和结束 ifs
BEGINs 发生了什么？

标签： mysql stored-procedures mariadb

【解决方案1】：

cmets 中的“每条语句都需要终止”的提示非常有帮助。

DROP PROCEDURE IF EXISTS UpdateReceiverDevice;
DELIMITER $$

CREATE PROCEDURE `UpdateReceiverDevice`(IN `deviceIdentifier` VARCHAR(45), IN `deviceName` VARCHAR(45), IN `deviceLocation` VARCHAR(45), IN `informations` TEXT) NOT DETERMINISTIC MODIFIES SQL DATA SQL SECURITY DEFINER 
BEGIN
    DECLARE receiverDeviceId INT(11) DEFAULT 0;
    SELECT ID INTO receiverDeviceId FROM ReceiverDevice WHERE DeviceIdentifier = deviceIdentifier;

    IF receiverDeviceId > 0 THEN
        UPDATE ReceiverDevice SET Informations = informations WHERE ID = receiverDeviceId;
    ELSE
        INSERT INTO ReceiverDevice (DeviceName, DeviceLocation, DeviceIdentifier, Informations) VALUES(deviceName, deviceLocation, deviceIdentifier, informations);
    END IF;
END $$

DELIMITER ;

【讨论】：