我的MySQL的函數不插入值

這是我的代碼：我的MySQL的函數不插入值

IF EXISTS(SELECT * FROM User WHERE Username = @Username) THEN 
    RETURN -1; 
ELSEIF EXISTS(SELECT * FROM User WHERE Email = @Email) 
THEN 
    RETURN -2; 
ELSE 
    INSERT INTO User(Username, Password, Email) 
    VALUES ('Nicki',@Password,@Email); 
    RETURN LAST_INSERT_ID(); 
END IF

和圖像

Image from Function

但功能不插入值 - 你能解釋一下爲什麼不？

來源

2017-05-24 N1ck1

你已經有一個叫Nicki的用戶嗎？您正在將「Nicki」硬編碼到插入中，而不是像我期望的那樣使用@Username。如果你已經有一個用戶名Nicki，並且該字段是唯一/主鍵等，它將失敗。如果不是這種情況，請自己運行兩個'SELECT'語句（'SELECT * FROM用戶WHERE用戶名= @用戶名'和電子郵件地址相同），並指定用戶名和電子郵件地址。檢查他們是否返回值 –

您返回的值是什麼？ –

嘿好吧謝謝，但我沒有任何價值在我的Tabel。她是我的結構：https：//pastebin.com/kZ0zaxD4 – N1ck1

@Username是9.4 User-Defined Variables而Username是表列。另外，檢查：C.1 Restrictions on Stored Programs::Name Conflicts within Stored Routines。

嘗試：

mysql> SELECT VERSION(); 
+-----------+ 
| VERSION() | 
+-----------+ 
| 5.7.18 | 
+-----------+ 
1 row in set (0.00 sec) 

mysql> DROP FUNCTION IF EXISTS `InsertUser`; 
Query OK, 0 rows affected (0.00 sec) 

mysql> DROP TABLE IF EXISTS `User`; 
Query OK, 0 rows affected (0.01 sec) 

mysql> CREATE TABLE IF NOT EXISTS `User`(
    -> `Id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
    -> `Username` VARCHAR(255) NOT NULL, 
    -> `Password` VARCHAR(255) NOT NULL, 
    -> `Email` VARCHAR(255) NOT NULL 
    ->); 
Query OK, 0 rows affected (0.00 sec) 

mysql> DELIMITER // 

mysql> CREATE FUNCTION `InsertUser`(`_Username` VARCHAR(255), 
    ->        `_Email` VARCHAR(255), 
    ->        `_Password` VARCHAR(255) 
    ->) 
    -> RETURNS INT 
    -> LANGUAGE SQL 
    -> DETERMINISTIC 
    -> MODIFIES SQL DATA 
    -> BEGIN 
    -> IF EXISTS(SELECT * FROM `User` WHERE `Username` = `_Username`) THEN 
    ->  RETURN -1; 
    -> ELSEIF EXISTS(SELECT * FROM `User` WHERE `Email` = `_Email`) THEN 
    ->  RETURN -2; 
    -> ELSE 
    ->  INSERT INTO `User` (`Username`, `Password`, `Email`) 
    ->  VALUES ('Nicki', `_Password`, `_Email`); 
    ->  RETURN LAST_INSERT_ID(); 
    -> END IF; 
    -> END// 
Query OK, 0 rows affected (0.00 sec) 

mysql> DELIMITER ; 

mysql> SELECT 
    -> `Id`, 
    -> `Username`, 
    -> `Password`, 
    -> `Email` 
    -> FROM 
    -> `User`; 
Empty set (0.00 sec) 

mysql> SELECT `InsertUser`(NULL, 'pass', '[email protected]'); 
+------------------------------------------------+ 
| `InsertUser`(NULL, 'pass', '[email protected]') | 
+------------------------------------------------+ 
|            1 | 
+------------------------------------------------+ 
1 row in set (0.01 sec) 

mysql> SELECT 
    -> `Id`, 
    -> `Username`, 
    -> `Password`, 
    -> `Email` 
    -> FROM 
    -> `User`; 
+----+----------+------------------+-------+ 
| Id | Username | Password   | Email | 
+----+----------+------------------+-------+ 
| 1 | Nicki | [email protected] | pass | 
+----+----------+------------------+-------+ 
1 row in set (0.00 sec) 

mysql> SELECT `InsertUser`(NULL, 'pass', '[email protected]'); 
+------------------------------------------------+ 
| `InsertUser`(NULL, 'pass', '[email protected]') | 
+------------------------------------------------+ 
|            -2 | 
+------------------------------------------------+ 
1 row in set (0.00 sec)

例db-fiddle。

來源

2017-05-24 15:39:35 wchiquito

噢，我的良好...謝謝... It正在工作:) – N1ck1

我的MySQL的函數不插入值

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