[英]In mySQL, how do I get and set a value in one query?
我試圖獲取表中最高的“行序號”,將其設置為變量,將其遞增,然后將其與新數據一起作為新記錄插入。 該腳本使用PHP,$ SQL用於mySQL
$SQL="
BEGIN
DECLARE lineOrder INT DEFAULT 1;
SET lineOrder = (
SELECT IFNULL(`Line Order`,1)
FROM `router`
ORDER BY `Line Order` DESC
lIMIT 1);
lineOrder = lineOrder + 1;
INSERT INTO `router`(`Line Order`, `Estimated Time`,
`Estimated Time Unit`, `Work Center`,
`Work Description`)
VALUES (lineOrder,?,?,?,?);
END;
";
$stmt = $GLOBALS['mySQLConnection']->prepare($SQL);
echo $GLOBALS['mySQLConnection']->error;
這是錯誤:SQL語法有錯誤; 檢查與您的MySQL服務器版本相對應的手冊以獲取正確的語法,以在第2行的'SET lineOrder =(SELECT IFNULL( Line Order
,1)FROM router
'附近使用
INSERT INTO `router` (`Line Order`,
`Estimated Time`, `Estimated Time Unit`, `Work Center`, `Work Description`)
SELECT 1 + IFNULL(MAX(`Line Order`), 0),
?, ?, ?, ?
FROM `router`
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