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執行語句程序
我試圖創建和使用此過程:串聯並在MySQL
delimiter //
CREATE PROCEDURE doiterate(p1 INT)
BEGIN
DECLARE str VARCHAR(5000);
label1: LOOP
SET @query = 'SELECT * FROM ';
IF p1 > 0 THEN
SET @query = CONCAT(@query, ' wp_', pl, '_options,');
ITERATE label1;
END IF;
LEAVE label1;
END LOOP label1;
SET @query = substring(@query,1,length(@query)-1);
SET @query = CONCAT(@query, ' WHERE option_name = \'template\'OR option_name = \'stylesheet\' OR option_name = \'current_theme\'');
PREPARE stmt FROM @query;
EXECUTE stmt;
END//
,當我執行它,我得到這個消息:
未知列「PL」在「字段列表'
任何人都可以指出我在哪裏做錯了?