接受具有多个参数的字符串的 MySQL 存储过程

Question

我想创建一个存储过程，它接受 IN 参数中的所有值作为单个字符串。

DELETE FROM object 
WHERE Type NOT IN 
    ('ListGrid',
     'TextField',
     'SpinBox',
     'MenuButton',
     'ListGrid',
     'RadioButton',
     'DropDown',
     'PopUp',
     'Element',
     'Checkbox',
     'TreeDropDown',
     'TblColumn',
     'Button',
     'Link',
     'Filter',
     'TblRow',
     'GridRow',
     'Popup')

这是我尝试过的一个示例，但它不起作用。

DELIMITER //
CREATE PROCEDURE deleteObjectTypes(IN p_type VARCHAR(255))
BEGIN
SET @query = CONCAT ('DELETE FROM object WHERE Type NOT IN (',p_type,')');
PREPARE stmt FROM @query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END //
DELIMITER ;

我收到以下错误：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''List)' at line 1

运行此查询时：

CALL deleteObjectTypes("'ListGrid1','TextField1','SpinBox1','MenuButton1','ListGrid2','TextField2','SpinBox2','MenuButton2','ListGrid3','TextField3','SpinBox3','MenuButton3','ListGrid4','TextField4','SpinBox4','MenuButton4','ListGrid5','TextField5','SpinBox5','MenuButton5','ListGrid6','TextField6','SpinBox6','MenuButton6'")

Answer 1

您需要将 VARCHAR 大小更改为其最大值（或较低的有效值）。

DELIMITER //
CREATE PROCEDURE deleteObjectTypes(IN p_type VARCHAR(65535))
BEGIN
    SET @query = CONCAT ('DELETE FROM object WHERE Type NOT IN (',p_type,')');
    PREPARE stmt FROM @query;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END //
DELIMITER ;

但是，请注意，如果您使用多字节字符集，则限制会更低：

VARCHAR(21844) CHARACTER SET utf8

如here所见。

Answer 2

（对不起，我无法添加 cmets 太低的声誉） 您的程序看起来不错，也许问题出在其他地方？请注意，我们已将 varchar 定义为 255 个字符，而您提供的示例超过了这个数字（291 个字符）

Answer 3

你应该试试这个（缩短的例子）：

DELETE 
FROM 
  object 
WHERE 
  NOT FIND_IN_SET( Type, 'ListGrid,TextField,SpinBox,MenuButton,ListGrid' );

和存储过程

DELIMITER //
CREATE PROCEDURE deleteObjectTypes(IN p_type VARCHAR(255))
BEGIN
  DELETE 
  FROM 
    object 
  WHERE 
    NOT FIND_IN_SET( Type, p_type );
END //
DELIMITER ;

---

CALL deleteObjectTypes( 'ListGrid1,TextField1,SpinBox1,MenuButton1,ListGrid2,TextField2,SpinBox2,MenuButton2,ListGrid3,TextField3,SpinBox3,MenuButton3,ListGrid4,TextField4,SpinBox4,MenuButton4,ListGrid5,TextField5,SpinBox5,MenuButton5,ListGrid6,TextField6,SpinBox6,MenuButton6' );