8

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例子，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'")
4

3 回答 3

14

您需要将 VARCHAR 大小更改为最大值（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

如此处所见。

于 2012-12-19T20:50:54.727 回答
2

（对不起，我不能添加评论太低的声誉）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）

于 2012-12-19T21:01:03.503 回答
1

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' );

并使用存储过程

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' );
于 2012-12-19T23:53:02.953 回答