mirror of
https://github.com/perfect-panel/ppanel-web.git
synced 2026-08-29 05:52:08 -04:00
Ember Moth
22 lines
509 B
SQL
22 lines
509 B
SQL
-- 只有当 ads 表中不存在 description 字段时才添加
|
|
SET
|
|
@col_exists := (
|
|
SELECT COUNT(*)
|
|
FROM INFORMATION_SCHEMA.COLUMNS
|
|
WHERE TABLE_SCHEMA = DATABASE()
|
|
AND TABLE_NAME = 'ads'
|
|
AND COLUMN_NAME = 'description'
|
|
);
|
|
|
|
SET
|
|
@query := IF(
|
|
@col_exists = 0,
|
|
'ALTER TABLE `ads` ADD COLUMN `description` VARCHAR(255) DEFAULT '''' COMMENT ''Description'';',
|
|
'SELECT "Column `description` already exists"'
|
|
);
|
|
|
|
PREPARE stmt FROM @query;
|
|
EXECUTE stmt;
|
|
DEALLOCATE PREPARE stmt;
|
|
|