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| SET @column_exists := (
| SELECT COUNT(1)
| FROM information_schema.COLUMNS
| WHERE TABLE_SCHEMA = DATABASE()
| AND TABLE_NAME = 't_site'
| AND COLUMN_NAME = 'venue_partner_id'
| );
|
| SET @ddl := IF(
| @column_exists = 0,
| 'ALTER TABLE `t_site` ADD COLUMN `venue_partner_id` int NULL DEFAULT NULL COMMENT ''场地方合作商ID'' AFTER `partner_id`',
| 'SELECT 1'
| );
|
| PREPARE stmt FROM @ddl;
| EXECUTE stmt;
| DEALLOCATE PREPARE stmt;
|
|
