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| -- 运维设备：设备数量
| SET @db := DATABASE();
|
| SET @sql := IF(
| (SELECT COUNT(*) FROM information_schema.COLUMNS
| WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'yw_device' AND COLUMN_NAME = 'device_num') = 0,
| 'ALTER TABLE `yw_device` ADD COLUMN `device_num` int NOT NULL DEFAULT 1 COMMENT ''设备数量'' AFTER `name`',
| 'SELECT 1'
| );
| PREPARE stmt FROM @sql;
| EXECUTE stmt;
| DEALLOCATE PREPARE stmt;
|
|
