-- 为车辆里程统计表添加分段数量字段
|
-- 用途：记录当日关联的GPS分段数量，用于数据完整性校验和业务监控
|
|
USE `ry-vue`;
|
|
-- 检查字段是否存在，如果不存在则添加
|
SET @dbname = DATABASE();
|
SET @tablename = 'tb_vehicle_mileage_stats';
|
SET @columnname = 'segment_count';
|
SET @preparedStatement = (SELECT IF(
|
(
|
SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
|
WHERE
|
(TABLE_SCHEMA = @dbname)
|
AND (TABLE_NAME = @tablename)
|
AND (COLUMN_NAME = @columnname)
|
) > 0,
|
'SELECT 1',
|
CONCAT('ALTER TABLE ', @tablename, ' ADD COLUMN `segment_count` int(11) DEFAULT 0 COMMENT ''关联的分段数量'' AFTER `task_count`;')
|
));
|
PREPARE alterIfNotExists FROM @preparedStatement;
|
EXECUTE alterIfNotExists;
|
DEALLOCATE PREPARE alterIfNotExists;
|
|
-- 验证字段是否添加成功
|
DESC tb_vehicle_mileage_stats;
|
