-- 为车辆里程统计表添加分段数量字段
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-- 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
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-- USE `ry-vue`;
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-- 检查字段是否存在，如果不存在则添加
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SET @dbname = DATABASE();
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SET @tablename = 'tb_vehicle_mileage_stats';
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SET @columnname = 'segment_count';
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SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
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WHERE
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(TABLE_SCHEMA = @dbname)
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AND (TABLE_NAME = @tablename)
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AND (COLUMN_NAME = @columnname)
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) > 0,
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'SELECT 1',
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CONCAT('ALTER TABLE ', @tablename, ' ADD COLUMN `segment_count` int(11) DEFAULT 0 COMMENT ''关联的分段数量'' AFTER `task_count`;')
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));
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PREPARE alterIfNotExists FROM @preparedStatement;
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EXECUTE alterIfNotExists;
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DEALLOCATE PREPARE alterIfNotExists;
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-- 验证字段是否添加成功
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DESC tb_vehicle_mileage_stats;
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|
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alter table tb_vehicle_mileage_stats add column segment_count int(11) default 0 comment '关联的分段数量' after task_count;
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