# Functions
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返回true就表示不存在.
使用者可能要在前面封装一层.
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获取N个月前后的表名.
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根据时间戳获取格式华的日期.
获取今天所在的月份表名.
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多行记录带分页,并返回总行数.
获取多行记录.
多行记录带分页,并返回总行数.
一次性插入多条值.
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构造查询.
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添加系统函数统计影响函数.
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获取单行记录.
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拼接update的sql语句.
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# Constants
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