MQL4参考 
标准常量，列举和架构 交易常数 历史数据库属性
History Database Properties
When accessing timeseries the SeriesInfoInteger() function is used for obtaining additional symbol information. Identifier of a required property is passed as the function parameter. The identifier can be one of values of ENUM_SERIES_INFO_INTEGER.
ENUM_SERIES_INFO_INTEGER
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SERIES_BARS_COUNT
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Bars count for the symbol-period for the current moment
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long
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SERIES_FIRSTDATE
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The very first date for the symbol-period for the current moment
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datetime
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SERIES_LASTBAR_DATE
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Open time of the last bar of the symbol-period
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datetime
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SERIES_SERVER_FIRSTDATE
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The very first date in the history of the symbol on the server regardless of the timeframe
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datetime
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