WebDataTable.Compute可以进行聚合函数的操作,如sum (),但是在进行DataTable遇到如标题的错误:无效的聚合函数 Sum ()和类型 String 的用法;原因是因为当前栏的数据类型是String,非数值型,所以报错了;- 不信你可以去数据库查看下该字段的类型;. 第一种: 直 … WebMar 30, 2024 · Public Member Functions. u_int64_t. bufferSize () const. void. seekToByteAbsolute (u_int64_t byteNumber, u_int64_t numBytesToStream=0) void. …
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