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ColumnResult::isNumberSigned — Check if signed type
Retrieve a table's column information, and is instantiated by the RowResult::getColumns() method.
本函数还未编写文档，仅有参数列表。
此函数没有参数。
TRUE if a given column as a signed type.
Example #1 mysql_xdevapi\ColumnResult::isNumberSigned() example
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