SQLColumn 构造函数

 CONSTRUCTOR(
	oHyperLabel AS HyperLabel,
	oFieldSpec AS FieldSpec,
	oType AS Type,
	nScale AS SHORT,
	lNullable AS LOGIC,
	nIndex AS LONG,
	cColName AS STRING,
	cAlias AS STRING
)

public SQLColumn(
	HyperLabel oHyperLabel,
	FieldSpec oFieldSpec,
	Type oType,
	short nScale,
	bool lNullable,
	int nIndex,
	string cColName,
	string cAlias
)