SQLColumn 构造函数

 CONSTRUCTOR(
	oHyperLabel,
	oFieldSpec,
	nODBCType,
	nScale,
	lNullable,
	nIndex,
	cColName,
	cAlias
) CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public SQLColumn(
	__Usual oHyperLabel = default,
	__Usual oFieldSpec = default,
	__Usual nODBCType = default,
	__Usual nScale = default,
	__Usual lNullable = default,
	__Usual nIndex = default,
	__Usual cColName = default,
	__Usual cAlias = default
)