SQLValue 构造函数

 CONSTRUCTOR(
	oHyperLabel,
	oFieldSpec,
	nODBCType,
	nScale,
	lNullable
) CLIPPER

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