SQLListColumns 构造函数

 CONSTRUCTOR(
	cQualifier,
	cOwner,
	cTableName,
	cColName,
	oSQLConnection
) CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public SQLListColumns(
	__Usual cQualifier = default,
	__Usual cOwner = default,
	__Usual cTableName = default,
	__Usual cColName = default,
	__Usual oSQLConnection = default
)