DbColumnInfo 构造函数 (String, String, Int32, Int32, Int32)

 CONSTRUCTOR(
	sName AS STRING,
	sType AS STRING,
	nLength AS LONG,
	nDecimals AS LONG,
	nOffSet AS LONG := -1
)

public DbColumnInfo(
	string sName,
	string sType,
	int nLength,
	int nDecimals,
	int nOffSet = -1
)