public static XmlElement generateKeysSelective(List<IntrospectedColumn> columns, String prefix) {
        return generateKeysSelective(columns, prefix, true);
    }
public static XmlElement generateKeysSelective(List<IntrospectedColumn> columns, String prefix) {
        return generateKeysSelective(columns, prefix, true);
    }
public static XmlElement generateKeysSelective ( List < IntrospectedColumn > columns , String prefix ) { return generateKeysSelective ( columns , prefix , true ) ; }
生成keys Selective Ele
@param columns
@param prefix
@return
生成keys Selective Ele