gudusoft.gsqlparser.util

Class TNiladicFunctionUtil

Object

gudusoft.gsqlparser.util.TNiladicFunctionUtil

public class TNiladicFunctionUtil
extends Object

Utility class for checking niladic functions (built-in functions without parentheses). Niladic functions are functions that can be called without parentheses and look like column references but are actually function calls returning values. Examples: - SQL Server: CURRENT_USER, SYSTEM_USER, CURRENT_TIMESTAMP - BigQuery: CURRENT_DATE, CURRENT_DATETIME, CURRENT_TIME - PostgreSQL: CURRENT_DATE, CURRENT_USER, LOCALTIME The function list is loaded from: /gudusoft/gsqlparser/builtinFunctions/niladicFunctions.properties

Constructor Summary

Constructors

Constructor and Description
TNiladicFunctionUtil()

Method Summary

Modifier and Type	Method and Description
static Set<String>	getNiladicFunctions(EDbVendor vendor) Get all niladic functions for a vendor.
static boolean	isNiladicFunction(EDbVendor vendor, String functionName) Check if a name is a niladic function for the given database vendor.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TNiladicFunctionUtil

public TNiladicFunctionUtil()

Method Detail

isNiladicFunction

public static boolean isNiladicFunction(EDbVendor vendor,
                                        String functionName)

Check if a name is a niladic function for the given database vendor.

Parameters:

vendor - The database vendor

functionName - The function name to check (case-insensitive)

Returns:

true if it's a known niladic function for this vendor

getNiladicFunctions

public static Set<String> getNiladicFunctions(EDbVendor vendor)

Get all niladic functions for a vendor.

Parameters:

vendor - The database vendor

Returns:

Set of niladic function names (uppercase), or empty set if none