Package org.hibernate.dialect.function

Class CurrentFunction

java.lang.Object

org.hibernate.query.sqm.function.AbstractSqmFunctionDescriptor

org.hibernate.query.sqm.function.AbstractSqmSelfRenderingFunctionDescriptor

org.hibernate.dialect.function.CurrentFunction

All Implemented Interfaces:

FunctionRenderer, SqmFunctionDescriptor

public class CurrentFunction
extends AbstractSqmSelfRenderingFunctionDescriptor

A "function" with no parameters that returns the current date, time, or timestamp. For example, current_date.

Constructor Summary

Constructors

Constructor	Description
CurrentFunction(String name, String sql, BasicType<?> type)

Method Summary

Modifier and Type	Method	Description
boolean	alwaysIncludesParentheses()	Will a call to the described function always include parentheses?
String	getArgumentListSignature()
void	render(SqlAppender sqlAppender, List<? extends SqlAstNode> arguments, ReturnableType<?> returnType, SqlAstTranslator<?> walker)

Methods inherited from class org.hibernate.query.sqm.function.AbstractSqmSelfRenderingFunctionDescriptor

generateSqmAggregateFunctionExpression, generateSqmFunctionExpression, generateSqmOrderedSetAggregateFunctionExpression, generateSqmWindowFunctionExpression, getFunctionKind

Methods inherited from class org.hibernate.query.sqm.function.AbstractSqmFunctionDescriptor

generateAggregateSqmExpression, generateOrderedSetAggregateSqmExpression, generateSqmExpression, generateWindowSqmExpression, getArgumentsValidator, getArgumentTypeResolver, getName, getReturnSignature, getReturnTypeResolver, getSignature

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hibernate.query.sqm.function.FunctionRenderer

render, render, render, render

Methods inherited from interface org.hibernate.query.sqm.function.SqmFunctionDescriptor

generateSqmExpression, generateSqmExpression, isPredicate

Constructor Details

CurrentFunction

public CurrentFunction(String name,
 String sql,
 BasicType<?> type)

Method Details

render

public void render(SqlAppender sqlAppender,
 List<? extends SqlAstNode> arguments,
 ReturnableType<?> returnType,
 SqlAstTranslator<?> walker)

Specified by:

render in interface FunctionRenderer

Overrides:

render in class AbstractSqmSelfRenderingFunctionDescriptor

getArgumentListSignature

public String getArgumentListSignature()

Overrides:

getArgumentListSignature in class AbstractSqmFunctionDescriptor

alwaysIncludesParentheses

public boolean alwaysIncludesParentheses()

Description copied from interface: SqmFunctionDescriptor

Will a call to the described function always include parentheses?

Instances of this interface are usually used for rendering of functions. However, there are cases where Hibernate needs to consume a fragment and decide if a token represents a function name. In cases where the token is followed by an opening parenthesis, we can safely assume the token is a function name. Bur if the next token is not an opening parenthesis, the token might still represent a function if the function has a "no paren" form in the case of no arguments.

For example, many databases do not require parentheses for functions like current_timestamp and friends. This method helps account for those cases.

Returns:

true by default