Package org.hibernate.dialect.function

Class PostgreSQLTruncRoundFunction

java.lang.Object

org.hibernate.query.sqm.function.AbstractSqmFunctionDescriptor

org.hibernate.dialect.function.PostgreSQLTruncRoundFunction

All Implemented Interfaces:

FunctionRenderingSupport, SqmFunctionDescriptor

public class PostgreSQLTruncRoundFunction
extends AbstractSqmFunctionDescriptor
implements FunctionRenderingSupport

PostgreSQL only supports the two-argument trunc and round functions with the following signatures:

• trunc(numeric, integer)
• round(numeric, integer)

This custom function falls back to using floor as a workaround only when necessary, e.g. when there are 2 arguments to the function and either:

• The first argument is not of type numeric
or
• The dialect doesn't support the two-argument trunc function

See Also:

PostgreSQL documentation

Constructor Summary

Constructors

Constructor	Description
PostgreSQLTruncRoundFunction(String name, boolean supportsTwoArguments)

Method Summary

Modifier and Type	Method	Description
protected <T> SelfRenderingSqmFunction<T>	generateSqmFunctionExpression(List<? extends SqmTypedNode<?>> arguments, ReturnableType<T> impliedResultType, QueryEngine queryEngine)	Return an SQM node or subtree representing an invocation of this function with the given arguments.
String	getArgumentListSignature()
void	render(SqlAppender sqlAppender, List<? extends SqlAstNode> arguments, SqlAstTranslator<?> walker)

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

generateAggregateSqmExpression, generateOrderedSetAggregateSqmExpression, generateSqmAggregateFunctionExpression, generateSqmExpression, generateSqmOrderedSetAggregateFunctionExpression, generateSqmWindowFunctionExpression, 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.FunctionRenderingSupport

render, render, render

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

alwaysIncludesParentheses, generateSqmExpression, generateSqmExpression, getFunctionKind

Constructor Detail

PostgreSQLTruncRoundFunction

public PostgreSQLTruncRoundFunction(String name,
                                    boolean supportsTwoArguments)

Method Detail

render

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

Specified by:

render in interface FunctionRenderingSupport

getArgumentListSignature

public String getArgumentListSignature()

Overrides:

getArgumentListSignature in class AbstractSqmFunctionDescriptor

generateSqmFunctionExpression

protected <T> SelfRenderingSqmFunction<T> generateSqmFunctionExpression(List<? extends SqmTypedNode<?>> arguments,
                                                                        ReturnableType<T> impliedResultType,
                                                                        QueryEngine queryEngine)

Description copied from class: AbstractSqmFunctionDescriptor

Return an SQM node or subtree representing an invocation of this function with the given arguments. This method may be overridden in the case of function descriptors that wish to customize creation of the node.

Specified by:

generateSqmFunctionExpression in class AbstractSqmFunctionDescriptor

Parameters:

arguments - the arguments of the function invocation

impliedResultType - the function return type as inferred from its usage