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Package org.hibernate.dialect.function

Class ExtractFunction

java.lang.Object
- org.hibernate.query.sqm.function.AbstractSqmFunctionDescriptor
- - org.hibernate.dialect.function.ExtractFunction

All Implemented Interfaces:
FunctionRenderer,FunctionRenderingSupport,SqmFunctionDescriptor
Direct Known Subclasses:
OracleExtractFunction
```
public classExtractFunctionextendsAbstractSqmFunctionDescriptorimplementsFunctionRenderer
```
ANSI SQL-inspiredextract() function, where the date/time fields are enumerated byTemporalUnit, and portability is achieved by delegating toDialect.extractPattern(TemporalUnit).

Constructor Summary
Constructors
Constructor Description
ExtractFunction(Dialect dialect,TypeConfiguration typeConfiguration)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected <T> SelfRenderingSqmFunction`	`generateSqmFunctionExpression(List<? extendsSqmTypedNode<?>> 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<? extendsSqlAstNode> sqlAstArguments,ReturnableType<?> returnType,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.FunctionRenderer
render,render,render,render

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
  - ExtractFunction
```
public ExtractFunction(Dialect dialect,TypeConfiguration typeConfiguration)
```
- Method Detail
  - render
```
public void render(SqlAppender sqlAppender,List<? extendsSqlAstNode> sqlAstArguments,ReturnableType<?> returnType,SqlAstTranslator<?> walker)
```
    Specified by:
    render in interface FunctionRenderer
    Specified by:
    render in interface FunctionRenderingSupport
  - generateSqmFunctionExpression
```
protected <T> SelfRenderingSqmFunction generateSqmFunctionExpression(List<? extendsSqmTypedNode<?>> 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
  - getArgumentListSignature
```
public String getArgumentListSignature()
```
    Overrides:
    getArgumentListSignature in class AbstractSqmFunctionDescriptor

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