Package org.hibernate.query.sqm.function

Package defining support for HQL, including JPQL as a subset of HQL.

Concerns handled by subpackages include:

• query language transformation via ANTLR, and
• query execution via an instance of Query.

Translation of HQL to SQL involves the following steps:

• First, the ANTLR-generated tokenizer and parser work in series to parse the text of the query and produce an AST.
• Next, SemanticQueryBuilder translates the AST into an instance of the SQM (Semantic Query Model) defined in org.hibernate.query.sqm.
• Next, StandardSqmTranslator transforms the SQM tree and produces a SQL AST, an instance of the syntax tree defined by org.hibernate.sql.ast.tree.
• Finally, a SQL dialect-specific implementation of SqlAstTranslator produces an executable SQL statement.

See Also:

HqlTranslator, SqmQueryImplementor, NamedSqmQueryMemento

Interface Summary

Interface	Description
FunctionRenderingSupport	Support for SqmFunctionDescriptors that ultimately want to perform SQL rendering themselves.
SqmFunctionDescriptor	A factory for SQM nodes representing invocations of a certain named function.

Class Summary

Class	Description
AbstractSqmFunctionDescriptor
AbstractSqmSelfRenderingFunctionDescriptor
JdbcEscapeFunctionDescriptor	Acts as a wrapper to another SqmFunctionDescriptor, rendering the standard JDBC escape sequence {fn f(x, y)} around the invocation syntax generated by its delegate.
MultipatternSqmFunctionDescriptor	Support for overloaded functions defined in terms of a list of patterns, one for each possible function arity.
NamedSqmFunctionDescriptor	Provides a standard implementation that supports the majority of the HQL functions that are translated to SQL.
PatternBasedSqmFunctionDescriptor	Support for HQL functions that have different representations in different SQL dialects, where the difference can be handled via a pattern template.
SelfRenderingAggregateFunctionSqlAstExpression	Representation of an aggregate function call in the SQL AST for impls that know how to render themselves.
SelfRenderingFunctionSqlAstExpression	Representation of a function call in the SQL AST for impls that know how to render themselves.
SelfRenderingOrderedSetAggregateFunctionSqlAstExpression	Representation of an aggregate function call in the SQL AST for impls that know how to render themselves.
SelfRenderingSqmAggregateFunction<T>
SelfRenderingSqmFunction<T>
SelfRenderingSqmOrderedSetAggregateFunction<T>
SelfRenderingSqmWindowFunction<T>
SelfRenderingWindowFunctionSqlAstExpression	Representation of a window function call in the SQL AST for impls that know how to render themselves.
SqmFunctionRegistry	Defines a registry for SqmFunctionDescriptor instances.

Enum Summary

Enum	Description
FunctionKind	The kind of function e.g.