StandardSQLFunction (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.dialect.function
Class StandardSQLFunction

java.lang.Object
  org.hibernate.dialect.function.StandardSQLFunction

All Implemented Interfaces:: SQLFunction

Direct Known Subclasses:: ClassicAvgFunction, ClassicCountFunction, ClassicSumFunction, ConditionalParenthesisFunction, StandardJDBCEscapeFunction

public class StandardSQLFunction
extends Object
implements SQLFunction

Provides a standard implementation that supports the majority of the HQL functions that are translated to SQL. The Dialect and its sub-classes use this class to provide details required for processing of the associated function.

Author:: David Channon

Constructor Summary

StandardSQLFunction(String name)
          Construct a standard SQL function definition with a variable return type; the actual return type will depend on the types to which the function is applied.

StandardSQLFunction(String name, Type type)
          Construct a standard SQL function definition with a static return type.

Method Summary

String getName()
          Function name accessor

Type getReturnType(Type columnType, Mapping mapping)
          The return type of the function. May be either a concrete type which is preset, or variable depending upon the type of the first function argument.

Type getType()
          Function static return type accessor.

boolean hasArguments()
          Does this function have any arguments?

boolean hasParenthesesIfNoArguments()
          If there are no arguments, are parens required?

String render(List args, SessionFactoryImplementor factory)
          Render the function call as SQL fragment.

String toString()


Methods inherited from class java.lang.Object

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

Constructor Detail