Package org.hibernate.dialect.function

Examples of org.hibernate.dialect.function.SQLFunction


   * @param functionName The name of the function to locate
   * @return The sql function.
   * @throws QueryException Indicates no matching sql functions could be found.
   */
  private SQLFunction requireSQLFunction(String functionName) {
    SQLFunction f = findSQLFunction( functionName );
    if ( f == null ) {
      throw new QueryException( "Unable to find SQL function: " + functionName );
    }
    return f;
  }
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   * @param first        The first argument expression.
   * @return the function return type given the function name and the first argument expression node.
   */
  public Type findFunctionReturnType(String functionName, AST first) {
    // locate the registered function by the given name
    SQLFunction sqlFunction = requireSQLFunction( functionName );

    // determine the type of the first argument...
    Type argumentType = null;
    if ( first != null ) {
      if ( "cast".equals(functionName) ) {
        argumentType = TypeFactory.heuristicType( first.getNextSibling().getText() );
      }
      else if ( first instanceof SqlNode ) {
        argumentType = ( (SqlNode) first ).getDataType();
      }
    }

    return sqlFunction.getReturnType( argumentType, sfi );
  }
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    }
  }

  protected void beginFunctionTemplate(AST m, AST i) {
    MethodNode methodNode = ( MethodNode ) m;
    SQLFunction template = methodNode.getSQLFunction();
    if ( template == null ) {
      // if template is null we just write the function out as it appears in the hql statement
      super.beginFunctionTemplate( m, i );
    }
    else {
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    }
  }

  protected void endFunctionTemplate(AST m) {
    MethodNode methodNode = ( MethodNode ) m;
    SQLFunction template = methodNode.getSQLFunction();
    if ( template == null ) {
      super.endFunctionTemplate( m );
    }
    else {
      // this function has a template -> restore output, apply the template and write the result out
      FunctionArguments functionArguments = ( FunctionArguments ) writer;   // TODO: Downcast to avoid using an interface?  Yuck.
      writer = ( SqlWriter ) outputStack.removeFirst();
      out( template.render( functionArguments.getArgs(), sessionFactory ) );
    }
  }
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    // checking for "(" is currently redundant because it is checked before getting here;
    // doing the check anyhow, in case that earlier check goes away;
    if ( "(".equals( nextToken ) ) {
      return true;
    }
    SQLFunction function = functionRegistry.findSQLFunction(lcToken);
    if ( function == null ) {
      // lcToken does not refer to a function
      return false;
    }
    // if function.hasParenthesesIfNoArguments() is true, then assume
    // lcToken is not a function (since it is not followed by '(')
    return ! function.hasParenthesesIfNoArguments();
  }
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  protected SQLFunction getFunction(CriteriaQuery criteriaQuery) {
    return getFunction( getFunctionName(), criteriaQuery );
  }

  protected SQLFunction getFunction(String functionName, CriteriaQuery criteriaQuery) {
    final SQLFunction function = criteriaQuery.getFactory()
        .getSqlFunctionRegistry()
        .findSQLFunction( functionName );
    if ( function == null ) {
      throw new HibernateException( "Unable to locate mapping for function named [" + functionName + "]" );
    }
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    return getFunction( criteriaQuery ).render( null, ARGS, criteriaQuery.getFactory() ) + " as y" + position + '_';
  }

  protected SQLFunction getFunction(CriteriaQuery criteriaQuery) {
    final SQLFunctionRegistry sqlFunctionRegistry = criteriaQuery.getFactory().getSqlFunctionRegistry();
    final SQLFunction function = sqlFunctionRegistry.findSQLFunction( "count" );
    if ( function == null ) {
      throw new HibernateException( "Unable to locate count function mapping" );
    }
    return function;
  }
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  @Override
  protected void beginFunctionTemplate(AST node, AST nameNode) {
    // NOTE for AGGREGATE both nodes are the same; for METHOD the first is the METHOD, the second is the
    //     METHOD_NAME
    FunctionNode functionNode = (FunctionNode) node;
    SQLFunction sqlFunction = functionNode.getSQLFunction();
    if ( sqlFunction == null ) {
      // if SQLFunction is null we just write the function out as it appears in the hql statement
      super.beginFunctionTemplate( node, nameNode );
    }
    else {
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  }

  @Override
  protected void endFunctionTemplate(AST node) {
    FunctionNode functionNode = (FunctionNode) node;
    SQLFunction sqlFunction = functionNode.getSQLFunction();
    if ( sqlFunction == null ) {
      super.endFunctionTemplate( node );
    }
    else {
      final Type functionType = functionNode.getFirstArgumentType();
      // this function has a registered SQLFunction -> redirect output and catch the arguments
      FunctionArguments functionArguments = (FunctionArguments) writer;
      writer = outputStack.removeFirst();
      out( sqlFunction.render( functionType, functionArguments.getArgs(), sessionFactory ) );
    }
  }
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   * @return The sql function.
   *
   * @throws QueryException Indicates no matching sql functions could be found.
   */
  private SQLFunction requireSQLFunction(String functionName) {
    SQLFunction f = findSQLFunction( functionName );
    if ( f == null ) {
      throw new QueryException( "Unable to find SQL function: " + functionName );
    }
    return f;
  }
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