Examples of org.hibernate.dialect.function.SQLFunction

org.hibernate.dialect.function.SQLFunction
Provides support routines for the HQL functions as used in the various SQL Dialects Provides an interface for supporting various HQL functions that are translated to SQL. The Dialect and its sub-classes use this interface to provide details required for processing of the function. @author David Channon

    }
  }


  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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   * @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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  public Type getDataType() {
    Type type = super.getDataType();
    if (type != null) return type;
    FromElement fe = getFromElement();
    if (fe != null) return fe.getDataType();
    SQLFunction sf = getWalker().getSessionFactoryHelper().findSQLFunction(getText());
    return sf == null ? null : sf.getReturnType(null, null);
  }

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      return true;
    }


    // otherwise, in order for this to be a function logically it has to be a function that does not
    // have arguments.  So try to assert that using the registry of known functions
    final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( ast.getText() );
    if ( function == null ) {
      // no registered function, so we cannot know for certain
      return false;
    }
    else {
      // if function.hasParenthesesIfNoArguments() is true, then assume the node is not a function
      return ! function.hasParenthesesIfNoArguments();
    }
  }

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      assert "{param list}".equals(  child.getText() );
      child = child.getFirstChild();
    }


    final String functionName = ast.getText();
    final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( functionName );
    if ( function == null ) {
      String text = functionName;
      if ( child != null ) {
        text += '(';
        while ( child != null ) {
          text += resolveFunctionArgument( child );
          child = child.getNextSibling();
          if ( child != null ) {
            text += ", ";
          }
        }
        text += ')';
      }
      return getASTFactory().create( OrderByTemplateTokenTypes.IDENT, text );
    }
    else {
      ArrayList expressions = new ArrayList();
      while ( child != null ) {
        expressions.add( resolveFunctionArgument( child ) );
        child = child.getNextSibling();
      }
      final String text = function.render( null, expressions, context.getSessionFactory() );
      return getASTFactory().create( OrderByTemplateTokenTypes.IDENT, text );
    }
  }

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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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    // assume it is a function if it has parameters
    if ( child != null && "{param list}".equals( child.getText() ) ) {
      return true;
    }


    final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( ast.getText() );
    if ( function == null ) {
      return false;
    }


    // if function.hasParenthesesIfNoArguments() is true, then assume
    // ast.getText() is not a function.
    return ! function.hasParenthesesIfNoArguments();
  }

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      assert "{param list}".equals(  child.getText() );
      child = child.getFirstChild();
    }


    final String functionName = ast.getText();
    final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( functionName );
    if ( function == null ) {
      String text = functionName;
      if ( child != null ) {
        text += '(';
        while ( child != null ) {
          text += child.getText();
          child = child.getNextSibling();
          if ( child != null ) {
            text += ", ";
          }
        }
        text += ')';
      }
      return getASTFactory().create( OrderByTemplateTokenTypes.IDENT, text );
    }
    else {
      ArrayList expressions = new ArrayList();
      while ( child != null ) {
        expressions.add( child.getText() );
        child = child.getNextSibling();
      }
      final String text = function.render( null, expressions, context.getSessionFactory() );
      return getASTFactory().create( OrderByTemplateTokenTypes.IDENT, text );
    }
  }

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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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org.hibernate.criterion.RowCountProjection

org.hibernate.hql.ast.SqlGenerator

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org.hibernate.hql.internal.ast.SqlGenerator

org.hibernate.hql.internal.ast.tree.IdentNode

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org.hibernate.sql.ordering.antlr.OrderByFragmentParser

org.hibernate.sql.Template

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