C# SqlGenerator.SimpleExpr方法代码示例

		public override void  Resolve(bool generateJoin, bool implicitJoin, string classAlias, IASTNode parent)
		{
			if (IsResolved) 
			{
				return;
			}

			FromReferenceNode collectionNode = ( FromReferenceNode ) GetChild(0);
			SessionFactoryHelperExtensions sessionFactoryHelper = SessionFactoryHelper;
			collectionNode.ResolveIndex( this );		// Fully resolve the map reference, create implicit joins.

			IType type = collectionNode.DataType;
			if ( !type.IsCollectionType ) 
			{
				throw new SemanticException( "The [] operator cannot be applied to type " + type);
			}

			string collectionRole = ( ( CollectionType ) type ).Role;
			IQueryableCollection queryableCollection = sessionFactoryHelper.RequireQueryableCollection( collectionRole );
			if ( !queryableCollection.HasIndex ) 
			{
				throw new QueryException( "unindexed fromElement before []: " + collectionNode.Path );
			}

			// Generate the inner join -- The elements need to be joined to the collection they are in.
			FromElement fromElement = collectionNode.FromElement;
			String elementTable = fromElement.TableAlias;
			FromClause fromClause = fromElement.FromClause;
			String path = collectionNode.Path;

			FromElement elem = fromClause.FindCollectionJoin( path );
			if ( elem == null ) 
			{
				FromElementFactory factory = new FromElementFactory( fromClause, fromElement, path );
				elem = factory.CreateCollectionElementsJoin( queryableCollection, elementTable );
				if ( Log.IsDebugEnabled )
				{
					Log.Debug( "No FROM element found for the elements of collection join path " + path
							+ ", created " + elem );
				}
			}
			else 
			{
				if ( Log.IsDebugEnabled ) 
				{
					Log.Debug( "FROM element found for collection join path " + path );
				}
			}

			// The 'from element' that represents the elements of the collection.
			FromElement = fromElement;

			// Add the condition to the join sequence that qualifies the indexed element.
			IASTNode selector = GetChild(1);
			if ( selector == null ) 
			{
				throw new QueryException( "No index value!" );
			}

			// Sometimes use the element table alias, sometimes use the... umm... collection table alias (many to many)
			String collectionTableAlias = elementTable;
			if ( elem.CollectionTableAlias != null ) 
			{
				collectionTableAlias = elem.CollectionTableAlias;
			}

			// TODO: get SQL rendering out of here, create an AST for the join expressions.
			// Use the SQL generator grammar to generate the SQL text for the index expression.
			JoinSequence joinSequence = fromElement.JoinSequence;
			string[] indexCols = queryableCollection.IndexColumnNames;
			if ( indexCols.Length != 1 ) 
			{
				throw new QueryException( "composite-index appears in []: " + collectionNode.Path );
			}

			SqlGenerator gen = new SqlGenerator(SessionFactoryHelper.Factory, new CommonTreeNodeStream(selector));

			try 
			{
				gen.SimpleExpr(); //TODO: used to be exprNoParens! was this needed?
			}
			catch ( RecognitionException e ) 
			{
				throw new QueryException( e.Message, e );
			}

			string selectorExpression = gen.GetSQL().ToString();

			joinSequence.AddCondition(new SqlString(collectionTableAlias + '.' + indexCols[0] + " = " + selectorExpression ));
			//joinSequence.AddCondition(collectionTableAlias, new string[] { indexCols[0] }, selectorExpression, false);

			IList<IParameterSpecification> paramSpecs = gen.GetCollectedParameters();
			if ( paramSpecs != null ) 
			{
				switch ( paramSpecs.Count ) 
				{
					case 0 :
						// nothing to do
						break;
					case 1 :
//.........这里部分代码省略.........