C# SqlSelectBuilder.SetOuterJoins方法代码示例

		public void SelectStringSqlTest()
		{
			Configuration cfg = new Configuration();
			ISessionFactory factory = cfg.BuildSessionFactory();

			ISessionFactoryImplementor factoryImpl = (ISessionFactoryImplementor) factory;
			SqlSelectBuilder select = new SqlSelectBuilder(factoryImpl);

			select.SetSelectClause("column1, column2");
			select.SetFromClause("select_test", "select_test_alias");
			select.SetOuterJoins(
				new SqlString(" LEFT OUTER JOIN before ON select_test_alias.column1 = before.column1"),
				new SqlString(" after.some_field = after.another_field "));
			select.SetOrderByClause(new SqlString("column1 DESC"));

			select.SetWhereClause("select_test_alias", new string[] {"identity_column"}, NHibernateUtil.Int64);

			SqlString sqlString = select.ToSqlString();

			string expectedSql = new StringBuilder().Append("SELECT ")
				.Append("column1, column2 ")
				.Append("FROM select_test select_test_alias ")
				.Append("LEFT OUTER JOIN before ON select_test_alias.column1 = before.column1 ")
				.Append("WHERE ")
				.Append("after.some_field = after.another_field")
				.Append(" AND ")
				.Append("select_test_alias.identity_column = ? ")
				.Append("ORDER BY column1 DESC")
				.ToString();


			Assert.AreEqual(expectedSql, sqlString.ToString(), "SQL String");
			Assert.AreEqual(1, sqlString.GetParameterCount(), "One parameter");
		}

		public void SelectStringSqlTest() 
		{
			Configuration cfg = new Configuration();
			ISessionFactory factory = cfg.BuildSessionFactory( );

			ISessionFactoryImplementor factoryImpl = (ISessionFactoryImplementor)factory;
			SqlSelectBuilder select = new SqlSelectBuilder(factoryImpl);
			
			select.SetSelectClause("column1, column2");
			select.SetFromClause("select_test", "select_test_alias");
			select.SetOuterJoins( new SqlString(" LEFT OUTER JOIN before ON select_test_alias.column1 = before.column1"), new SqlString(" LEFT OUTER JOIN after ON select_test_alias.column1 = after.column1") );
			select.SetOrderByClause("column1 DESC");

			select.SetWhereClause("select_test_alias", new string[] {"identity_column"}, NHibernateUtil.Int64);
 
			SqlString sqlString = select.ToSqlString();

			string expectedSql = new StringBuilder().Append("SELECT ")
				.Append("column1, column2 ")
				.Append("FROM select_test select_test_alias ")
				.Append("LEFT OUTER JOIN before ON select_test_alias.column1 = before.column1 ")
				.Append("WHERE select_test_alias.identity_column = :select_test_alias.identity_column ")
				.Append("LEFT OUTER JOIN after ON select_test_alias.column1 = after.column1 ")
				.Append("ORDER BY column1 DESC")
				.ToString();
				

			int numOfParams = 0;
			Parameter expectedParam = null;

			foreach(object part in sqlString.SqlParts) 
			{
				if(part is Parameter) 
				{
					numOfParams++;
					expectedParam = (Parameter)part;
				}
			}

			Assert.AreEqual(expectedSql , sqlString.ToString(), "SQL String");
			Assert.AreEqual(1, numOfParams, "One parameter");

			Parameter firstParam = new Parameter( "identity_column", "select_test_alias", new SqlTypes.Int64SqlType() );
			Assert.AreEqual(firstParam.SqlType.DbType, expectedParam.SqlType.DbType, "First Parameter Type");
			Assert.AreEqual(firstParam.Name, expectedParam.Name, "First Parameter Name");	
		}

		public virtual object[] GetNaturalIdentifierSnapshot(object id, ISessionImplementor session)
		{
			if (!HasNaturalIdentifier)
			{
				throw new MappingException("persistent class did not define a natural-id : " + MessageHelper.InfoString(this));
			}
			if (log.IsDebugEnabled)
			{
				log.Debug("Getting current natural-id snapshot state for: " + MessageHelper.InfoString(this, id, Factory));
			}

			int[] naturalIdPropertyIndexes = NaturalIdentifierProperties;
			int naturalIdPropertyCount = naturalIdPropertyIndexes.Length;
			bool[] naturalIdMarkers = new bool[PropertySpan];
			IType[] extractionTypes = new IType[naturalIdPropertyCount];
			for (int i = 0; i < naturalIdPropertyCount; i++)
			{
				extractionTypes[i] = PropertyTypes[naturalIdPropertyIndexes[i]];
				naturalIdMarkers[naturalIdPropertyIndexes[i]] = true;
			}

			///////////////////////////////////////////////////////////////////////
			// TODO : look at perhaps caching this...
			SqlSelectBuilder select = new SqlSelectBuilder(Factory);
			if (Factory.Settings.IsCommentsEnabled)
			{
				select.SetComment("get current natural-id state " + EntityName);
			}
			select.SetSelectClause(ConcretePropertySelectFragmentSansLeadingComma(RootAlias, naturalIdMarkers));
			select.SetFromClause(FromTableFragment(RootAlias) + FromJoinFragment(RootAlias, true, false));

			string[] aliasedIdColumns = StringHelper.Qualify(RootAlias, IdentifierColumnNames);
			SqlString whereClause = new SqlStringBuilder()
				.Add(StringHelper.Join(new SqlString("=", Parameter.Placeholder, " and "), aliasedIdColumns))
				.Add("=").AddParameter()
				.Add(WhereJoinFragment(RootAlias, true, false))
				.ToSqlString();

			SqlString sql = select.SetOuterJoins(SqlString.Empty, SqlString.Empty).SetWhereClause(whereClause).ToStatementString();
			///////////////////////////////////////////////////////////////////////

			object[] snapshot = new object[naturalIdPropertyCount];
			using (new SessionIdLoggingContext(session.SessionId)) 
			try
			{
				IDbCommand ps = session.Batcher.PrepareCommand(CommandType.Text, sql, IdentifierType.SqlTypes(factory));
				IDataReader rs = null;
				try
				{
					IdentifierType.NullSafeSet(ps, id, 0, session);
					rs = session.Batcher.ExecuteReader(ps);
					//if there is no resulting row, return null
					if (!rs.Read())
					{
						return null;
					}

					for (int i = 0; i < naturalIdPropertyCount; i++)
					{
						snapshot[i] =
							extractionTypes[i].Hydrate(rs, GetPropertyAliases(string.Empty, naturalIdPropertyIndexes[i]), session, null);
						if (extractionTypes[i].IsEntityType)
						{
							snapshot[i] = extractionTypes[i].ResolveIdentifier(snapshot[i], session, null);
						}
					}
					return snapshot;
				}
				finally
				{
					session.Batcher.CloseCommand(ps, rs);
				}
			}
			catch (DbException sqle)
			{
				var exceptionContext = new AdoExceptionContextInfo
				                       	{
				                       		SqlException = sqle,
				                       		Message = "could not retrieve snapshot: " + MessageHelper.InfoString(this, id, Factory),
				                       		Sql = sql.ToString(),
				                       		EntityName = EntityName,
				                       		EntityId = id
				                       	};
				throw ADOExceptionHelper.Convert(Factory.SQLExceptionConverter, exceptionContext);
			}
		}

		protected SqlString RenderSelect(int[] tableNumbers, int[] columnNumbers, int[] formulaNumbers)
		{
			Array.Sort(tableNumbers); //get 'em in the right order (not that it really matters)

			//render the where and from parts
			int drivingTable = tableNumbers[0];
			string drivingAlias = GenerateTableAlias(RootAlias, drivingTable); //we *could* regenerate this inside each called method!
			SqlString where = CreateWhereByKey(drivingTable, drivingAlias);
			string from = CreateFrom(drivingTable, drivingAlias);

			//now render the joins
			JoinFragment jf = CreateJoin(tableNumbers, drivingAlias);

			//now render the select clause
			SelectFragment selectFragment = CreateSelect(columnNumbers, formulaNumbers);

			//now tie it all together
			SqlSelectBuilder select = new SqlSelectBuilder(Factory);
			select.SetSelectClause(selectFragment.ToFragmentString().Substring(2));
			select.SetFromClause(from);
			select.SetWhereClause(where);
			select.SetOuterJoins(jf.ToFromFragmentString, jf.ToWhereFragmentString);
			if (Factory.Settings.IsCommentsEnabled)
			{
				select.SetComment("sequential select " + EntityName);
			}
			return select.ToSqlString();
		}