C# SqlCommand.SqlSelectBuilder类代码示例

		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");
		}

		private void InitStatementString(IOuterJoinLoadable elementPersister, string alias, int batchSize, SqlString subquery)
		{
			int joins = CountEntityPersisters(associations);
			Suffixes = BasicLoader.GenerateSuffixes(joins + 1);

			int collectionJoins = CountCollectionPersisters(associations) + 1;
			CollectionSuffixes = BasicLoader.GenerateSuffixes(joins + 1, collectionJoins);

			SqlStringBuilder whereString = WhereString(alias, oneToManyPersister.KeyColumnNames, subquery, batchSize);
			string filter = oneToManyPersister.FilterFragment(alias, EnabledFilters);
			whereString.Insert(0, StringHelper.MoveAndToBeginning(filter));

			JoinFragment ojf = MergeOuterJoins(associations);
			SqlSelectBuilder select =
				new SqlSelectBuilder(Factory).SetSelectClause(
					oneToManyPersister.SelectFragment(null, null, alias, Suffixes[joins], CollectionSuffixes[0], true)
					+ SelectString(associations)).SetFromClause(elementPersister.FromTableFragment(alias)
					                                            + elementPersister.FromJoinFragment(alias, true, true)).SetWhereClause(
					whereString.ToSqlString()).SetOuterJoins(ojf.ToFromFragmentString,
					                                         ojf.ToWhereFragmentString
					                                         + elementPersister.WhereJoinFragment(alias, true, true));

			select.SetOrderByClause(OrderBy(associations, oneToManyPersister.GetSQLOrderByString(alias)));

			if (Factory.Settings.IsCommentsEnabled)
			{
				select.SetComment("load one-to-many " + oneToManyPersister.Role);
			}

			SqlString = select.ToSqlString();
		}

		private void InitStatementString(SqlString projection,SqlString condition,
			string orderBy,string groupBy,LockMode lockMode)
		{
			int joins = CountEntityPersisters(associations);
			Suffixes = BasicLoader.GenerateSuffixes(joins + 1);
			JoinFragment ojf = MergeOuterJoins(associations);

			SqlString selectClause = projection
			                         ??
			                         new SqlString(persister.SelectFragment(alias, Suffixes[joins]) + SelectString(associations));
			
			SqlSelectBuilder select = new SqlSelectBuilder(Factory)
				.SetLockMode(lockMode)
				.SetSelectClause(selectClause)
				.SetFromClause(Dialect.AppendLockHint(lockMode, persister.FromTableFragment(alias)) +persister.FromJoinFragment(alias, true, true))
				.SetWhereClause(condition)
				.SetOuterJoins(ojf.ToFromFragmentString,ojf.ToWhereFragmentString + WhereFragment)
				.SetOrderByClause(OrderBy(associations, orderBy))
				.SetGroupByClause(groupBy);

			if (Factory.Settings.IsCommentsEnabled)
				select.SetComment(Comment);

			SqlString = select.ToSqlString();
		}

		protected SqlString GenerateIdInsertSelect(IQueryable persister, string tableAlias, IASTNode whereClause)
		{
			var select = new SqlSelectBuilder(Factory);
			SelectFragment selectFragment = new SelectFragment(Factory.Dialect)
				.AddColumns(tableAlias, persister.IdentifierColumnNames, persister.IdentifierColumnNames);
			select.SetSelectClause(selectFragment.ToFragmentString().Substring(2));

			string rootTableName = persister.TableName;
			SqlString fromJoinFragment = persister.FromJoinFragment(tableAlias, true, false);
			SqlString whereJoinFragment = persister.WhereJoinFragment(tableAlias, true, false);

			select.SetFromClause(rootTableName + ' ' + tableAlias + fromJoinFragment);

			if (whereJoinFragment == null)
			{
				whereJoinFragment = SqlString.Empty;
			}
			else
			{
				whereJoinFragment = whereJoinFragment.Trim();
				if (whereJoinFragment.StartsWithCaseInsensitive("and "))
				{
					whereJoinFragment = whereJoinFragment.Substring(4);
				}
			}

			SqlString userWhereClause = SqlString.Empty;
			if (whereClause.ChildCount != 0)
			{
				// If a where clause was specified in the update/delete query, use it to limit the
				// returned ids here...
				try
				{
					var nodes = new CommonTreeNodeStream(whereClause);
					var gen = new SqlGenerator(Factory, nodes);
					gen.whereClause();
					userWhereClause = gen.GetSQL().Substring(7);
				}
				catch (RecognitionException e)
				{
					throw new HibernateException("Unable to generate id select for DML operation", e);
				}
				if (whereJoinFragment.Length > 0)
				{
					whereJoinFragment.Append(" and ");
				}
			}

			select.SetWhereClause(whereJoinFragment + userWhereClause);

			var insert = new InsertSelect();
			if (Factory.Settings.IsCommentsEnabled)
			{
				insert.SetComment("insert-select for " + persister.EntityName + " ids");
			}
			insert.SetTableName(persister.TemporaryIdTableName);
			insert.SetSelect(select);
			return insert.ToSqlString();
		}

		private void InitStatementString(string alias, int batchSize, SqlString subquery)
		{
			int joins = CountEntityPersisters(associations);
			int collectionJoins = CountCollectionPersisters(associations) + 1;
			Suffixes = BasicLoader.GenerateSuffixes(joins);
			CollectionSuffixes = BasicLoader.GenerateSuffixes(joins, collectionJoins);

			SqlStringBuilder whereString = WhereString(alias, collectionPersister.KeyColumnNames, subquery, batchSize);

			string manyToManyOrderBy = string.Empty;
			string filter = collectionPersister.FilterFragment(alias, EnabledFilters);

			if (collectionPersister.IsManyToMany)
			{
				// from the collection of associations, locate OJA for the
				// ManyToOne corresponding to this persister to fully
				// define the many-to-many; we need that OJA so that we can
				// use its alias here
				// TODO : is there a better way here?
				IAssociationType associationType = (IAssociationType)collectionPersister.ElementType;
				foreach (OuterJoinableAssociation oja in associations)
				{
					if (oja.JoinableType == associationType)
					{
						// we found it
						filter += collectionPersister.GetManyToManyFilterFragment(oja.RHSAlias, EnabledFilters);
						manyToManyOrderBy += collectionPersister.GetManyToManyOrderByString(oja.RHSAlias);
					}
				}
			}

			whereString.Insert(0, StringHelper.MoveAndToBeginning(filter));
			JoinFragment ojf = MergeOuterJoins(associations);

			SqlSelectBuilder select =
				new SqlSelectBuilder(Factory)
				.SetSelectClause(collectionPersister.SelectFragment(alias, CollectionSuffixes[0])
				                                              + SelectString(associations))
				.SetFromClause(collectionPersister.TableName, alias)
				.SetWhereClause(whereString.ToSqlString())
				.SetOuterJoins(ojf.ToFromFragmentString, ojf.ToWhereFragmentString);

			select.SetOrderByClause(OrderBy(associations, MergeOrderings(collectionPersister.GetSQLOrderByString(alias), manyToManyOrderBy)));

			if (Factory.Settings.IsCommentsEnabled)
				select.SetComment("load collection " + collectionPersister.Role);

			SqlString = select.ToSqlString();
		}

		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();
		}

		protected virtual SqlString GenerateSnapshotSelectString()
		{
			//TODO: should we use SELECT .. FOR UPDATE?

			SqlSelectBuilder select = new SqlSelectBuilder(Factory);

			if (Factory.Settings.IsCommentsEnabled)
			{
				select.SetComment("get current state " + EntityName);
			}

			string[] aliasedIdColumns = StringHelper.Qualify(RootAlias, IdentifierColumnNames);
			string selectClause = StringHelper.Join(StringHelper.CommaSpace, aliasedIdColumns)
														+ ConcretePropertySelectFragment(RootAlias, PropertyUpdateability);

			SqlString fromClause = new SqlString(FromTableFragment(RootAlias)) +
														 FromJoinFragment(RootAlias, true, false);

			SqlString joiner = new SqlString("=", Parameter.Placeholder, " and ");
			SqlStringBuilder whereClauseBuilder = new SqlStringBuilder()
				.Add(StringHelper.Join(joiner, aliasedIdColumns))
				.Add("=")
				.AddParameter()
				.Add(WhereJoinFragment(RootAlias, true, false));

			// H3.2 the Snapshot is what we found in DB without take care on version
			//if (IsVersioned)
			//{
			//  whereClauseBuilder.Add(" and ")
			//    .Add(VersionColumnName)
			//    .Add("=")
			//    .AddParameter();
			//}

			return select.SetSelectClause(selectClause)
				.SetFromClause(fromClause)
				.SetOuterJoins(SqlString.Empty, SqlString.Empty)
				.SetWhereClause(whereClauseBuilder.ToSqlString())
				.ToSqlString();
		}

		private SqlString GenerateGeneratedValuesSelectString(ValueInclusion[] inclusions)
		{
			SqlSelectBuilder select = new SqlSelectBuilder(Factory);

			if (Factory.Settings.IsCommentsEnabled)
			{
				select.SetComment("get generated state " + EntityName);
			}

			string[] aliasedIdColumns = StringHelper.Qualify(RootAlias, IdentifierColumnNames);

			// Here we render the select column list based on the properties defined as being generated.
			// For partial component generation, we currently just re-select the whole component
			// rather than trying to handle the individual generated portions.
			string selectClause = ConcretePropertySelectFragment(RootAlias, inclusions);
			selectClause = selectClause.Substring(2);

			string fromClause = FromTableFragment(RootAlias) + FromJoinFragment(RootAlias, true, false);

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

			return select.SetSelectClause(selectClause)
				.SetFromClause(fromClause)
				.SetOuterJoins(SqlString.Empty, SqlString.Empty)
				.SetWhereClause(whereClause)
				.ToSqlString();
		}

		public virtual InsertSelect SetSelect(SqlSelectBuilder select)
		{
			this.select = select;
			return this;
		}

		private void InitStatementString( IQueryableCollection persister, string alias, IList associations, int batchSize, ISessionFactoryImplementor factory )
		{
			Suffixes = GenerateSuffixes( associations.Count );

			SqlStringBuilder whereString = WhereString( factory, alias, persister.KeyColumnNames, persister.KeyType, batchSize );
			if( persister.HasWhere )
			{
				whereString
					.Add( " and " )
					.Add( persister.GetSQLWhereString( alias ) );
			}

			JoinFragment ojf = MergeOuterJoins( associations );
			SqlSelectBuilder select = new SqlSelectBuilder( factory )
				.SetSelectClause(
				persister.SelectFragment( alias ).Append(
					SelectString( associations, factory ) ).ToString()
				)
				.SetFromClause( persister.TableName, alias )
				.SetWhereClause( whereString.ToSqlString() )
				.SetOuterJoins(
				ojf.ToFromFragmentString,
				ojf.ToWhereFragmentString
				);

			if( persister.HasOrdering )
			{
				select.SetOrderByClause( persister.GetSQLOrderByString( alias ) );
			}
			SqlString = select.ToSqlString();
		}

		protected virtual SqlString GenerateSnapshotSelectString()
		{
			//TODO: should we use SELECT .. FOR UPDATE?

			SqlSelectBuilder select = new SqlSelectBuilder(Factory);

			//if (Factory.Settings.IsCommentsEnabled)
			//{
			//    select.SetComment("get current state " + ClassName);
			//}

			string[] aliasedIdColumns = StringHelper.Qualify(RootAlias, IdentifierColumnNames);
			string selectClause = StringHelper.Join(", ", aliasedIdColumns) +
			                      ConcretePropertySelectFragment(RootAlias, PropertyUpdateability);

			SqlString fromClause = new SqlString(FromTableFragment(RootAlias)) +
			                       FromJoinFragment(RootAlias, true, false);

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

			// TODO H3: this is commented out in H3.2
			if (IsVersioned)
			{
				whereClause.Append(" and ")
					.Append(VersionColumnName)
					.Append("=?");
			}

			return select.SetSelectClause(selectClause)
				.SetFromClause(fromClause)
				.SetOuterJoins(SqlString.Empty, SqlString.Empty)
				.SetWhereClause(whereClause)
				.ToSqlString();
		}