Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / LongTypeConverter.cs / 1 / LongTypeConverter.cs
using System; using System.Collections.Generic; using System.Text; using System.Data.Linq; namespace System.Data.Linq.SqlClient { ////// Converts expressions of type NText, Text, Image to NVarChar(MAX), VarChar(MAX), VarBinary(MAX) /// where necessary. This can only be done on SQL2005, so we add a SqlServerCompatibilityAnnotation /// to the changed nodes. /// internal class LongTypeConverter { Visitor visitor; internal LongTypeConverter(SqlFactory sql) { this.visitor = new Visitor(sql); } internal SqlNode AddConversions(SqlNode node, SqlNodeAnnotations annotations) { visitor.Annotations = annotations; return visitor.Visit(node); } class Visitor : SqlVisitor { SqlFactory sql; SqlNodeAnnotations annotations; internal SqlNodeAnnotations Annotations { set { this.annotations = value; } } internal Visitor(SqlFactory sql) { this.sql = sql; } private SqlExpression ConvertToMax(SqlExpression expr, ProviderType newType) { return sql.UnaryConvert(expr.ClrType, newType, expr, expr.SourceExpression); } // returns CONVERT(VARCHAR/NVARCHAR/VARBINARY(MAX), expr) if provType is one of Text, NText or Image // otherwise just returns expr // changed is true if CONVERT(...(MAX),...) was added private SqlExpression ConvertToMax(SqlExpression expr, out bool changed) { changed = false; if (!expr.SqlType.IsLargeType) return expr; ProviderType newType = sql.TypeProvider.GetBestLargeType(expr.SqlType); changed = true; if (expr.SqlType != newType) { return ConvertToMax(expr, newType); } changed = false; return expr; } private void ConvertColumnsToMax(SqlSelect select, out bool changed, out bool containsLongExpressions) { SqlRow row = select.Row; changed = false; containsLongExpressions = false; foreach (SqlColumn col in row.Columns) { bool columnChanged; containsLongExpressions = containsLongExpressions || col.SqlType.IsLargeType; col.Expression = ConvertToMax(col.Expression, out columnChanged); changed = changed || columnChanged; } } internal override SqlSelect VisitSelect(SqlSelect select) { if (select.IsDistinct) { bool changed; bool containsLongExpressions; ConvertColumnsToMax(select, out changed, out containsLongExpressions); if (containsLongExpressions) { this.annotations.Add(select, new SqlServerCompatibilityAnnotation( Strings.TextNTextAndImageCannotOccurInDistinct(select.SourceExpression), SqlProvider.ProviderMode.Sql2000, SqlProvider.ProviderMode.SqlCE)); } } return base.VisitSelect(select); } internal override SqlNode VisitUnion(SqlUnion su) { bool changedLeft = false; bool containsLongExpressionsLeft = false; SqlSelect left = su.Left as SqlSelect; if (left != null) { ConvertColumnsToMax(left, out changedLeft, out containsLongExpressionsLeft); } bool changedRight = false; bool containsLongExpressionsRight = false; SqlSelect right = su.Right as SqlSelect; if (right != null) { ConvertColumnsToMax(right, out changedRight, out containsLongExpressionsRight); } if (!su.All && (containsLongExpressionsLeft || containsLongExpressionsRight)) { // unless the UNION is 'ALL', the server will perform a DISTINCT operation, // which isn't valid for large types (text, ntext, image) this.annotations.Add(su, new SqlServerCompatibilityAnnotation( Strings.TextNTextAndImageCannotOccurInUnion(su.SourceExpression), SqlProvider.ProviderMode.Sql2000, SqlProvider.ProviderMode.SqlCE)); } return base.VisitUnion(su); } internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) { if (fc.Name == "LEN") { bool changed; fc.Arguments[0] = ConvertToMax(fc.Arguments[0],out changed); if (fc.Arguments[0].SqlType.IsLargeType) { this.annotations.Add(fc, new SqlServerCompatibilityAnnotation( Strings.LenOfTextOrNTextNotSupported(fc.SourceExpression), SqlProvider.ProviderMode.Sql2000)); } } return base.VisitFunctionCall(fc); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections.Generic; using System.Text; using System.Data.Linq; namespace System.Data.Linq.SqlClient { ////// Converts expressions of type NText, Text, Image to NVarChar(MAX), VarChar(MAX), VarBinary(MAX) /// where necessary. This can only be done on SQL2005, so we add a SqlServerCompatibilityAnnotation /// to the changed nodes. /// internal class LongTypeConverter { Visitor visitor; internal LongTypeConverter(SqlFactory sql) { this.visitor = new Visitor(sql); } internal SqlNode AddConversions(SqlNode node, SqlNodeAnnotations annotations) { visitor.Annotations = annotations; return visitor.Visit(node); } class Visitor : SqlVisitor { SqlFactory sql; SqlNodeAnnotations annotations; internal SqlNodeAnnotations Annotations { set { this.annotations = value; } } internal Visitor(SqlFactory sql) { this.sql = sql; } private SqlExpression ConvertToMax(SqlExpression expr, ProviderType newType) { return sql.UnaryConvert(expr.ClrType, newType, expr, expr.SourceExpression); } // returns CONVERT(VARCHAR/NVARCHAR/VARBINARY(MAX), expr) if provType is one of Text, NText or Image // otherwise just returns expr // changed is true if CONVERT(...(MAX),...) was added private SqlExpression ConvertToMax(SqlExpression expr, out bool changed) { changed = false; if (!expr.SqlType.IsLargeType) return expr; ProviderType newType = sql.TypeProvider.GetBestLargeType(expr.SqlType); changed = true; if (expr.SqlType != newType) { return ConvertToMax(expr, newType); } changed = false; return expr; } private void ConvertColumnsToMax(SqlSelect select, out bool changed, out bool containsLongExpressions) { SqlRow row = select.Row; changed = false; containsLongExpressions = false; foreach (SqlColumn col in row.Columns) { bool columnChanged; containsLongExpressions = containsLongExpressions || col.SqlType.IsLargeType; col.Expression = ConvertToMax(col.Expression, out columnChanged); changed = changed || columnChanged; } } internal override SqlSelect VisitSelect(SqlSelect select) { if (select.IsDistinct) { bool changed; bool containsLongExpressions; ConvertColumnsToMax(select, out changed, out containsLongExpressions); if (containsLongExpressions) { this.annotations.Add(select, new SqlServerCompatibilityAnnotation( Strings.TextNTextAndImageCannotOccurInDistinct(select.SourceExpression), SqlProvider.ProviderMode.Sql2000, SqlProvider.ProviderMode.SqlCE)); } } return base.VisitSelect(select); } internal override SqlNode VisitUnion(SqlUnion su) { bool changedLeft = false; bool containsLongExpressionsLeft = false; SqlSelect left = su.Left as SqlSelect; if (left != null) { ConvertColumnsToMax(left, out changedLeft, out containsLongExpressionsLeft); } bool changedRight = false; bool containsLongExpressionsRight = false; SqlSelect right = su.Right as SqlSelect; if (right != null) { ConvertColumnsToMax(right, out changedRight, out containsLongExpressionsRight); } if (!su.All && (containsLongExpressionsLeft || containsLongExpressionsRight)) { // unless the UNION is 'ALL', the server will perform a DISTINCT operation, // which isn't valid for large types (text, ntext, image) this.annotations.Add(su, new SqlServerCompatibilityAnnotation( Strings.TextNTextAndImageCannotOccurInUnion(su.SourceExpression), SqlProvider.ProviderMode.Sql2000, SqlProvider.ProviderMode.SqlCE)); } return base.VisitUnion(su); } internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) { if (fc.Name == "LEN") { bool changed; fc.Arguments[0] = ConvertToMax(fc.Arguments[0],out changed); if (fc.Arguments[0].SqlType.IsLargeType) { this.annotations.Add(fc, new SqlServerCompatibilityAnnotation( Strings.LenOfTextOrNTextNotSupported(fc.SourceExpression), SqlProvider.ProviderMode.Sql2000)); } } return base.VisitFunctionCall(fc); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- securestring.cs
- RelationshipWrapper.cs
- NavigationPropertyEmitter.cs
- ControllableStoryboardAction.cs
- GridPattern.cs
- ContentType.cs
- ConditionalDesigner.cs
- QualifierSet.cs
- Point3DCollection.cs
- ProcessingInstructionAction.cs
- MatrixStack.cs
- TimeoutException.cs
- XmlValueConverter.cs
- LineGeometry.cs
- odbcmetadatacolumnnames.cs
- AccessedThroughPropertyAttribute.cs
- HtmlInputFile.cs
- XmlSerializerNamespaces.cs
- OutputCacheModule.cs
- ValidationSummary.cs
- PropertyPathConverter.cs
- ChildrenQuery.cs
- GridViewColumnHeader.cs
- HealthMonitoringSection.cs
- MediaElement.cs
- BindingMemberInfo.cs
- WinCategoryAttribute.cs
- QilFactory.cs
- MappingModelBuildProvider.cs
- _LocalDataStoreMgr.cs
- SecurityProtocol.cs
- DataServiceHostFactory.cs
- ProfilePropertySettings.cs
- Peer.cs
- ConfigurationProviderException.cs
- MetadataFile.cs
- PreservationFileReader.cs
- CommonXSendMessage.cs
- Hyperlink.cs
- PageThemeCodeDomTreeGenerator.cs
- ParameterToken.cs
- TransactionScopeDesigner.cs
- InstanceDataCollectionCollection.cs
- CodeCompiler.cs
- PlaceHolder.cs
- SystemInformation.cs
- NativeCompoundFileAPIs.cs
- InstancePersistence.cs
- sqlnorm.cs
- ExeContext.cs
- IisTraceListener.cs
- DbConnectionClosed.cs
- DataGridBeginningEditEventArgs.cs
- MachineKeyConverter.cs
- CodeVariableReferenceExpression.cs
- FontNamesConverter.cs
- ConcurrencyBehavior.cs
- OleDbMetaDataFactory.cs
- RemoteCryptoTokenProvider.cs
- SevenBitStream.cs
- QuotedPrintableStream.cs
- UTF7Encoding.cs
- ConsoleEntryPoint.cs
- FlowchartStart.xaml.cs
- DataTableClearEvent.cs
- UniqueConstraint.cs
- BroadcastEventHelper.cs
- IPeerNeighbor.cs
- RegisteredScript.cs
- ClientBuildManagerTypeDescriptionProviderBridge.cs
- DialogDivider.cs
- ToolStrip.cs
- EditBehavior.cs
- SimpleParser.cs
- UnmanagedMemoryStreamWrapper.cs
- ProcessProtocolHandler.cs
- ApplicationFileParser.cs
- SourceItem.cs
- XmlCompatibilityReader.cs
- NamespaceDecl.cs
- SafeNativeMemoryHandle.cs
- RelationshipEndMember.cs
- SafeNativeMethods.cs
- TraceUtility.cs
- SinglePageViewer.cs
- IsolatedStorageFilePermission.cs
- BaseDataBoundControl.cs
- OpenTypeLayoutCache.cs
- RectAnimationBase.cs
- ResourceReferenceExpression.cs
- Vector3DCollection.cs
- GenericUriParser.cs
- ValidationHelper.cs
- DrawingContext.cs
- MiniAssembly.cs
- ApplicationTrust.cs
- CharacterBuffer.cs
- InputManager.cs
- HTMLTextWriter.cs
- MiniCustomAttributeInfo.cs