Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Map / Update / Internal / UpdateCommand.cs / 1 / UpdateCommand.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Metadata.Edm; using System.Data.Common; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Globalization; using System.Data.Common.Utils; using System.Data.Common.CommandTrees; using System.Data.Objects; using System.Linq; using System.Data.EntityClient; namespace System.Data.Mapping.Update.Internal { internal enum UpdateCommandKind { Dynamic, Function, } ////// Class storing the result of compiling an instance DML command. /// internal abstract class UpdateCommand : IComparable, IEquatable { /// /// Gets all identifiers (key values basically) generated by this command. For instance, /// @@IDENTITY values. /// internal abstract IEnumerableOutputIdentifiers { get; } /// /// Gets all identifiers required by this command. /// internal abstract IEnumerableInputIdentifiers { get; } /// /// Gets table (if any) associated with the current command. FunctionUpdateCommand has no table. /// internal virtual EntitySet Table { get { return null; } } ////// Gets type of command. /// internal abstract UpdateCommandKind Kind { get; } ////// Yields all state entries contributing to this command. Used for error reporting. /// /// Translator context. ///Related state entries. internal abstract ListGetStateEntries(UpdateTranslator translator); /// /// Determines model level dependencies for the current command. A command 'requires' an entity /// (in other words, it must follow commands 'producing' that entity) if it deletes the entity /// or inserts a relationship to that entity. A command 'produces' an entity (in other words, /// it must precede commands 'requiring' that entity) if it inserts the entity or deletes a relationship /// to that entity. /// internal void GetRequiredAndProducedEntities(UpdateTranslator translator, out Listrequired, out List produced) { List stateEntries = GetStateEntries(translator); required = new List (); produced = new List (); // determine parent entity (a command must handle at most one entity) EntityKey parent = null; foreach (IEntityStateEntry stateEntry in stateEntries) { if (!stateEntry.IsRelationship) { parent = stateEntry.EntityKey; Debug.Assert(stateEntries.Where(e => !e.IsRelationship).Select(e => e.EntityKey).Distinct().Count() <= 1, "more than one IEntityStateEntry is an Entity!"); if (stateEntry.State == EntityState.Added) { produced.Add(parent); } else if (stateEntry.State == EntityState.Deleted) { required.Add(parent); } break; } } // process relationships foreach (IEntityStateEntry stateEntry in stateEntries) { if (stateEntry.IsRelationship) { // only worry about the relationship if it is being added or deleted bool isAdded = stateEntry.State == EntityState.Added; if (isAdded || stateEntry.State == EntityState.Deleted) { DbDataRecord record = isAdded ? (DbDataRecord)stateEntry.CurrentValues : stateEntry.OriginalValues; Debug.Assert(2 == record.FieldCount, "non-binary relationship?"); EntityKey end1 = (EntityKey)record[0]; EntityKey end2 = (EntityKey)record[1]; // relationships require the entity when they're added and free the entity when they're deleted... List affected = isAdded ? required : produced; if (parent == null) { // both ends are being modified by the relationship affected.Add(end1); affected.Add(end2); } else { // only the end opposite the parent is being modified by the relationship... if (parent.Equals(end1)) { affected.Add(end2); } else { affected.Add(end1); } } } } } } /// /// Executes the current update command. /// /// Translator context. /// EntityConnection to use (and implicitly, the EntityTransaction to use). /// Aggregator for identifier values (read for InputIdentifiers; write for /// OutputIdentifiers /// Aggregator for server generated values. ///Number of rows affected by the command. internal abstract int Execute(UpdateTranslator translator, EntityConnection connection, DictionaryidentifierValues, List > generatedValues); internal abstract int CompareToType(UpdateCommand other); public int CompareTo(UpdateCommand other) { if (this.Equals(other)) { return 0; } Debug.Assert(null != other, "comparing to null UpdateCommand"); int result = (int)this.Kind - (int)other.Kind; if (0 != result) { return result; } // defer to specific type for other comparisons... result = CompareToType(other); return result; } #region IEquatable: note that we use reference equality public bool Equals(UpdateCommand other) { return base.Equals(other); } public override bool Equals(object obj) { return base.Equals(obj); } public override int GetHashCode() { return base.GetHashCode(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Metadata.Edm; using System.Data.Common; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Globalization; using System.Data.Common.Utils; using System.Data.Common.CommandTrees; using System.Data.Objects; using System.Linq; using System.Data.EntityClient; namespace System.Data.Mapping.Update.Internal { internal enum UpdateCommandKind { Dynamic, Function, } ////// Class storing the result of compiling an instance DML command. /// internal abstract class UpdateCommand : IComparable, IEquatable { /// /// Gets all identifiers (key values basically) generated by this command. For instance, /// @@IDENTITY values. /// internal abstract IEnumerableOutputIdentifiers { get; } /// /// Gets all identifiers required by this command. /// internal abstract IEnumerableInputIdentifiers { get; } /// /// Gets table (if any) associated with the current command. FunctionUpdateCommand has no table. /// internal virtual EntitySet Table { get { return null; } } ////// Gets type of command. /// internal abstract UpdateCommandKind Kind { get; } ////// Yields all state entries contributing to this command. Used for error reporting. /// /// Translator context. ///Related state entries. internal abstract ListGetStateEntries(UpdateTranslator translator); /// /// Determines model level dependencies for the current command. A command 'requires' an entity /// (in other words, it must follow commands 'producing' that entity) if it deletes the entity /// or inserts a relationship to that entity. A command 'produces' an entity (in other words, /// it must precede commands 'requiring' that entity) if it inserts the entity or deletes a relationship /// to that entity. /// internal void GetRequiredAndProducedEntities(UpdateTranslator translator, out Listrequired, out List produced) { List stateEntries = GetStateEntries(translator); required = new List (); produced = new List (); // determine parent entity (a command must handle at most one entity) EntityKey parent = null; foreach (IEntityStateEntry stateEntry in stateEntries) { if (!stateEntry.IsRelationship) { parent = stateEntry.EntityKey; Debug.Assert(stateEntries.Where(e => !e.IsRelationship).Select(e => e.EntityKey).Distinct().Count() <= 1, "more than one IEntityStateEntry is an Entity!"); if (stateEntry.State == EntityState.Added) { produced.Add(parent); } else if (stateEntry.State == EntityState.Deleted) { required.Add(parent); } break; } } // process relationships foreach (IEntityStateEntry stateEntry in stateEntries) { if (stateEntry.IsRelationship) { // only worry about the relationship if it is being added or deleted bool isAdded = stateEntry.State == EntityState.Added; if (isAdded || stateEntry.State == EntityState.Deleted) { DbDataRecord record = isAdded ? (DbDataRecord)stateEntry.CurrentValues : stateEntry.OriginalValues; Debug.Assert(2 == record.FieldCount, "non-binary relationship?"); EntityKey end1 = (EntityKey)record[0]; EntityKey end2 = (EntityKey)record[1]; // relationships require the entity when they're added and free the entity when they're deleted... List affected = isAdded ? required : produced; if (parent == null) { // both ends are being modified by the relationship affected.Add(end1); affected.Add(end2); } else { // only the end opposite the parent is being modified by the relationship... if (parent.Equals(end1)) { affected.Add(end2); } else { affected.Add(end1); } } } } } } /// /// Executes the current update command. /// /// Translator context. /// EntityConnection to use (and implicitly, the EntityTransaction to use). /// Aggregator for identifier values (read for InputIdentifiers; write for /// OutputIdentifiers /// Aggregator for server generated values. ///Number of rows affected by the command. internal abstract int Execute(UpdateTranslator translator, EntityConnection connection, DictionaryidentifierValues, List > generatedValues); internal abstract int CompareToType(UpdateCommand other); public int CompareTo(UpdateCommand other) { if (this.Equals(other)) { return 0; } Debug.Assert(null != other, "comparing to null UpdateCommand"); int result = (int)this.Kind - (int)other.Kind; if (0 != result) { return result; } // defer to specific type for other comparisons... result = CompareToType(other); return result; } #region IEquatable: note that we use reference equality public bool Equals(UpdateCommand other) { return base.Equals(other); } public override bool Equals(object obj) { return base.Equals(obj); } public override int GetHashCode() { return base.GetHashCode(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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