UpdateCommand.cs source code in C# .NET

                        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 IEnumerable OutputIdentifiers { get; }

        /// 
        /// Gets all identifiers required by this command. 
        /// 
        internal abstract IEnumerable InputIdentifiers { 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 List GetStateEntries(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 List required, 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, Dictionary identifierValues,
            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 IEnumerable OutputIdentifiers { get; }

        /// 
        /// Gets all identifiers required by this command. 
        /// 
        internal abstract IEnumerable InputIdentifiers { 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 List GetStateEntries(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 List required, 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, Dictionary identifierValues,
            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.
Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
UpdateCommand.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
