DbUpdateCommandTree.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / DbUpdateCommandTree.cs / 2 / DbUpdateCommandTree.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 

using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal;
using System.Data.Common.Utils; 
using System.Diagnostics;
 
namespace System.Data.Common.CommandTrees 
{
    ///  
    /// Represents a single-row update operation expressed as a canonical command tree.
    /// When the  property is set, the command returns a reader; otherwise,
    /// it returns a scalar indicating the number of rows affected.
    ///  
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public sealed class DbUpdateCommandTree : DbModificationCommandTree 
    { 
        private DbExpression _predicate;
        private DbExpression _returning; 
        IList _setClauses;

        internal DbUpdateCommandTree(MetadataWorkspace metadata, DataSpace dataSpace)
            : base(metadata, dataSpace) 
        {
        } 
 
        /// 
        /// Gets the list of update set clauses that define the update operation. 
        /// 
        public IList SetClauses
        {
            get 
            {
                return _setClauses; 
            } 
        }
 
        /// 
        /// Gets an  that specifies a projection of results to be returned based on the modified rows.
        /// If null, indicates no results should be returned from this command.
        ///  
        /// 
        /// The returning projection includes only the following elements: 
        ///  
        /// NewInstance expression
        /// Property expression 
        /// 
        /// 
        public DbExpression Returning
        { 
            get
            { 
                return _returning; 
            }
            internal set 
            {
                _returning = value;
            }
        } 

        ///  
        /// Gets an  that specifies the predicate used to determine which members of the target collection should be updated. 
        /// 
        ///  
        /// The predicate includes only the following elements:
        /// 
        /// Equality expression
        /// Constant expression 
        /// IsNull expression
        /// Property expression 
        /// Reference expression to the target 
        /// And expression
        /// Or expression 
        /// Not expression
        /// 
        /// 
        public DbExpression Predicate 
        {
            get 
            { 
                return _predicate;
            } 
            internal set
            {
                _predicate = value;
            } 
        }
 
        internal override DbCommandTreeKind CommandTreeKind 
        {
            get { return DbCommandTreeKind.Update; } 
        }

        internal override bool HasReader
        { 
            get { return null != Returning; }
        } 
 
        internal override void DumpStructure(ExpressionDumper dumper)
        { 
            base.DumpStructure(dumper);

            if (this.Predicate != null)
            { 
                dumper.Dump(this.Predicate, "Predicate");
            } 
 
            dumper.Begin("SetClauses", null);
            foreach (DbModificationClause clause in this.SetClauses) 
            {
                if (null != clause)
                {
                    clause.DumpStructure(dumper); 
                }
            } 
            dumper.End("SetClauses"); 

            dumper.Dump(this.Returning, "Returning"); 
        }

        internal override string PrintTree(ExpressionPrinter printer)
        { 
            return printer.Print(this);
        } 
 
        internal override void Replace(ExpressionReplacer replacer)
        { 
            using (new EntityBid.ScopeAuto(" %d#", this.ObjectId))
            {
                throw EntityUtil.NotSupported();
            } 
        }
 
        ///  
        /// Initializes set clauses on this command tree.
        ///  
        /// Set clauses.
        internal void InitializeSetClauses(List setClauses)
        {
            Debug.Assert(null != setClauses, "setClauses cannot be null"); 
            _setClauses = setClauses.AsReadOnly();
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 

using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal;
using System.Data.Common.Utils; 
using System.Diagnostics;
 
namespace System.Data.Common.CommandTrees 
{
    ///  
    /// Represents a single-row update operation expressed as a canonical command tree.
    /// When the  property is set, the command returns a reader; otherwise,
    /// it returns a scalar indicating the number of rows affected.
    ///  
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public sealed class DbUpdateCommandTree : DbModificationCommandTree 
    { 
        private DbExpression _predicate;
        private DbExpression _returning; 
        IList _setClauses;

        internal DbUpdateCommandTree(MetadataWorkspace metadata, DataSpace dataSpace)
            : base(metadata, dataSpace) 
        {
        } 
 
        /// 
        /// Gets the list of update set clauses that define the update operation. 
        /// 
        public IList SetClauses
        {
            get 
            {
                return _setClauses; 
            } 
        }
 
        /// 
        /// Gets an  that specifies a projection of results to be returned based on the modified rows.
        /// If null, indicates no results should be returned from this command.
        ///  
        /// 
        /// The returning projection includes only the following elements: 
        ///  
        /// NewInstance expression
        /// Property expression 
        /// 
        /// 
        public DbExpression Returning
        { 
            get
            { 
                return _returning; 
            }
            internal set 
            {
                _returning = value;
            }
        } 

        ///  
        /// Gets an  that specifies the predicate used to determine which members of the target collection should be updated. 
        /// 
        ///  
        /// The predicate includes only the following elements:
        /// 
        /// Equality expression
        /// Constant expression 
        /// IsNull expression
        /// Property expression 
        /// Reference expression to the target 
        /// And expression
        /// Or expression 
        /// Not expression
        /// 
        /// 
        public DbExpression Predicate 
        {
            get 
            { 
                return _predicate;
            } 
            internal set
            {
                _predicate = value;
            } 
        }
 
        internal override DbCommandTreeKind CommandTreeKind 
        {
            get { return DbCommandTreeKind.Update; } 
        }

        internal override bool HasReader
        { 
            get { return null != Returning; }
        } 
 
        internal override void DumpStructure(ExpressionDumper dumper)
        { 
            base.DumpStructure(dumper);

            if (this.Predicate != null)
            { 
                dumper.Dump(this.Predicate, "Predicate");
            } 
 
            dumper.Begin("SetClauses", null);
            foreach (DbModificationClause clause in this.SetClauses) 
            {
                if (null != clause)
                {
                    clause.DumpStructure(dumper); 
                }
            } 
            dumper.End("SetClauses"); 

            dumper.Dump(this.Returning, "Returning"); 
        }

        internal override string PrintTree(ExpressionPrinter printer)
        { 
            return printer.Print(this);
        } 
 
        internal override void Replace(ExpressionReplacer replacer)
        { 
            using (new EntityBid.ScopeAuto(" %d#", this.ObjectId))
            {
                throw EntityUtil.NotSupported();
            } 
        }
 
        ///  
        /// Initializes set clauses on this command tree.
        ///  
        /// Set clauses.
        internal void InitializeSetClauses(List setClauses)
        {
            Debug.Assert(null != setClauses, "setClauses cannot be null"); 
            _setClauses = setClauses.AsReadOnly();
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DbUpdateCommandTree.cs source code in C# .NET

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