Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityClient / EntityParameter.cs / 1305376 / EntityParameter.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Text; using System.Data; using System.Data.Common; using System.Data.Common.CommandTrees; using System.Data.Common.Internal; using System.Data.Metadata.Edm; using System.Text.RegularExpressions; using System.Diagnostics; namespace System.Data.EntityClient { ////// Class representing a parameter used in EntityCommand /// public sealed partial class EntityParameter : DbParameter, IDbDataParameter { private string _parameterName; private DbType? _dbType; private byte? _precision; private byte? _scale; private bool _isDirty; ////// Constructs the EntityParameter object /// public EntityParameter() { } ////// Constructs the EntityParameter object with the given parameter name and the type of the parameter /// /// The name of the parameter /// The type of the parameter public EntityParameter(string parameterName, DbType dbType) { SetParameterNameWithValidation(parameterName, "parameterName"); this.DbType = dbType; } ////// Constructs the EntityParameter object with the given parameter name, the type of the parameter, and the size of the /// parameter /// /// The name of the parameter /// The type of the parameter /// The size of the parameter public EntityParameter(string parameterName, DbType dbType, int size) { SetParameterNameWithValidation(parameterName, "parameterName"); this.DbType = dbType; this.Size = size; } ////// Constructs the EntityParameter object with the given parameter name, the type of the parameter, the size of the /// parameter, and the name of the source column /// /// The name of the parameter /// The type of the parameter /// The size of the parameter /// The name of the source column mapped to the data set, used for loading the parameter value public EntityParameter(string parameterName, DbType dbType, int size, string sourceColumn) { SetParameterNameWithValidation(parameterName, "parameterName"); this.DbType = dbType; this.Size = size; this.SourceColumn = sourceColumn; } ////// Constructs the EntityParameter object with the given parameter name, the type of the parameter, the size of the /// parameter, and the name of the source column /// /// The name of the parameter /// The type of the parameter /// The size of the parameter /// The direction of the parameter, whether it's input/output/both/return value /// If the parameter is nullable /// The floating point precision of the parameter, valid only if the parameter type is a floating point type /// The scale of the parameter, valid only if the parameter type is a floating point type /// The name of the source column mapped to the data set, used for loading the parameter value /// The data row version to use when loading the parameter value /// The value of the parameter public EntityParameter(string parameterName, DbType dbType, int size, ParameterDirection direction, bool isNullable, byte precision, byte scale, string sourceColumn, DataRowVersion sourceVersion, object value) { SetParameterNameWithValidation(parameterName, "parameterName"); this.DbType = dbType; this.Size = size; this.Direction = direction; this.IsNullable = isNullable; this.Precision = precision; this.Scale = scale; this.SourceColumn = sourceColumn; this.SourceVersion = sourceVersion; this.Value = value; } ////// The name of the parameter /// public override string ParameterName { get { return this._parameterName ?? ""; } set { SetParameterNameWithValidation(value, "value"); } } ////// Helper method to validate the parameter name; Ideally we'd only call this once, but /// we have to put an argumentName on the Argument exception, and the property setter would /// need "value" which confuses folks when they call the constructor that takes the value /// of the parameter. c'est la vie. /// /// /// private void SetParameterNameWithValidation(string parameterName, string argumentName) { if (!string.IsNullOrEmpty(parameterName) && !DbCommandTree.IsValidParameterName(parameterName)) { throw EntityUtil.Argument(System.Data.Entity.Strings.EntityClient_InvalidParameterName(parameterName), argumentName); } PropertyChanging(); this._parameterName = parameterName; } ////// The type of the parameter /// public override DbType DbType { get { // If the user hasn't set the DbType, then we deduce it from the value, but we won't set it in the // member field as it's used to keep track of what the user set explicitly if (!this._dbType.HasValue) { // If we can't deduce the type as there are no values, just assume it's string type if (_value == null) return DbType.String; try { return TypeHelpers.ConvertClrTypeToDbType(_value.GetType()); } catch (ArgumentException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_CannotDeduceDbType, e); } } return (DbType)this._dbType; } set { PropertyChanging(); this._dbType = value; } } ////// The precision of the parameter if the parameter is a floating point type /// public byte Precision { get { byte result = this._precision.HasValue ? this._precision.Value : (byte)0; return result; } set { PropertyChanging(); this._precision = value; } } ////// The scale of the parameter if the parameter is a floating point type /// public byte Scale { get { byte result = this._scale.HasValue ? this._scale.Value : (byte)0; return result; } set { PropertyChanging(); this._scale = value; } } ////// The value of the parameter /// public override object Value { get { return this._value; } set { // If the user hasn't set the DbType, then we have to figure out if the DbType will change as a result // of the change in the value. What we want to achieve is that changes to the value will not cause // it to be dirty, but changes to the value that causes the apparent DbType to change, then should be // dirty. if (!this._dbType.HasValue) { // If the value is null, then we assume it's string type DbType oldDbType = DbType.String; if (_value != null) { oldDbType = TypeHelpers.ConvertClrTypeToDbType(_value.GetType()); } // If the value is null, then we assume it's string type DbType newDbType = DbType.String; if (value != null) { newDbType = TypeHelpers.ConvertClrTypeToDbType(value.GetType()); } if (oldDbType != newDbType) { PropertyChanging(); } } this._value = value; } } ////// Gets whether this collection has been changes since the last reset /// internal bool IsDirty { get { return _isDirty; } } ////// Indicates whether the DbType property has been set by the user; /// internal bool IsDbTypeSpecified { get { return this._dbType.HasValue; } } ////// Indicates whether the Direction property has been set by the user; /// internal bool IsDirectionSpecified { get { return this._direction != 0; } } ////// Indicates whether the IsNullable property has been set by the user; /// internal bool IsIsNullableSpecified { get { return this._isNullable.HasValue; } } ////// Indicates whether the Precision property has been set by the user; /// internal bool IsPrecisionSpecified { get { return this._precision.HasValue; } } ////// Indicates whether the Scale property has been set by the user; /// internal bool IsScaleSpecified { get { return this._scale.HasValue; } } ////// Indicates whether the Size property has been set by the user; /// internal bool IsSizeSpecified { get { return this._size.HasValue; } } ////// Resets the DbType property to its original settings /// public override void ResetDbType() { if (_dbType != null) { PropertyChanging(); } _dbType = null; } ////// Clones this parameter object /// ///The new cloned object internal EntityParameter Clone() { return new EntityParameter(this); } ////// Clones this parameter object /// ///The new cloned object private void CloneHelper(EntityParameter destination) { CloneHelperCore(destination); destination._parameterName = _parameterName; destination._dbType = _dbType; destination._precision = _precision; destination._scale = _scale; } ////// Marks that this parameter has been changed /// private void PropertyChanging() { _isDirty = true; } ////// Determines the size of the given object /// /// ///private int ValueSize(object value) { return ValueSizeCore(value); } /// /// Get the type usage for this parameter in model terms. /// ///The type usage for this parameter //NOTE: Because GetTypeUsage throws CommandValidationExceptions, it should only be called from EntityCommand during command execution internal TypeUsage GetTypeUsage() { TypeUsage typeUsage; if (!DbTypeMap.TryGetModelTypeUsage(this.DbType, out typeUsage)) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_UnsupportedDbType(this.DbType.ToString(), ParameterName)); } Debug.Assert(typeUsage != null, "DbType.TryGetModelTypeUsage returned true for null TypeUsage?"); return typeUsage; } ////// Reset the dirty flag on the collection /// internal void ResetIsDirty() { _isDirty = false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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