/// <summary> /// Clones this instance. /// </summary> /// <returns>The created object</returns> object ICloneable.Clone() { JetCommand clone = new JetCommand(); clone._Connection = this._Connection; clone._WrappedCommand = (DbCommand)((ICloneable)this._WrappedCommand).Clone(); return(clone); }
public DbCommand CreateCommand(string commandText, int?commandTimeout = null) { if (string.IsNullOrEmpty(commandText)) { // SqlCommand will complain if the command text is empty commandText = Environment.NewLine; } var command = new JetCommand(commandText, this); if (commandTimeout.HasValue) { command.CommandTimeout = commandTimeout.Value; } return(command); }
/// <summary> /// Create a DbCommand object, given the provider manifest and command tree /// </summary> private DbCommand CreateCommand(DbProviderManifest manifest, DbCommandTree commandTree) { if (manifest == null) { throw new ArgumentNullException("manifest"); } if (commandTree == null) { throw new ArgumentNullException("commandTree"); } JetProviderManifest jetManifest = (manifest as JetProviderManifest); if (jetManifest == null) { throw new ArgumentException("The provider manifest given is not of type 'JetProviderManifest'."); } JetCommand command = new JetCommand(); List <DbParameter> parameters; CommandType commandType; command.CommandText = SqlGenerator.GenerateSql(commandTree, out parameters, out commandType); command.CommandType = commandType; //if (command.CommandType == CommandType.Text) // command.CommandText += Environment.NewLine + Environment.NewLine + "-- provider: " + this.GetType().Assembly.FullName; // Get the function (if any) implemented by the command tree since this influences our interpretation of parameters EdmFunction function = null; if (commandTree is DbFunctionCommandTree) { function = ((DbFunctionCommandTree)commandTree).EdmFunction; } // Now make sure we populate the command's parameters from the CQT's parameters: foreach (KeyValuePair <string, TypeUsage> queryParameter in commandTree.Parameters) { OleDbParameter parameter; // Use the corresponding function parameter TypeUsage where available (currently, the SSDL facets and // type trump user-defined facets and type in the EntityCommand). FunctionParameter functionParameter; if (function != null && function.Parameters.TryGetValue(queryParameter.Key, false, out functionParameter)) { parameter = CreateJetParameter(functionParameter.Name, functionParameter.TypeUsage, functionParameter.Mode, DBNull.Value); } else { parameter = CreateJetParameter(queryParameter.Key, queryParameter.Value, ParameterMode.In, DBNull.Value); } command.Parameters.Add(parameter); } // Now add parameters added as part of SQL gen (note: this feature is only safe for DML SQL gen which // does not support user parameters, where there is no risk of name collision) if (parameters != null && parameters.Count > 0) { if (!(commandTree is DbInsertCommandTree) && !(commandTree is DbUpdateCommandTree) && !(commandTree is DbDeleteCommandTree)) { throw new InvalidOperationException("SqlGenParametersNotPermitted"); } foreach (DbParameter parameter in parameters) { command.Parameters.Add(parameter); } } return(command); }