ערוך

שתף באמצעות


SqlCommand Class

Definition

Represents a Transact-SQL statement or stored procedure to execute against a SQL Server database. This class cannot be inherited.

public ref class SqlCommand sealed : System::Data::Common::DbCommand
public ref class SqlCommand sealed : System::ComponentModel::Component, ICloneable, IDisposable, System::Data::IDbCommand
public ref class SqlCommand sealed : System::Data::Common::DbCommand, ICloneable
public sealed class SqlCommand : System.Data.Common.DbCommand
public sealed class SqlCommand : System.ComponentModel.Component, ICloneable, IDisposable, System.Data.IDbCommand
public sealed class SqlCommand : System.Data.Common.DbCommand, ICloneable
type SqlCommand = class
    inherit DbCommand
type SqlCommand = class
    inherit Component
    interface IDbCommand
    interface IDisposable
    interface ICloneable
type SqlCommand = class
    inherit DbCommand
    interface ICloneable
Public NotInheritable Class SqlCommand
Inherits DbCommand
Public NotInheritable Class SqlCommand
Inherits Component
Implements ICloneable, IDbCommand, IDisposable
Public NotInheritable Class SqlCommand
Inherits DbCommand
Implements ICloneable
Inheritance
SqlCommand
Inheritance
Inheritance
Implements

Examples

The following example creates a SqlConnection, a SqlCommand, and a SqlDataReader. The example reads through the data, writing it to the console. Finally, the example closes the SqlDataReader and then the SqlConnection as it exits the Using code blocks.

private static void ReadOrderData(string connectionString)
{
    string queryString =
        "SELECT OrderID, CustomerID FROM dbo.Orders;";
    using (SqlConnection connection = new SqlConnection(
               connectionString))
    {
        SqlCommand command = new SqlCommand(
            queryString, connection);
        connection.Open();
        using(SqlDataReader reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                Console.WriteLine(String.Format("{0}, {1}",
                    reader[0], reader[1]));
            }
        }
    }
}
Public Sub ReadOrderData(ByVal connectionString As String)
    Dim queryString As String = _
        "SELECT OrderID, CustomerID FROM dbo.Orders;"
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)
        connection.Open()
        Dim reader As SqlDataReader = command.ExecuteReader()
        Try
            While reader.Read()
                Console.WriteLine(String.Format("{0}, {1}", _
                    reader(0), reader(1)))
            End While
        Finally
            ' Always call Close when done reading.
            reader.Close()
        End Try
    End Using
End Sub

The following sample shows how to create and execute different types of SqlCommand objects.

First you must create the sample database, by executing the following script:

USE [master]
GO

CREATE DATABASE [MySchool]
GO

USE [MySchool]
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE procedure [dbo].[CourseExtInfo] @CourseId int
as
select c.CourseID,c.Title,c.Credits,d.Name as DepartmentName
from Course as c left outer join Department as d on c.DepartmentID=d.DepartmentID
where c.CourseID=@CourseId

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create procedure [dbo].[DepartmentInfo] @DepartmentId int,@CourseCount int output
as
select @CourseCount=Count(c.CourseID)
from course as c
where c.DepartmentID=@DepartmentId

select d.DepartmentID,d.Name,d.Budget,d.StartDate,d.Administrator
from Department as d
where d.DepartmentID=@DepartmentId

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Create PROCEDURE [dbo].[GetDepartmentsOfSpecifiedYear]
@Year int,@BudgetSum money output
AS
BEGIN
        SELECT @BudgetSum=SUM([Budget])
  FROM [MySchool].[dbo].[Department]
  Where YEAR([StartDate])=@Year

SELECT [DepartmentID]
      ,[Name]
      ,[Budget]
      ,[StartDate]
      ,[Administrator]
  FROM [MySchool].[dbo].[Department]
  Where YEAR([StartDate])=@Year

END
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Course]([CourseID] [nvarchar](10) NOT NULL,
[Year] [smallint] NOT NULL,
[Title] [nvarchar](100) NOT NULL,
[Credits] [int] NOT NULL,
[DepartmentID] [int] NOT NULL,
 CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED
(
[CourseID] ASC,
[Year] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Department]([DepartmentID] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL,
[Budget] [money] NOT NULL,
[StartDate] [datetime] NOT NULL,
[Administrator] [int] NULL,
 CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED
(
[DepartmentID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Person]([PersonID] [int] IDENTITY(1,1) NOT NULL,
[LastName] [nvarchar](50) NOT NULL,
[FirstName] [nvarchar](50) NOT NULL,
[HireDate] [datetime] NULL,
[EnrollmentDate] [datetime] NULL,
 CONSTRAINT [PK_School.Student] PRIMARY KEY CLUSTERED
(
[PersonID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[StudentGrade]([EnrollmentID] [int] IDENTITY(1,1) NOT NULL,
[CourseID] [nvarchar](10) NOT NULL,
[StudentID] [int] NOT NULL,
[Grade] [decimal](3, 2) NOT NULL,
 CONSTRAINT [PK_StudentGrade] PRIMARY KEY CLUSTERED
(
[EnrollmentID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create view [dbo].[EnglishCourse]
as
select c.CourseID,c.Title,c.Credits,c.DepartmentID
from Course as c join Department as d on c.DepartmentID=d.DepartmentID
where d.Name=N'English'

GO
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C1045', 2012, N'Calculus', 4, 7)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C1061', 2012, N'Physics', 4, 1)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C2021', 2012, N'Composition', 3, 2)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C2042', 2012, N'Literature', 4, 2)
SET IDENTITY_INSERT [dbo].[Department] ON

INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (1, N'Engineering', 350000.0000, CAST(0x0000999C00000000 AS DateTime), 2)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (2, N'English', 120000.0000, CAST(0x0000999C00000000 AS DateTime), 6)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (4, N'Economics', 200000.0000, CAST(0x0000999C00000000 AS DateTime), 4)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (7, N'Mathematics', 250024.0000, CAST(0x0000999C00000000 AS DateTime), 3)
SET IDENTITY_INSERT [dbo].[Department] OFF
SET IDENTITY_INSERT [dbo].[Person] ON

INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (1, N'Hu', N'Nan', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (2, N'Norman', N'Laura', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (3, N'Olivotto', N'Nino', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (4, N'Anand', N'Arturo', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (5, N'Jai', N'Damien', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (6, N'Holt', N'Roger', CAST(0x000097F100000000 AS DateTime), NULL)
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (7, N'Martin', N'Randall', CAST(0x00008B1A00000000 AS DateTime), NULL)
SET IDENTITY_INSERT [dbo].[Person] OFF
SET IDENTITY_INSERT [dbo].[StudentGrade] ON

INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (1, N'C1045', 1, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (2, N'C1045', 2, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (3, N'C1045', 3, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (4, N'C1045', 4, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (5, N'C1045', 5, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (6, N'C1061', 1, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (7, N'C1061', 3, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (8, N'C1061', 4, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (9, N'C1061', 5, CAST(1.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (10, N'C2021', 1, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (11, N'C2021', 2, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (12, N'C2021', 4, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (13, N'C2021', 5, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (14, N'C2042', 1, CAST(2.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (15, N'C2042', 2, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (16, N'C2042', 3, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (17, N'C2042', 5, CAST(3.00 AS Decimal(3, 2)))
SET IDENTITY_INSERT [dbo].[StudentGrade] OFF
ALTER TABLE [dbo].[Course]  WITH CHECK ADD  CONSTRAINT [FK_Course_Department] FOREIGN KEY([DepartmentID])
REFERENCES [dbo].[Department] ([DepartmentID])
GO
ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department]
GO
ALTER TABLE [dbo].[StudentGrade]  WITH CHECK ADD  CONSTRAINT [FK_StudentGrade_Student] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Person] ([PersonID])
GO
ALTER TABLE [dbo].[StudentGrade] CHECK CONSTRAINT [FK_StudentGrade_Student]
GO

Next, compile and execute the following:

using System;
using System.Data;
using System.Data.SqlClient;
using System.Threading.Tasks;

class Program {

   static class SqlHelper {
      // Set the connection, command, and then execute the command with non query.
      public static Int32 ExecuteNonQuery(String connectionString, String commandText,
          CommandType commandType, params SqlParameter[] parameters) {
         using (SqlConnection conn = new SqlConnection(connectionString)) {
            using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
               // There're three command types: StoredProcedure, Text, TableDirect. The TableDirect
               // type is only for OLE DB.
               cmd.CommandType = commandType;
               cmd.Parameters.AddRange(parameters);

               conn.Open();
               return cmd.ExecuteNonQuery();
            }
         }
      }

      // Set the connection, command, and then execute the command and only return one value.
      public static Object ExecuteScalar(String connectionString, String commandText,
          CommandType commandType, params SqlParameter[] parameters) {
         using (SqlConnection conn = new SqlConnection(connectionString)) {
            using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
               cmd.CommandType = commandType;
               cmd.Parameters.AddRange(parameters);

               conn.Open();
               return cmd.ExecuteScalar();
            }
         }
      }

      // Set the connection, command, and then execute the command with query and return the reader.
      public static SqlDataReader ExecuteReader(String connectionString, String commandText,
          CommandType commandType, params SqlParameter[] parameters) {
         SqlConnection conn = new SqlConnection(connectionString);

         using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
            cmd.CommandType = commandType;
            cmd.Parameters.AddRange(parameters);

            conn.Open();
            // When using CommandBehavior.CloseConnection, the connection will be closed when the
            // IDataReader is closed.
            SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

            return reader;
         }
      }
   }

   static void Main(string[] args) {
      String connectionString = "Data Source=(local);Initial Catalog=MySchool;Integrated Security=True;Asynchronous Processing=true;";

      CountCourses(connectionString, 2012);
      Console.WriteLine();

      Console.WriteLine("Following result is the departments that started from 2007:");
      GetDepartments(connectionString, 2007);
      Console.WriteLine();

      Console.WriteLine("Add the credits when the credits of course is lower than 4.");
      AddCredits(connectionString, 4);
      Console.WriteLine();

      Console.WriteLine("Please press any key to exit...");
      Console.ReadKey();
   }

   static void CountCourses(String connectionString, Int32 year) {
      String commandText = "Select Count([CourseID]) FROM [MySchool].[dbo].[Course] Where Year=@Year";
      SqlParameter parameterYear = new SqlParameter("@Year", SqlDbType.Int);
      parameterYear.Value = year;

      Object oValue = SqlHelper.ExecuteScalar(connectionString, commandText, CommandType.Text, parameterYear);
      Int32 count;
      if (Int32.TryParse(oValue.ToString(), out count))
         Console.WriteLine("There {0} {1} course{2} in {3}.", count > 1 ? "are" : "is", count, count > 1 ? "s" : null, year);
   }

   // Display the Departments that start from the specified year.
   static void GetDepartments(String connectionString, Int32 year) {
      String commandText = "dbo.GetDepartmentsOfSpecifiedYear";

      // Specify the year of StartDate
      SqlParameter parameterYear = new SqlParameter("@Year", SqlDbType.Int);
      parameterYear.Value = year;

      // When the direction of parameter is set as Output, you can get the value after
      // executing the command.
      SqlParameter parameterBudget = new SqlParameter("@BudgetSum", SqlDbType.Money);
      parameterBudget.Direction = ParameterDirection.Output;

      using (SqlDataReader reader = SqlHelper.ExecuteReader(connectionString, commandText,
          CommandType.StoredProcedure, parameterYear, parameterBudget)) {
         Console.WriteLine("{0,-20}{1,-20}{2,-20}{3,-20}", "Name", "Budget", "StartDate",
             "Administrator");
         while (reader.Read()) {
            Console.WriteLine("{0,-20}{1,-20:C}{2,-20:d}{3,-20}", reader["Name"],
                reader["Budget"], reader["StartDate"], reader["Administrator"]);
         }
      }
      Console.WriteLine("{0,-20}{1,-20:C}", "Sum:", parameterBudget.Value);
   }

   // If credits of course is lower than the certain value, the method will add the credits.
   static void AddCredits(String connectionString, Int32 creditsLow) {
      String commandText = "Update [MySchool].[dbo].[Course] Set Credits=Credits+1 Where Credits<@Credits";

      SqlParameter parameterCredits = new SqlParameter("@Credits", creditsLow);

      Int32 rows = SqlHelper.ExecuteNonQuery(connectionString, commandText, CommandType.Text, parameterCredits);

      Console.WriteLine("{0} row{1} {2} updated.", rows, rows > 1 ? "s" : null, rows > 1 ? "are" : "is");
   }
}

Remarks

When an instance of SqlCommand is created, the read/write properties are set to their initial values. For a list of these values, see the SqlCommand constructor.

SqlCommand features the following methods for executing commands at a SQL Server database:

Item Description
BeginExecuteNonQuery Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand, generally executing commands such as INSERT, DELETE, UPDATE, and SET statements. Each call to BeginExecuteNonQuery must be paired with a call to EndExecuteNonQuery which finishes the operation, typically on a separate thread.
BeginExecuteReader Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand and retrieves one or more results sets from the server. Each call to BeginExecuteReader must be paired with a call to EndExecuteReader which finishes the operation, typically on a separate thread.
BeginExecuteXmlReader Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand. Each call to BeginExecuteXmlReader must be paired with a call to EndExecuteXmlReader, which finishes the operation, typically on a separate thread, and returns an XmlReader object.
ExecuteReader Executes commands that return rows. For increased performance, ExecuteReader invokes commands using the Transact-SQL sp_executesql system stored procedure. Therefore, ExecuteReader might not have the effect that you want if used to execute commands such as Transact-SQL SET statements.
ExecuteNonQuery Executes commands such as Transact-SQL INSERT, DELETE, UPDATE, and SET statements.
ExecuteScalar Retrieves a single value (for example, an aggregate value) from a database.
ExecuteXmlReader Sends the CommandText to the Connection and builds an XmlReader object.

You can reset the CommandText property and reuse the SqlCommand object. However, you must close the SqlDataReader before you can execute a new or previous command.

If a SqlException is generated by the method executing a SqlCommand, the SqlConnection remains open when the severity level is 19 or less. When the severity level is 20 or greater, the server ordinarily closes the SqlConnection. However, the user can reopen the connection and continue.

Note

Nameless, also called ordinal, parameters are not supported by the .NET Framework Data Provider for SQL Server.

Constructors

SqlCommand()

Initializes a new instance of the SqlCommand class.

SqlCommand(String)

Initializes a new instance of the SqlCommand class with the text of the query.

SqlCommand(String, SqlConnection)

Initializes a new instance of the SqlCommand class with the text of the query and a SqlConnection.

SqlCommand(String, SqlConnection, SqlTransaction)

Initializes a new instance of the SqlCommand class with the text of the query, a SqlConnection, and the SqlTransaction.

SqlCommand(String, SqlConnection, SqlTransaction, SqlCommandColumnEncryptionSetting)

Initializes a new instance of the SqlCommand class with specified command text, connection, transaction, and encryption setting.

Properties

CanRaiseEvents

Gets a value indicating whether the component can raise an event.

(Inherited from Component)
ColumnEncryptionSetting

Gets or sets the column encryption setting for this command.

CommandText

Gets or sets the Transact-SQL statement, table name or stored procedure to execute at the data source.

CommandTimeout

Gets or sets the wait time (in seconds) before terminating the attempt to execute a command and generating an error.

CommandType

Gets or sets a value indicating how the CommandText property is to be interpreted.

Connection

Gets or sets the SqlConnection used by this instance of the SqlCommand.

Container

Gets the IContainer that contains the Component.

(Inherited from Component)
DbConnection

Gets or sets the DbConnection used by this DbCommand.

(Inherited from DbCommand)
DbParameterCollection

Gets the collection of DbParameter objects.

(Inherited from DbCommand)
DbTransaction

Gets or sets the DbTransaction within which this DbCommand object executes.

(Inherited from DbCommand)
DesignMode

Gets a value that indicates whether the Component is currently in design mode.

(Inherited from Component)
DesignTimeVisible

Gets or sets a value indicating whether the command object should be visible in a Windows Form Designer control.

Events

Gets the list of event handlers that are attached to this Component.

(Inherited from Component)
Notification

Gets or sets a value that specifies the SqlNotificationRequest object bound to this command.

NotificationAutoEnlist

Gets or sets a value indicating whether the application should automatically receive query notifications from a common SqlDependency object.

Parameters

Gets the SqlParameterCollection.

Site

Gets or sets the ISite of the Component.

(Inherited from Component)
Transaction

Gets or sets the SqlTransaction within which the SqlCommand executes.

UpdatedRowSource

Gets or sets how command results are applied to the DataRow when used by the Update method of the DbDataAdapter.

Methods

BeginExecuteNonQuery()

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand.

BeginExecuteNonQuery(AsyncCallback, Object)

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand, given a callback procedure and state information.

BeginExecuteReader()

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand, and retrieves one or more result sets from the server.

BeginExecuteReader(AsyncCallback, Object)

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand and retrieves one or more result sets from the server, given a callback procedure and state information.

BeginExecuteReader(AsyncCallback, Object, CommandBehavior)

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand, using one of the CommandBehavior values, and retrieving one or more result sets from the server, given a callback procedure and state information.

BeginExecuteReader(CommandBehavior)

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand using one of the CommandBehavior values.

BeginExecuteXmlReader()

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand and returns results as an XmlReader object.

BeginExecuteXmlReader(AsyncCallback, Object)

Initiates the asynchronous execution of the Transact-SQL statement or stored procedure that is described by this SqlCommand and returns results as an XmlReader object, using a callback procedure.

Cancel()

Tries to cancel the execution of a SqlCommand.

Clone()

Creates a new SqlCommand object that is a copy of the current instance.

CreateDbParameter()

Creates a new instance of a DbParameter object.

(Inherited from DbCommand)
CreateObjRef(Type)

Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

(Inherited from MarshalByRefObject)
CreateParameter()

Creates a new instance of a SqlParameter object.

Dispose()

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

(Inherited from DbCommand)
Dispose()

Releases all resources used by the Component.

(Inherited from Component)
Dispose(Boolean)

Releases the unmanaged resources used by the DbCommand and optionally releases the managed resources.

(Inherited from DbCommand)
Dispose(Boolean)

Releases the unmanaged resources used by the Component and optionally releases the managed resources.

(Inherited from Component)
DisposeAsync()

Asynchronously diposes the command object.

(Inherited from DbCommand)
EndExecuteNonQuery(IAsyncResult)

Finishes asynchronous execution of a Transact-SQL statement.

EndExecuteReader(IAsyncResult)

Finishes asynchronous execution of a Transact-SQL statement, returning the requested SqlDataReader.

EndExecuteXmlReader(IAsyncResult)

Finishes asynchronous execution of a Transact-SQL statement, returning the requested data as XML.

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
ExecuteDbDataReader(CommandBehavior)

Executes the command against its connection, returning a DbDataReader which can be used to access the results.

(Inherited from DbCommand)
ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken)

Providers should implement this method to provide a non-default implementation for ExecuteReader overloads.

The default implementation invokes the synchronous ExecuteReader() method and returns a completed task, blocking the calling thread. The default implementation will return a cancelled task if passed an already cancelled cancellation token. Exceptions thrown by ExecuteReader will be communicated via the returned Task Exception property.

This method accepts a cancellation token that can be used to request the operation to be cancelled early. Implementations may ignore this request.

(Inherited from DbCommand)
ExecuteNonQuery()

Executes a Transact-SQL statement against the connection and returns the number of rows affected.

ExecuteNonQueryAsync()

An asynchronous version of ExecuteNonQuery(), which executes the command against its connection object, returning the number of rows affected.

Invokes ExecuteNonQueryAsync(CancellationToken) with CancellationToken.None.

(Inherited from DbCommand)
ExecuteNonQueryAsync(CancellationToken)

An asynchronous version of ExecuteNonQuery(), which executes a Transact-SQL statement against the connection and returns the number of rows affected. The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.

ExecuteNonQueryAsync(CancellationToken)

This is the asynchronous version of ExecuteNonQuery(). Providers should override with an appropriate implementation. The cancellation token may optionally be ignored.

The default implementation invokes the synchronous ExecuteNonQuery() method and returns a completed task, blocking the calling thread. The default implementation will return a cancelled task if passed an already cancelled cancellation token. Exceptions thrown by ExecuteNonQuery() will be communicated via the returned Task Exception property.

Do not invoke other methods and properties of the DbCommand object until the returned Task is complete.

(Inherited from DbCommand)
ExecuteReader()

Sends the CommandText to the Connection and builds a SqlDataReader.

ExecuteReader(CommandBehavior)

Sends the CommandText to the Connection, and builds a SqlDataReader using one of the CommandBehavior values.

ExecuteReaderAsync()

An asynchronous version of ExecuteReader(), which sends the CommandText to the Connection and builds a SqlDataReader. Exceptions will be reported via the returned Task object.

ExecuteReaderAsync()

An asynchronous version of ExecuteReader, which executes the command against its connection, returning a DbDataReader which can be used to access the results.

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken) with CancellationToken.None.

(Inherited from DbCommand)
ExecuteReaderAsync(CancellationToken)

An asynchronous version of ExecuteReader(), which sends the CommandText to the Connection and builds a SqlDataReader.

The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.

ExecuteReaderAsync(CancellationToken)

An asynchronous version of ExecuteReader, which executes the command against its connection, returning a DbDataReader which can be used to access the results.

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

(Inherited from DbCommand)
ExecuteReaderAsync(CommandBehavior)

An asynchronous version of ExecuteReader(CommandBehavior), which sends the CommandText to the Connection, and builds a SqlDataReader. Exceptions will be reported via the returned Task object.

ExecuteReaderAsync(CommandBehavior)

An asynchronous version of ExecuteReader, which executes the command against its connection, returning a DbDataReader which can be used to access the results.

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

(Inherited from DbCommand)
ExecuteReaderAsync(CommandBehavior, CancellationToken)

An asynchronous version of ExecuteReader(CommandBehavior), which sends the CommandText to the Connection, and builds a SqlDataReader

The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.

ExecuteReaderAsync(CommandBehavior, CancellationToken)

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

(Inherited from DbCommand)
ExecuteScalar()

Executes the query, and returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

ExecuteScalarAsync()

An asynchronous version of ExecuteScalar(), which executes the command and returns the first column of the first row in the first returned result set. All other columns, rows and result sets are ignored.

Invokes ExecuteScalarAsync(CancellationToken) with CancellationToken.None.

(Inherited from DbCommand)
ExecuteScalarAsync(CancellationToken)

An asynchronous version of ExecuteScalar(), which executes the query asynchronously and returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.

ExecuteScalarAsync(CancellationToken)

This is the asynchronous version of ExecuteScalar(). Providers should override with an appropriate implementation. The cancellation token may optionally be ignored.

The default implementation invokes the synchronous ExecuteScalar() method and returns a completed task, blocking the calling thread. The default implementation will return a cancelled task if passed an already cancelled cancellation token. Exceptions thrown by ExecuteScalar will be communicated via the returned Task Exception property.

Do not invoke other methods and properties of the DbCommand object until the returned Task is complete.

(Inherited from DbCommand)
ExecuteXmlReader()

Sends the CommandText to the Connection and builds an XmlReader object.

ExecuteXmlReaderAsync()

An asynchronous version of ExecuteXmlReader(), which sends the CommandText to the Connection and builds an XmlReader object.

Exceptions will be reported via the returned Task object.

ExecuteXmlReaderAsync(CancellationToken)

An asynchronous version of ExecuteXmlReader(), which sends the CommandText to the Connection and builds an XmlReader object.

The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. Exceptions will be reported via the returned Task object.

GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetLifetimeService()
Obsolete.

Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
GetService(Type)

Returns an object that represents a service provided by the Component or by its Container.

(Inherited from Component)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
InitializeLifetimeService()
Obsolete.

Obtains a lifetime service object to control the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
MemberwiseClone(Boolean)

Creates a shallow copy of the current MarshalByRefObject object.

(Inherited from MarshalByRefObject)
Prepare()

Creates a prepared version of the command on an instance of SQL Server.

PrepareAsync(CancellationToken)

Asynchronously creates a prepared (or compiled) version of the command on the data source.

(Inherited from DbCommand)
ResetCommandTimeout()

Resets the CommandTimeout property to its default value.

ToString()

Returns a string that represents the current object.

(Inherited from Object)
ToString()

Returns a String containing the name of the Component, if any. This method should not be overridden.

(Inherited from Component)

Events

Disposed

Occurs when the component is disposed by a call to the Dispose() method.

(Inherited from Component)
StatementCompleted

Occurs when the execution of a Transact-SQL statement completes.

Explicit Interface Implementations

ICloneable.Clone()

Creates a new SqlCommand object that is a copy of the current instance.

IDbCommand.Connection

Gets or sets the IDbConnection used by this instance of the IDbCommand.

(Inherited from DbCommand)
IDbCommand.CreateParameter()

Creates a new instance of a SqlParameter object.

IDbCommand.CreateParameter()

Creates a new instance of an IDbDataParameter object.

(Inherited from DbCommand)
IDbCommand.ExecuteReader()

Sends the CommandText to the Connection, and builds a SqlDataReader.

IDbCommand.ExecuteReader()

Executes the CommandText against the Connection and builds an IDataReader.

(Inherited from DbCommand)
IDbCommand.ExecuteReader(CommandBehavior)

Sends the CommandText to the Connection, and builds a SqlDataReader using one of the CommandBehavior values.

IDbCommand.ExecuteReader(CommandBehavior)

Executes the CommandText against the Connection, and builds an IDataReader using one of the CommandBehavior values.

(Inherited from DbCommand)
IDbCommand.Parameters

Gets the IDataParameterCollection.

(Inherited from DbCommand)
IDbCommand.Transaction

Gets or sets the DbTransaction within which this DbCommand object executes.

(Inherited from DbCommand)

Applies to

See also