SqlCommand Constructors

Reference

Definition

Namespace:: System.Data.SqlClient

Assembly:: System.Data.SqlClient.dll

Assembly:: System.Data.dll

Assemblies:: netstandard.dll, System.Data.SqlClient.dll

Package:: System.Data.SqlClient v4.8.6

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Initializes a new instance of the SqlCommand class.

Overloads

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.

SqlCommand()

Initializes a new instance of the SqlCommand class.

public:
 SqlCommand();

public SqlCommand ();

Public Sub New ()

Examples

The following example creates a SqlCommand and sets the CommandTimeout property.

public void CreateSqlCommand()
{
   SqlCommand command = new SqlCommand();
   command.CommandTimeout = 15;
   command.CommandType = CommandType.Text;
}

Public Sub CreateSqlCommand()
    Dim command As New SqlCommand()
    command.CommandTimeout = 15
    command.CommandType = CommandType.Text
End Sub

Remarks

The base constructor initializes all fields to their default values. The following table shows initial property values for an instance of SqlCommand.

Properties	Initial value
CommandText	empty string ("")
CommandTimeout	30
CommandType	`CommandType.Text`
Connection	Null

You can change the value for any of these properties through a separate call to the property.

Applies to

SqlCommand(String)

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

public:
 SqlCommand(System::String ^ cmdText);

public SqlCommand (string cmdText);

new System.Data.SqlClient.SqlCommand : string -> System.Data.SqlClient.SqlCommand

Public Sub New (cmdText As String)

Parameters

cmdText: String

The text of the query.

Examples

The following example creates a SqlCommand, passing in the connection string and command text.

public void CreateCommand()
 {
    string queryString = "SELECT * FROM Categories ORDER BY CategoryID";
    SqlCommand command = new SqlCommand(queryString);
    command.CommandTimeout = 15;
    command.CommandType = CommandType.Text;
 }

Public Sub CreateCommand()
    Dim queryString As String = "SELECT * FROM Categories ORDER BY CategoryID"
    Dim command As New SqlCommand(queryString)
    command.CommandTimeout = 15
    command.CommandType = CommandType.Text
End Sub

Remarks

When an instance of SqlCommand is created, the following read/write properties are set to initial values.

Properties	Initial value
CommandText	`cmdText`
CommandTimeout	30
CommandType	`CommandType.Text`
Connection	null

You can change the value for any of these properties through a separate call to the property.

Applies to

SqlCommand(String, SqlConnection)

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

public:
 SqlCommand(System::String ^ cmdText, System::Data::SqlClient::SqlConnection ^ connection);

public SqlCommand (string cmdText, System.Data.SqlClient.SqlConnection connection);

new System.Data.SqlClient.SqlCommand : string * System.Data.SqlClient.SqlConnection -> System.Data.SqlClient.SqlCommand

Public Sub New (cmdText As String, connection As SqlConnection)

Parameters

cmdText: String

The text of the query.

connection: SqlConnection

A SqlConnection that represents the connection to an instance of SQL Server.

Examples

The following example creates a SqlCommand and sets some of its properties.

private static void CreateCommand(string queryString,
    string connectionString)
{
    using (SqlConnection connection = new SqlConnection(
               connectionString))
    {
        SqlCommand command = new SqlCommand(
            queryString, connection);
        connection.Open();
        SqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            Console.WriteLine(String.Format("{0}, {1}",
                reader[0], reader[1]));
        }
    }
}

Public Sub CreateCommand(ByVal queryString As String, _
  ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)

        connection.Open()
        Dim reader As SqlDataReader = command.ExecuteReader()
            While reader.Read()
            Console.WriteLine(String.Format("{0}, {1}", _
                reader(0), reader(1)))
        End While
    End Using
End Sub

Remarks

The following table shows initial property values for an instance of SqlCommand.

Properties	Initial value
CommandText	`cmdText`
CommandTimeout	30
CommandType	`CommandType.Text`
Connection	A new SqlConnection that is the value for the `connection` parameter.

You can change the value for any of these parameters by setting the related property.

Applies to

SqlCommand(String, SqlConnection, SqlTransaction)

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

public:
 SqlCommand(System::String ^ cmdText, System::Data::SqlClient::SqlConnection ^ connection, System::Data::SqlClient::SqlTransaction ^ transaction);

public SqlCommand (string cmdText, System.Data.SqlClient.SqlConnection connection, System.Data.SqlClient.SqlTransaction transaction);

new System.Data.SqlClient.SqlCommand : string * System.Data.SqlClient.SqlConnection * System.Data.SqlClient.SqlTransaction -> System.Data.SqlClient.SqlCommand

Public Sub New (cmdText As String, connection As SqlConnection, transaction As SqlTransaction)

Parameters

cmdText: String

The text of the query.

connection: SqlConnection

A SqlConnection that represents the connection to an instance of SQL Server.

transaction: SqlTransaction

The SqlTransaction in which the SqlCommand executes.

Remarks

The following table shows initial property values for an instance of SqlCommand.

Properties	Initial value
CommandText	`cmdText`
CommandTimeout	30
CommandType	`CommandType.Text`
Connection	A new SqlConnection that is the value for the `connection` parameter.

You can change the value for any of these parameters by setting the related property.

Applies to

SqlCommand(String, SqlConnection, SqlTransaction, SqlCommandColumnEncryptionSetting)

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

public:
 SqlCommand(System::String ^ cmdText, System::Data::SqlClient::SqlConnection ^ connection, System::Data::SqlClient::SqlTransaction ^ transaction, System::Data::SqlClient::SqlCommandColumnEncryptionSetting columnEncryptionSetting);

public SqlCommand (string cmdText, System.Data.SqlClient.SqlConnection connection, System.Data.SqlClient.SqlTransaction transaction, System.Data.SqlClient.SqlCommandColumnEncryptionSetting columnEncryptionSetting);

new System.Data.SqlClient.SqlCommand : string * System.Data.SqlClient.SqlConnection * System.Data.SqlClient.SqlTransaction * System.Data.SqlClient.SqlCommandColumnEncryptionSetting -> System.Data.SqlClient.SqlCommand

Public Sub New (cmdText As String, connection As SqlConnection, transaction As SqlTransaction, columnEncryptionSetting As SqlCommandColumnEncryptionSetting)

Parameters

cmdText: String

The text of the query.

connection: SqlConnection

A SqlConnection that represents the connection to an instance of SQL Server.

transaction: SqlTransaction

The SqlTransaction in which the SqlCommand executes.

columnEncryptionSetting: SqlCommandColumnEncryptionSetting

The encryption setting. For more information, see Always Encrypted.

Applies to

Megosztás a következőn keresztül:

SqlCommand Constructors

Definition

Overloads

SqlCommand()

Examples

Remarks

See also

Applies to

SqlCommand(String)

Parameters

Examples

Remarks

See also

Applies to

SqlCommand(String, SqlConnection)

Parameters

Examples

Remarks

See also

Applies to

SqlCommand(String, SqlConnection, SqlTransaction)

Parameters

Remarks

See also

Applies to

SqlCommand(String, SqlConnection, SqlTransaction, SqlCommandColumnEncryptionSetting)

Parameters

Applies to

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