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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.oledb.oledbcommand below:

OleDbCommand Class (System.Data.OleDb) | Microsoft Learn

Represents an SQL statement or stored procedure to execute against a data source.

public ref class OleDbCommand sealed : System::Data::Common::DbCommand, ICloneable, IDisposable

public ref class OleDbCommand sealed : System::ComponentModel::Component, ICloneable, IDisposable, System::Data::IDbCommand

public ref class OleDbCommand sealed : System::Data::Common::DbCommand, ICloneable

public sealed class OleDbCommand : System.Data.Common.DbCommand, ICloneable, IDisposable

public sealed class OleDbCommand : System.ComponentModel.Component, ICloneable, IDisposable, System.Data.IDbCommand

public sealed class OleDbCommand : System.Data.Common.DbCommand, ICloneable

type OleDbCommand = class
    inherit DbCommand
    interface IDbCommand
    interface IDisposable
    interface ICloneable

type OleDbCommand = class
    inherit Component
    interface ICloneable
    interface IDbCommand
    interface IDisposable

type OleDbCommand = class
    inherit DbCommand
    interface ICloneable
    interface IDbCommand
    interface IDisposable

Public NotInheritable Class OleDbCommand
Inherits DbCommand
Implements ICloneable, IDisposable

Public NotInheritable Class OleDbCommand
Inherits Component
Implements ICloneable, IDbCommand, IDisposable

Public NotInheritable Class OleDbCommand
Inherits DbCommand
Implements ICloneable

Inheritance

Inheritance

Inheritance

Implements

The following example uses the OleDbCommand, along OleDbDataAdapter and OleDbConnection, to select rows from an Access database. The filled DataSet is then returned. The example is passed an initialized DataSet, a connection string, a query string that is an SQL SELECT statement, and a string that is the name of the source database table.

public void ReadMyData(string connectionString)
{
    string queryString = "SELECT OrderID, CustomerID FROM Orders";
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            Console.WriteLine(reader.GetInt32(0) + ", " + reader.GetString(1));
        }
        // always call Close when done reading.
        reader.Close();
    }
}

Public Sub ReadMyData(ByVal connectionString As String)
    Dim queryString As String = "SELECT OrderID, CustomerID FROM Orders"
    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand(queryString, connection)

        connection.Open()

        Dim reader As OleDbDataReader = command.ExecuteReader()
        While reader.Read()
            Console.WriteLine(reader.GetInt32(0).ToString() + ", " _
               + reader.GetString(1))
        End While

        ' always call Close when done reading.
        reader.Close()
    End Using
End Sub

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

OleDbCommand features the following methods executing commands at a data source:

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

If a fatal OleDbException (for example, a SQL Server severity level of 20 or greater) is generated by the method executing an OleDbCommand, the OleDbConnection, the connection may be closed. However, the user can reopen the connection and continue.

Tries to cancel the execution of an OleDbCommand.

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

Creates a new instance of a DbParameter object.

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

Creates a new instance of an OleDbParameter object.

Releases all resources used by the Component.

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

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

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

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.

Executes an SQL statement against the Connection and returns the number of rows affected.

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.

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.

Sends the CommandText to the Connection and builds an OleDbDataReader.

Sends the CommandText to the Connection, and builds an OleDbDataReader using one of the CommandBehavior values.

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

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

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

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

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

Invokes ExecuteDbDataReaderAsync(CommandBehavior, CancellationToken).

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.

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.

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.

Serves as the default hash function.

Obsolete.

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

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

Gets the Type of the current instance.

Obsolete.

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

Creates a shallow copy of the current Object.

Creates a shallow copy of the current MarshalByRefObject object.

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

Resets the CommandTimeout property to the default value.

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

• OleDbDataAdapter
• OleDbConnection
• Working with Commands

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