SQLiteCommand Class

In This Topic

Represents a SQL statement to execute against SQLite.

Syntax

Visual Basic
C#

'Declaration
 
Public Class SQLiteCommand 
   Inherits Devart.Common.DbCommandBase
   Implements System.ComponentModel.IComponent, System.Data.IDbCommand, System.ICloneable, System.IDisposable

public class SQLiteCommand : Devart.Common.DbCommandBase, System.ComponentModel.IComponent, System.Data.IDbCommand, System.ICloneable, System.IDisposable

Remarks

The SQLiteCommand class provides the following methods for executing commands against the SQLite database:

Item	Description
ExecuteReader	Executes commands that return rows.
ExecutePageReader	Returns a specific subset of rows when paging through the results of a query.
ExecuteNonQuery	Executes SQL commands such as INSERT, DELETE, UPDATE.
ExecuteScalar	Retrieves a single value (for example, an aggregate value) from a data source.

If execution of the command results in a fatal SQLiteException, the SQLiteConnection may close. However, the user can reopen the connection and continue.

This class supports cross-form data binding with the InterForm Technology.

Example

The following example uses the ExecuteReader method of SQLiteCommand, along with SQLiteDataReader and SQLiteConnection, to select rows from a table.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Dept";
  SQLiteConnection sqConnection = new SQLiteConnection(myConnString);
  SQLiteCommand sqCommand = new SQLiteCommand(mySelectQuery,sqConnection);
  sqConnection.Open();
  SQLiteDataReader sqReader = sqCommand.ExecuteReader();
  try
  {
    while (sqReader.Read())
    {
      Console.WriteLine(sqReader.GetInt32(0).ToString() + ", " + sqReader.GetString(1));
    }
  }
  finally
  {
  // always call Close when done reading.
  sqReader.Close();
  // always call Close when done reading.
  sqConnection.Close();
  }
}

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Dept"
  Dim sqConnection As New SQLiteConnection(myConnString)
  Dim sqCommand As New SQLiteCommand(mySelectQuery, sqConnection)
  sqConnection.Open()
  Dim sqReader As SQLiteDataReader = sqCommand.ExecuteReader()
  Try
    While sqReader.Read()
      Console.WriteLine(sqReader.GetInt32(0).ToString() + ", " _
        + sqReader.GetString(1))
    End While
  Finally
      ' always call Close when done reading.
      sqReader.Close()
      ' always call Close when done with connection.
      sqConnection.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbCommand
            Devart.Common.DbCommandBase
               Devart.Data.SQLite.SQLiteCommand

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

SQLiteCommand Members
Devart.Data.SQLite Namespace
SQLiteDataReader Class
SQLiteConnection Class

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