dotConnect for Oracle Documentation
Devart.Data.Oracle Namespace / OracleDataTable Class
Members Example

In This Topic
    OracleDataTable Class
    In This Topic
    Represents a single object that provides all of the functionality needed to retrieve and manipulate data from an Oracle data source.

    The OracleDataTable class extends the Devart.Common.DbDataTable class to provide a single object that can be used to access and update data from a data source. Actually, OracleDataTable replaces OracleConnection, OracleCommand, OracleDataAdapter, and OracleCommandBuilder classes with all-in-one class. When a OracleDataTable object is created, the default values of its constituent parts are set to reasonable defaults, meaning that the programmer can create a single object and immediately use it to retrieve and manipulate data from a data source.

    By using OracleDataTable you can avoid explicit creation of OracleConnection and OracleCommand objects. When appropriate form of constructor is used, these objects are created automatically when you retrieve data from a data source. It allows you to cut down the size of the written code.

    OracleDataTable allows you to automate loading of subsets of data either by selecting Devart.Common.DbTable.StartRecord and MaxRecords properties or by using Fill or FillPage methods that support passing parameter values into the query text.

    The OracleDataTable class is designed to employ both connected and disconnected data access models. It also provides functionality for asynchronous fill operations.

    The OracleDataTable class can be fully adjusted at design-time. You may retrieve data at design-time from a data source by setting Devart.Common.DbTable.Active property to true.

    For more information on advanced features of OracleDataTable please refer to topic OracleDataTable Advanced Features.

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

    Note: This class is not available in .NET Standard 1.3 compatible assembly. It is available only in the assembly for full .NET Framework and .NET Standard 2.0/2.1 compatible assemblies.

    This class is available only in Professional and Developer Editions. It is not available in Standard and Mobile Editions.

    ExecutePageReader method puts on following restrictions on the executable statement:

    - you cannot execute stored procedures and PL/SQL blocks;

    - you may specify only SQL statement that can be placed into the subquery.

    To use ExecutePageReader method it is recommended to optimize a query for retrieving a first row, otherwise using this method is ineffective.

    Note that OracleDataTable supports advanced data binding for such Oracle objects as nested tables, varrays, and Oracle objects. Use DataSource and DataMember properties of DataGrid to render OracleTable, OracleArray, and OracleObject objects.

    This sample shows easiness of use of OracleDataTable. The sample creates a OracleDataTable object, passing it SQL query text and connection string, retrieves data from a table and modifies it. Content of the table is printed to console then. Notice that no other component needs to be created by programmer.
    public void UseDataTable()
      OracleDataTable myDataTable = new OracleDataTable("SELECT * FROM Test.Dept", 
          "User Id=Scott;Password=tiger;Data Source=Ora;");
        myDataTable.FetchAll = true;
            myDataTable.Active = true;
        myDataTable.Rows[3]["DName"] = "Researches";
        Console.WriteLine(myDataTable.Update()+" rows updated.");
        foreach(DataRow myRow in myDataTable.Rows)
          foreach(DataColumn myCol in myDataTable.Columns)
        myDataTable.Active = false;
    Public Sub UseDataTable()
      Dim myDataTable As OracleDataTable = New OracleDataTable("SELECT * FROM Test.Dept", _
          "User Id=Scott;Password=tiger;Data Source=Ora;")
        myDataTable.FetchAll = True
            myDataTable.Active = True
        myDataTable.Rows(3)("DName") = "Researches"
        Console.WriteLine(myDataTable.Update() & " rows updated.")
        Dim myRow As DataRow
        Dim myCol As DataColumn
        For Each myRow In myDataTable.Rows
          For Each myCol In myDataTable.Columns
            Console.Write(myRow(myCol) & Chr(9))
          Next myCol
        Next myRow
        myDataTable.Active = False
      End Try
    End Sub
    Inheritance Hierarchy



    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

    See Also