UniDataAdapter Class

Represents a set of data commands and a database connection that are used to fill the DataSet and update a database.

For a list of all members of this type, see UniDataAdapter members.

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DataAdapter
            System.Data.Common.DbDataAdapter
               Devart.Common.DbDataAdapter
                  Devart.Data.Universal.UniDataAdapter

Syntax

[Visual Basic]
Public Class UniDataAdapter 
   Inherits DbDataAdapter

[C#]
public class UniDataAdapter : DbDataAdapter

Remarks

The UniDataAdapter serves as a bridge between a DataSet and database for retrieving and saving data. The UniDataAdapter provides this bridge by using Fill to load data from the database into the DataSet, and using Update to send changes made in the DataSet back to the database.

UniDataAdapter is used in conjunction with UniConnection and UniCommand to increase performance when connecting to a server.

The UniDataAdapter also includes the UniDataAdapter.SelectCommand, UniDataAdapter.InsertCommand, UniDataAdapter.DeleteCommand, UniDataAdapter.UpdateCommand, and TableMappings properties to facilitate loading and updating of data.

Example

The following example demonstrates how to retrieve and manipulate data using UniDataAdapter.

[C#]

public void UseDataAdapter(UniConnection myConnection) 
{ 
  UniDataAdapter myAdapter = new UniDataAdapter("SELECT DeptNo, DName FROM Test.Dept", myConnection); 
  myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey; 
  DataSet myDataSet = new DataSet(); 
  myAdapter.Fill(myDataSet,"Departments"); 
  object[] rowVals = new object[2]; 
  rowVals[0] = 40; 
  rowVals[1] = "Operations"; 
  myDataSet.Tables["Departments"].Rows.Add(rowVals); 
  myAdapter.InsertCommand = new UniCommand("INSERT INTO Test.Dept (DeptNo, DName) " + 
    "VALUES (:DeptNo, :DName)", myConnection); 
  myAdapter.InsertCommand.Parameters.Add("DeptNo", UniDbType.Int, 0, "DeptNo"); 
  myAdapter.InsertCommand.Parameters.Add("DName", UniDbType.VarChar, 15, "DName"); 
  myAdapter.Update(myDataSet,"Departments");  
  //Get all data from all tables within the dataset 
  foreach(DataTable myTable in myDataSet.Tables) 
  { 
    foreach(DataRow myRow in myTable.Rows) 
    { 
      foreach (DataColumn myColumn in myTable.Columns) 
      { 
        Console.Write(myRow[myColumn]+"\t"); 
      } 
      Console.WriteLine(); 
    } 
    Console.WriteLine(); 
  } 
}

[Visual Basic]

Public Sub UseDataAdapter(ByVal myConnection As UniConnection)
   Dim myAdapter As UniDataAdapter = New UniDataAdapter("SELECT DeptNo, DName FROM Test.Dept", myConnection)
   myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
   Dim myDataSet As DataSet = New DataSet
   myAdapter.Fill(myDataSet, "Departments")
   Dim rowVals(1) As Object
   rowVals(0) = "40"
   rowVals(1) = "Operations"
   myDataSet.Tables("Departments").Rows.Add(rowVals)
   myAdapter.InsertCommand = New UniCommand("INSERT INTO Test.Dept (DeptNo, DName) " & _
       "VALUES (:DeptNo, :DName)", myConnection)
   myAdapter.InsertCommand.Parameters.Add("DeptNo", UniDbType.Int, 0, "DeptNo")
   myAdapter.InsertCommand.Parameters.Add("DName", UniDbType.VarChar, 15, "DName")
   myAdapter.Update(myDataSet, "Departments")
   Dim myTable As DataTable
   Dim myRow As DataRow
   Dim myColumn As DataColumn
   ' Get all data from all tables within the dataset
   For Each myTable In myDataSet.Tables
     For Each myRow In myTable.Rows
       For Each myColumn In myTable.Columns
         Console.Write(myRow(myColumn) & Chr(9))
       Next myColumn
       Console.WriteLine()
     Next myRow
     Console.WriteLine()
   Next myTable
 End Sub

See Also

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