OracleDataAdapter Class

An OracleDataAdapter object represents a data provider object that populates the DataSet and updates changes in the DataSet to the Oracle database.

Class Inheritance

Object

  MarshalByRefObject

    Component

      DataAdapter

        DbDataAdapter

          OracleDataAdapter

Declaration

// C#
public sealed class OracleDataAdapter : DbDataAdapter, IDbDataAdapter

Thread Safety

All public static methods are thread-safe, although instance methods do not guarantee thread safety.

Example

The following example uses the OracleDataAdapter and the dataset to update the EMP table:

// C#
 
using System;
using System.Data;
using Oracle.DataAccess.Client;
 
class OracleDataAdapterSample
{
  static void Main()
  {
    string constr = "User Id=scott;Password=tiger;Data Source=oracle";
    string cmdstr = "SELECT empno, sal from emp";
 
    // Create the adapter with the selectCommand txt and the
    // connection string
    OracleDataAdapter adapter = new OracleDataAdapter(cmdstr, constr);
 
    // Create the builder for the adapter to automatically generate
    // the Command when needed
    OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
 
    // Create and fill the DataSet using the EMP
    DataSet dataset = new DataSet();
    adapter.Fill(dataset, "EMP");
 
    // Get the EMP table from the dataset
    DataTable table = dataset.Tables["EMP"];
 
    // Indicate DataColumn EMPNO is unique
    // This is required by the OracleCommandBuilder to update the EMP table
    table.Columns["EMPNO"].Unique = true;
 
    // Get the first row from the EMP table
    DataRow row = table.Rows[0];
 
    // Update the salary
    double sal = double.Parse(row["SAL"].ToString());
    row["SAL"] = sal + .01;
 
    // Now update the EMP using the adapter
    // The OracleCommandBuilder will create the UpdateCommand for the
    // adapter to update the EMP table
    adapter.Update(dataset, "EMP");
 
    Console.WriteLine("Row updated successfully");
  }
}

Requirements

Namespace: Oracle.DataAccess.Client

Assembly: Oracle.DataAccess.dll


See Also:

OracleDataAdapter Members

OracleDataAdapter members are listed in the following tables:

OracleDataAdapter Constructors

OracleDataAdapter constructors are listed in Table 5-29.

Table 5-29 OracleDataAdapter Constructors

Constructor Description
OracleDataAdapter Constructors Instantiates a new instance of OracleDataAdapter class (Overloaded)

OracleDataAdapter Static Methods

The OracleDataAdapter static method is listed in Table 5-30.

Table 5-30 OracleDataAdapter Static Method

Method Description
Equals Inherited from Object (Overloaded)

OracleDataAdapter Properties

OracleDataAdapter properties are listed in Table 5-31.

Table 5-31 OracleDataAdapter Properties

Name Description
AcceptChangesDuringFill Inherited from DataAdapter
Container Inherited from Component
ContinueUpdateOnError Inherited from DataAdapter
DeleteCommand A SQL statement or stored procedure to delete rows from an Oracle database
InsertCommand A SQL statement or stored procedure to insert new rows into an Oracle database
MissingMappingAction Inherited from DataAdapter
MissingSchemaAction Inherited from DataAdapter
Requery Determines whether or not the SelectCommand is reexecuted on the next call to Fill
SafeMapping Creates a mapping between column names in the result set to .NET types, to preserve the data
SelectCommand A SQL statement or stored procedure that returns a single or multiple result set
Site Inherited from Component
TableMappings Inherited from DataAdapter
UpdateCommand A SQL statement or stored procedure to update rows from the DataSet to an Oracle database

OracleDataAdapter Public Methods

OracleDataAdapter public methods are listed in Table 5-32.

Table 5-32 OracleDataAdapter Public Methods

Public Method Description
CreateObjRef Inherited from MarshalByRefObject
Dispose Inherited from Component
Equals Inherited from Object (Overloaded)
Fill Adds or refreshes rows in the DataSet to match the data in the Oracle database (Overloaded)
FillSchema Inherited from DbDataAdapter
GetFillParameters Inherited from DbDataAdapter
GetHashCode Inherited from Object
GetLifetimeService Inherited from MarshalByRefObject
GetType Inherited from Object
InitializeLifetimeService Inherited from MarshalByRefObject
ToString Inherited from Object
Update Inherited from DbDataAdapter

OracleDataAdapter Events

OracleDataAdapter events are listed in Table 5-33.

Table 5-33 OracleDataAdapter Events

Event Name Description
Disposed Inherited from Component
FillError Inherited from DbDataAdapter
RowUpdated This event is raised when row(s) have been updated by the Update() method
RowUpdating This event is raised when row data are about to be updated to the database

OracleDataAdapter Constructors

OracleDataAdapter constructors create new instances of an OracleDataAdapter class.

Overload List:


See Also:

OracleDataAdapter()

This constructor creates an instance of an OracleDataAdapter class with no arguments.

Declaration

// C#
public OracleDataAdapter();

Remarks

Initial values are set for the following OracleDataAdapter properties as indicated:

  • MissingMappingAction = MissingMappingAction.Passthrough

  • MissingSchemaAction = MissingSchemaAction.Add


See Also:

OracleDataAdapter(OracleCommand)

This constructor creates an instance of an OracleDataAdapter class with the provided OracleCommand as the SelectCommand.

Declaration

// C#
public OracleDataAdapter(OracleCommand selectCommand);

Parameters

  • selectCommand

    The OracleCommand that is to be set as the SelectCommand property.

Remarks

Initial values are set for the following OracleDataAdapter properties as indicated:

  • MissingMappingAction = MissingMappingAction.Passthrough

  • MissingSchemaAction = MissingSchemaAction.Add


See Also:

OracleDataAdapter(string, OracleConnection)

This constructor creates an instance of an OracleDataAdapter class with the provided OracleConnection object and the command text for the SelectCommand.

Declaration

// C#
public OracleDataAdapter(string selectCommandText, OracleConnection
    selectConnection);

Parameters

  • selectCommandText

    The string that is set as the CommandText of the SelectCommand property of the OracleDataAdapter.

  • selectConnection

    The OracleConnection to connect to the Oracle database.

Remarks

The OracleDataAdapter opens and closes the connection, if it is not already open. If the connection is open, it must be explicitly closed.

Initial values are set for the following OracleDataAdapter properties as indicated:

  • MissingMappingAction = MissingMappingAction.Passthrough

  • MissingSchemaAction = MissingSchemaAction.Add


See Also:

OracleDataAdapter(string, string)

This constructor creates an instance of an OracleDataAdapter class with the provided connection string and the command text for the SelectCommand.

Declaration

// C#
public OracleDataAdapter(string selectCommandText, string
   selectConnectionString);

Parameters

  • selectCommandText

    The string that is set as the CommandText of the SelectCommand property of the OracleDataAdapter.

  • selectConnectionString

    The connection string.

Remarks

Initial values are set for the following OracleDataAdapter properties as indicated:

  • MissingMappingAction = MissingMappingAction.Passthrough

  • MissingSchemaAction = MissingSchemaAction.Add


See Also:

OracleDataAdapter Static Methods

The OracleDataAdapter static method is listed in Table 5-34.

Table 5-34 OracleDataAdapter Static Method

Method Description
Equals Inherited from Object (Overloaded)


See Also:

OracleDataAdapter Properties

OracleDataAdapter properties are listed in Table 5-35.

Table 5-35 OracleDataAdapter Properties

Name Description
AcceptChangesDuringFill Inherited from DataAdapter
Container Inherited from Component
ContinueUpdateOnError Inherited from DataAdapter
DeleteCommand A SQL statement or stored procedure to delete rows from an Oracle database
InsertCommand A SQL statement or stored procedure to insert new rows into an Oracle database
MissingMappingAction Inherited from DataAdapter
MissingSchemaAction Inherited from DataAdapter
Requery Determines whether or not the SelectCommand is reexecuted on the next call to Fill
SafeMapping Creates a mapping between column names in the result set to .NET types, to preserve the data
SelectCommand A SQL statement or stored procedure that returns a single or multiple result set
Site Inherited from Component
TableMappings Inherited from DataAdapter
UpdateCommand A SQL statement or stored procedure to update rows from the DataSet to an Oracle database


See Also:

DeleteCommand

This property is a SQL statement or stored procedure to delete rows from an Oracle database.

Declaration

// C#
public OracleCommand DeleteCommand {get; set;}

Property Value

An OracleCommand used during the Update call to delete rows from tables in the Oracle database, corresponding to the deleted rows in the DataSet.

Remarks

Default = null

If there is primary key information in the DataSet, the DeleteCommand can be automatically generated using the OracleCommandBuilder, if no command is provided for this.


See Also:

InsertCommand

This property is a SQL statement or stored procedure to insert new rows into an Oracle database.

Declaration

// C#
public OracleCommand InsertCommand {get; set;}

Property Value

An OracleCommand used during the Update call to insert rows into a table, corresponding to the inserted rows in the DataSet.

Remarks

Default = null

If there is primary key information in the DataSet, the InsertCommand can be automatically generated using the OracleCommandBuilder, if no command is provided for this property.


See Also:

Requery

This property determines whether or not the SelectCommand is reexecuted on the next call to Fill.

Declaration

// C#
public Boolean Requery {get; set;}

Property Value

Returns true if the SelectCommand is reexecuted on the next call to Fill; otherwise, returns false.


See Also:

SafeMapping

This property creates a mapping between column names in the result set to .NET types that represent column values in the DataSet, to preserve the data.

Declaration

// C#
public Hashtable SafeMapping {get; set;}

Property Value

A hash table.

Remarks

Default = null

The SafeMapping property is used, when necessary, to preserve data in the following types:

  • DATE

  • TimeStamp (refers to all TimeStamp objects)

  • INTERVAL DAY TO SECOND

  • NUMBER

Example

See the example in "OracleDataAdapter Safe Type Mapping".


See Also:

SelectCommand

This property is a SQL statement or stored procedure that returns single or multiple result sets.

Declaration

// C#
public OracleCommand SelectCommand {get; set;}

Property Value

An OracleCommand used during the Fill call to populate the selected rows to the DataSet.

Remarks

Default = null

If the SelectCommand does not return any rows, no tables are added to the dataset and no exception is raised.

If the SELECT statement selects from a VIEW, no key information is retrieved when a FillSchema() or a Fill() with MissingSchemaAction.AddWithKey is invoked.


See Also:

UpdateCommand

This property is a SQL statement or stored procedure to update rows from the DataSet to an Oracle database.

Declaration

// C#
public OracleCommand UpdateCommand {get; set;}

Property Value

An OracleCommand used during the Update call to update rows in the Oracle database, corresponding to the updated rows in the DataSet.

Remarks

Default = null

If there is primary key information in the DataSet, the UpdateCommand can be automatically generated using the OracleCommandBuilder, if no command is provided for this property.


See Also:

OracleDataAdapter Public Methods

OracleDataAdapter public methods are listed in Table 5-36.

Table 5-36 OracleDataAdapter Public Methods

Public Method Description
CreateObjRef Inherited from MarshalByRefObject
Dispose Inherited from Component
Equals Inherited from Object (Overloaded)
Fill Adds or refreshes rows in the DataSet to match the data in the Oracle database (Overloaded)
FillSchema Inherited from DbDataAdapter
GetFillParameters Inherited from DbDataAdapter
GetHashCode Inherited from Object
GetLifetimeService Inherited from MarshalByRefObject
GetType Inherited from Object
InitializeLifetimeService Inherited from MarshalByRefObject
ToString Inherited from Object
Update Inherited from DbDataAdapter


See Also:

Fill

Fill populates or refreshes the specified DataTable or DataSet.

Overload List:


See Also:

Fill(DataTable, OracleRefCursor)

This method adds or refreshes rows in the specified DataTable to match those in the provided OracleRefCursor object.

Declaration

// C#
public int Fill(DataTable dataTable, OracleRefCursor refCursor);

Parameters

  • dataTable

    The DataTable object being populated.

  • refCursor

    The OracleRefCursor that rows are being retrieved from.

Return Value

The number of rows added to or refreshed in the DataTable.

Exceptions

ArgumentNullException - The dataTable or refCursor parameter is null.

InvalidOperationException - The OracleRefCursor is already being used to fetch data.

NotSupportedException - The SafeMapping type is not supported.

Remarks

No schema or key information is provided, even if the Fill method is called with MissingSchemaAction set to MissingSchemaAction.AddWithKey.


See Also:

Fill(DataSet, OracleRefCursor)

This method adds or refreshes rows in the DataSet to match those in the provided OracleRefCursor object.

Declaration

// C#
public int Fill(DataSet dataSet, OracleRefCursor refCursor);

Parameters

  • dataSet

    The DataSet object being populated.

  • refCursor

    The OracleRefCursor that rows are being retrieved from.

Return Value

Returns the number of rows added or refreshed in the DataSet.

Exceptions

ArgumentNullException - The dataSet or refCursor parameter is null.

InvalidOperationException - The OracleRefCursor is already being used to fetch data.

InvalidOperationException - The OracleRefCursor is ready to fetch data.

NotSupportedException - The SafeMapping type is not supported.

Remarks

If there is no DataTable to refresh, a new DataTable named Table is created and populated using the provided OracleRefCursor object.

No schema or key information is provided, even if the Fill method is called with MissingSchemaAction set to MissingSchemaAction.AddWithKey.


See Also:

Fill(DataSet, string, OracleRefCursor)

This method adds or refreshes rows in the specified source table of the DataSet to match those in the provided OracleRefCursor object.

Declaration

// C#
public int Fill(DataSet dataSet, string srcTable, OracleRefCursor
   refCursor);

Parameters

  • dataSet

    The DataSet object being populated.

  • srcTable

    The name of the source table used in the table mapping.

  • refCursor

    The OracleRefCursor that rows are being retrieved from.

Return Value

Returns the number of rows added or refreshed into the DataSet.

Exceptions

ArgumentNullException - The dataSet or refCursor parameter is null.

InvalidOperationException - The OracleRefCursor is already being used to fetch data or the source table name is invalid.

NotSupportedException - The SafeMapping type is not supported.

Remarks

No schema or key information is provided, even if the Fill method is called with MissingSchemaAction set to MissingSchemaAction.AddWithKey.


See Also:

Fill(DataSet, int, int, string, OracleRefCursor)

This method adds or refreshes rows in a specified range in the DataSet to match rows in the provided OracleRefCursor object.

Declaration

// C#
public int Fill(DataSet dataSet, int startRecord, int maxRecords, 
   string srcTable, OracleRefCursor refCursor);

Parameters

  • dataSet

    The DataSet object being populated.

  • startRecord

    The record number to start with.

  • maxRecords

    The maximum number of records to obtain.

  • srcTable

    The name of the source table used in the table mapping.

  • refCursor

    The OracleRefCursor that rows are being retrieved from.

Return Value

This method returns the number of rows added or refreshed in the DataSet. This does not include rows affected by statements that do not return rows.

Exceptions

ArgumentNullException - The dataSet or refCursor parameter is null.

InvalidOperationException - The OracleRefCursor is already being used to fetch data or the source table name is invalid.

NotSupportedException - The SafeMapping type is not supported.

Remarks

No schema or key information is provided, even if the Fill method is called with MissingSchemaAction set to MissingSchemaAction.AddWithKey.


See Also:

OracleDataAdapter Events

OracleDataAdapter events are listed in Table 5-37.

Table 5-37 OracleDataAdapter Events

Event Name Description
Disposed Inherited from Component
FillError Inherited from DbDataAdapter
RowUpdated This event is raised when row(s) have been updated by the Update() method
RowUpdating This event is raised when row data are about to be updated to the database


See Also:

RowUpdated

This event is raised when row(s) have been updated by the Update() method.

Declaration

// C#
public event OracleRowUpdatedEventHandler RowUpdated;

Event Data

The event handler receives an OracleRowUpdatedEventArgs object which exposes the following properties containing information about the event.

  • Command

    The OracleCommand executed during the Update.

  • Errors (inherited from RowUpdatedEventArgs)

    The exception, if any, is generated during the Update.

  • RecordsAffected (inherited from RowUpdatedEventArgs)

    The number of rows modified, inserted, or deleted by the execution of the Command.

  • Row (inherited from RowUpdatedEventArgs)

    The DataRow sent for Update.

  • StatementType (inherited from RowUpdatedEventArgs)

    The type of SQL statement executed.

  • Status (inherited from RowUpdatedEventArgs)

    The UpdateStatus of the Command.

  • TableMapping (inherited from RowUpdatedEventArgs)

    The DataTableMapping used during the Update.

Example

The following example shows how to use the RowUpdating and RowUpdated events.

// C#
 
using System;
using System.Data;
using Oracle.DataAccess.Client;
 
class RowUpdatedSample
{
  // Event handler for RowUpdating event
  protected static void OnRowUpdating(object sender, 
                                      OracleRowUpdatingEventArgs e)
  {
    Console.WriteLine("Row updating.....");
    Console.WriteLine("Event arguments:");
    Console.WriteLine("Command Text: " + e.Command.CommandText);
    Console.WriteLine("Command Type: " + e.StatementType);
    Console.WriteLine("Status: " + e.Status);
  }
 
  // Event handler for RowUpdated event
  protected static void OnRowUpdated(object sender, 
                                     OracleRowUpdatedEventArgs e)
  {
    Console.WriteLine("Row updated.....");
    Console.WriteLine("Event arguments:");
    Console.WriteLine("Command Text: " + e.Command.CommandText);
    Console.WriteLine("Command Type: " + e.StatementType);
    Console.WriteLine("Status: " + e.Status);
  }
 
  static void Main()
  {
    string constr = "User Id=scott;Password=tiger;Data Source=oracle";
    string cmdstr = "SELECT EMPNO, ENAME, SAL FROM EMP";
 
    // Create the adapter with the selectCommand txt and the
    // connection string
    OracleDataAdapter adapter = new OracleDataAdapter(cmdstr, constr);
 
    // Create the builder for the adapter to automatically generate
    // the Command when needed
    OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
 
    // Create and fill the DataSet using the EMP
    DataSet dataset = new DataSet();
    adapter.Fill(dataset, "EMP");
 
    // Get the EMP table from the dataset
    DataTable table = dataset.Tables["EMP"];
 
    // Indicate DataColumn EMPNO is unique
    // This is required by the OracleCommandBuilder to update the EMP table
    table.Columns["EMPNO"].Unique = true;
 
    // Get the first row from the EMP table
    DataRow row = table.Rows[0];
 
    // Update the salary
    double sal = double.Parse(row["SAL"].ToString());
    row["SAL"] = sal + .01;
 
    // Set the event handlers for the RowUpdated and the RowUpdating event
    // the OnRowUpdating() method will be triggered before the update, and
    // the OnRowUpdated() method will be triggered after the update
    adapter.RowUpdating += new OracleRowUpdatingEventHandler(OnRowUpdating);
    adapter.RowUpdated += new OracleRowUpdatedEventHandler(OnRowUpdated);
 
    // Now update the EMP using the adapter
    // The OracleCommandBuilder will create the UpdateCommand for the
    // adapter to update the EMP table
    // The OnRowUpdating() and the OnRowUpdated() methods will be triggered
    adapter.Update(dataset, "EMP");
  }
}

See Also:

RowUpdating

This event is raised when row data are about to be updated to the database.

Declaration

// C#
public event OracleRowUpdatingEventHandler RowUpdating;

Event Data

The event handler receives an OracleRowUpdatingEventArgs object which exposes the following properties containing information about the event.

  • Command

    The OracleCommand executed during the Update.

  • Errors (inherited from RowUpdatingEventArgs)

    The exception, if any, is generated during the Update.

  • Row (inherited from RowUpdatingEventArgs)

    The DataRow sent for Update.

  • StatementType (inherited from RowUpdatingEventArgs)

    The type of SQL statement executed.

  • Status (inherited from RowUpdatingEventArgs)

    The UpdateStatus of the Command.

  • TableMapping (inherited from RowUpdatingEventArgs)

    The DataTableMapping used during the Update.

Example

The example for the RowUpdated event also shows how to use the RowUpdating event. See RowUpdated event "Example".


See Also: