|
Octomber 11, 2011
DataAdapter is an integral part of the ADO.NET Data Provider. DataAdapter provides
the means of communication between the Dataset and the Datasource. We can use the
DataAdapter in combination with the DataSet Object. DataAdapter object is used in
dis-connected architecture as it automatically open yhe connection and closes after
data operation is completed.
DataAdapter provides this combination by mapping Fill method, which changes the
data in the DataSet to match the data in the data source, and Update, which changes
the data in the data source to match the data in the DataSet.
The DataAdapter can be used to perform insert, update and Delete operations in the
datasource.
SqlDataAdapter da = new SqlDataAdapter();
da.Fill(ds);
The SqlDataAdapter Object and DataSet objects are combine to perform both data access
and data manipulation operations in the SQL Server Database.
Different DataAdapter in ADO.net:
- System.Data.SqlClient.SqlDataAdapter
- System.Data.OleDb.OleDbDataAdapter
- Oracle.OracleClient.OracleDataAdapter
DataAdapter Properties:
DeleteCommand:
Represents a DELETE statement or stored procedure for deleting records from the
data source
da.DeleteCommand.CommandText ="Delete from table_name where Condition";
InsertCommand:
Represents a INSERT statement or stored procedure for inserting records from the
data source.
da.InsertCommand.CommandText ="Insert into table_name values(values1,Values2);
SelectCommand: Represents a SELECT statement or stored procedure for selecting records from the data source
da.SelectCommand.CommandText ="select * from table_name";
Update Command: Represents a UPDATE statement or stored procedure for updating records from the data source
da.UpdateCommand.CommandText ="update table_name set column_name= value where Condition";
TableMappings: Represents a collection of mappings between actual data source table and a DataTable object
DataAdapter Methods:
Fill:
Fill method is used to fill data into Dataset or Datatable using DataAdapter.
Update:
Update method updates data to the datasource.
FillSchema:
Update method adds a DataTable to a DataSet.
Sample Code (SQL):
SqlConnection conn = new SqlConnection("");
SqlCommand com = new SqlCommand("select * from ", conn);
SqlDataAdapter da = new SqlDataAdapter(com);
DataSet ds=new DataSet();
da.Fill(ds);
|