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DataAdapter

ADO.NET component that bridges a data source and a DataSet From Wikipedia, the free encyclopedia

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In ADO.NET, a data adapter (DataAdapter) is an object that acts as a bridge between a data source and a disconnected in-memory data representation such as a DataSet, enabling data to be retrieved into the DataSet and later written back to the data source.[1][2]

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Overview

The DataAdapter is an abstract base class in the System.Data.Common namespace; provider-specific implementations (such as for SQL Server, OLE DB, or ODBC) typically derive from DbDataAdapter.[1][3] Data adapters are used with the ADO.NET disconnected model, where an application loads data into a memory-resident DataSet (including related tables, constraints, and relationships) and later reconciles changes back to the underlying data source.[4]

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Operation

Filling a DataSet

A DataAdapter populates a DataSet (or DataTable) through its Fill method, using its SelectCommand to retrieve rows from the data source.[5]

Updating the data source

A DataAdapter can persist changes made in the DataSet back to the data source using Update; it applies INSERT, UPDATE and DELETE operations as appropriate based on changes tracked in the DataSet, using command objects such as InsertCommand, UpdateCommand and DeleteCommand.[6]

Schema and table mappings

Data adapters can also configure a DataSet's schema from the data source (for example, using FillSchema) and can map source table names to DataTable names through table mappings.[7][3]

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Implementations

Provider-specific data adapters include:

  • SqlDataAdapter for Microsoft SQL Server (System.Data.SqlClient)[8]
  • OleDbDataAdapter for OLE DB data sources (System.Data.OleDb)[9]
  • OdbcDataAdapter for ODBC data sources (System.Data.Odbc)[10]

A DataSet can be filled and updated using multiple DataAdapter instances, and can contain related tables originating from different data sources exposed through different providers.[11]

See also

References

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