SqlCeDataReader.Seek Method

Articolo
10/16/2007

Note: This namespace, class, or member is supported only in version 1.1 of the .NET Framework.

Places the SqlCeDataReader on the record with indexed values that match the specified parameters.

  [Visual Basic]
  Public Sub Seek( _
   ByVal 
  dbSeekOptions
   As DbSeekOptions, _
   ByVal ParamArray index() As Object _
)
[C#]
public void Seek(DbSeekOptions dbSeekOptions,
   params object[] index
);
[C++]
public: void Seek(DbSeekOptions dbSeekOptions,Object* index __gc[]
);
[JScript]
public function Seek(
   dbSeekOptions : DbSeekOptions,
 index : Object[]
);

Parameters

dbSeekOptions
index

Return Value

Exceptions

Exception Type	Condition
SqlCeException	The value was not found, or other error.

Remarks

This method is intended to be a faster alternative to a SELECT statement for retrieving a row from a base table. Instead of a WHERE clause in a SELECT statement, Seek can be used to quickly retrieve a row based on its index value. For example, to retrieve an employee with an employee ID of 5, you could execute a SELECT statement, but using Seek with a value of 5 on the employee ID index will greatly improve performance.

Seek can only be used when CommandType is set to TableDirect, CommandText is set to a valid base table name, and IndexName is set to a valid index name on the specified base table.

After using Seek, SqlCeDataReader will return the remaining rows in their index order. When Seek is used on a SqlCeDataReader that has a range specified by SetRange, Seek will only position on rows within the range. For more information, see the "IRowsetIndex::Seek" topic in the OLE DB documentation.

Requirements

Platforms: .NET Compact Framework

.NET Framework Security:

Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries From Partially Trusted Code

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