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I just want to verify something. I believe it is likely that if I apply the using command to a SqlDataReader, that it will both close the data reader and dispose of it. For example:
Using sdr As SqlDataReader = cm.ExecuteReader()
Dim someInt As Integer = sdr.GetInt32(0)
'other details and actions
End Using
Will that close the sdr SqlDataReader after it exits the Using code block. (I believe it will, but just want to verify.)
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The SqlDataReader is used to read a row of record at a time which is got using SqlCommand. It is read only, which means we can only read the record; it can not be edited. And also it is forward only, which means you can not go back to a previous row (record).
You must explicitly call the Close method when you are through using the SqlDataReader to use the associated SqlConnection for any other purpose.
A SqlDataAdapter is typically used to fill a DataSet or DataTable and so you will have access to the data after your connection has been closed (disconnected access). The SqlDataReader is a fast forward-only and connected cursor which tends to be generally quicker than filling a DataSet/DataTable.
As explained earlier, the SqlDataReader returns data via a sequential stream. To read this data, you must pull data from a table row-by-row Once a row has been read, the previous row is no longer available.
Yes. Using calls IDisposable.Dispose, and the MSDN page on SqlDataReader.Dispose says:
SqlDataReader.Dispose Method
Releases the resources used by the DbDataReader and calls Close.
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Yes, the reader will be closed when it is disposed. From the SqlDataReader.Dispose documentation:
Releases the resources used by the DbDataReader and calls Close.
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