如何获得更新记录数的计数（*）

Question

i am updating a sql server 2008 database using c# like this:

foreach (DataRow row in dt.Rows)
{
    faxstatus = row.ItemArray[5].ToString().Contains("0000") ? "Faxed" : "Error";

    query = 
        @"update FileLog set
        FaxStatus=" + "'" + faxstatus + "'," +
        "FaxedPageCount=" + "'" + row.ItemArray[1] + "'," +
        "dtFaxed=" + "'" + row.ItemArray[2] + "'," +
        "BiscomCode=" + "'" + row.ItemArray[5] + "', " +
        "RetryCount=" + "'" + row.ItemArray[4] + "' " +
        "where CONVERT(VARCHAR(255), JobID) =" + "'" + row.ItemArray[3] + "'" +
        " and FaxStatus<>'Faxed'";

    command = new SqlCommand(query, myConnection);
    command.ExecuteNonQuery();
    NumberOfRecordsUpdated++;

}

i would like to know whether it is possible to return how many records were updated?

Answer 1

Yes. Use ExecuteNonQuery 's return value. :-)

Quoting ExecuteNonQuery 's documentation :

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command.

Answer 2

Capture and use the result of ExecuteNonQuery to an integer. That method returns the number of records affected by the operation.

See SqlCommand.ExecuteNonQuery Method .

That being said, how much do you trust your datasource? Enough to bet your data integrity on it? I'd be remissed if I didn't implore you to explore parameterized queries. A using statement would also be warranted so that your disposable resources ( SqlConnection , SqlCommand , etc.) are properly dealt with.

Answer 3

Refering to SqlCommand.ExecuteNonQuery Method :

Return Value
Type: System.Int32
The number of rows affected.

Answer 4

将SELECT @@ROWCOUNT附加到您的语句，并使用ExecuteScalar而不是ExecuteNoneQuery 。

Answer 5

您可以使用@@ ROWCOUNT 。