C# problem Access database

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C#

OleDbConnection h5 = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\\users\\IJC Database.accdb");
            OleDbCommand cmd5;
            h5.Open();
            cmd5 = new OleDbCommand("select MAX(ID) from ijc"+";",h5);
            cmd5.ExecuteNonQuery();

how can i take the result from cmd5 command and give this result to variable.

Posted 24-Jun-13 7:59am

loai_maane

Updated 24-Jun-13 8:02am

Ron Beyer

v2

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2 solutions

Solution 1

Use ExecuteScalar instead of ExecuteNonQuery.

See DbCommand.ExecuteScalar Method

Posted 24-Jun-13 8:04am

Mike Meinz

Updated 24-Jun-13 8:09am

v4

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loai_maane 24-Jun-13 14:08pm

thnx:))

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Ron Beyer · Accepted Answer · 2013-06-24T08:05:00

Solution 2

ExecuteNonQuery returns the number of rows involved in the command. Its probably running your command, but returning 0 since no rows were affected. ExecuteNonQuery should be used for Updates, Inserts, and Deletes, not Selects.

Instead of using cmd5.ExecuteNonQuery(), do this:

C#

int maxID = (int)cmd5.ExecuteScalar();

Then maxID will hold the MaxID value from the query.

Posted 24-Jun-13 8:05am

Ron Beyer

Comments

loai_maane 24-Jun-13 14:08pm

thnx Ron :))

Ron Beyer 24-Jun-13 14:16pm

If one of these (or both really) was the answer, please mark them as answer so people can reference them in the future. Thanks!

loai_maane 24-Jun-13 14:29pm

Ron you know in access database, the id field i want to sort it again .
this the code .
OleDbConnection h5 = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\\IJC Database.accdb");
OleDbConnection h6 = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\\users\\IJC Database.accdb");
OleDbCommand cmd5;
OleDbCommand cmd6;
h5.Open();
cmd5 = new OleDbCommand("select count(ID) from ijc"+";",h5);
int countID = (int)cmd5.ExecuteScalar();
h5.Close();
h6.Open();
for (int i = 1; i <= countID; i++)
{
cmd6 = new OleDbCommand("update ijc set ID='"+i+"';",h6);
cmd6.ExecuteNonQuery();

}
h6.Close();

but how can i move to the next id... you understand me ??