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How to update a MySQL table using C#?

Posted on 2009-07-15
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Last Modified: 2013-12-17

Hello group,

How can I update a record in MySQL table?
I can select and get the resuls but I cannot update any record.

Thanks.

strSQLStmt1 = "";
 strSQLStmt1 = "UPDATE table set  fld= '" + t.score.Trim().ToString() + "' WHERE Id = '" + t.applicant_id.Trim() + "' ";
                        Reader1 = command.ExecuteReader();
                        Reader1.Close();

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Question by:akohan
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käµfm³d   👽 earned 500 total points
ID: 24865730
Use

   int rowsUpdated;
   rowsUpdated = command.ExecuteNonQuery();

instead of ExecuteReader(). rowsUpdated is just to show what is returned.
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Author Comment

by:akohan
ID: 24865866


Thanks I'm sure that is the answer but I'm getting

Cannot implicitly convert type 'int' to 'MySql.Data.MySqlClient.MySqlDataReader'
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Author Comment

by:akohan
ID: 24865879

OK I fixed that but my return value is -1 !

What could cause that? in msdn page says a rollback might cause it. Is this something I should take care of in db?
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Expert Comment

by:käµfm³d 👽
ID: 24868884
I don't see where in code you assigned the sql query to the command object. See notation below. Also, you can set a breakpoint at line 6 below, mouse over the strSQLStmtml variable and see the actual SQL statement that will be executed against the DB. You can try manually running that query against the DB to see if it generates any errors.
strSQLStmt1 = "";
strSQLStmt1 = "UPDATE table set  fld= '" + t.score.Trim().ToString() + "' WHERE Id = '" + t.applicant_id.Trim() + "' ";
 
command.CommandText = strSQLStmtl;
 
Reader1 = command.ExecuteReader();
Reader1.Close();

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