Error: select command denied to user '

Question

In my website, I am using MySQL database. I am using a webservice where in I do all my database related manipulations.

Now In one of the methods of that webservice, I get the following Error.

select command denied to user ''@'' for table ''

What could be wrong?

Below is the code where I get that error. I tried debugging and found that it fails at the line

MySqlDataReader result1 = command1.ExecuteReader();

Here is my code:

        String addSQL = "Select Max(`TradeID`) from `jsontest`.`tbl_Positions";
        MySqlConnection objMyCon = new MySqlConnection(strProvider);
        objMyCon.Open();
        MySqlCommand command = objMyCon.CreateCommand();

        command.CommandText = addSQL;
         MySqlDataReader result = command.ExecuteReader();
        //int j = command.ExecuteNonQuery();
         while (result.Read())
         {
             MaxTradeID = Convert.ToInt32(result[0]);
         }
        objMyCon.Close();
        for (i = 1; i <= MaxTradeID; i++)
        {
            String newSQL = "Select `Strike`,`LongShort`,`Current`,`TPLevel`,`SLLevel` from `json`.`tbl_Position` where `TradeID` = '" + i + "'";
            MySqlConnection objMyCon1 = new MySqlConnection(strProvider);
            objMyCon1.Open();
            MySqlCommand command1 = objMyCon1.CreateCommand();

            command1.CommandText = newSQL;
            MySqlDataReader result1 = command1.ExecuteReader();
           objMyCon2.Close();

Answer 1

The problem is most probably between a . and a _. Say in my query I put

SELECT ..... FROM LOCATION.PT

instead of

SELECT ..... FROM LOCATION_PT

So I think MySQL would think LOCATION as a database name and was giving access privilege error.

Answer 2

This problem happened to me because I had the hibernate.default_schema set to a different database than the one in the DataSource.

Being strict on my mysql user permissions, when hibernate tried to query a table it queried the one in the hibernate.default_schema database for which the user had no permissions.

Its unfortunate that mysql does not correctly specify the database in this error message, as that would've cleared things up straight away.

Answer 3

database user does not have the permission to do select query.

you can grant the permission to the user if you have root access to mysql

http://dev.mysql.com/doc/refman/5.1/en/grant.html

Your second query is on different database on different table.

 String newSQL = "Select `Strike`,`LongShort`,`Current`,`TPLevel`,`SLLevel` from `json`.`tbl_Position` where `TradeID` = '" + i + "'";

And the user you are connecting with does not have permission to access data from this database or this particular table.

Have you consider this thing?

Answer 4

select command denied to user ''@'' for table ''

This problem is a basically generated after join condition are wrong database name in your join query. So please check the your select query in join table name after database.

Then solve it for example its correct ans ware

string g = " SELECT `emptable`.`image` , `applyleave`.`id` , `applyleave`.`empid` , `applyleave`.`empname` , `applyleave`.`dateapply` , `applyleave`.`leavename` , `applyleave`.`fromdate` , `applyleave`.`todate` , `applyleave`.`resion` , `applyleave`.`contact` , `applyleave`.`leavestatus` , `applyleave`.`username` , `applyleave`.`noday` FROM `DataEMP_ems`.`applyleave` INNER JOIN `DataEMP_ems`.`emptable` ON ( `applyleave`.`empid` = `emptable`.`empid` ) WHERE ( `applyleave`.`leavestatus` = 'panding' ) ";

The join table is imputable and applyleave on the same database but online database name is diffrent then given error on this problem.

Answer 5

I had the same problem. This is related to hibernate. I changed the database from dev to production in hibernate.cfg.xml but there were catalog attribute in other hbm.xml files with the old database name and it was causing the issue.

Instead of telling incorrect database name, it showed Permission denied error.

So make sure to change the database name everywhere or just remove the catalog attribute

Answer 6

I had the same problem. I was very frustrating with it. Maybe this is not answering the question, but I just want to share my error experience, and there may be others who suffered like me. Evidently it was just my low accuracy.

I had this:

SELECT t_comment.username,a.email FROM t_comment
LEFT JOIN (
    SELECT username,email FROM t_un
) a
ON t_comment.username,a.email

which is supposed to be like this:

SELECT t_comment.username,a.email FROM t_comment
LEFT JOIN (
    SELECT username,email FROM t_un
) a
ON t_comment.username=a.username

Then my problem was resolved on that day, I'd been struggled in two hours, just for this issue.