Error: select command denied to user '<userid>'@'<ip-address>' for table '<table-name>'

问题:

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 

回答1:

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?

回答2:

I'm sure the original poster's issue has long since been resolved. However, I had this same issue, so I thought I'd explain what was causing this problem for me.

I was doing a union query with two tables -- 'foo' and 'foo_bar'. However, in my SQL statement, I had a typo: 'foo.bar'

So, instead of telling me that the 'foo.bar' table doesn't exist, the error message indicates that the command was denied -- as though I don't have permissions.

Hope this helps someone.

回答3:

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.

回答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.

回答5:

You need to grant SELECT permissions to the MySQL user who is connecting to MySQL. See:

http://dev.mysql.com/doc/refman/5.0/en/privilege-system.html

http://dev.mysql.com/doc/refman/5.0/en/user-account-management.html

回答6:

if you are working from a windows forms application this worked for me "server=localhost; user id=dbuser; password=password; database=dbname; Use Procedure Bodies=false;"

just add the "Use Procedure Bodies=false" at the end of your conection string.

回答7:

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.

回答8:

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

回答9:

I had the exact same error message doing a database export via Sequel Pro on a mac. I was the root user so i knew it wasn't permissions. Then i tried it with mysqldump and got a different error message: Got error: 1449: The user specified as a definer ('joey'@'127.0.0.1') does not exist when using LOCK TABLES

Ahh, I had restored this database from a backup on the dev site and I hadn't created that user on this machine. "grant all on . to 'joey'@'127.0.0.1' identified by 'joeypass'; " did the trick.

hth

回答10:

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.

回答11:

A bit late to the party but, should you have root access, you can do the following directly:

Log into your mysql as root,

$ mysql -u root -p 

Show databases;

mysql>SHOW DATABASES; 

Select mysql database, which is where all privileges info is located

mysql>USE mysql; 

Show tables.

mysql>SHOW TABLES; 

The table concerning privileges for your case is 'db', so let's see what columns it has:

mysql>DESC db; 

In order to list the users privileges, type the following command, for example:

mysql>SELECT user, host, db, Select_priv, Insert_priv, Update_priv, Delete_priv FROM db ORDER BY user, db; 

If you can't find that user or if you see that that user has a 'N' in the Select_priv column, then you have to either INSERT or UPDATE accordingly:

INSERT:

INSERT INTO db (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv) VALUES ('localhost','DBname','UserName','Y' ,'N','N','N'); 

UPDATE:

UPDATE db SET Select_priv = 'Y' WHERE User = 'UserName' AND Db = 'DBname' AND Host='localhost'; 

Finally, type the following command:

mysql>FLUSH PRIVILEGES; 

Ciao.

回答12:

Similar to other answers I had miss typed the query.

I had -

SELECT t.id FROM t.table LEFT JOIN table2 AS t2 ON t.id = t2.table_id 

Should have been

SELECT t.id FROM table AS t LEFT JOIN table2 AS t2 ON t.id = t2.table_id 

Mysql was trying to find a database called t which the user didn't have permission for.

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