Question

SQL requests with double-quotes not working with managed database

Posted on January 25, 2020
MySQL
Asked by shonore

I have a php app that successfully makes SQL requests against MySQL servers. Nevertheless the same app breaks against DO managed database whenever the requests include double-quotes.

The following request returns an error 1054 with managed database while it works with classic MySQL servers.

select * from users where username="demo" 
=> error 1054

select * from users where username='demo'
=> ok

Is there a way to configure DO managed database to accept double-quotes?

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Andrew Moore

DigitalOcean Employee

• January 26, 2020

Accepted Answer

This is related to the sql_mode used. There’s a sql_mode setting, ‘ANSI_QUOTES’ that will make the " an identifier character.

e.g.

mysql> set session sql_mode = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION,ANSI_QUOTES';
Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1 where c3="foo";  <-- double quotes operating the same as `
ERROR 1054 (42S22): Unknown column 'foo' in 'where clause'

mysql> select * from t1 where c3='foo';  <-- single quotes works
+----+----+----+------+
| id | c1 | c2 | c3   |
+----+----+----+------+
|  3 |  5 |  6 | foo  |
+----+----+----+------+
1 row in set (0.00 sec)

mysql> set session sql_mode='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1 where c3="foo";
+----+----+----+------+
| id | c1 | c2 | c3   |
+----+----+----+------+
|  3 |  5 |  6 | foo  |
+----+----+----+------+
1 row in set (0.00 sec)

I’ve removed the ANSI_QUOTES sql-mode setting at a session level.

You can change the global value under the settings tab of your instance(s).

Hope this solves your issue!

Andrew