[erlang-questions] Erlang and MySQL: ODBC, Column type not supported

Parnell Springmeyer <>
Sun May 1 19:58:25 CEST 2011


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I would recommend using dizzyd's MySQL module:

https://github.com/dizzyd/erlang-mysql-driver

It works very well for me!

Hanfei Shen <> writes:

> Dear all,
>
> I'm a newbie programming in erlang. When I used ODBC to connect to a
> MySQL database through Connector/ODBC (MyODBC), I got some error when
> calling odbc:sql_query(Conn, "SELECT * FROM action"):
>
> {error,"Column type not supported"}
>
> Then I call odbc:describe_table(Conn, "action"), it returned:
>
> {ok,[{"id",sql_integer},
>      {"code",'ODBC_UNSUPPORTED_TYPE'},
>      {"compliment_desc",'ODBC_UNSUPPORTED_TYPE'},
>      {"status_desc",'ODBC_UNSUPPORTED_TYPE'},
>      {"parameter",'ODBC_UNSUPPORTED_TYPE'},
>      {"cause",'ODBC_UNSUPPORTED_TYPE'},
>      {"disabled",sql_tinyint}]}
>
> And desc the table in mysql client:
> mysql> desc action;
> +-----------------+--------------+------+-----+---------+----------------+
> | Field           | Type         | Null | Key | Default | Extra          |
> +-----------------+--------------+------+-----+---------+----------------+
> | id              | int(11)      | NO   | PRI | NULL    | auto_increment |
> | code            | varchar(255) | NO   |     | NULL    |                |
> | compliment_desc | varchar(255) | NO   |     |         |                |
> | status_desc     | varchar(255) | NO   |     |         |                |
> | parameter       | varchar(255) | NO   |     |         |                |
> | cause           | varchar(255) | NO   | UNI |         |                |
> | disabled        | tinyint(1)   | NO   |     | 0       |                |
> +-----------------+--------------+------+-----+---------+----------------+
>
> It seems that Erlang ODBC driver does not support the mysql type
> varchar? How can I use the database without touching the db schema?
>
>
> Some details about the system env:
>
> $ uname -a
> Linux 2.6.36-gentoo-r8 #4 SMP Thu Apr 7 20:13:18 CST 2011 x86_64
> Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz GenuineIntel GNU/Linux
>
> $ erl
> Erlang R13B04 (erts-5.7.5) [source] [64-bit] [smp:2:2] [rq:2]
> [async-threads:0] [kernel-poll:false]
>
> $ emerge -vp erlang
> dev-lang/erlang-13.2.4  USE="doc kpoll odbc smp ssl -emacs -hipe -java
> -sctp -tk -wxwidgets"
>
> eshell> code:which(odbc).
> "/usr/lib64/erlang/lib/odbc-2.10.7/ebin/odbc.beam"
>
> $ mysql -V
> mysql  Ver 14.14 Distrib 5.1.51, for pc-linux-gnu (x86_64) using readline 5.1
>
> Server version: 5.1.51-log Gentoo Linux mysql-5.1.51
>
> $ emerge -vp myodbc
> dev-db/myodbc-5.1.6  USE="-debug -doc -qt4 -static"
>
>
> Any help will be greatly appreciated.  Thanks in advance.
> Sorry for my poor English, I'm not a native...
>
> Best,
>
> --
> Hanfei
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>

- -- 
Parnell "ixmatus" Springmeyer (http://ixmat.us)
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