Problem by doing a query on MySQL using dblink

Good Morning,well,the DBLink works perfectly,but if the field in the MySQL DB is type TEXT(CLOB) throw the next error:
ORA-28500: la conexión de ORACLE a un sistema no Oracle ha devuelto este mensaje:
[Generic Connectivity Using ODBC]DRV_BlobRead: DB_ODBC_ENGINE (1489): ; [MySQL][ODBC 5.1 Driver][mysqld-5.1.30]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '"CUSTOM_VALUES" WHERE "id"=16' at line 1 (SQL State: 37000; SQL Code: 1064)
ORA-02063: 2 lines precediendo a MYSQLDB
28500. 00000 - "connection from ORACLE to a non-Oracle system returned this message:"
*Cause: The cause is explained in the forwarded message.
*Action: See the non-Oracle system's documentation of the forwarded
message
Thank you
Edited by: 812419 on 18-ene-2011 0:41

Hi,
You are hitting a known problem with the MySQL ODBC driver and 10g HSODBC which is discussed in this note on My Oracle Support -
Problems Selecting Mysql Blob Data Using Hsodbc - Error In Your SQL Syntax (Doc ID 739274.1)
There are 3 workrounds -
a) convert the affected column to a char or varchar column in MySQL.
b) use the Openlink ODBC driver. This is available from -
http://download.openlinksw.com/
c) create a view in MySQL which uses the 'CAST' function to convert the affected column to char. As an
example for a BLOB -
create view test_blob_v as select col1, cast(col2 as char) as col2 from test_blob ;
Then select from the view in Oracle -
select * from test_blob_v@mysql ;
========
If you are using 10g HSODBC you should migrate to 11g Database Gateway for ODBC (DG4ODBC) as 10g HSODBC is now desupported and DG4ODBC is the replacement product.
Regards,
Mike

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