Hello. We have a database driven system that serves multiple clients. We have a single database for this purpose. The data(rows) in some of the tables are specific to individual clients. In all such tables, we have a field FLD_CLIENT_ID whose value depicts the client to whom that row of information corresponds to. All other tables in the system, are agnostic to client information; but are required for the system to function as a whole.
I would want to take seperate backups for individual clients. I try to use mysqldump to generate a dump file by filtering on the FLD_CLIENT_ID column. However, since not all tables contain the FLD_CLIENT_ID column, mysqldump fails. I use mysqldump from the commandline as ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- --- ?>mysqldump --single-transaction -u root clientdb --where="FLD_CLIENT_ID=1" > client1_dbbackup.sql ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- --- The error that is thrown is ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- --- mysqldump: Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE */ * FROM `ACCOUNT` WHERE FLD_CLIENT_ID=1': Unknown column FLD_CLIENT_ID' in 'where clause' (1054) ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- --- which means thats the dump can't be created as the table ACCOUNT does not contain the column FLD_CLIENT_ID. Is it possible to write the where clause such that it should apply the FLD_CLIENT_ID filter only if the column exists in the table; and if not, dump the data anyways. I am on RHEL - MySQL 4.1.11 - Storage engine INNoDB Regards, Rithish.
