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Since Plesk 8.1, Plesk is shipped with utility which can be used for executing simple queries in Plesk database, independent on Plesk database engine.
Utility is called 'dbclient.exe'. It is located at the directory %plesk_bin%.
Here are examples of usage:
SELECT
"%plesk_bin%\dbclient.exe" --direct-sql --sql="select * from misc where val='test'" INSERT
"%plesk_bin%\dbclient.exe" --direct-sql --sql="insert into misc values ('test','test')" UPDATE
"%plesk_bin%\dbclient.exe" --direct-sql --sql="update misc set param='test1' where val='test' " DELETE
"%plesk_bin%\dbclient.exe" --direct-sql --sql="delete from misc where val='test'"