Logging to a mySQL database
Links
The MIDAS logger (mlogger) is able to store information in a mySQL database. This option is an alternative to the runlog.txt file handled by the MIDAS Analyzer . The two main advantages using the SQL are:
- The recording is done by the logger and therefore is independent of the user analyzer.
- The definition of the parameters to be recorded in the database is entirely setup in the ODB under the /Logger/SQL subtree.
The SQL option is enabled by the preprocessor flag NEED_MYSQL at build time. This option, when enabled, will cause the MIDAS logger (mlogger) to create a subtree SQL under the /Logger ODB tree . This tree contains information for mySQL access with the predefined mySQL database name Midas and table Runlog.
Under two dedicated subdirectories Links BOR and Links EOR , predefined links exists which will be used at begin-of-run (BOR) and end-of-run (EOR) respectively for storing parameter values into the database. These elements are ODB links allowing the user to extend the list with any parameter in the ODB database. This logger mySQL option may replace or complement the runlog.txt functionality of the ana_end_of_run() function from the analyzer.c.
The following example shows a /Logger/SQL tree as created by mlogger. See ODB /Logger/SQL subtree for an explanation of the meaning of each key.
Example /Logger/SQL subtree
[local:midas:S]/Logger>ls -lr SQL
Key name Type #Val Size Last Opn Mode Value
---------------------------------------------------------------------------
SQL DIR
Create database BOOL 1 4 27s 0 RWD n
Write data BOOL 1 4 27s 0 RWD n
Hostname STRING 1 80 27s 0 RWD localhost
Username STRING 1 80 27s 0 RWD root
Password STRING 1 80 27s 0 RWD
Database STRING 1 32 27s 0 RWD midas
Table STRING 1 80 27s 0 RWD Runlog
Logfile STRING 1 80 27s 0 RWD sql.log
Links BOR DIR
Run number LINK 1 20 58s 0 RWD /Runinfo/Run number
Start time LINK 1 20 58s 0 RWD /Runinfo/Start time
Links EOR DIR
Stop time LINK 1 19 4m 0 RWD /Runinfo/Stop time