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Kamailio's database schema is specified in an XML format, which allows generation of creation scripts for many database types at once.
The XML files with the database table definitions are located in the source tree, inside subdirectory:
Each table is defined in the file tablename.xml. For example, the definition of table domain is in file:
Changing the database schema (adding new tables, adding/removing/updating columns) must be done creating or updating the XML files.
Regeneration of the database creation scripts is done running the next command inside the root folder of the source tree:
This command generates the SQL or control files to be used by kamdbctl tool when creating the database structure. It requires the tool xsltproc to process the XML files, tool which is also needed for generation of the readme files.
Changing the structure of an existing database table requires only the above steps. Adding a new table requires as well:
For example, the group of the tables used by module domain is specified in file:
It includes references to two tables: domain and domain_attrs.
If you add a new table, you must add the new files related to it to GIT repository, before committing the changes.
It is recommended to split the commit in two parts, because they affect different components:
This brings the benefit of easy backporting, because the commit to xml file is unlikely to create conflicts, changing one file in a group of lines related to same column, so it can be cherry-picked alone. Commits to database creation scripts affects many files and can result in conflicts if new columns were added meanwhile to the development version to that table.
If there is a fix that has to be backported, always do it to master branch and then cherry-pick it in the stable branches. With split commits, the typical backport procedure is: