Database Migration Tool
Database Migration Tool
dbupgrade [OPTIONS] [-l API_LEVEL|-L] DBNAME SCHEMA DIRECTORY
Upgrade the given
SCHEMA in the database specified as
DBNAME with SQL
DIRECTORY is searched for all files with the
.sql suffix. These files are SQL scripts with a special header sections:
-- Schema: my-db-schema -- Version: 25 -- API-Level: 3 -- Dialect: postgres CREATE TABLE ...
The following headers are required:
Name of the schema to update.
Database dialect of this script. Use SQLalchemy's database URL scheme identifier, e.g.
The new version of the schema after this script was applied. It is an error if two scripts have the same schema, dialect, and version.
The new API level of the schema after this script was applied. For a given schema, the API level of a subsequent version must either be equal or higher by one than the API level of the preceding version. For example, if script version 44 has API level 3, script version 45 must have API level 3 or 4.
- Transaction (optional)
Possible values are
no. When this header is yes, all statements of a single upgrade file and the corresponding version upgrade statements are executed within a single transaction. Otherwise each statement is executed separately. The former is usually preferable so that all changes will be rolled back if a script fails to apply, but the latter is required in some cases.
The database must contain a table
db_config with three columns:
api_level. If this table does not exist, it is created.
This table must contain exactly one row for the given schema. If this row
does not exist, it is created with version and api_level initially set to 0.
The current version and API level of the schema are requested from the database and all scripts with a higher version number are applied, in order. If there are any version numbers missing, the script will stop after the last version before the missing version.
-L option is supplied, only scripts that do not
increase the API level will be applied. If the
-l option is given, all
scripts up to the given API level will be applied.
-L will apply all
scripts without regard to the API level.
Each script is executed in a seperate transaction. If a script fails, all changes in that script will be rolled back and the script will stop with an error message and a non-zero return status.
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