diff options
Diffstat (limited to 'migrate/migrate.cxx')
| -rw-r--r-- | migrate/migrate.cxx | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/migrate/migrate.cxx b/migrate/migrate.cxx index 81c4543..1577f1b 100644 --- a/migrate/migrate.cxx +++ b/migrate/migrate.cxx @@ -206,7 +206,6 @@ create (database& db, bool extra_only) const // Register the data migration functions for the package database schema. // -#if 0 template <schema_version v> using package_migration_entry_base = data_migration_entry<v, LIBBREP_PACKAGE_SCHEMA_VERSION_BASE>; @@ -218,11 +217,31 @@ struct package_migration_entry: package_migration_entry_base<v> : package_migration_entry_base<v> (f, "package") {} }; +// Migrate the package buildable member data while changing its type from +// boolean to enumeration. + +// Note that changing the data member type is not automatically handled by the +// migration machinery. Thus, we split the schema change into two steps, +// delaying the second step until the next commit: +// +// - Rename the buildable data member column preserving its boolean type and +// migrate the data copying it from the original column into the new +// temporary column (package schema version 18). Note that the original +// column is deleted at the end of the migration. +// +// - Change the buildable data member type to the buildable_status +// enumeration, revert the column name and migrate the data by filling the +// originally-named column based on the temporary column (package schema +// version 19). Note that the temporary column is deleted at the end of the +// migration. +// static const package_migration_entry<18> package_migrate_v18 ([] (database& db) { + // Copy the buildable flag values into the new temporary column. + // + db.execute ("UPDATE package SET buildable_ = buildable"); }); -#endif // main() function // |