Enum values are themselves enumerated in sqlite as they are not supported
as a type. This leads to values being stored in their own table, and a
regular TEXT field being used in a MySQL ENUM's stead. The default value
for this field was being escaped with custom string replacement, and
erroneously relacing the backslash (a redundant operation). This lead
to invalid Fully Qualified Class Names in SilverStripe 4, which is a
required trait for polymorphic relationships. As a result any polymorphic
relationship not set on first write would then proceed to cause an execution
error the next time the dataobject with the relationship was fetched from
the database. By using the PHP supplied escape function for SQLite3 we can
avoid this, and restore functionality.
Relevant section of SQLite documentation to justify the removal of escaping
various characters, such as the backslash:
A string constant is formed by enclosing the string in single quotes (').
A single quote within the string can be encoded by putting two single quotes
in a row - as in Pascal. C-style escapes using the backslash character are
not supported because they are not standard SQL.
https://www.sqlite.org/lang_expr.html
Instead of using a custom "memory" key in the $databaseConfig
which never really got used this now allows someone to simply enable
in-memory databases by setting the path to ":memory:" or to use the
following environment variable:
define('SS_SQLITE_DATABASE_PATH', ':memory:');
In preparation for https://github.com/silverstripe/sapphire/pull/1319
Probably should accept this at the same time.
If someone knows of the relevant ALTER permissions in SQLite, feel free to implement.
As opposed to LIKE, the GLOB operator is case sensitive by default
in SQlite3. It uses "*" instead of "%" for wildcards,
which necessitated a new SearchFilter->getWildcard() method.
SQlite3 doesn't support per-term modifiers,
COLLATE BINARY LIKE is case insensitive by default
unless the field collation is set up accordingly.
There's connection-level modifiers (PRAGMA case_sensitive_like = true),
but that would affect all comparisators in the executed query.
While the SQLite3 module is predominantly used for testing,
its best to leave this decision to the code using it.
We should default to a conservative setting (slower, but persistent).
Also remove coupling to SapphireTest when setting this value.
Don't bother creating the directory if running in-memory.
