15.9 The EXAMPLE Storage Engine
EXAMPLE storage engine is a stub engine that does nothing. Its purpose is to serve as an example in the MySQL source code that illustrates how to begin writing new storage engines. As such, it is primarily of interest to developers.
To enable the
EXAMPLE storage engine if you build MySQL from source, invoke CMake with the
To examine the source for the
EXAMPLE engine, look in the
storage/example directory of a MySQL source distribution.
When you create an
EXAMPLE table, the server creates a table format file in the database directory. The file begins with the table name and has an
.frm extension. No other files are created. No data can be stored into the table. Retrievals return an empty result.
mysql> CREATE TABLE test (i INT) ENGINE = EXAMPLE; Query OK, 0 rows affected (0.78 sec) mysql> INSERT INTO test VALUES(1),(2),(3); ERROR 1031 (HY000): Table storage engine for 'test' doesn't » have this option mysql> SELECT * FROM test; Empty set (0.31 sec)
EXAMPLE storage engine does not support indexing.