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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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mysql> DELETE FROM t1 WHERE col_a = 5; Query OK, 0 rows affected (0.00 sec) mysql> SELECT * FROM t1; +-------+--------------+-------+ | col_a | col_b | col_c | +-------+--------------+-------+ | 2 | second test | 43 | | 9 | fourth test | -2 | | 4 | tenth test | 11 | | 8 | seventh test | 20 | +-------+--------------+-------+ 4 rows in set (0.00 sec) mysql> SELECT * FROM t1 WHERE col_a = 4; +-------+------------+-------+ | col_a | col_b | col_c | +-------+------------+-------+ | 4 | tenth test | 11 | +-------+------------+-------+ 1 row in set (0.00 sec) mysql> SELECT * FROM t1 WHERE col_a >= 2 AND col_a <= 5; +-------+-------------+-------+ | col_a | col_b | col_c | +-------+-------------+-------+ | 2 | second test | 43 | | 4 | tenth test | 11 | +-------+-------------+-------+ 2 rows in set (0.02 sec) mysql> SELECT * FROM t1 WHERE col_a = 22; Empty set (0.00 sec) mysql> DELETE FROM t1 WHERE col_a = 5; Query OK, 0 rows affected (0.00 sec) mysql> SELECT * FROM t1; +-------+--------------+-------+ | col_a | col_b | col_c | +-------+--------------+-------+ | 2 | second test | 43 | | 9 | fourth test | -2 | | 4 | tenth test | 11 | | 8 | seventh test | 20 | +-------+--------------+-------+ 4 rows in set (0.00 sec)
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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mysql> SELECT * FROM t1 WHERE col_a = 5; Empty set (0.00 sec) mysql> UPDATE t1 SET col_a = 99 WHERE col_a = 8; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> SELECT * FROM t1 WHERE col_a = 8; Empty set (0.00 sec) mysql> SELECT * FROM t1 WHERE col_a = 99; +-------+--------------+-------+ | col_a | col_b | col_c | +-------+--------------+-------+ | 99 | seventh test | 20 | +-------+--------------+-------+ 1 row in set (0.00 sec) mysql> RENAME TABLE t1 TO t2; Query OK, 0 rows affected (0.02 sec) mysql> SELECT * FROM t2; +-------+--------------+-------+ | col_a | col_b | col_c | +-------+--------------+-------+ | 2 | second test | 43 | | 9 | fourth test | -2 | | 4 | tenth test | 11 | | 99 | seventh test | 20 | +-------+--------------+-------+ 4 rows in set (0.00 sec) mysql> DROP TABLE t2; Query OK, 0 rows affected (0.02 sec) Well, that s it for a stage 5 engine. It is now a basic read/write/update/delete storage engine with indexing, which is the stage where most of the storage engines in MySQL are implemented. Indeed, for all but transactional environments this should be sufficient for your storage needs. In the next stage, I ll discuss the much more complex topic of adding transaction support.
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Stage 6: Adding Transaction Support
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Currently, only two of the traditional storage engines in MySQL support transactions: BDB and InnoDB.7 Transactions provide a mechanism that permits a set of operations to execute as a single atomic operation. For example, if a database was built for a banking institution, the
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7. The cluster storage engine (NDB) also supports transactions.
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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macro operations of transferring money from one account to another (money removed from one account and placed in another) would preferably be executed completely without interruption. Transactions permit these operations to be encased in an atomic operation that will back out any changes should an error occur before all operations are complete, thus avoiding data being removed from one table and never making it to the next table. A sample set of operations in the form of SQL statements encased in transactional commands is shown in Listing 7-57. Listing 7-57. Sample Transaction SQL Commands START TRANSACTION; UPDATE SavingsAccount SET Balance = Balance 100 WHERE AccountNum = 123; UPDATE CheckingAccount SET Balance = Balance + 100 WHERE AccountNum = 345; COMMIT; In practice, most database professionals specify the MyISAM table type if they require faster access and InnoDB if they need transaction support. Fortunately, MySQL AB has provided the pluggable storage engine with the capability to support transactions. The facilities for performing transactions in storage engines is supported by the start_stmt() and external_lock() methods. The start_stmt() method is called when a transaction is started. The external_lock() method is used to signal a specific lock for a table and is called when an explicit lock is issued. Your storage engine must implement the new transaction in the start_stmt() method by creating a savepoint and registering the transaction with the server using the trans_register_ha() method. This method takes as parameters the current thread, whether you want to set the transaction across all threads, and the address of your handlerton. Calling this causes the transaction to start. An example implementation of the start_stmt() method is shown in Listing 7-58. Listing 7-58. Example start_stmt() Method Implementation int my_handler::start_stmt(THD *thd, thr_lock_type lock_type) { DBUG_ENTER("my_handler::index_last"); int error= 0; /* Save the transaction data */ my_txn *txn= (my_txn *) thd->ha_data[my_handler_hton.slot]; /* If this is a new transaction, create it and save it to the handler's slot in the ha_data array. */ if (txn == NULL) thd->ha_data[my_handler_hton.slot]= txn= new my_txn;
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