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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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bool check_and_repair(THD *thd) { return HA_ERR_WRONG_COMMAND; } int dump(THD* thd, int fd = -1) { return HA_ERR_WRONG_COMMAND; } int disable_indexes(uint mode) { return HA_ERR_WRONG_COMMAND; } int enable_indexes(uint mode) { return HA_ERR_WRONG_COMMAND; } int indexes_are_disabled(void) {return 0;} void start_bulk_insert(ha_rows rows) {} int end_bulk_insert() {return 0; } int discard_or_import_tablespace(my_bool discard) uint referenced_by_foreign_key() { return 0;} void init_table_handle_for_HANDLER() void free_foreign_key_create_info(char* str) {} const char *table_type() const =0; const char **bas_ext() const =0; ulong table_flags(void) const =0; uint uint uint uint uint uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; } max_supported_keys() const { return 0; } max_supported_key_parts() const { return MAX_REF_PARTS; } max_supported_key_length() const { return MAX_KEY_LENGTH; } max_supported_key_part_length() const { return 255; } min_record_length(uint options) const { return 1; }
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bool is_crashed() const { return 0; } int rename_table(const char *from, const char *to); int delete_table(const char *name); void drop_table(const char *name);
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virtual int create(const char *name, TABLE *form, HA_CREATE_INFO *info)=0; ... virtual int external_lock(THD *thd __attribute__((unused)), int lock_type __attribute__((unused))) ... virtual int write_row(byte *buf __attribute__((unused))) ... virtual int update_row(const byte *old_data __attribute__((unused)), byte *new_data __attribute__((unused))) ... virtual int delete_row(const byte *buf __attribute__((unused))) ... };
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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A Brief Tour of a MySQL Storage Engine
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The best way to see the handler work is to watch it in action. Therefore, let s examine a real storage engine in use before we start building one. You can follow along by compiling your server with debug if you haven t already. Go ahead and start your server and debugger, and then attach your debugging tool to the running server as described in 5. I want to show you a simple storage engine in action. In this case, I ll use the archive storage engine. With the debugger open and the server running, open the ha_archive.cc file and place a breakpoint on the first executable line for the following methods: int ha_archive::create(...) static ARCHIVE_SHARE *ha_archive::get_share(...) int ha_archive::write_row(...)int ha_tina::rnd_next(...) int ha_archive::rnd_next(...) Once the breakpoints are set, launch the command-line MySQL client, change to the test database, and issue this command: CREATE TABLE testarc (a int, b varchar(20), c int) ENGINE=ARCHIVE; You should immediately see the debugger halt in the create() method. This method is where the base data table is created. Indeed, it is one of the first things to execute. The my_create() method is called to create the file. Notice in this method that the field iterator loops through all of the fields in the table. This is important because it shows that the fields are already created. They are stored in the testarc.frm file in the data folder. Notice that the code is looking for a field with the AUTO_INCREMENT_FLAG set (at the top of the method); if the field is found, the code sets an error and exits. This is because the archive storage engine doesn t support auto-increment fields. You can also see that the method is creating a meta file and checking to see that the compression routines are working properly. Take a moment and step through the code and watch the iterator. You can continue the execution at any time or, if you re really curious, continue to step through the return to the calling function. Now, let s see what happens when we insert data. Go back to your MySQL client and enter this command: INSERT INTO testarc VALUES (10, "test", -1); This time, the code halts in the get_share() method. This method is responsible for creating the shared structure for all instances of the archive handler. As you step through this method, you can see where the code is setting the global variables and other initialization type tasks. Go ahead and let the debugger continue execution. The next place the code halts is in the write_row() method. This method is where the data that is passed through the buf parameter is written to disk. The record buffer (byte *buf) is the mechanism that MySQL uses to pass rows through the system. It is a binary buffer containing the data for the row and other metadata. It is what the MySQL documentation refers to as the internal format. As you step through this code, you will see the engine set some statistics, do some more error checking, and eventually write the data using the method real_write_row() at the end of the method. Go ahead and step through that method as well.
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