how to print barcode in c# net BUILDING YOUR OWN STORAGE ENGINE in Font

Encoding QR-Code in Font BUILDING YOUR OWN STORAGE ENGINE

CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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OK, you now have a completed stage 2 engine. All that is left to do is compile the server and run the tests.
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Testing Stage 2 of the Spartan Engine
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When you run the spartandb test again, you should see all of the statements complete successfully. However, there are two things the test doesn t verify for you. First, you need to make sure the .sde file was created and deleted. Second, you need to make sure the rename command works. Testing the commands for creating and dropping the table is easy. Launch your server and then a MySQL client. Issue the CREATE statement from the test and then use your file browser to navigate to the /data/test folder. There you should see two files: t1.frm and t1.sde. Return to your MySQL client and issue the DROP statement. Then return to the /data/test folder and verify that the files are indeed deleted. Testing the command that renames the table is also easy. Repeat the CREATE statement test and then issue the command RENAME TABLE t1 TO t2; Use your file browser to navigate to the /data/test folder. There you should see two files: t2.frm and t2.sde. Return to your MySQL client and issue the DROP statement. Then return to the /data/test folder and verify that the files are indeed deleted. Now that you have verified the RENAME statement works, add that to the spartandb test file and rerun the test. The test should complete without errors. Listing 7-19 shows the updated spartandb.test file. Listing 7-19. Updated Spartan Storage Engine Test File (spartandb.test) # # Simple test for the Spartan storage engine # --disable_warnings drop table if exists t1; --enable_warnings CREATE TABLE t1 ( col_a int, col_b varchar(20), col_c int ) ENGINE=SPARTAN; SELECT * FROM t1; RENAME TABLE t1 TO t2; DROP TABLE t2; Well, that s it for a stage 2 engine. It is plugged in and creates, deletes, and renames files. In the next stage, we ll add the ability to read and write data.
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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Stage 3: Reading and Writing Data
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The goal of this stage is to produce a working storage engine that can read and write data. In this stage, I ll show you how to incorporate the Spartan_data class for reading and writing data. I ll walk you through each change and include the completed method source code for each change.
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Updating the Spartan Source Files
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Making a stage 3 engine requires updates to the basic reading process (described earlier). To implement the read operation, you ll be making changes to the rnd_init(), rnd_next(), position(), and rnd_pos() methods in the ha_spartan.cc file. The position() and rnd_pos() methods are used during large sorting operations and use an internal buffer to store the rows. The write operation requires changes to only the write_row() method. Updating the Header File The position methods require that you store a pointer either a record offset position or a key value to be used in the sorting operations. MySQL AB provides a nifty way of doing this, as you ll see in the position methods in a moment. Open the ha_spartan.h file and add the current_position variable to the ha_spartan class. Listing 7-20 shows an excerpt with the changes. Listing 7-20. Changes to the ha_spartan Class in ha_spartan.h class ha_spartan: public handler { THR_LOCK_DATA lock; /* MySQL lock */ SPARTAN_SHARE *share; /* Shared lock info */ off_t current_position; /* Current position in the file during a file scan */ ... Updating the Source File Return to the ha_spartan.cc file as that is where the rest of the changes need to be made. The first method you need to change is rnd_init(). Here is where you need to set the initial conditions for a table scan. In this case, you can set the current position to 0 (start of file) and the number of records to 0, and specify the length of the item you want to use for the sorting methods. In this case, use a long long since that is the data type for the current position in the file. Listing 7-21 shows the updated method with the changes. Listing 7-21. Changes to the rnd_init() Method in ha_spartan.cc int ha_spartan::rnd_init(bool scan) { DBUG_ENTER("ha_spartan::rnd_init"); current_position = 0; records = 0; ref_length = sizeof(long long); DBUG_RETURN(0); }
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