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

Painting Quick Response Code in Font BUILDING YOUR OWN STORAGE ENGINE

CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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Figure 7-4. Adding HAVE_SPARTAN_DB in the Preprocessor Definitions dialog box
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Figure 7-5. Adding WITH_SPARTAN_STORAGE_ENGINE in the Preprocessor Definitions dialog box
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Adding the Spartan Storage Engine to the Server
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Several files that must be modified in order to add the storage engine to the server. Table 7-2 lists the files that need to be changed and a summary of the changes necessary. Specific instructions for making these modifications follow, with excerpts of the source code for emphasis and clarification.
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Table 7-2. Summary of Changes to the MySQL Source Files
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Source File
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/include/my_config.h /sql/handler.h
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Description of Changes
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Add #define statements for the Spartan storage engine. Add another entry to the legacy_db_type enumeration. This allows the handler to identify the spartan table type.
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
Table 7-2. Summary of Changes to the MySQL Source Files
Source File
/sql/handler.cc
Description of Changes
Add another entry to the show_table_alias_st structure. This allows MySQL to alias the spartan string with the table type identifier in the handler.h file. Add the #ifdef conditional compilation statements to work with the preprocessor directives. Add the #ifdef conditional statements to work with the preprocessor directives. Add the sys_var_have_variable settings for the Spartan engine strings. Add the #undef statement and the SHOW_COMP_OPTION for the HAVE_SPARTAN_DB definition.
/sql/handlerton-win.cpp (Windows only) /sql/mysql_priv.h /sql/set_var.cc /sql/mysqld.cc
Open the my_config.h file and search for example. You should find the #define statement for the example storage engine near the bottom of the file. Copy and paste the two statements, then make the replacement for the Spartan storage engine. The following shows the correct code statements: /* Build Spartan storage engine */ #define WITH_SPARTAN_STORAGE_ENGINE 1 Open the handler.h file and modify the legacy_db_type enumeration. Add the DB_TYPE_ SPARTAN_DB element to the bottom of the list, above the DEFAULT database type element. This ensures that the value assigned to the DB_TYPE_SPARTAN_DB element does not conflict with the default storage engine element (notice the assignment DB_TYPE_DEFAULT=127). The following shows the completed code statements: enum legacy_db_type { DB_TYPE_UNKNOWN=0,DB_TYPE_DIAB_ISAM=1, DB_TYPE_HASH,DB_TYPE_MISAM,DB_TYPE_PISAM, DB_TYPE_RMS_ISAM, DB_TYPE_HEAP, DB_TYPE_ISAM, DB_TYPE_MRG_ISAM, DB_TYPE_MYISAM, DB_TYPE_MRG_MYISAM, DB_TYPE_BERKELEY_DB, DB_TYPE_INNODB, DB_TYPE_GEMINI, DB_TYPE_NDBCLUSTER, DB_TYPE_EXAMPLE_DB, DB_TYPE_ARCHIVE_DB, DB_TYPE_CSV_DB, DB_TYPE_FEDERATED_DB, DB_TYPE_BLACKHOLE_DB, DB_TYPE_PARTITION_DB, DB_TYPE_BINLOG, DB_TYPE_SPARTAN_DB, DB_TYPE_DEFAULT=127 // Must be last };
CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
Open the handler.cc file and modify the show_table_alias_st array. Add the DB_TYPE_ SPARTAN_DB element and string to the bottom of the list, above the UNKNOWN database type element. Order does not matter, but convention shows MySQL AB uses the last element as a sentinel so you should not make it the last element. The following shows the correct code statements: struct show_table_alias_st sys_table_aliases[]= { {"INNOBASE", DB_TYPE_INNODB}, {"NDB", DB_TYPE_NDBCLUSTER}, {"BDB", DB_TYPE_BERKELEY_DB}, {"HEAP", DB_TYPE_HEAP}, {"MERGE", DB_TYPE_MRG_MYISAM}, {"SPARTAN", DB_TYPE_SPARTAN_DB}, {NullS, DB_TYPE_UNKNOWN} }; Open the handler-win.cpp file and add the #ifdef and extern statements to the file (Windows only). Copy and paste the #ifdef statements for the example storage engine, then make the replacements. The following shows the correct code statements: #ifdef WITH_SPARTAN_STORAGE_ENGINE extern handlerton spartan_hton; #endif You also need to modify the sys_table_types structure and add the #ifdef for the Spartan engine (Windows only). Copy and paste the #ifdef statements for the example storage engine and then make the replacements. Here are the correct code statements: handlerton *sys_table_types[]= { &heap_hton, &myisam_hton, ... #ifdef WITH_SPARTAN_STORAGE_ENGINE &spartan_hton, #endif Open the mysql_priv.h file and add the #ifdef for the Spartan engine. Copy and paste the #ifdef statements for the example storage engine and make the replacements. The following are the correct code statements: #ifdef WITH_SPARTAN_STORAGE_ENGINE extern handlerton spartan_hton; #define have_spartan_db spartan_hton.state #else extern SHOW_COMP_OPTION have_spartan_db; #endif
CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
Open the set_var.cc file and add the sys_var_have_variable array for the Spartan engine. Copy and paste the statements for the example storage engine and then make the replacements. The correct code statements are as follows: sys_var_have_variable sys_have_spartan_db("have_spartan_engine", &have_spartan_db); You also need to add the sys_have_spartan_db.name definition to the init_vars array. Again, copy and paste the statements for the example storage engine and then make the replacements. The following shows the correct code statements: SHOW_VAR init_vars[]= { {"auto_increment_increment", (char*) &sys_auto_increment_increment, SHOW_SYS}, {"auto_increment_offset", (char*) &sys_auto_increment_offset, SHOW_SYS}, ... {sys_have_example_db.name, (char*) &have_example_db, SHOW_HAVE}, {sys_have_spartan_db.name, (char*) &have_spartan_db, SHOW_HAVE}, {sys_have_federated_db.name,(char*) &have_federated_db, SHOW_HAVE}, ... The last file you need to modify is mysqld.cc. Open the file and add the #undef statement for the Spartan engine. You also need to set the SHOW_COMP_OPTION located below the #undef statements. Copy and paste the statements for the example storage engine, then make the replacements. Here are the correct code statements: /***************************************************************************** Instantiate have_xyx for missing storage engines *****************************************************************************/ #undef have_berkeley_db #undef have_innodb #undef have_ndbcluster #undef have_example_db #undef have_spartan_db #undef have_archive_db #undef have_csv_db #undef have_federated_db #undef have_partition_db #undef have_blackhole_db SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION SHOW_COMP_OPTION have_berkeley_db= SHOW_OPTION_NO; have_innodb= SHOW_OPTION_NO; have_ndbcluster= SHOW_OPTION_NO; have_example_db= SHOW_OPTION_NO; have_spartan_db= SHOW_OPTION_NO; have_archive_db= SHOW_OPTION_NO; have_csv_db= SHOW_OPTION_NO; have_federated_db= SHOW_OPTION_NO; have_partition_db= SHOW_OPTION_NO; have_blackhole_db= SHOW_OPTION_NO;
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