diff options
Diffstat (limited to 'storage/example')
| -rw-r--r-- | storage/example/ha_example.cc | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/storage/example/ha_example.cc b/storage/example/ha_example.cc index 3b0100510b8..c4ed4d5d2c2 100644 --- a/storage/example/ha_example.cc +++ b/storage/example/ha_example.cc @@ -103,6 +103,12 @@ static handler *example_create_handler(handlerton *hton, handlerton *example_hton; +/* Interface to mysqld, to check system tables supported by SE */ +static const char* example_system_database(); +static bool example_is_supported_system_table(const char *db, + const char *table_name, + bool is_sql_layer_system_table); + /* Variables for example share methods */ /* @@ -165,6 +171,8 @@ static int example_init_func(void *p) example_hton->state= SHOW_OPTION_YES; example_hton->create= example_create_handler; example_hton->flags= HTON_CAN_RECREATE; + example_hton->system_database= example_system_database; + example_hton->is_supported_system_table= example_is_supported_system_table; DBUG_RETURN(0); } @@ -298,6 +306,65 @@ const char **ha_example::bas_ext() const return ha_example_exts; } +/* + Following handler function provides access to + system database specific to SE. This interface + is optional, so every SE need not implement it. +*/ +const char* ha_example_system_database= NULL; +const char* example_system_database() +{ + return ha_example_system_database; +} + +/* + List of all system tables specific to the SE. + Array element would look like below, + { "<database_name>", "<system table name>" }, + The last element MUST be, + { (const char*)NULL, (const char*)NULL } + + This array is optional, so every SE need not implement it. +*/ +static st_system_tablename ha_example_system_tables[]= { + {(const char*)NULL, (const char*)NULL} +}; + +/** + @brief Check if the given db.tablename is a system table for this SE. + + @param db Database name to check. + @param table_name table name to check. + @param is_sql_layer_system_table if the supplied db.table_name is a SQL + layer system table. + + @return + @retval TRUE Given db.table_name is supported system table. + @retval FALSE Given db.table_name is not a supported system table. +*/ +static bool example_is_supported_system_table(const char *db, + const char *table_name, + bool is_sql_layer_system_table) +{ + st_system_tablename *systab; + + // Does this SE support "ALL" SQL layer system tables ? + if (is_sql_layer_system_table) + return false; + + // Check if this is SE layer system tables + systab= ha_example_system_tables; + while (systab && systab->db) + { + if (systab->db == db && + strcmp(systab->tablename, table_name) == 0) + return true; + systab++; + } + + return false; +} + /** @brief |