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138 lines
4.5 KiB
138 lines
4.5 KiB
create
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definer = `mysql.sys`@localhost procedure sys.create_synonym_db(IN in_db_name varchar(64), IN in_synonym varchar(64))
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comment '
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Description
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-----------
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Takes a source database name and synonym name, and then creates the
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synonym database with views that point to all of the tables within
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the source database.
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Useful for creating a "ps" synonym for "performance_schema",
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or "is" instead of "information_schema", for example.
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Parameters
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-----------
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in_db_name (VARCHAR(64)):
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The database name that you would like to create a synonym for.
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in_synonym (VARCHAR(64)):
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The database synonym name.
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Example
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-----------
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mysql> SHOW DATABASES;
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+--------------------+
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| Database |
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+--------------------+
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| information_schema |
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| mysql |
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| performance_schema |
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| sys |
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| test |
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+--------------------+
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5 rows in set (0.00 sec)
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mysql> CALL sys.create_synonym_db(''performance_schema'', ''ps'');
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+---------------------------------------+
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| summary |
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+---------------------------------------+
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| Created 74 views in the `ps` database |
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+---------------------------------------+
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1 row in set (8.57 sec)
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Query OK, 0 rows affected (8.57 sec)
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mysql> SHOW DATABASES;
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+--------------------+
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| Database |
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+--------------------+
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| information_schema |
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| mysql |
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| performance_schema |
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| ps |
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| sys |
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| test |
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+--------------------+
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6 rows in set (0.00 sec)
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mysql> SHOW FULL TABLES FROM ps;
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+------------------------------------------------------+------------+
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| Tables_in_ps | Table_type |
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+------------------------------------------------------+------------+
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| accounts | VIEW |
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| cond_instances | VIEW |
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| events_stages_current | VIEW |
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| events_stages_history | VIEW |
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...
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'
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sql security invoker
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modifies sql data
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BEGIN
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DECLARE v_done bool DEFAULT FALSE;
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DECLARE v_db_name_check VARCHAR(64);
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DECLARE v_db_err_msg TEXT;
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DECLARE v_table VARCHAR(64);
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DECLARE v_views_created INT DEFAULT 0;
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DECLARE db_doesnt_exist CONDITION FOR SQLSTATE '42000';
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DECLARE db_name_exists CONDITION FOR SQLSTATE 'HY000';
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DECLARE c_table_names CURSOR FOR
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SELECT TABLE_NAME
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FROM INFORMATION_SCHEMA.TABLES
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WHERE TABLE_SCHEMA = in_db_name;
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DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_done = TRUE;
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-- Check if the source database exists
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SELECT SCHEMA_NAME INTO v_db_name_check
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FROM INFORMATION_SCHEMA.SCHEMATA
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WHERE SCHEMA_NAME = in_db_name;
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IF v_db_name_check IS NULL THEN
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SET v_db_err_msg = CONCAT('Unknown database ', in_db_name);
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SIGNAL SQLSTATE 'HY000'
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SET MESSAGE_TEXT = v_db_err_msg;
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END IF;
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-- Check if a database of the synonym name already exists
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SELECT SCHEMA_NAME INTO v_db_name_check
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FROM INFORMATION_SCHEMA.SCHEMATA
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WHERE SCHEMA_NAME = in_synonym;
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IF v_db_name_check = in_synonym THEN
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SET v_db_err_msg = CONCAT('Can\'t create database ', in_synonym, '; database exists');
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SIGNAL SQLSTATE 'HY000'
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SET MESSAGE_TEXT = v_db_err_msg;
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END IF;
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-- All good, create the database and views
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SET @create_db_stmt := CONCAT('CREATE DATABASE ', sys.quote_identifier(in_synonym));
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PREPARE create_db_stmt FROM @create_db_stmt;
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EXECUTE create_db_stmt;
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DEALLOCATE PREPARE create_db_stmt;
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SET v_done = FALSE;
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OPEN c_table_names;
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c_table_names: LOOP
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FETCH c_table_names INTO v_table;
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IF v_done THEN
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LEAVE c_table_names;
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END IF;
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SET @create_view_stmt = CONCAT(
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'CREATE SQL SECURITY INVOKER VIEW ',
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sys.quote_identifier(in_synonym),
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'.',
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sys.quote_identifier(v_table),
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' AS SELECT * FROM ',
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sys.quote_identifier(in_db_name),
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'.',
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sys.quote_identifier(v_table)
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);
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PREPARE create_view_stmt FROM @create_view_stmt;
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EXECUTE create_view_stmt;
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DEALLOCATE PREPARE create_view_stmt;
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SET v_views_created = v_views_created + 1;
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END LOOP;
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CLOSE c_table_names;
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SELECT CONCAT(
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'Created ', v_views_created, ' view',
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IF(v_views_created != 1, 's', ''), ' in the ',
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sys.quote_identifier(in_synonym), ' database'
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) AS summary;
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END;
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