• Drop procedure/function語句用來刪除指定名稱的存儲過程或函數
• If exists關鍵詞用來避免在刪除一個本身不存在的存儲過程或函數時，MySQL返回錯誤
• mysql> drop procedure simpleproc; • Query OK, 0 rows affected (0.00 sec) • mysql> drop function if exists simplefunc; • Query OK, 0 rows affected (0.00 sec)
mysql> use information_schema; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> show tables; +---------------------------------------+ | Tables_in_information_schema | +---------------------------------------+ | CHARACTER_SETS | | COLLATIONS | | COLLATION_CHARACTER_SET_APPLICABILITY | | COLUMNS | | COLUMN_PRIVILEGES | | COLUMN_STATISTICS | | ENGINES | | EVENTS | | FILES | | INNODB_BUFFER_PAGE | | INNODB_BUFFER_PAGE_LRU | | INNODB_BUFFER_POOL_STATS | | INNODB_CACHED_INDEXES | | INNODB_CMP | | INNODB_CMPMEM | | INNODB_CMPMEM_RESET | | INNODB_CMP_PER_INDEX | | INNODB_CMP_PER_INDEX_RESET | | INNODB_CMP_RESET | | INNODB_COLUMNS | | INNODB_DATAFILES | | INNODB_FIELDS | | INNODB_FOREIGN | | INNODB_FOREIGN_COLS | | INNODB_FT_BEING_DELETED | | INNODB_FT_CONFIG | | INNODB_FT_DEFAULT_STOPWORD | | INNODB_FT_DELETED | | INNODB_FT_INDEX_CACHE | | INNODB_FT_INDEX_TABLE | | INNODB_INDEXES | | INNODB_METRICS | | INNODB_SESSION_TEMP_TABLESPACES | | INNODB_TABLES | | INNODB_TABLESPACES | | INNODB_TABLESPACES_BRIEF | | INNODB_TABLESTATS | | INNODB_TEMP_TABLE_INFO | | INNODB_TRX | | INNODB_VIRTUAL | | KEYWORDS | | KEY_COLUMN_USAGE | | OPTIMIZER_TRACE | | PARAMETERS | | PARTITIONS | | PLUGINS | | PROCESSLIST | | PROFILING | | REFERENTIAL_CONSTRAINTS | | RESOURCE_GROUPS | | ROUTINES | | SCHEMATA | | SCHEMA_PRIVILEGES | | STATISTICS | | ST_GEOMETRY_COLUMNS | | ST_SPATIAL_REFERENCE_SYSTEMS | | TABLES | | TABLESPACES | | TABLE_CONSTRAINTS | | TABLE_PRIVILEGES | | TRIGGERS | | USER_PRIVILEGES | | VIEWS | | VIEW_ROUTINE_USAGE | | VIEW_TABLE_USAGE | +---------------------------------------+ rows in set (0.01 sec) mysql> desc routines; +--------------------------+---------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------------------+---------------------------+------+-----+---------+-------+ | SPECIFIC_NAME | varchar(64) | NO | | NULL | | | ROUTINE_CATALOG | varchar(64) | NO | | NULL | | | ROUTINE_SCHEMA | varchar(64) | NO | | NULL | | | ROUTINE_NAME | varchar(64) | NO | | NULL | | | ROUTINE_TYPE | enum('FUNCTION','PROCEDURE') | NO | | NULL | | | DATA_TYPE | longtext | YES | | NULL | | | CHARACTER_MAXIMUM_LENGTH | bigint(21) | YES | | NULL | | | CHARACTER_OCTET_LENGTH | bigint(21) | YES | | NULL | | | NUMERIC_PRECISION | int(10) unsigned | YES | | NULL | | | NUMERIC_SCALE | int(10) unsigned | YES | | NULL | | | DATETIME_PRECISION | int(10) unsigned | YES | | NULL | | | CHARACTER_SET_NAME | varchar(64) | YES | | NULL | | | COLLATION_NAME | varchar(64) | YES | | NULL | | | DTD_IDENTIFIER | longtext | YES | | NULL | | | ROUTINE_BODY | varchar(3) | NO | | | | | ROUTINE_DEFINITION | longtext | YES | | NULL | | | EXTERNAL_NAME | binary(0) | YES | | NULL | | | EXTERNAL_LANGUAGE | varchar(64) | NO | | SQL | | | PARAMETER_STYLE | varchar(3) | NO | | | | | IS_DETERMINISTIC | varchar(3) | NO | | | | | SQL_DATA_ACCESS | enum('CONTAINS SQL','NO SQL','READS SQL DATA','MODIFIES SQL DATA') | NO | | NULL | | | SQL_PATH | binary(0) | YES | | NULL | | | SECURITY_TYPE | enum('DEFAULT','INVOKER','DEFINER') | NO | | NULL | | | CREATED | timestamp | NO | | NULL | | | LAST_ALTERED | timestamp | NO | | NULL | | | SQL_MODE | set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY',
'NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','NOT_USED_9','NOT_USED_10','NOT_USED_11','NOT_USED_12',
'NOT_USED_13','NOT_USED_14','NOT_USED_15','NOT_USED_16','NOT_USED_17','NOT_USED_18','ANSI','NO_AUTO_VALUE_ON_ZERO',
'NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES',
'ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NOT_USED_29','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION',
'PAD_CHAR_TO_FULL_LENGTH','TIME_TRUNCATE_FRACTIONAL') | NO | | NULL | | | ROUTINE_COMMENT | text | NO | | NULL | | | DEFINER | varchar(93) | NO | | NULL | | | CHARACTER_SET_CLIENT | varchar(64) | NO | | NULL | | | COLLATION_CONNECTION | varchar(64) | NO | | NULL | | | DATABASE_COLLATION | varchar(64) | NO | | NULL | | +--------------------------+------------------------+------+-----+---------+-------+ rows in set (0.01 sec) mysql> select * from routines limit 1; +-------------------------------+-----------------+----------------+-------------------------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+--------------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+---------+---------------+---------------------+----------------------+----------------------+--------------------+ | SPECIFIC_NAME | ROUTINE_CATALOG | ROUTINE_SCHEMA | ROUTINE_NAME | ROUTINE_TYPE | DATA_TYPE | CHARACTER_MAXIMUM_LENGTH | CHARACTER_OCTET_LENGTH | NUMERIC_PRECISION | NUMERIC_SCALE | DATETIME_PRECISION | CHARACTER_SET_NAME | COLLATION_NAME | DTD_IDENTIFIER | ROUTINE_BODY | ROUTINE_DEFINITION | EXTERNAL_NAME | EXTERNAL_LANGUAGE | PARAMETER_STYLE | IS_DETERMINISTIC | SQL_DATA_ACCESS | SQL_PATH | SECURITY_TYPE | CREATED | LAST_ALTERED | SQL_MODE| ROUTINE_COMMENT | DEFINER | CHARACTER_SET_CLIENT | COLLATION_CONNECTION | DATABASE_COLLATION | +-------------------------------+-----------------+----------------+-------------------------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+--------------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+---------------------+----------------------+----------------------+--------------------+ | extract_schema_from_file_name | def | sys | extract_schema_from_file_name | FUNCTION | varchar | 64 | 256 | NULL | NULL | NULL | utf8mb4 | utf8mb4_0900_ai_ci | varchar(64) | SQL | BEGIN RETURN LEFT(SUBSTRING_INDEX(SUBSTRING_INDEX(REPLACE(path, '\', '/'), '/', -2), '/', 1), 64); END | NULL | SQL | SQL | YES | NO SQL | NULL | INVOKER | 2020-04-06 19:21:37 | 2020-04-06 19:21:37 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | Description Takes a raw file path, and attempts to extract the schema name from it. Useful for when interacting with Performance Schema data concerning IO statistics, for example. Currently relies on the fact that a table data file will be within a specified database directory (will not work with partitions or tables that specify an individual DATA_DIRECTORY). Parameters path (VARCHAR(512)): The full file path to a data file to extract the schema name from. Returns VARCHAR(64) Example mysql> SELECT sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd'); +----------------------------------------------------------------------------+ | sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd') | +----------------------------------------------------------------------------+ | employees | +----------------------------------------------------------------------------+ row in set (0.00 sec) | mysql.sys@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | +-------------------------------+-----------------+----------------+-------------------------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+--------------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-------+---------------------+----------------------+----------------------+--------------------+ row in set (0.01 sec) mysql> select * from routines where routine_name='simpleproc'; +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | SPECIFIC_NAME | ROUTINE_CATALOG | ROUTINE_SCHEMA | ROUTINE_NAME | ROUTINE_TYPE | DATA_TYPE | CHARACTER_MAXIMUM_LENGTH | CHARACTER_OCTET_LENGTH | NUMERIC_PRECISION | NUMERIC_SCALE | DATETIME_PRECISION | CHARACTER_SET_NAME | COLLATION_NAME | DTD_IDENTIFIER | ROUTINE_BODY | ROUTINE_DEFINITION | EXTERNAL_NAME | EXTERNAL_LANGUAGE | PARAMETER_STYLE | IS_DETERMINISTIC | SQL_DATA_ACCESS | SQL_PATH | SECURITY_TYPE | CREATED | LAST_ALTERED | SQL_MODE | ROUTINE_COMMENT | DEFINER | CHARACTER_SET_CLIENT | COLLATION_CONNECTION | DATABASE_COLLATION | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | simpleproc | def | course | simpleproc | PROCEDURE | | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | SQL | BEGIN select count(*) into param2 from students where sid>param1; END | NULL | SQL | SQL | NO | CONTAINS SQL | NULL | DEFINER | 2020-04-19 17:17:12 | 2020-04-19 17:17:12 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | | root@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ row in set (0.04 sec) mysql> select * from routines where routine_name='simpleproc' and routine_schema='course'; +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | SPECIFIC_NAME | ROUTINE_CATALOG | ROUTINE_SCHEMA | ROUTINE_NAME | ROUTINE_TYPE | DATA_TYPE | CHARACTER_MAXIMUM_LENGTH | CHARACTER_OCTET_LENGTH | NUMERIC_PRECISION | NUMERIC_SCALE | DATETIME_PRECISION | CHARACTER_SET_NAME | COLLATION_NAME | DTD_IDENTIFIER | ROUTINE_BODY | ROUTINE_DEFINITION | EXTERNAL_NAME | EXTERNAL_LANGUAGE | PARAMETER_STYLE | IS_DETERMINISTIC | SQL_DATA_ACCESS | SQL_PATH | SECURITY_TYPE | CREATED | LAST_ALTERED | SQL_MODE | ROUTINE_COMMENT | DEFINER | CHARACTER_SET_CLIENT | COLLATION_CONNECTION | DATABASE_COLLATION | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | simpleproc | def | course | simpleproc | PROCEDURE | | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | SQL | BEGIN select count(*) into param2 from students where sid>param1; END | NULL | SQL | SQL | NO | CONTAINS SQL | NULL | DEFINER | 2020-04-19 17:17:12 | 2020-04-19 17:17:12 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | | root@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+----------------+----------------+--------------+-----------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ row in set (0.00 sec) mysql> select * from routines where routine_schema='course'; +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+-------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | SPECIFIC_NAME | ROUTINE_CATALOG | ROUTINE_SCHEMA | ROUTINE_NAME | ROUTINE_TYPE | DATA_TYPE | CHARACTER_MAXIMUM_LENGTH | CHARACTER_OCTET_LENGTH | NUMERIC_PRECISION | NUMERIC_SCALE | DATETIME_PRECISION | CHARACTER_SET_NAME | COLLATION_NAME | DTD_IDENTIFIER | ROUTINE_BODY | ROUTINE_DEFINITION | EXTERNAL_NAME | EXTERNAL_LANGUAGE | PARAMETER_STYLE | IS_DETERMINISTIC | SQL_DATA_ACCESS | SQL_PATH | SECURITY_TYPE | CREATED | LAST_ALTERED | SQL_MODE | ROUTINE_COMMENT | DEFINER | CHARACTER_SET_CLIENT | COLLATION_CONNECTION | DATABASE_COLLATION | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+-------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ | hello | def | course | hello | FUNCTION | char | 50 | 200 | NULL | NULL | NULL | utf8mb4 | utf8mb4_0900_ai_ci | char(50) | SQL | return concat('Hello, ',s,'!') | NULL | SQL | SQL | NO | CONTAINS SQL | NULL | DEFINER | 2020-04-19 17:42:21 | 2020-04-19 17:42:21 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | | root@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | | simpleproc | def | course | simpleproc | PROCEDURE | | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | SQL | BEGIN select count(*) into param2 from students where sid>param1; END | NULL | SQL | SQL | NO | CONTAINS SQL | NULL | DEFINER | 2020-04-19 17:17:12 | 2020-04-19 17:17:12 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | | root@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | | simpleproc2 | def | course | simpleproc2 | PROCEDURE | | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | SQL | begin select count(*) from students where sid>1; select count(*) from students where sid>2; end | NULL | SQL | SQL | NO | CONTAINS SQL | NULL | DEFINER | 2020-04-19 17:56:18 | 2020-04-19 17:56:18 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION | | root@localhost | utf8mb4 | utf8mb4_0900_ai_ci | utf8mb4_0900_ai_ci | +---------------+-----------------+----------------+--------------+--------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+--------------------+----------------+--------------+-------------------------------------------------------------------------------------------------+---------------+-------------------+-----------------+------------------+-----------------+----------+---------------+---------------------+---------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------------+----------------------+--------------------+ rows in set (0.00 sec) mysql> select routine_name from routines where routine_schema='course'; +--------------+ | ROUTINE_NAME | +--------------+ | hello | | simpleproc | | simpleproc2 | +--------------+ rows in set (0.00 sec) mysql> select routine_name,routine_type from routines where routine_schema='course'; +--------------+--------------+ | ROUTINE_NAME | ROUTINE_TYPE | +--------------+--------------+ | hello | FUNCTION | | simpleproc | PROCEDURE | | simpleproc2 | PROCEDURE | +--------------+--------------+ rows in set (0.01 sec) mysql> use course; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select routine_name,routine_type from information_schema.routines where routine_schema='course'; +--------------+--------------+ | ROUTINE_NAME | ROUTINE_TYPE | +--------------+--------------+ | hello | FUNCTION | | simpleproc | PROCEDURE | | simpleproc2 | PROCEDURE | +--------------+--------------+ rows in set (0.01 sec)