MySQL/MariaDB数据库的存储过程

　　　　　　　　　MySQL/MariaDB数据库的存储过程

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

一.存储过程概述

1>.存储过程优势

　　存储过程把经常使用的SQL语句或业务逻辑封装起来,预编译保存在数据库中,当需要时从数据库中直接调用,省去了编译的过程

　　提高了运行速度


　　同时降低网络数据传输量

2>.存储过程与自定义函数的区别

　　存储过程实现的过程要复杂一些,而函数的针对性较强


　　存储过程可以有多个返回值,而自定义函数只有一个返回值


　　存储过程一般独立的来执行,而函数往往是作为其他SQL语句的一部分来使用

3>.存储过程存储位置

　　存储过程保存在mysql.proc表中。

MariaDB [yinzhengjie]> SELECT * FROM mysql.proc\G　　　　　　　　　　#不难发现存储过程和函数都保存在该表中。

*************************** 1. row ***************************

                  db: mysql

                name: AddGeometryColumn

                type: PROCEDURE

       specific_name: AddGeometryColumn

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list: catalog varchar(64), t_schema varchar(64),

   t_name varchar(64), geometry_column varchar(64), t_srid int

             returns:

                body: begin

  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' ADD ', geometry_column,' GEOMETRY REF_SYSTEM_ID=', t_srid); PREPARE ls from @qwe; exe

cute ls; deallocate prepare ls; end             definer: root@localhost

             created: 2019-10-26 22:17:15

            modified: 2019-10-26 22:17:15

            sql_mode:

             comment:

character_set_client: utf8

collation_connection: utf8_general_ci

        db_collation: latin1_swedish_ci

           body_utf8: begin

  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' ADD ', geometry_column,' GEOMETRY REF_SYSTEM_ID=', t_srid); PREPARE ls from @qwe; exe

cute ls; deallocate prepare ls; end*************************** 2. row ***************************

                  db: mysql

                name: DropGeometryColumn

                type: PROCEDURE

       specific_name: DropGeometryColumn

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list: catalog varchar(64), t_schema varchar(64),

   t_name varchar(64), geometry_column varchar(64)

             returns:

                body: begin

  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' DROP ', geometry_column); PREPARE ls from @qwe; execute ls; deallocate prepare ls; en

d             definer: root@localhost

             created: 2019-10-26 22:17:15

            modified: 2019-10-26 22:17:15

            sql_mode:

             comment:

character_set_client: utf8

collation_connection: utf8_general_ci

        db_collation: latin1_swedish_ci

           body_utf8: begin

  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' DROP ', geometry_column); PREPARE ls from @qwe; execute ls; deallocate prepare ls; en

d*************************** 3. row ***************************

                  db: yinzhengjie

                name: students_numbers

                type: FUNCTION

       specific_name: students_numbers

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list:

             returns: smallint(6)

                body: BEGIN

DECLARE x SMALLINT;

SELECT COUNT(StuID) FROM students INTO x;

RETURN x;

END

             definer: root@localhost

             created: 2019-10-28 20:38:19

            modified: 2019-10-28 20:38:19

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

        db_collation: utf8_general_ci

           body_utf8: BEGIN

DECLARE x SMALLINT;

SELECT COUNT(StuID) FROM students INTO x;

RETURN x;

END

*************************** 4. row ***************************

                  db: yinzhengjie

                name: deleteById

                type: FUNCTION

       specific_name: deleteById

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list: uid SMALLINT UNSIGNED

             returns: varchar(100) CHARSET utf8

                body: BEGIN

DELETE FROM students WHERE stuid = uid;

RETURN (SELECT COUNT(stuid) FROM students);

END

             definer: root@localhost

             created: 2019-10-28 20:06:27

            modified: 2019-10-28 20:06:27

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

        db_collation: utf8_general_ci

           body_utf8: BEGIN

DELETE FROM students WHERE stuid = uid;

RETURN (SELECT COUNT(stuid) FROM students);

END

*************************** 5. row ***************************

                  db: yinzhengjie

                name: addTwoNumber

                type: FUNCTION

       specific_name: addTwoNumber

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list: x SMALLINT UNSIGNED, Y SMALLINT UNSIGNED

             returns: smallint(6)

                body: BEGIN

DECLARE a, b SMALLINT UNSIGNED;

SET a = x, b = y;

RETURN a+b;

END

             definer: root@localhost

             created: 2019-10-28 20:13:59

            modified: 2019-10-28 20:13:59

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

        db_collation: utf8_general_ci

           body_utf8: BEGIN

DECLARE a, b SMALLINT UNSIGNED;

SET a = x, b = y;

RETURN a+b;

END

*************************** 6. row ***************************

                  db: yinzhengjie

                name: showTime

                type: PROCEDURE

       specific_name: showTime

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list:

             returns:

                body: BEGIN

SELECT now();

END

             definer: root@localhost

             created: 2019-10-28 20:49:09

            modified: 2019-10-28 20:49:09

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

        db_collation: utf8_general_ci

           body_utf8: BEGIN

SELECT now();

END

*************************** 7. row ***************************

                  db: yinzhengjie

                name: dorepeat

                type: PROCEDURE

       specific_name: dorepeat

            language: SQL

     sql_data_access: CONTAINS_SQL

    is_deterministic: NO

       security_type: DEFINER

          param_list: n INT

             returns:

                body: BEGIN

SET @i = 0;

SET @sum = 0;

REPEAT SET @sum = @sum+@i; SET @i = @i + 1;

UNTIL @i > n END REPEAT;

END

             definer: root@localhost

             created: 2019-10-28 21:32:01

            modified: 2019-10-28 21:32:01

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

        db_collation: utf8_general_ci

           body_utf8: BEGIN

SET @i = 0;

SET @sum = 0;

REPEAT SET @sum = @sum+@i; SET @i = @i + 1;

UNTIL @i > n END REPEAT;

END

7 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SELECT * FROM mysql.proc\G　　　　　　　　　　#不难发现存储过程和函数都保存在该表中。

二.存储过程实战

MariaDB [yinzhengjie]> HELP CREATE PROCEDURE;

Name: 'CREATE PROCEDURE'

Description:

Syntax:

CREATE

    [DEFINER = { user | CURRENT_USER }]

    PROCEDURE sp_name ([proc_parameter[,...]])

    [characteristic ...] routine_body

CREATE

    [DEFINER = { user | CURRENT_USER }]

    FUNCTION sp_name ([func_parameter[,...]])

    RETURNS type

    [characteristic ...] routine_body

proc_parameter:

    [ IN | OUT | INOUT ] param_name type

func_parameter:

    param_name type

type:

    Any valid MySQL data type

characteristic:

    COMMENT 'string'

  | LANGUAGE SQL

  | [NOT] DETERMINISTIC

  | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }

  | SQL SECURITY { DEFINER | INVOKER }

routine_body:

    Valid SQL routine statement

These statements create stored routines. By default, a routine is

associated with the default database. To associate the routine

explicitly with a given database, specify the name as db_name.sp_name

when you create it.

The CREATE FUNCTION statement is also used in MySQL to support UDFs

(user-defined functions). See

https://mariadb.com/kb/en/create-function-udf/. A UDF can

be regarded as an external stored function. Stored functions share

their namespace with UDFs. See

http://dev.mysql.com/doc/refman/5.5/en/function-resolution.html, for

the rules describing how the server interprets references to different

kinds of functions.

To invoke a stored procedure, use the CALL statement (see [HELP CALL]).

To invoke a stored function, refer to it in an expression. The function

returns a value during expression evaluation.

CREATE PROCEDURE and CREATE FUNCTION require the CREATE ROUTINE

privilege. They might also require the SUPER privilege, depending on

the DEFINER value, as described later in this section. If binary

logging is enabled, CREATE FUNCTION might require the SUPER privilege,

as described in

https://mariadb.com/kb/en/binary-logging-of-stored-routines/.

By default, MySQL automatically grants the ALTER ROUTINE and EXECUTE

privileges to the routine creator. This behavior can be changed by

disabling the automatic_sp_privileges system variable. See

https://mariadb.com/kb/en/stored-routine-privileges/.

The DEFINER and SQL SECURITY clauses specify the security context to be

used when checking access privileges at routine execution time, as

described later in this section.

If the routine name is the same as the name of a built-in SQL function,

a syntax error occurs unless you use a space between the name and the

following parenthesis when defining the routine or invoking it later.

For this reason, avoid using the names of existing SQL functions for

your own stored routines.

The IGNORE_SPACE SQL mode applies to built-in functions, not to stored

routines. It is always permissible to have spaces after a stored

routine name, regardless of whether IGNORE_SPACE is enabled.

The parameter list enclosed within parentheses must always be present.

If there are no parameters, an empty parameter list of () should be

used. Parameter names are not case sensitive.

Each parameter is an IN parameter by default. To specify otherwise for

a parameter, use the keyword OUT or INOUT before the parameter name.

*Note*: Specifying a parameter as IN, OUT, or INOUT is valid only for a

PROCEDURE. For a FUNCTION, parameters are always regarded as IN

parameters.

An IN parameter passes a value into a procedure. The procedure might

modify the value, but the modification is not visible to the caller

when the procedure returns. An OUT parameter passes a value from the

procedure back to the caller. Its initial value is NULL within the

procedure, and its value is visible to the caller when the procedure

returns. An INOUT parameter is initialized by the caller, can be

modified by the procedure, and any change made by the procedure is

visible to the caller when the procedure returns.

For each OUT or INOUT parameter, pass a user-defined variable in the

CALL statement that invokes the procedure so that you can obtain its

value when the procedure returns. If you are calling the procedure from

within another stored procedure or function, you can also pass a

routine parameter or local routine variable as an IN or INOUT

parameter.

The following example shows a simple stored procedure that uses an OUT

parameter:

MariaDB> delimiter //

MariaDB> CREATE PROCEDURE simpleproc (OUT param1 INT)

    -> BEGIN

    ->   SELECT COUNT(*) INTO param1 FROM t;

    -> END//

Query OK, 0 rows affected (0.00 sec)

MariaDB> delimiter ;

MariaDB> CALL simpleproc(@a);

Query OK, 0 rows affected (0.00 sec)

MariaDB> SELECT @a;

+------+

| @a   |

+------+

| 3    |

+------+

1 row in set (0.00 sec)

The example uses the mysql client delimiter command to change the

statement delimiter from ; to // while the procedure is being defined.

This enables the ; delimiter used in the procedure body to be passed

through to the server rather than being interpreted by mysql itself.

See

https://mariadb.com/kb/en/stored-procedure-overview/.

The RETURNS clause may be specified only for a FUNCTION, for which it

is mandatory. It indicates the return type of the function, and the

function body must contain a RETURN value statement. If the RETURN

statement returns a value of a different type, the value is coerced to

the proper type. For example, if a function specifies an ENUM or SET

value in the RETURNS clause, but the RETURN statement returns an

integer, the value returned from the function is the string for the

corresponding ENUM member of set of SET members.

The following example function takes a parameter, performs an operation

using an SQL function, and returns the result. In this case, it is

unnecessary to use delimiter because the function definition contains

no internal ; statement delimiters:

MariaDB> CREATE FUNCTION hello (s CHAR(20))

MariaDB> RETURNS CHAR(50) DETERMINISTIC

    -> RETURN CONCAT('Hello, ',s,'!');

Query OK, 0 rows affected (0.00 sec)

MariaDB> SELECT hello('world');

+----------------+

| hello('world') |

+----------------+

| Hello, world!  |

+----------------+

1 row in set (0.00 sec)

Parameter types and function return types can be declared to use any

valid data type, except that the COLLATE attribute cannot be used prior

to MySQL 5.5.3. As of 5.5.3, COLLATE can be used if preceded by the

CHARACTER SET attribute.

The routine_body consists of a valid SQL routine statement. This can be

a simple statement such as SELECT or INSERT, or a compound statement

written using BEGIN and END. Compound statements can contain

declarations, loops, and other control structure statements. The syntax

for these statements is described in

https://mariadb.com/kb/programmatic-and-compound-statements.

MySQL permits routines to contain DDL statements, such as CREATE and

DROP. MySQL also permits stored procedures (but not stored functions)

to contain SQL transaction statements such as COMMIT. Stored functions

may not contain statements that perform explicit or implicit commit or

rollback. Support for these statements is not required by the SQL

standard, which states that each DBMS vendor may decide whether to

permit them.

Statements that return a result set can be used within a stored

procedure but not within a stored function. This prohibition includes

SELECT statements that do not have an INTO var_list clause and other

statements such as SHOW, EXPLAIN, and CHECK TABLE. For statements that

can be determined at function definition time to return a result set, a

Not allowed to return a result set from a function error occurs

(ER_SP_NO_RETSET). For statements that can be determined only at

runtime to return a result set, a PROCEDURE %s can't return a result

set in the given context error occurs (ER_SP_BADSELECT).

USE statements within stored routines are not permitted. When a routine

is invoked, an implicit USE db_name is performed (and undone when the

routine terminates). The causes the routine to have the given default

database while it executes. References to objects in databases other

than the routine default database should be qualified with the

appropriate database name.

For additional information about statements that are not permitted in

stored routines, see

https://mariadb.com/kb/en/stored-routine-privileges/

.

For information about invoking stored procedures from within programs

written in a language that has a MySQL interface, see [HELP CALL].

MySQL stores the sql_mode system variable setting that is in effect at

the time a routine is created, and always executes the routine with

this setting in force, regardless of the server SQL mode in effect when

the routine is invoked.

The switch from the SQL mode of the invoker to that of the routine

occurs after evaluation of arguments and assignment of the resulting

values to routine parameters. If you define a routine in strict SQL

mode but invoke it in nonstrict mode, assignment of arguments to

routine parameters does not take place in strict mode. If you require

that expressions passed to a routine be assigned in strict SQL mode,

you should invoke the routine with strict mode in effect.

URL: https://mariadb.com/kb/en/create-procedure/

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> HELP CREATE PROCEDURE;

1>.创建存储过程

MariaDB [yinzhengjie]> DELIMITER  //

MariaDB [yinzhengjie]> CREATE PROCEDURE showTime()

    -> BEGIN

    ->     SELECT now();

    -> END//

Query OK, 0 rows affected (0.01 sec)

MariaDB [yinzhengjie]> DELIMITER  ;

MariaDB [yinzhengjie]>

创建无参存储过程

MariaDB [yinzhengjie]> DELIMITER //

MariaDB [yinzhengjie]> CREATE PROCEDURE selectById(IN uid SMALLINT UNSIGNED)          #需要用户传入一个参数，然后根据用户传入的参数做相应的处理

    -> BEGIN

    ->     SELECT * FROM students WHERE stuid = uid;                                  #根据用户输入的参数查询相应的stuid。

    -> END//

Query OK, 0 rows affected (0.01 sec)

MariaDB [yinzhengjie]> DELIMITER ;

MariaDB [yinzhengjie]>

创建含参存储过程：只有一个IN参数(根据用户输入的数字查询对应表的记录)

MariaDB [yinzhengjie]> DELIMITER //

MariaDB [yinzhengjie]> CREATE PROCEDURE dorepeat(n INT)

    -> BEGIN

    ->     SET @i = 0;　　　　　　#注意此处定义的是会话变量，尽管调用存储过程结束，改变了依旧可以在调用的会话中查询到。

    ->     SET @sum = 0;

    ->     REPEAT SET @sum = @sum+@i; SET @i = @i + 1;　　　　#循环体为重复对sum执行累加操作，步长为1.

    ->     UNTIL @i > n END REPEAT;　　　　　　　　　　　　　　　 #结束循环条件是会话变量"i"的值大于用户传入的参数

    -> END//

Query OK, 0 rows affected (0.01 sec)

MariaDB [yinzhengjie]> DELIMITER ;

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

创建含参存储过程：只有一个IN参数(根据用户输入的数字累加案例)

MariaDB [yinzhengjie]> DELIMITER //

MariaDB [yinzhengjie]> CREATE PROCEDURE deleteById(IN uid SMALLINT UNSIGNED, OUT num SMALLINT UNSIGNED)

    -> BEGIN

    ->     DELETE FROM students WHERE stuid >= uid;

    ->     SELECT row_count() into num;          #将更新的行数保存到num变量中，改变了会随着存储过程调用而传出。

    -> END//

Query OK, 0 rows affected (0.00 sec)

MariaDB [yinzhengjie]> DELIMITER ;

MariaDB [yinzhengjie]> 

说明:

    创建存储过程deleteById,包含一个IN参数和一个OUT参数.调用时,传入删除的ID和保存被修改的行数值的用户变量@Line,select @Line;输出被影响行数

创建含参存储过程:包含IN参数和OUT参数

2>.查看存储过程列表

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS;

+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| Db          | Name               | Type      | Definer        | Modified            | Created             | Security_type | Comment | character

_set_client | collation_connection | Database Collation |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| mysql       | AddGeometryColumn  | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || mysql       | DropGeometryColumn | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || yinzhengjie | deleteById         | PROCEDURE | root@localhost | 2019-10-28 21:23:31 | 2019-10-28 21:23:31 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | dorepeat           | PROCEDURE | root@localhost | 2019-10-28 21:32:01 | 2019-10-28 21:32:01 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | selectById         | PROCEDURE | root@localhost | 2019-10-28 21:21:37 | 2019-10-28 21:21:37 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | showTime           | PROCEDURE | root@localhost | 2019-10-28 20:49:09 | 2019-10-28 20:49:09 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+6 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS;

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS\G

*************************** 1. row ***************************

                  Db: mysql

                Name: AddGeometryColumn

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-26 22:17:15

             Created: 2019-10-26 22:17:15

       Security_type: DEFINER

             Comment:

character_set_client: utf8

collation_connection: utf8_general_ci

  Database Collation: latin1_swedish_ci

*************************** 2. row ***************************

                  Db: mysql

                Name: DropGeometryColumn

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-26 22:17:15

             Created: 2019-10-26 22:17:15

       Security_type: DEFINER

             Comment:

character_set_client: utf8

collation_connection: utf8_general_ci

  Database Collation: latin1_swedish_ci

*************************** 3. row ***************************

                  Db: yinzhengjie

                Name: deleteById

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-28 21:23:31

             Created: 2019-10-28 21:23:31

       Security_type: DEFINER

             Comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

*************************** 4. row ***************************

                  Db: yinzhengjie

                Name: dorepeat

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-28 21:32:01

             Created: 2019-10-28 21:32:01

       Security_type: DEFINER

             Comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

*************************** 5. row ***************************

                  Db: yinzhengjie

                Name: selectById

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-28 21:21:37

             Created: 2019-10-28 21:21:37

       Security_type: DEFINER

             Comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

*************************** 6. row ***************************

                  Db: yinzhengjie

                Name: showTime

                Type: PROCEDURE

             Definer: root@localhost

            Modified: 2019-10-28 20:49:09

             Created: 2019-10-28 20:49:09

       Security_type: DEFINER

             Comment:

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

6 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS\G

3>.查看存储过程定义

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE showTime\G

*************************** 1. row ***************************

           Procedure: showTime

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `showTime`()

BEGIN

SELECT now();

END

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE showTime\G

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE selectById\G

*************************** 1. row ***************************

           Procedure: selectById

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `selectById`(IN uid SMALLINT UNSIGNED)

BEGIN

SELECT * FROM students WHERE stuid = uid;

END

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE selectById\G

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE dorepeat\G

*************************** 1. row ***************************

           Procedure: dorepeat

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `dorepeat`(n INT)

BEGIN

SET @i = 0;

SET @sum = 0;

REPEAT SET @sum = @sum+@i; SET @i = @i + 1;

UNTIL @i > n END REPEAT;

END

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE dorepeat\G

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE deleteById\G

*************************** 1. row ***************************

           Procedure: deleteById

            sql_mode: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `deleteById`(IN uid SMALLINT UNSIGNED, OUT num SMALLINT

 UNSIGNED)BEGIN

DELETE FROM students WHERE stuid >= uid;

SELECT row_count() into num;

END

character_set_client: utf8mb4

collation_connection: utf8mb4_general_ci

  Database Collation: utf8_general_ci

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW CREATE PROCEDURE deleteById\G

4>.调用存储过程

MariaDB [yinzhengjie]> CALL showTime;                     #当无参时,可以省略"()",当有参数时,不可省略"()”

+---------------------+

| now()               |

+---------------------+

| 2019-10-28 21:27:04 |

+---------------------+

1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> CALL showTime; 　　　　#当无参时,可以省略"()",当有参数时,不可省略"()”

MariaDB [yinzhengjie]> SELECT * FROM students;

+-------+---------------+-----+--------+---------+-----------+

| StuID | Name          | Age | Gender | ClassID | TeacherID |

+-------+---------------+-----+--------+---------+-----------+

|     1 | Shi Zhongyu   |  22 | M      |       2 |         3 |

|     2 | Shi Potian    |  22 | M      |       1 |         7 |

|     3 | Xie Yanke     |  53 | M      |       2 |        16 |

|     4 | Ding Dian     |  32 | M      |       4 |         4 |

|     5 | Yu Yutong     |  26 | M      |       3 |         1 |

|     6 | Shi Qing      |  46 | M      |       5 |      NULL |

|     7 | Xi Ren        |  19 | F      |       3 |      NULL |

|     8 | Lin Daiyu     |  17 | F      |       7 |      NULL |

|     9 | Ren Yingying  |  20 | F      |       6 |      NULL |

|    10 | Yue Lingshan  |  19 | F      |       3 |      NULL |

|    11 | Yuan Chengzhi |  23 | M      |       6 |      NULL |

|    12 | Wen Qingqing  |  19 | F      |       1 |      NULL |

|    13 | Tian Boguang  |  33 | M      |       2 |      NULL |

|    14 | Lu Wushuang   |  17 | F      |       3 |      NULL |

|    18 | Hua Rong      |  23 | M      |       7 |      NULL |

|    19 | Xue Baochai   |  18 | F      |       6 |      NULL |

|    20 | Diao Chan     |  19 | F      |       7 |      NULL |

|    21 | Huang Yueying |  22 | F      |       6 |      NULL |

|    22 | Xiao Qiao     |  20 | F      |       1 |      NULL |

|    23 | Ma Chao       |  23 | M      |       4 |      NULL |

|    24 | Xu Xian       |  27 | M      |    NULL |      NULL |

|    25 | Sun Dasheng   | 100 | M      |    NULL |      NULL |

+-------+---------------+-----+--------+---------+-----------+

22 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> call selectById(20);

+-------+-----------+-----+--------+---------+-----------+

| StuID | Name      | Age | Gender | ClassID | TeacherID |

+-------+-----------+-----+--------+---------+-----------+

|    20 | Diao Chan |  19 | F      |       7 |      NULL |

+-------+-----------+-----+--------+---------+-----------+

1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> call selectById(20);

MariaDB [yinzhengjie]> CALL dorepeat(200);

Query OK, 0 rows affected (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SELECT @sum;

+-------+

| @sum  |

+-------+

| 20100 |

+-------+

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SELECT @i;

+------+

| @i   |

+------+

|  201 |

+------+

1 row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> CALL dorepeat(200);

MariaDB [yinzhengjie]> SELECT * FROM students;

+-------+---------------+-----+--------+---------+-----------+

| StuID | Name          | Age | Gender | ClassID | TeacherID |

+-------+---------------+-----+--------+---------+-----------+

|     1 | Shi Zhongyu   |  22 | M      |       2 |         3 |

|     2 | Shi Potian    |  22 | M      |       1 |         7 |

|     3 | Xie Yanke     |  53 | M      |       2 |        16 |

|     4 | Ding Dian     |  32 | M      |       4 |         4 |

|     5 | Yu Yutong     |  26 | M      |       3 |         1 |

|     6 | Shi Qing      |  46 | M      |       5 |      NULL |

|     7 | Xi Ren        |  19 | F      |       3 |      NULL |

|     8 | Lin Daiyu     |  17 | F      |       7 |      NULL |

|     9 | Ren Yingying  |  20 | F      |       6 |      NULL |

|    10 | Yue Lingshan  |  19 | F      |       3 |      NULL |

|    11 | Yuan Chengzhi |  23 | M      |       6 |      NULL |

|    12 | Wen Qingqing  |  19 | F      |       1 |      NULL |

|    13 | Tian Boguang  |  33 | M      |       2 |      NULL |

|    14 | Lu Wushuang   |  17 | F      |       3 |      NULL |

|    18 | Hua Rong      |  23 | M      |       7 |      NULL |

|    19 | Xue Baochai   |  18 | F      |       6 |      NULL |

|    20 | Diao Chan     |  19 | F      |       7 |      NULL |

|    21 | Huang Yueying |  22 | F      |       6 |      NULL |

|    22 | Xiao Qiao     |  20 | F      |       1 |      NULL |

|    23 | Ma Chao       |  23 | M      |       4 |      NULL |

|    24 | Xu Xian       |  27 | M      |    NULL |      NULL |

|    25 | Sun Dasheng   | 100 | M      |    NULL |      NULL |

+-------+---------------+-----+--------+---------+-----------+

22 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> CALL deleteById(2,@Line);

Query OK, 1 row affected (0.01 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SELECT @Line;

+-------+

| @Line |

+-------+

|    21 |

+-------+

row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SELECT * FROM students;

+-------+-------------+-----+--------+---------+-----------+

| StuID | Name        | Age | Gender | ClassID | TeacherID |

+-------+-------------+-----+--------+---------+-----------+

|     1 | Shi Zhongyu |  22 | M      |       2 |         3 |

+-------+-------------+-----+--------+---------+-----------+

row in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> CALL deleteById(2,@Line);

5>.存储过程修改

　　ALTER语句修改存储过程只能修改存储过程的注释等无关紧要的东西,不能修改存储过程体,所以要修改存储过程,方法就是删除重建

6>.删除存储过程

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS;

+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| Db          | Name               | Type      | Definer        | Modified            | Created             | Security_type | Comment | character

_set_client | collation_connection | Database Collation |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| mysql       | AddGeometryColumn  | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || mysql       | DropGeometryColumn | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || yinzhengjie | deleteById         | PROCEDURE | root@localhost | 2019-10-28 21:23:31 | 2019-10-28 21:23:31 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | dorepeat           | PROCEDURE | root@localhost | 2019-10-28 21:32:01 | 2019-10-28 21:32:01 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | selectById         | PROCEDURE | root@localhost | 2019-10-28 21:21:37 | 2019-10-28 21:21:37 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | showTime           | PROCEDURE | root@localhost | 2019-10-28 20:49:09 | 2019-10-28 20:49:09 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+6 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> DROP PROCEDURE IF EXISTS deleteById;

Query OK, 0 rows affected (0.01 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> DROP PROCEDURE IF EXISTS selectById;

Query OK, 0 rows affected (0.01 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> SHOW PROCEDURE STATUS;

+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| Db          | Name               | Type      | Definer        | Modified            | Created             | Security_type | Comment | character

_set_client | collation_connection | Database Collation |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+| mysql       | AddGeometryColumn  | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || mysql       | DropGeometryColumn | PROCEDURE | root@localhost | 2019-10-26 22:17:15 | 2019-10-26 22:17:15 | DEFINER       |         | utf8

            | utf8_general_ci      | latin1_swedish_ci  || yinzhengjie | dorepeat           | PROCEDURE | root@localhost | 2019-10-28 21:32:01 | 2019-10-28 21:32:01 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    || yinzhengjie | showTime           | PROCEDURE | root@localhost | 2019-10-28 20:49:09 | 2019-10-28 20:49:09 | DEFINER       |         | utf8mb4

            | utf8mb4_general_ci   | utf8_general_ci    |+-------------+--------------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------

------------+----------------------+--------------------+4 rows in set (0.00 sec)

MariaDB [yinzhengjie]>

MariaDB [yinzhengjie]> DROP PROCEDURE IF EXISTS deleteById;

7>.流程控制

　　存储过程和函数中可以使用流程控制来控制语句的执行

　　流程控制：

　　　　IF：

　　　　　　用来进行条件判断。根据是否满足条件，执行不同语句

　　　　CASE：

　　　　　　用来进行条件判断，可实现比IF语句更复杂的条件判断

　　　　

　　　　LOOP：

　　　　　　重复执行特定的语句，实现一个简单的循环

　　　　LEAVE：

　　　　　　用于跳出循环控制

　　　　ITERATE：

　　　　　　跳出本次循环，然后直接进入下一次循环

　　　　REPEAT：

　　　　　　有条件控制的循环语句。当满足特定条件时，就会跳出循环语句

　　　　WHILE：

　　　　　　有条件控制的循环语句

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