search
HomeDatabaseMysql TutorialMySQL 存储过程学习

MySQL 存储过程学习

Jun 07, 2016 pm 03:10 PM
mysql stored proceduredatabase

MySQL 5.0终于开始已经支持存储过程,这样即可以大大提高数据库的处理速度,同时也可以提高数据库编程的灵活性。

MySQL 5.0终于开始已经支持存储过程,这样即可以大大提高数据库的处理速度,同时也可以提高数据库编程的灵活性。

存储过程的优点:

①重复使用。存储过程可以重复使用,从而可以减少数据库开发人员的工作量。

②提高性能。存储过程在创建的时候在进行了编译,将来使用的时候不再重新翻译。一般的SQL语句每执行一次就需要编译一次,所以使用存储过程提高了效率。

③减少网络流量。存储过程位于服务器上,调用的时候只需要传递存储过程的名称以及参数就可以了,,因此降低了网络传输的数据量。

④安全性。参数化的存储过程可以防止SQL注入式攻击,而且可以将Grant、Deny以及Revoke权限应用于存储过程。

创建简单的事例表有id,和name两个字段,并插入5条数据如下:

mysql> create table t1(id int not null primary key,name varchar(20) default null);

mysql> insert into t1 values(1,'name1'),(2,'name2'),(3,'name3'),(4,'name4'),(5,'name5');

mysql> select * from t1;

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

| id | name  |

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

|  1 | name1 |

|  2 | name2 |

|  3 | name3 |

|  4 | name4 |

|  5 | name5 |

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

5 rows in set (0.00 sec)

MySQL存储过程的参数用在存储过程的定义,共有三种参数类型,IN,OUT,INOUT:

IN 输入参数:表示该参数的值必须在调用存储过程时指定,在存储过程中修改该参数的值不能被返回,为默认值;
OUT 输出参数:该值可在存储过程内部被改变,并可返回;
INOUT 输入输出参数:调用时指定,并且可被改变和返回。

IN参数例子:

mysql> delimiter //

mysql> create procedure p_in(IN p_id int) 

    -> begin

    -> delete from t1 where id = p_id;                                         

    -> end

    -> //

Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> call p_in(5);

Query OK, 1 row affected (0.03 sec)

mysql> select * from t1;

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

| id | name  |

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

|  1 | name1 |

|  2 | name2 |

|  3 | name3 |

|  4 | name4 |

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

4 rows in set (0.00 sec)


OUT参数例子:

mysql> delimiter //

mysql> create procedure p_out(OUT p_out int)

    -> begin

    -> select count(id) from t1 into p_out;

    -> end

    -> //

Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> call p_out(@p_out_result);

Query OK, 1 row affected (0.00 sec)

mysql> select @p_out_result;

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

| @p_out_result |

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

|      4 |

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

1 row in set (0.00 sec)


同时存在IN,OUT参数:

mysql> delimiter //

mysql> create procedure p_in_out(IN p_in int,OUT p_out int)

    -> begin

    -> delete from t1 where id =p_in;

    -> select count(id) from t1 into p_out;             

    -> end

    -> //

Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> select @p_in_out_result;

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

| @p_in_out_result |

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

|        3 |

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

1 row in set (0.00 sec)

mysql> select * from t1;

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

| id | name  |

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

|  1 | name1 |

|  2 | name2 |

|  3 | name3 |

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

3 rows in set (0.00 sec)


INOUT参数:

mysql> select * from t1;

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

| id | name  |

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

|  1 | name1 |

|  2 | name2 |

|  3 | name3 |

|  4 | name4 |

|  5 | name5 |

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

5 rows in set (0.00 sec)

mysql> delimiter //

mysql> create procedure p_inout(INOUT p_inout int)

    ->begin

    ->select p_inout;

    ->set p_inout=4;

    ->select p_inout;

    -> delete from t1 where id =p_inout;

    ->end

    ->//

Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> set @p_input=5;

mysql> call p_inout(@p_input);

+---------+

| p_inout |

+---------+

|    5 |

+---------+

1 row in set (0.00 sec)

+---------+

| p_inout |

+---------+

|    4 |

+---------+

1 row in set (0.00 sec)

本文永久更新链接地址

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How do you handle database upgrades in MySQL?How do you handle database upgrades in MySQL?Apr 30, 2025 am 12:28 AM

The steps for upgrading MySQL database include: 1. Backup the database, 2. Stop the current MySQL service, 3. Install the new version of MySQL, 4. Start the new version of MySQL service, 5. Recover the database. Compatibility issues are required during the upgrade process, and advanced tools such as PerconaToolkit can be used for testing and optimization.

What are the different backup strategies you can use for MySQL?What are the different backup strategies you can use for MySQL?Apr 30, 2025 am 12:28 AM

MySQL backup policies include logical backup, physical backup, incremental backup, replication-based backup, and cloud backup. 1. Logical backup uses mysqldump to export database structure and data, which is suitable for small databases and version migrations. 2. Physical backups are fast and comprehensive by copying data files, but require database consistency. 3. Incremental backup uses binary logging to record changes, which is suitable for large databases. 4. Replication-based backup reduces the impact on the production system by backing up from the server. 5. Cloud backups such as AmazonRDS provide automation solutions, but costs and control need to be considered. When selecting a policy, database size, downtime tolerance, recovery time, and recovery point goals should be considered.

What is MySQL clustering?What is MySQL clustering?Apr 30, 2025 am 12:28 AM

MySQLclusteringenhancesdatabaserobustnessandscalabilitybydistributingdataacrossmultiplenodes.ItusestheNDBenginefordatareplicationandfaulttolerance,ensuringhighavailability.Setupinvolvesconfiguringmanagement,data,andSQLnodes,withcarefulmonitoringandpe

How do you optimize database schema design for performance in MySQL?How do you optimize database schema design for performance in MySQL?Apr 30, 2025 am 12:27 AM

Optimizing database schema design in MySQL can improve performance through the following steps: 1. Index optimization: Create indexes on common query columns, balancing the overhead of query and inserting updates. 2. Table structure optimization: Reduce data redundancy through normalization or anti-normalization and improve access efficiency. 3. Data type selection: Use appropriate data types, such as INT instead of VARCHAR, to reduce storage space. 4. Partitioning and sub-table: For large data volumes, use partitioning and sub-table to disperse data to improve query and maintenance efficiency.

How can you optimize MySQL performance?How can you optimize MySQL performance?Apr 30, 2025 am 12:26 AM

TooptimizeMySQLperformance,followthesesteps:1)Implementproperindexingtospeedupqueries,2)UseEXPLAINtoanalyzeandoptimizequeryperformance,3)Adjustserverconfigurationsettingslikeinnodb_buffer_pool_sizeandmax_connections,4)Usepartitioningforlargetablestoi

How to use MySQL functions for data processing and calculationHow to use MySQL functions for data processing and calculationApr 29, 2025 pm 04:21 PM

MySQL functions can be used for data processing and calculation. 1. Basic usage includes string processing, date calculation and mathematical operations. 2. Advanced usage involves combining multiple functions to implement complex operations. 3. Performance optimization requires avoiding the use of functions in the WHERE clause and using GROUPBY and temporary tables.

An efficient way to batch insert data in MySQLAn efficient way to batch insert data in MySQLApr 29, 2025 pm 04:18 PM

Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.

Steps to add and delete fields to MySQL tablesSteps to add and delete fields to MySQL tablesApr 29, 2025 pm 04:15 PM

In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software