Stored Procedures¶
A stored procedure is a set of pre-defined SQL statements stored in the database and executed as a single unit. It allows users to execute complex operations without rewriting the same code multiple times.
Benefit | Description |
---|---|
Code Reusability | Stored procedures can be reused multiple times in different parts of an application, reducing code duplication. |
Improved Performance | By executing multiple SQL statements in a single call, stored procedures can reduce network traffic and improve performance. |
Enhanced Security | Users can execute stored procedures without needing direct access to underlying tables, improving security and data integrity. |
Centralized Logic | Business logic is encapsulated within stored procedures, making it easier to manage and maintain. |
Disadvantage | Description |
---|---|
Difficulty in Debugging | Stored procedures can be challenging to debug, as they are executed on the database server rather than within the application code. |
Vendor Lock-in | Stored procedures are specific to a particular database system, making it difficult to migrate to another database platform. |
Limited Portability | Stored procedures written in one database system may not be compatible with other systems, limiting portability and interoperability. |
Stored Procedure examples¶
Create a Stored Procedure¶
mysql> DELIMITER //
mysql> CREATE PROCEDURE GetCustomerDetails (IN customerId INT)
-> BEGIN
-> SELECT * FROM customers WHERE id = customerId;
-> END //
mysql> DELIMITER ;
Call a Stored Procedure¶
mysql> CALL GetCustomerDetails(123);
Modify a Stored Procedure¶
mysql> DELIMITER //
mysql> ALTER PROCEDURE GetCustomerDetails (IN customerId INT)
-> BEGIN
-> SELECT name, email FROM customers WHERE id = customerId;
-> END //
mysql> DELIMITER ;
Drop a Stored Procedure¶
mysql> DROP PROCEDURE IF EXISTS GetCustomerDetails;
Advanced SQL features¶
- Data Types Basic
- Functions
- SQL Conventions
- SQL Errors
- SQL Syntax
- Stored Procedure Error Handling
- Stored Procedure Variables
- Triggers
- Troubleshooting SQL
Get expert help¶
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Last update:
2024-08-28