In this super-optimised tech world, writing a same block of code too many times is a mundane task and a bad practice. That’s where code reusability needs to be shown up.
In Front end JS frameworks, we create common components and inject them in the other component(s) wherever needed. Developing a reusable Header is the best example of such a common component.
Likewise, from backend developer’s perspective, when it comes to API development, we can choose to go with a mechanism which would provoke code reusability principle. In this case, Stored Procedure is the way out !
To begin with, stored procedure is nothing but the prepared sql statement(query) that can be saved and reused over and over again by executing them.
🌈 Stored procedures are the easiest when it comes to Syntax
CREATE PROCEDURE procedure_name
It gets executed as,
Can we use it with Parameters ? 🤔
Yes, Stored procedures can be written using either a single parameter or multiple parameters. Example given below specify their usage.
⚡️ Procedure with One Parameter
The stored procedure to select Students from a particular City from the “Students” table is given below:
CREATE PROCEDURE SelectAllStudents @City varchar(30)
SELECT * FROM Students WHERE City = @City
Below is how to execute above stored procedure,
EXEC SelectAllStudents @City = ‘London’;
⚡️ Stored Procedure with Multiple Parameters
Setting up multiple parameters is no rocket science. It’s as easy as to make a list of each parameter and the data type separated by a comma.
The following stored procedure selects Students from a particular City with a particular PostalCode from the “Students” table:
CREATE PROCEDURE SelectAllStudents @City varchar(30),@PostalCode varchar(10)
SELECT * FROM Students WHERE City = @City AND PostalCode = @PostalCode
Executing it is simple as given below,
EXEC SelectAllStudents @City = ‘London’, @PostalCode = ‘WA1 1DP’;
Using Stored procedure makes life of a backend developer easier as it plays a crucial role in avoiding code redundancy which also leads to better memory enhancement.
Happy executing 😎