Скачать или смотреть How to Pass a Parameter in SQL Statement in Spring Boot

Learn how to effectively pass parameters into SQL statements in Spring Boot to ensure safe and dynamic database operations.
---
This video is based on the question https://stackoverflow.com/q/74522789/ asked by the user 'Tony' ( https://stackoverflow.com/u/20538516/ ) and on the answer https://stackoverflow.com/a/74522900/ provided by the user 'Alien' ( https://stackoverflow.com/u/6572971/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to pass a parameter in SQL statement in Springboot

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Pass a Parameter in SQL Statement in Spring Boot

In Spring Boot, managing SQL queries effectively is crucial for creating secure and dynamic applications. A common task developers encounter is passing parameters into SQL statements while performing database operations like deletes. Today, we will tackle a common issue: how to correctly pass an int id as a parameter in an SQL statement to delete specific user interests from a user_interests table.

The Problem

You have a situation where you need to delete rows from the user_interests table based on a specific user ID. Initially, you attempted to use a parameterized query like this:

[[See Video to Reveal this Text or Code Snippet]]

However, when you run this code in Postman, it doesn't work. You’ve observed that using a static value, such as user_id = 1, works perfectly fine. The challenge remains: how can you pass the user ID parameter correctly into your SQL statement?

The Solution

The good news is that passing parameters in SQL statements in Spring Boot can be straightforward, but it’s important to do so safely to prevent SQL injection attacks. Let's break down the solution into manageable steps.

Basic Method

The simplest way to construct your SQL statement is by concatenating the user ID directly into the SQL string. Here’s how you can do this:

[[See Video to Reveal this Text or Code Snippet]]

While this method will work and delete the intended records, it comes with a serious risk of SQL injection if the id parameter is sourced from an untrusted input.

Using Prepared Statements

To enhance security, it's recommended to use prepared statements. Prepared statements help separate SQL logic from the input data, mitigating SQL injection risks. Here is how you can use prepared statements in your code:

Define the SQL statement with placeholders: Use ? as a placeholder for the parameters you want to pass.

[[See Video to Reveal this Text or Code Snippet]]

Prepare a statement: Create a prepared statement and set the parameters.

[[See Video to Reveal this Text or Code Snippet]]

Summary

Using prepared statements is a best practice when handling dynamic SQL queries. Not only does it provide a layer of security, but it also enhances the performance of your application.

Basic Concatenation: Simple but risky regarding SQL injections.

Prepared Statements: The safest and most efficient choice.

Conclusion

In this guide, we explored how to effectively pass a parameter in an SQL statement in Spring Boot. Always prioritize security by opting for prepared statements, especially when handling user-generated input. By following these practices, you can ensure that your data operations are safe, efficient, and reliable.

Now that you know how to pass parameters securely in Spring Boot, you can build robust applications with confidence!