How to prevent sql injection in mybatis

Mybatis method to prevent sql injection: 1. Use precompiled SQL statements; 2. Use #{} placeholder; 3. Use {} placeholder; 4. Use dynamic SQL; 5. Input Verify and clean; 6. Restrict database permissions; 7. Use Web Application Firewall; 8. Keep MyBatis and database security updated. Detailed introduction: 1. Use precompiled SQL statements. MyBatis uses precompiled SQL statements to perform query and update operations. Precompiled SQL statements use parameterized queries, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

MyBatis is an excellent persistence layer framework that supports customized SQL, stored procedures and advanced mapping. To prevent SQL injection, MyBatis provides multiple mechanisms to ensure the security of user input. The following are the main methods for MyBatis to prevent SQL injection:

1. Use precompiled SQL statements: MyBatis performs query and update operations through precompiled SQL statements. Precompiled SQL statements use parameterized queries, which means user input is passed as parameters rather than directly spliced ​​into the SQL statement. This effectively prevents SQL injection attacks because the attacker's input will not be executed as SQL code.

2. Use #{} placeholders: In the XML mapping file of MyBatis, you can use #{} placeholders to reference parameters. This approach treats the parameter value as a JDBC parameter rather than part of the SQL statement. MyBatis will automatically escape parameter values ​​to ensure their safety.

3. Use {} placeholder: Different from `#{}` placeholder, `{} placeholder will directly replace the parameter value into the SQL statement. This can lead to the risk of SQL injection and should be used with caution. Use the ${}` placeholder only if you completely trust the value passed in and are sure it is safe.

4. Use dynamic SQL: MyBatis supports dynamic SQL and can dynamically generate SQL statements based on conditions. However, be particularly careful when using dynamic SQL to ensure that user input is not spliced ​​into the SQL statement to prevent SQL injection. It is best to use dynamic elements such as if, choose, when, otherwise, etc. to control the generation of SQL.

5. Input validation and cleaning: Before passing user input to the database, the input should be validated and cleaned. Make sure the input is in the expected format and remove or escape any potentially malicious characters. This can be achieved through Java's validation framework (such as Apache Commons Validator) or custom validation logic.

6. Restrict database permissions: In order to prevent SQL injection attacks, the permissions of accounts connected to the database should be restricted. Even if attackers are able to inject malicious code, they cannot perform unrestricted operations. Grants only permission to connect, query, and execute limited commands rather than granting administrator-level permissions.

7. Use Web Application Firewall: Web Application Firewall can detect and block common Web application attacks, including SQL injection. The WAF can be configured to monitor requests and block any suspicious input patterns. While a WAF is not a replacement for other security measures, it can serve as an additional layer of defense to reduce the risk of potential attacks.

8. Keep MyBatis and database security updated: It is very important to update MyBatis and database management system security patches in a timely manner. Developers should pay attention to official security bulletins and apply relevant fixes and patches as soon as possible to ensure the security of the system.

To sum up, MyBatis uses multiple mechanisms to prevent SQL injection attacks, including precompiled SQL statements, parameterized queries, input validation and sanitization, and restricted database permissions. At the same time, developers should also pay attention to security best practices and take other additional defensive measures to improve system security.

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