Security First: Best Practices to Prevent SQL Injection in MyBatis

With the continuous development of network technology, database attacks are becoming more and more common. SQL injection is one of the common attack methods. Attackers enter malicious SQL statements into the input box to perform illegal operations, causing data leakage, tampering or even deletion. In order to prevent SQL injection attacks, developers must pay special attention when writing code, and when using an ORM framework such as MyBatis, they need to follow some best practices to ensure the security of the system.

1. Parameterized query

Parameterized query is the first line of defense against SQL injection attacks. When using MyBatis for database operations, we should always use parameterized queries instead of splicing SQL statements. Through parameterized queries, SQL statements and parameters can be separated, avoiding the direct splicing of user-entered data into SQL statements, effectively preventing SQL injection attacks from occurring.

The following is a sample code that demonstrates how to use MyBatis for parameterized queries:

// 使用 #{} 替代直接拼接参数
@Select("SELECT * FROM users WHERE username = #{username}")
User getUserByUsername(@Param("username") String username);

2. Input verification

In addition to using parameterized queries, you also need Strictly verify user input to ensure that the entered data meets expectations. After receiving user input data, you can perform some simple verifications, such as determining the length of the input data, whether it contains special characters, etc., to reduce the risk of SQL injection.

// 输入校验示例
public boolean isValidInput(String input) {
    // 校验输入是否包含特殊字符
    if (input.matches(".*[;\-\'\"].*")) {
        return false;
    }
    return true;
}

3. Use MyBatis dynamic SQL

Mybatis provides a powerful dynamic SQL function that can dynamically splice SQL statements based on conditions, thereby reducing the possibility of manually splicing SQL statements. Using dynamic SQL not only makes the code more flexible, but also reduces the probability of errors and improves the security of the system.

// 动态 SQL 示例
public List<User> getUsersWithCondition(String username, String email) {
    return sqlSession.selectList("getUserWithCondition", new HashMap<String, String>() {{
        put("username", username);
        put("email", email);
    }});
}

4. Security audit log

During the operation of the system, recording security audit logs is a very important measure. By recording users' operating behaviors and input data, abnormal behaviors can be discovered in time and the source of attacks can be traced. If a SQL injection attack occurs, you can use the audit log to locate the problem and fix it in time.

// 安全审计日志记录示例
public void logSecurityAudit(String operation, String username, String input) {
    String log = String.format("Operation: %s | Username: %s | Input: %s", operation, username, input);
    logger.info(log);
}

Through the above best practices, we can effectively prevent SQL injection attacks and ensure system security. During the development process, security is always the primary consideration. We should always pay attention to the security of the system and take appropriate measures to reduce potential security risks. MyBatis provides a wealth of functions to help us build safe and reliable applications. We should make good use of these resources to ensure the security of user data.

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