SQL DatabaseLesson 63Free preview

SQL Injection

This lesson is part of SQL · All levels

Summary

SQL injection is an attack when an attacker inserts a piece of SQL through a user input so that the query intent changes and can leak or even delete data. A classic example is the input 'OR' 1'=1 which makes the condition always true. Prevention includes using parameterized queries or prepared statements, applying the principle of minimum rights, and validating inputs.

Key points

SQL injection occurs when user input is incorporated raw into a string query.
The effect can be bypass logins, read, change, or delete data.
The main prevention: prepared statement with binding parameters.
The principle of least privilege: give the application account the minimum access.
Validation input is an additional layer, not a substitute for a parameterized query.

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