Fundamentals of InfoSecintermediate
Explain how a prepared statement prevents an input value from changing the meaning of an SQL command.
Answer
The application prepares and sends the SQL structure separately from its parameter values. The database parses the command structure, then treats bound values as data. As a result, input that resembles SQL syntax is not interpreted as part of the command.
Explanation
### What a good answer covers
- The command structure is prepared separately from the input values.
- Parameter values are bound to designated placeholders.
- The database interprets those values as data rather than SQL instructions.
- This prevents the input from changing the command's structure in the way SQL injection requires.
### The concept
Unsafe string construction can blur the boundary between a program's command and user-supplied content. A prepared statement maintains that boundary. Validation remains useful for format, length, and type, but filtering particular words alone is not the central protection.
### Terms
- **SQL**: Structured Query Language, used to communicate database commands.
- **Prepared statement**: A database command prepared separately from its parameter values.
- **Placeholder**: A position in a prepared command where a value will be bound.
### Remember
The security benefit comes from separating SQL structure from user data.
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