How Does Go's 'database/sql' Library Prevent SQL Injection Attacks?

Preventing SQL Injection Attacks with "database/sql" in Go

When building web applications, securing input is crucial to prevent malicious attacks. SQL injection is a common threat that allows attackers to execute arbitrary SQL queries, potentially compromising data and application integrity. In Go, the "database/sql" library provides built-in protection against SQL injection.

To ensure complete protection, it is essential to always use the Prepare or Query functions when constructing SQL queries. These functions securely handle input parameters, preventing potentially malicious content from being injected into the query.

For example, the following code is vulnerable to SQL injection:

db.Query("SELECT name FROM users WHERE age=" + req.FormValue("age"))

It concatenates the user input ("age") into the query string, which could allow an attacker to inject malicious code by providing a manipulated input value.

In contrast, using Prepare or Query prevents this vulnerability:

db.Query("SELECT name FROM users WHERE age=?", req.FormValue("age"))

In this case, the input parameter ("age") is securely placed as a placeholder in the query, and the library handles the binding process to prevent any malicious code from being executed.

By adhering to this practice, you can effectively prevent SQL injection attacks in your Go web applications while using the "database/sql" library.

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