What is SQL injection
User input is concatenated into SQL statements, changing the original meaning of SQL. Attackers can read, modify, and delete database data.
Common Types
Union injection: Jointly querying explosive data. Error injection: utilizing error information. Blind annotation: The page has no echo display and relies on authenticity to determine.
Defense methods
Parameterized query (precompiled); Input verification; Minimum privilege principle; WAF firewall.
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