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Prepared statements are a database concept for precompiling parameterized SQL queries. They separate code from data, reduce parsing overhead for repeated queries and mitigate SQL injection attacks. Widely supported by relational databases, they are commonly used in server-side access layers, ORMs and middleware and are straightforward to implement.
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Prepared statements are pre-parsed SQL commands whose structure is sent to a database separately from variable values.
They emerged to optimise repeated database queries and became part of database drivers and SQL interfaces. Separating command structure from parameters is also a core defence against SQL injection.
Prepare a query once with placeholders and bind typed values for each execution. The database then treats values as data rather than new SQL code. Dynamic table or column names still require a safe allowlist.
Associates a value with a placeholder without changing SQL structure.
The database's internal strategy for executing a query.
An attack in which uncontrolled input changes the meaning of a SQL query.
Prepared statements improve security and often performance for repeated queries. They must be used consistently; string concatenation, unsafe identifiers, and excessive privileges remain risks.
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