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Protect a database from SQL injection by keeping user-supplied values out of SQL text: use prepared statements or your language’s parameterized-query API, and bind every value. Then handle query structure with fixed allow-lists, review stored procedures for unsafe dynamic SQL, and restrict the database account to the permissions the application actually needs. No single one of these controls replaces the others.
How SQL injection happens
SQL injection commonly occurs when an application builds a query by concatenating untrusted input into SQL text. The input can then change the query’s structure or meaning instead of being treated only as data. OWASP classifies injection as A05:2025 in the OWASP Top 10:2025.
Use parameterized queries for data values
Define the SQL statement separately from the values supplied by a user. A prepared statement or parameterized-query API sends each value as a parameter rather than inserting it into the SQL text. OWASP’s SQL Injection Prevention Cheat Sheet describes this as a primary defense and provides examples for Java and .NET, with pointers to examples in other languages.
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For example, a query should have a placeholder for a customer name, with the name bound separately through the database library. Do not build the SQL by joining a name, search term, or other untrusted value into a string. Bind every data value that can come from a user or another untrusted source.
#1 Best Overall
OWASP explains: “Prepared statements are simple to write and easier to understand than dynamic queries, and parameterized queries force the developer to define all SQL code first and pass in each parameter to the query later.” See its Query Parameterization Cheat Sheet for related guidance.
Handle table names, columns, and sort direction separately
Parameters generally bind values, not SQL identifiers or syntax. A placeholder cannot usually stand in for a table name, column name, or keyword such as ASC or DESC. If a user choice changes the query structure, do not concatenate that choice directly into SQL.
Rank #2
- Prefer a fixed query or redesign the feature so the choice is represented as a bound value.
- When the structure must vary, map each permitted user choice to a code-defined identifier or SQL fragment. For example, map a requested sort option to one of two fixed directions, or a report-field choice to a known column.
- Reject choices outside the allow-list. Validation helps ensure the application accepts only expected values, but it does not make arbitrary concatenated SQL safe.
Validate values for the feature’s expected type, format, range, or enumerated choices. Do not rely on banning punctuation such as apostrophes to secure a query: free-form text may legitimately contain punctuation and Unicode. OWASP’s Input Validation Cheat Sheet treats validation as a separate control, not a replacement for safe query construction.
Use stored procedures safely
Stored procedures can prevent SQL injection when implemented safely, just as parameterized statements can. The important question is whether user values remain parameterized throughout query execution. A procedure that assembles and executes dynamic SQL from untrusted input can recreate the same vulnerability. Review procedure bodies for dynamic SQL construction and execution; parameterizing the application’s call to a procedure does not fix unsafe SQL assembled inside it. OWASP covers these caveats in its SQL Injection Prevention Cheat Sheet and Injection Prevention Cheat Sheet.
Choose between prepared statements and stored procedures based on the application’s language, database, and data-access design. In either approach, check for internal dynamic SQL and ensure the application’s database permissions fit its functions.
Limit what the application’s database account can do
Give each application database identity only the access its functions require. A feature that only reads data should not need write or administrator privileges. Where it fits the design, grant access through specific views or procedures, or limit access to the necessary tables. OWASP’s Database Security Cheat Sheet and Secure Database Access guidance discuss restricting database access.
Least privilege limits what an attacker may be able to do if an application is compromised; it does not stop injection. Keep parameterized queries as the core prevention control, and use distinct database accounts where appropriate to separate application functions.
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Escaping input is database- and context-specific, so it is easy to apply incorrectly and difficult to guarantee across every query. OWASP strongly discourages escaping all user-supplied input as the primary SQL injection defense. Prefer parameterized values and fixed, allow-listed query structure instead.
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Review SQL access during code review
- Search for SQL built with string concatenation, interpolation, or other dynamic assembly.
- Trace user-controlled values to query execution and confirm they are passed as bound parameters rather than inserted into SQL text.
- Check any variable table, column, or sort choice against a fixed allow-list.
- Inspect stored procedures and other database-side code for unsafe dynamic SQL.
- Verify that each database account has only the permissions its application functions need.
- Check that database errors do not disclose sensitive implementation details. OWASP’s Secure Code Review Cheat Sheet offers broader review guidance.
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