SQL Parameterizer
指导
SQL Parameterizer
SQL Parameterizer turns a query full of hardcoded values into a safe, reusable prepared statement. Paste SQL with inline string and numeric literals and instantly get back a parameterized query plus the extracted values as a JSON array — ready to bind in your application code.
如何使用
Paste your SQL into the input box, then choose a placeholder style that matches your database driver: PostgreSQL ($1, $2), MySQL or SQLite (?), or Oracle/named (:p1, :p2). Optionally toggle whether string and numeric literals are parameterized. The parameterized SQL and the ordered values array update automatically — copy or download either one.
特征
- Multiple placeholder styles – PostgreSQL $1/$2, MySQL/SQLite ?, and Oracle/named :p1/:p2.
- Deterministic tokenizer – Identifies real literals while leaving column names, keywords, and quoted identifiers untouched.
- Smart quote handling – Correctly decodes doubled (”) and backslash-escaped quotes inside strings.
- Extracted values array – Outputs an ordered JSON array of bound values, ready to drop into prepared statements.
- Comment-aware – Skips line and block comments so values inside them are never altered.
- Private and client-side – Everything runs in your browser; no query ever leaves your machine.
常问问题
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What is a parameterized query?
A parameterized query separates the SQL command text from the data values. Instead of embedding literals directly in the statement, you use placeholders and pass the values separately to the database driver, which binds them safely at execution time.
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How do parameterized queries prevent SQL injection?
Because bound values are never parsed as SQL, a value containing quotes or SQL keywords is treated as literal data rather than executable code. This removes the attack surface where attacker-controlled strings could change the meaning of a query.
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Why do placeholder styles differ between databases?
Each database driver defines its own bind syntax. PostgreSQL uses ordinal placeholders like $1 and $2, MySQL and SQLite use positional question marks, and Oracle uses named placeholders such as :p1. The underlying concept of binding values is the same across all of them.
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Do bind parameters affect query performance?
Yes. Reusing a single parameterized statement lets the database cache and reuse its execution plan across many different values, avoiding the overhead of re-parsing and re-planning a fresh literal-laden query every time.
