SQLx (Rust)
Async, pure Rust SQL library with compile-time SQL query verification. Unlike ORMs, SQLx lets you write raw SQL queries validated at compile time against a live database (or saved schema). Supports PostgreSQL, MySQL, and SQLite with async execution via Tokio or async-std. The query!() macro catches SQL syntax errors and type mismatches at compile time.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Parameterized queries prevent SQL injection by default. TLS support for all database connections. Credentials via environment variables. Pure Rust — no OpenSSL dependency issues.
⚡ Reliability
Best When
You want to write raw SQL in Rust with compile-time correctness guarantees and async execution — maximum SQL control with Rust type safety.
Avoid When
You want ORM-style abstractions, code-first schema, or don't want to manage SQL strings — use Diesel or SeaORM.
Use Cases
- • Write type-safe SQL queries in Rust with compile-time verification that query syntax and return types are correct
- • Build async database access layers in Rust services using Tokio without the abstraction cost of an ORM
- • Run complex SQL queries that ORMs can't express efficiently while keeping Rust's type safety via query! macros
- • Create connection pools with sqlx::Pool for high-throughput agent backends requiring concurrent database access
- • Implement database migration management with sqlx migrate command integrated into Rust binary
Not For
- • Teams wanting ORM abstractions (models, relations, migrations as code) — use Diesel or SeaORM for full ORM features
- • Compile-time query checking without a database connection — SQLx requires a live DB or offline mode setup during development
- • Non-async contexts — SQLx is async-first; blocking usage requires runtime wrappers
Interface
Authentication
Authentication via database connection string (DATABASE_URL env var). Supports all auth methods the underlying database driver supports.
Pricing
Apache 2.0 and MIT dual license. Community maintained.
Agent Metadata
Known Gotchas
- ⚠ Compile-time query checking requires DATABASE_URL set during cargo build — CI/CD pipelines need database access or must use sqlx prepare to save offline metadata
- ⚠ query! macro returns anonymous struct types — query_as! macro required to map results to named structs, which requires matching field names exactly
- ⚠ Null handling requires Option<T> in query results — non-nullable columns in schema but nullable in query return None unless explicitly handled
- ⚠ SQLx connection pool (Pool<Postgres>) is not Send+Sync by default in some configurations — ensure pool is shared correctly in async contexts
- ⚠ PostgreSQL parameter binding uses $1, $2 syntax while MySQL uses ? — queries are not portable between databases without rewriting
- ⚠ Offline mode (sqlx prepare) generates .sqlx/ query metadata files that must be committed to version control for CI builds without live database access
Alternatives
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Scores are editorial opinions as of 2026-03-07.