80 lines
2.6 KiB
Markdown
80 lines
2.6 KiB
Markdown
---
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id: 1b71b163-b56f-4226-9731-a76ef245e532
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type: fix
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title: "Fix: sqlx in-memory SQLite pool requires max_connections=1"
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tags: [sba-scouting, rust, sqlx, sqlite, testing, fix, in-memory]
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importance: 0.8
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confidence: 0.8
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created: "2026-03-02T02:08:46.895029+00:00"
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updated: "2026-03-02T02:20:58.504326+00:00"
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---
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# sqlx In-Memory SQLite Pool: max_connections Must Be 1
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## Problem
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Integration tests using `:memory:` SQLite failed with "no such table" errors after wrapping `create_tables` in a transaction.
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## Root Cause
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With `max_connections > 1`, each connection in the pool gets its own separate in-memory database. A transaction on connection A (e.g. `pool.begin()` for `create_tables`) is invisible to queries on connection B. In-memory SQLite databases are per-connection — there is no shared state across connections.
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## Fix
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Detect `:memory:` path and force `max_connections(1)`. Also skip WAL journal mode for in-memory DBs (WAL requires a file).
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```rust
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let pool = if db_path == ":memory:" {
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SqlitePoolOptions::new()
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.max_connections(1)
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.connect(":memory:")
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.await?
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} else {
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SqlitePoolOptions::new()
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.max_connections(5)
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.connect(&format!("sqlite:{db_path}"))
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.await?
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};
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// Only set WAL for file-backed DBs
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if db_path != ":memory:" {
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sqlx::query("PRAGMA journal_mode=WAL").execute(&pool).await?;
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}
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```
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## Impact
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All 5 integration tests were broken until this was applied. Applies to any test setup using `create_tables` inside a transaction with a shared pool.
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