Conn Prepared Statements

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title: Use Prepared Statements Correctly with Pooling impact: HIGH impactDescription: Avoid prepared statement conflicts in pooled environments tags: prepared-statements, connection-pooling, transaction-mode

Use Prepared Statements Correctly with Pooling

Prepared statements are tied to individual database connections. In transaction-mode pooling, connections are shared, causing conflicts.

Incorrect (named prepared statements with transaction pooling):

-- Named prepared statement
prepare get_user as select * from users where id = $1;

-- In transaction mode pooling, next request may get different connection
execute get_user(123);
-- ERROR: prepared statement "get_user" does not exist

Correct (use unnamed statements or session mode):

-- Option 1: Use unnamed prepared statements (most ORMs do this automatically)
-- The query is prepared and executed in a single protocol message

-- Option 2: Deallocate after use in transaction mode
prepare get_user as select * from users where id = $1;
execute get_user(123);
deallocate get_user;

-- Option 3: Use session mode pooling (port 5432 vs 6543)
-- Connection is held for entire session, prepared statements persist

Check your driver settings:

-- Many drivers use prepared statements by default
-- Node.js pg: { prepare: false } to disable
-- JDBC: prepareThreshold=0 to disable

Reference: Prepared Statements with Pooling