cr_params_not_bound
Easy Fix
MySQL · Connector / Client Library
MySQL client error 2031: PARAMS NOT BOUND.
Quick Answer
Error code CR_PARAMS_NOT_BOUND on your MySQL Connector / Client Library means: MySQL client error 2031: PARAMS NOT BOUND.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Capture client and server logs for CR_PARAMS_NOT_BOUND, including host, port, TLS mode, and statement context.
2
Validate request schema, field types, and identifiers against current server rules.
3
Reproduce with a minimal payload to isolate which attribute is rejected.
4
Add client-side guards and contract tests so this validation pattern is blocked pre-deploy.
5
Track CR_PARAMS_NOT_BOUND frequency by environment to detect regressions early.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
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