What does HRESULT 0x80040E77 (DB_E_BADCONSTRAINTTYPE) mean?

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

ConstraintType is invalid or not supported by the provider.

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DB_E_BADCOMMANDID	DB_E_BADCONSTRAINTFORM

DB_E_BADCONSTRAINTTYPE

Exact value and result class

DB_E_BADCONSTRAINTTYPE has unsigned value 2147749495 (0x80040E77) and signed 32-bit value -2147217801. AllStat describes it as “ConstraintType is invalid or not supported by the provider”. In this result, a constraint descriptor names a constraint type that is invalid or unsupported by the provider.

The high bit is set, so this result is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3703 (0x0E77). These fields identify an interface-defined result family; they do not identify the provider instance, method, object generation or partial effects.

Contract boundary

OLE DB DDL interfaces identify indexes, commands and constraints with provider-scoped DBIDs. Constraint descriptors also carry type, column arrays, match behavior, deferrability and update/delete rules that must agree as one structure.

Investigation of this result should start with the session performing DDL, target table metadata and the exact DBID or DBCONSTRAINTDESC supplied. Capture it before ADO, ATL,.NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Diagnostic sequence

Capture raw 0x80040E77 and symbolic this result at the native call boundary.
Identify the exact failing stage for it: a constraint descriptor names a constraint type that is invalid or unsupported by the provider.
Retrieve all OLE DB error records for it before another COM call replaces thread error information.
Compare the live object state and provider-granted capabilities with the input that produced it.
Reduce the operation to the smallest case that preserves the same ddl contract.
Apply one evidence-backed correction for it and verify that the result is not merely replaced by a neighboring HRESULT.

Conditions that specifically lead to it

Cause 1 for it: the enumeration value is outside DBCONSTRAINTTYPE.
Cause 2 for it: the provider does not implement that constraint category.
Cause 3 for it: a descriptor was initialized for another OLE DB version.

Evidence to collect

A useful it event records provider CLSID and version, process architecture, interface IID and method, object correlation ID, transaction state and the immediately preceding HRESULT. When recording it data involving catalog names, schema names, object identifiers and deployment definitions, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.

Evidence 1 for it: ConstraintType value.
Evidence 2 for it: provider constraint capabilities.
Evidence 3 for it: the complete DBCONSTRAINTDESC without sensitive names.

Corrective actions

Action 1 for it: choose a documented supported constraint type.
Action 2 for it: feature-detect provider DDL support.
Action 3 for it: fall back to provider command text only when equivalent and controlled.

Retry and recovery

Retry rule for it: retry after selecting a valid constraint type supported by the provider. A it retry is safe only when the relevant input, object generation, capability or external state has changed. Before replaying a modifying call that returned it, determine whether rows, schema objects or URL resources were partially created or changed.

Do not turn it into an unbounded retry loop. Preserve cancellation for it and use a fresh provider object when the failed call may have left local state ambiguous.

Difference from nearby HRESULT values

DB_E_BADCONSTRAINTFORM means a recognized type has inconsistent fields, while it rejects the type itself. Telemetry and remediation for it should keep these outcomes distinct.

Practical scenario

A schema tool requests a CHECK constraint from a provider that supports only keys; capability filtering prevents it. Keeping it with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.

Developer and operations guidance

Code handling it should release COM objects in ownership order, retain per-row, per-column or per-property statuses, and log granted capabilities rather than only requested options. While handling it, opaque values such as HACCESSOR, HROW, HCHAPTER, DBID components and provider handles must remain scoped to the object that issued them.

Operational dashboards for it should group by provider version, interface, method and normalized failure stage. A it event must not expose passwords, tokens, full connection strings, unrestricted command text or raw row contents.

Official Microsoft references

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