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DB_E_BADCOMPAREOP
Exact value and interpretation
DB_E_BADCOMPAREOP has the unsigned 32-bit value 2147749415 (0x80040E27) and the signed representation -2147217881. AllStat defines the result as “Comparison operator is invalid”. In the concrete failure represented here, a rowset find or view-filter operation receives a comparison operator that is invalid for the selected contract.
The high bit is set for it, so it is a failure HRESULT rather than a success or informational status. Its facility field is 4 (FACILITY_ITF) and its low code is 3623 (0x0E27). Those bit fields place this result in an interface-defined family, but they do not reveal the provider, object identity, method, rowset generation or command state that produced it.
Evidence to collect before changing the system
A useful this result record includes provider CLSID and version, process architecture, interface and method, COM apartment and thread, object correlation ID, transaction state, and the first preceding HRESULT. When it involves filter values, row keys, bookmarks and selection criteria, record types, lengths, hashes or redacted identifiers instead of secrets or full business data.
- Evidence 1 for it: the comparison operator for each criteria column.
- Evidence 2 for it: the accessor bindings and criteria row layout.
- Evidence 3 for it: provider support for string, ordering and ignore comparisons.
OLE DB contract boundary
This result must be interpreted against this contract: OLE DB views and find operations derive row ranges from an accessor, comparison operators, current ordering and region state; handles and containment relationships become stale when the view, filter or rowset generation changes.
Start with the active rowset view, its criteria accessor and the region or row sequence supplied by the consumer when investigating this result. Preserve it before ADO, ATL,.NET, a database abstraction layer or an application exception replaces it with a generic message; the exact interface and method matter because one OLE DB object can expose several contracts with different preconditions.
Specific conditions that produce it
- Cause 1 for it: the DBCOMPAREOP value is outside the enumeration.
- Cause 2 for it: the operator is not supported for the bound column type.
- Cause 3 for it: an array of comparison operators is misaligned with the criteria bindings.
Diagnostic sequence
- Capture it immediately at the native OLE DB return and obtain the current OLE DB error object before another COM call replaces thread error information.
- Identify the exact stage for it: a rowset find or view-filter operation receives a comparison operator that is invalid for the selected contract.
- compare the live command, rowset, accessor or schema state with the metadata and properties actually granted by the provider.
- inspect per-binding, per-property, per-row or per-record statuses whenever the method supplies them; the aggregate result may not identify the rejected element.
- reproduce the issue with the smallest command, rowset or definition operation that preserves the same contract boundary.
- apply one evidence-backed correction, then verify that the operation succeeds and does not merely change into a nearby HRESULT.
Corrective actions
- Action 1 for it: validate operator values before SetFilter or FindNextRow.
- Action 2 for it: choose operators compatible with each bound type.
- Action 3 for it: keep criteria and operator arrays generated from the same schema model.
Practical incident
A filter builder uses a bitmask value where a single DBCOMPAREOP is required; emitting the correct equality operator prevents it. The diagnostic value comes from retaining it together with the failing interface and object state, not from reducing every provider result to “database error”.
Implementation guidance
Code handling it should release OLE DB resources in ownership order, preserve every provider error record, and log granted properties rather than only requested properties. When handling it, handles such as HACCESSOR, HROW, HCHAPTER and provider-specific region tokens must never be treated as portable integers across object lifetimes.
When it crosses an abstraction boundary, attach a stable correlation ID and structured fields for the native HRESULT, provider source, interface IID, method, object generation and operation phase. Do not log passwords, access tokens, complete SQL text or unrestricted row values merely to make the event easier to search.
Retry and recovery policy
Retry rule for it: retry after replacing the invalid operator or criteria mapping. A safe it retry must use a changed input, object generation, provider capability or state transition. If the call returning it could have created, updated, deleted or copied data, determine partial completion before replaying it.
Use bounded retries and preserve cancellation. Configuration and contract failures should normally fail fast; concurrency, resource or transient state failures may justify retry only after their stated precondition changes.
Difference from related HRESULT values
DB_E_BADVALUES is a general invalid-value result, while it specifically identifies the comparison operator in a find or filter contract. Keep these outcomes separate in telemetry and user-facing remediation because it requires a different next action.
Official Microsoft references
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