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DB_E_BADCOMPAREOP
Meaning
Windows documents DB_E_BADCOMPAREOP as “Comparison operator is invalid”. Here, a rowset find or view-filter operation receives a comparison operator that is invalid for the selected contract.
Evidence to collect before changing the system
- Evidence 1: the comparison operator for each criteria column.
- Evidence 2: the accessor bindings and criteria row layout.
- Evidence 3: provider support for string, ordering and ignore comparisons.
Relevant OLE DB contract
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.
Specific conditions that produce it
- Cause 1: the DBCOMPAREOP value is outside the enumeration.
- Cause 2: the operator is not supported for the bound column type.
- Cause 3: an array of comparison operators is misaligned with the criteria bindings.
Corrective actions
- Action 1: validate operator values before SetFilter or FindNextRow.
- Action 2: choose operators compatible with each bound type.
- Action 3: 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.
Retry and recovery policy
Retry rule: retry after replacing the invalid operator or criteria mapping.
Difference from related HRESULT values
DB_E_BADVALUES is a general invalid-value result, while DB_E_BADCOMPAREOP specifically identifies the comparison operator in a find or filter contract.
Official Microsoft references
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