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DB_E_OBJECTMISMATCH
Meaning
Windows documents DB_E_OBJECTMISMATCH as “rguidColumnType points to a GUID that does not match the object type of this column, or this column was not set”. In this case, an object-valued column request supplies a GUID that does not match the column object type, or addresses a column whose object value was not set.
Relevant contract
Investigation of this result should start with the binder or session, normalized URL, requested GUID/object type and DBBINDURLSTATUS result.
Conditions that specifically lead to the result
- Cause 1: rguidColumnType names the wrong object class.
- Cause 2: the column contains no object to open.
- Cause 3: metadata for the object-valued column is stale.
Evidence to collect
A useful diagnostic event records provider CLSID and version, process architecture, interface IID and method, object correlation ID, transaction state and the immediately preceding HRESULT. When recording diagnostic data involving URLs containing credentials, tenant paths and remote object names, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.
- Evidence 1: column DBID and requested object GUID.
- Evidence 2: current column type metadata.
- Evidence 3: status indicating whether the column value is set.
Diagnostic sequence
- Identify the exact failing stage: an object-valued column request supplies a GUID that does not match the column object type, or addresses a column whose object value was not set.
Corrective actions
- Action 1: request the object type advertised by current metadata.
- Action 2: handle unset object columns as absent.
- Action 3: refresh metadata after schema or provider changes.
Retry and recovery
Retry rule: retry after choosing the matching object type and confirming that the column is populated.
Practical scenario
A consumer asks IRow::Open for a stream GUID on a row-valued column; using the advertised type prevents it.
Difference from nearby HRESULT values
DB_E_RESOURCENOTSUPPORTED means the provider cannot supply the requested resource type generally, while DB_E_OBJECTMISMATCH means it does not match this column.
Official Microsoft references
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