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DB_E_BADTYPE
Meaning
Windows documents DB_E_BADTYPE as “Type is invalid”. Here, an OLE DB structure or binding contains an invalid DBTYPE indicator.
Relevant OLE DB contract
This result must be interpreted against this contract: OLE DB separates conversion capability from conversion of a particular value; IConvertType reports supported type routes, while bindings additionally carry length, precision, scale, status and storage semantics.
Start with the provider object performing the conversion and the exact source and destination type description when investigating this result.
Evidence to collect before changing the system
When it involves unconverted values, binary payloads, locale-specific text and parameter data, record types, lengths, hashes or redacted identifiers instead of secrets or full business data.
- Evidence 1: the raw type indicator and modifier bits.
- Evidence 2: the binding, column or parameter ordinal using it.
- Evidence 3: provider metadata from which the type should have been derived.
Specific conditions that produce it
- Cause 1: the type value is outside the DBTYPE enumeration.
- Cause 2: modifier bits are combined illegally.
- Cause 3: a provider-specific native type code is placed where an OLE DB DBTYPE is required.
Retry and recovery policy
Retry rule: retry after supplying a valid DBTYPE and compatible binding.
Corrective actions
- Action 1: use DBTYPE values from OLE DB metadata.
- Action 2: validate modifier combinations such as BYREF, ARRAY and VECTOR.
- Action 3: keep native provider type names separate from DBTYPE indicators.
Practical incident
A schema adapter places a database engine type number directly into DBBINDING.wType; translating it to the matching DBTYPE removes it.
Difference from related HRESULT values
DB_E_BADTYPENAME rejects a textual native type name, while DB_E_BADTYPE rejects the numeric OLE DB type indicator.
Official Microsoft references
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