Data types for OLE DB provider
Conversion
When working with a consumer that supports OLE DB, the WinCC OA data types are converted into the listed types as follows:
| WinCC OA data type | OLE DB data types |
| struct | - |
| bit32 | DBTYPE_UI4 |
| bool | DBTYPE_BOOL |
| char | DBTYPE_UI1 |
| float | DBTYPE_R8 |
| int | DBTYPE_I4 |
| unsigned | DBTYPE_I4 |
| string | DBTYPE_BSTR |
| langstring | DBTYPE_BSTR (CONV.) |
| time | DBTYPE_DATE |
| typeref | - |
| dpid | DBTYPE_BSTR |
| blob | - |
| dyn_bool | ARRAY |DBTYPE_BOOL |
| dyn_int | ARRAY |DBTYPE_I4 |
| dyn_uint | ARRAY |DBTYPE_UI4 |
| dyn_float | ARRAY |DBTYPE_R8 |
| dyn_string | ARRAY |DBTYPE_BSTR |
| dyn_langString | ARRAY |DBTYPE_BSTR (CONV:) |
| dyn_bit32 | ARRAY |DBTYPE_UI4 |
| dyn_char | ARRAY |DBTYPE_UI1 |
| dyn_time | ARRAY |DBTYPE_DATE |
| dyn_dpid | ARRAY |DBTYPE_BSTR |
| dyn_blob | - |
| bool array | ARRAY |DBTYPE_BOOL |
| int array | ARRAY|DBTYPE_I4 |
| uint array | ARRAY|DBTYPE_UI4 |
| float array | ARRAY|DBTYPE_R8 |
| string array | ARRAY|DBTYPE_BSTR |
| langString array | ARRAY|DBTYPE_BSTR |
| bit32 array | ARRAY|DBTYPE_UI4 |
| char array | ARRAY|DBTYPE_UI1 |
| time array | ARRAY|DBTYPE_DATE |
| dpid array | ARRAY|DBTYPE_BSTR |
| blob array | - |
The integer data types (except I2) do not work under Excel 97, that is, a runtime error is output for an OLE DB access using VBA. This is an Excel 97 specific problem.
Conversion of data types
If working with VB programs, the following conversion matrix applies when importing data into variables of a specific type:
| From/To | bit32 | bool | char | float | int | unsigned | string | langString | time |
| bit32 | x | - | - | - | x | x | x | - | - |
| bool | - | x | x | x | x | x | x | - | - |
| char | - | - | x | x | x | x | x | - | - |
| float | - | x | - | x | x | x | x | - | - |
| int | x | x | - | x | x | x | x | - | x |
| unsigned | x | x | - | x | x | x | x | - | x |
| string | - | x | x | x | - | - | x | - | - |
| langString | - | - | - | - | - | - | x | x | - |
| time | - | - | - | - | x | x | x | - | x |
