Fields in the HISTVAL table
The following table contains the fields of the HISTVAL table that can be accessed in a query using SQL.
| Name | OLE DB type |
| DPSYSTEM | DBTYPE_I1 |
| DPID | DBTYPE_UI4 |
| DPEL | DBTYPE_I2 |
| DPTYPEID | DBTYPE_I2 |
| DPTYPE | DBTYPE_BSTR |
| DPNAME | DBTYPE_BSTR |
| STIME | DBTYPE_BSTR *) |
| DESCRIPTION | DBTYPE_BSTR |
| ALIAS | DBTYPE_BSTR |
| FORMAT | DBTYPE_BSTR |
| UNIT | DBTYPE_BSTR |
| ORIGINALVALUE | VARIANT **) |
| ONLINEVALUE | VARIANT |
| OFFLINEVALUE | VARIANT |
| DEFAULTVALUE | VARIANT |
| CORRECTIONVALUE | VARIANT |
| STATUSBITS | DBTYPE_UI4 ***) |
| ACTIVE_BIT | DBTYPE_BOOL |
| EXP_DEFAULT_BIT | DBTYPE_BOOL |
| AUTDEFAULT_BIT | DBTYPE_BOOL |
| DEFAULT_BIT | DBTYPE_BOOL |
| OUT_PRANGE_BIT | DBTYPE_BOOL |
| OUT_RANGE_BIT | DBTYPE_BOOL |
| EXP_INV_BIT | DBTYPE_BOOL |
| AUT_INV_BIT | DBTYPE_BOOL |
| INVALID_BIT | DBTYPE_BOOL |
| BAD_BIT | DBTYPE_BOOL |
| DEFAULT_BAD_BIT | DBTYPE_BOOL |
| ONLINE_BAD_BIT | DBTYPE_BOOL |
| OFFLINE_BAD_BIT | DBTYPE_BOOL |
| FROM_GI_BIT | DBTYPE_BOOL |
| FROM_SI_BIT | DBTYPE_BOOL |
| PER_ACTIVE_BIT | DBTYPE_BOOL |
| CORR_BIT | DBTYPE_BOOL |
| COMPR_BIT | DBTYPE_BOOL |
| COMP_CORR_BIT | DBTYPE_BOOL |
| CORR_ADD_BIT | DBTYPE_BOOL |
| COMP_INV_BIT | DBTYPE_BOOL |
| STIME_INV_BIT | DBTYPE_BOOL |
| USERBIT1_BIT | DBTYPE_BOOL |
| USERBIT2_BIT | DBTYPE_BOOL |
| USERBIT3_BIT | DBTYPE_BOOL |
| USERBIT4_BIT | DBTYPE_BOOL |
| USERBIT5_BIT | DBTYPE_BOOL |
| USERBIT6_BIT | DBTYPE_BOOL |
| USERBIT7_BIT | DBTYPE_BOOL |
| USERBIT8_BIT | DBTYPE_BOOL |
| USER | DBTYPE_UI2 |
| MANAGER | DBTYPE_UI2 |
| EVENTTYPE | DBTYPE_UI2 |
| ARCHIVENUMBER | DBTYPE_UI2 |
*): In order to not to forfeit the millisecond accuracy, all WinCC OA TimeVar types are converted to DBTYPE_BSTR in the defined default time format and also passed to the querying application in this format.
**): The Variant data type in OLE DB can take any data type from WinCC OA (for example, float, int, bool, string and others). The page Data types for OLE DB provider contains information on the conversion of WinCC OA data types into OLE DB data types.
***): Since the querying application would display an unsigned integer as a number, the status bits are converted into a BSTR and also passed in this format. This contains a bit string of 32 characters (each 0 or 1).
Since the Variant type is limited to an accuracy of seconds for time data, time information held in original value, online value and others is automatically converted into text in the standardized time format and subsequently always processed and displayed as text.
Status bits are also converted into a text representing the bit pattern.
