Appendix:appendix
Constants for Database Engines Foundation
This section contains tables listing constants to set or get information about the configuration of Database Engines. They are defined in the files DMLB.CH and ???DBE.CH.
Universal constants for characteristics of database engines
| Constant | *) | Data type | Description |
|---|---|---|---|
| DBE_DATATYPES | ro | C | Supported data types |
| DBE_EXTENSION | a | C | Default file extension |
| DBE_MANUFACTURER | ro | C | Producer of the DBE |
| DBE_NAME | ro | C | Name of the DBE |
| DBE_VERSION | ro | C | Version of the DBE |
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Universal constants for database objects (work areas)
| Constant | *) | Data type | Description |
|---|---|---|---|
| DBO_ALIAS | ro | C | Alias name |
| DBO_FILENAME | ro | C | Name of the open file |
| DBO_ORDERS | ro | N | Number of orders (indexes) |
| DBO_RELATIONS | ro | N | Number of relations |
| DBO_SHARED | ro | L | .T. if the data is accessed |
| in SHARED mode | |||
| DBO_REMOTE | ro | L | .T. if the data is stored |
| on a remote drive | |||
| DBO_SERVER | ro | L | .T. if the data is managed |
| by a server | |||
| DBO_DBENAME | ro | L | Name of the DatabaseEngine |
| managing this workarea | |||
|
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Universal constants for field variables in a work area
| Constant | *) | Data type | Description |
|---|---|---|---|
| FLD_LEN | ro | N | Length of field |
| FLD_DEC | ro | N | Number of decimal places |
| FLD_TYPE | ro | N | Data type of field variable on |
| the Xbase++ language level | |||
| FLD_NATIVETYPE | ro | N | Original data type of field |
| variable as defined in the DBE | |||
|
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Constants for data types (FieldInfo( FLD_TYPE ) return values)
| Constant | Description | |
|---|---|---|
| XPP_CHARACTER | Character value | |
| XPP_DATE | Date value | |
| XPP_LOGICAL | Logical value | |
| XPP_MEMO | Memo field | |
| XPP_NUMERIC | Numeric value | |
| XPP_ARRAY | Array | *) |
| XPP_BLOCK | Code block | *) |
| XPP_DOUBLE | Numeric value as double | *) |
| XPP_ILLEGAL | Invalid data type | *) |
| XPP_OBJECT | Object | *) |
| XPP_UNDEF | Undefined value (NIL) | *) |
|
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