Go Up to Working with Metadata (FireDAC)
To enable this feature, you must set the connection definition parameter ExtendedMetadata to True. The table below lists the DBMSs:
| DBMS
|
Description
|
| IBM DB2
|
- Origin table and column name for each item in select list;
- Columns updatability;
- Columns auto-incrementing mode.
|
| Firebird, InterBase
|
- Columns with domain %BOOL% are recognized as ftBoolean;
- Columns with domain %GUID% are recognized as ftGUID;
- When the table has a BEFORE INSERT trigger, which depends on a single sequence and a single table column, this column is recognized as ftAutoInc;
- Columns GENERATED BY DEFAULT AS IDENTITY are recognized as ftAutoInc;
- Columns COMPUTED BY are recognized as TField.AutoGenerateValue = arDefault.
|
| PostgreSQL
|
- Origin table and column name for each item in select list;
- Columns optionality;
- Columns updatability;
- Columns with domain LO, LARGEOBJECT or BLOB are recognized as ftOraBlob (BLOB handled by the reference);
- Columns with DEFAULT NEXTVAL('xxx') are recognized as ftAutoInc;
- Columns with other default values are recognized as [caDefault];
- Columns with system OID are recognized as [caROWID].
|
| SQL Server
|
- Origin table and column name for each item in select list.
|
| Teradata Database
|
- Origin table and column name for each item in select list.
- Columns auto-incrementing mode.
- Column default values.
|
Extended metadata recognition is supported only for the dataset columns and not for the mkTableFields metadata request.
Note: ExtendedMetadata=True executes additional queries. That may decrease application performance.
See Also