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fix: updates in docs on UPDATE
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dc 2024-09-03 21:07:44 +02:00
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docs/dcc-tables.md
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@ -37,8 +37,8 @@ This is a required field.
The loadtype determines the nature of the update to be applied. Valid values are as follows:
- UPDATE. This is the most basic type - simply provide the primary key fields in the `BUSKEY` column.
- FORMAT_CAT. For updating Format Catalogs, the BUSKEY should be `FMTNAME START`. See [formats](/formats).
- UPDATE. This is the most basic type, and any updates will happen 'in place'. Simply provide the primary key fields in the `BUSKEY` column.
- TXTEMPORAL. This signifies an SCD2 type load. For this type the validity fields (valid from, valid to) should be specified in the `VAR_TXFROM` and `VAR_TXTO` fields. The table itself should include `VAR_TXFROM` in the physical key. The remainder of the primary key fields (not including `VAR_TXFROM`) should be specified in `BUSKEY`.
- BITEMPORAL. These tables have two time dimensions - a version history, and a business history. The version history (SCD2) fields should be specified in `VAR_TXFROM` and `VAR_TXTO` and the business history fields should be specified in `VAR_BUSFROM` and `VAR_BUSTO`. Both the `VAR_TXFROM` and `VAR_BUSFROM` fields should be in the physical key of the actual table, but should NOT be specified in the `BUSKEY` field.
- REPLACE. This loadtype simply deletes all the rows and appends the staged data. Changes are NOT added to the audit table. In the diff screen, previous rows are displayed as deleted, and staged rows as new (modified values are not displayed). Can be useful for updating single-row tables.
@ -48,6 +48,9 @@ This is a required field.
!!! Note
The support for BITEMPORAL loads is restricted, in the sense it is only possible to load data at a single point in time (no support for loading _multiple_ business date ranges for a _specific_ BUSKEY). The workaround is simply to load each date range separately. As a result of this restriction, the EDIT page will only show the latest business date range for each key. To modify earlier values, a filter should be applied.
!!! Warning
If your target table contains referential constraints (eg primary key values that are linked to a master table) then this will cause problems with the UPDATE and REPLACE load types. This is due to the fact these both involve delete operations. If removal of these constraints is not an option, the workaround would be to create a separate (mirror) table, and update that using PRE-EDIT and POST-APPROVE hook scripts. Please contact Data Controller support for advice / assistance.
### BUSKEY
The business (natural) key of the table. For SCD2 / Bitemporal, this does NOT include the validity dates. For Retained / Surrogate key tables, this contains the actual surrogate key - the underlying fields that are used to create the surrogate key are specified in [RK_UNDERLYING](#rk_underlying).