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Give clearer example of multiple query predicates in one ql file

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The new names aren't great, so feel free to change them, but I think we do need an explicit example of updating two relations using one ql file.
This commit is contained in:
Owen Mansel-Chan
2024-08-21 14:18:11 +01:00
committed by GitHub
parent 15989ce213
commit 113ab755d9
1 changed files with 6 additions and 4 deletions
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docs/prepare-db-upgrade.md
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@@ -59,14 +59,16 @@ extended.rel: reorder input.rel (int id, string name, int parent) id name parent
// QLL library, and will run in the context of the *old* dbscheme.
relationname.rel: run relationname.qlo
// Create relationname.rel by running the query predicate 'predicatename' in
// relationname.qlo and writing the query results as a .rel file. This command
// Create relation1.rel by running the query predicate 'predicate1' in upgrade.qlo
// and writing the query results as a .rel file, and running 'predicate2' in
// upgrade.qlo and writing the query results as a .rel file. This command
// expects the upgrade relation to be a query predicate, which has the advantage
// of allowing multiple upgrade relations to appear in the same .ql file as
// multiple query predicates. The query file should be named relationname.ql and
// multiple query predicates. The query file should be named upgrade.ql and
// should be placed in the upgrade directory. It should avoid using the default
// QLL library, and will run in the context of the *old* dbscheme.
relationname.rel: run relationname.qlo predicatename
relation1.rel: run upgrade.qlo predicate1
relation2.rel: run upgrade.qlo predicate2
```
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