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Add Neo4j docu for important commands

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Wolfgang Huß 2022-07-19 15:15:33 +02:00
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neo4j/README.md
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@ -7,7 +7,7 @@ database available. The community edition of Neo4J is Free and Open Source and
we try our best to keep our application compatible with the community edition
only.
## Installation with Docker
## Installation With Docker
Run:
@ -19,7 +19,7 @@ You can access Neo4J through [http://localhost:7474/](http://localhost:7474/)
for an interactive cypher shell and a visualization of the graph.
## Installation without Docker
## Installation Without Docker
Install the community edition of [Neo4j](https://neo4j.com/) along with the plugin
[Apoc](https://github.com/neo4j-contrib/neo4j-apoc-procedures) on your system.
@ -51,3 +51,42 @@ in `backend/.env`.
Start Neo4J and confirm the database is running at [http://localhost:7474](http://localhost:7474).
## Commands
Here we describe some rarely used Cypher commands for Neo4j that are needed from time to time:
### Index And Contraint Commands
The indexes and constraints of our database are set in `backend/src/db/migrate/store.js`.
This is where the magic happens.
If they are missing or not set correctly, the browser search will not work or the database seed for development will not work.
#### Show Indexes And Contraints
```bash
# in browser command line or cypher shell
# show all indexes and contraints
$ :schema
# show all indexes
$ CALL db.indexes();
# show all contraints
$ CALL db.constraints();
```
#### Add And Drop Indexes And Contraints
```bash
# in browser command line or cypher shell
# create indexes
$ CALL db.index.fulltext.createNodeIndex("post_fulltext_search",["Post"],["title", "content"]);
$ CALL db.index.fulltext.createNodeIndex("user_fulltext_search",["User"],["name", "slug"]);
$ CALL db.index.fulltext.createNodeIndex("tag_fulltext_search",["Tag"],["id"]);
# drop all indexes and contraints
$ CALL apoc.schema.assert({},{},true) YIELD label, key RETURN * ;
```