Re: [sqlite] Help with json1 query?

[Wout Mertens]

Can you elaborate on the metadata? Are the keys always the same, in which
case you could store them as columns?

There's also the https://sqlite.org/rtree.html extension which lets you
efficiently query multidimensional range data.

If there is truly no schema, what you propose is the only way AFAIK.

On Wed, Feb 28, 2018, 10:52 PM Charles Leifer,  wrote:

> Hi,
>
> I'm prototyping a little graph library using SQLite. My idea is to store
> vertices in a simple table like this:
>
> CREATE TABLE "vertex" ("key" TEXT NOT NULL PRIMARY KEY, "metadata" JSON);
> CREATE TABLE "edge" (
> "id" INTEGER NOT NULL PRIMARY KEY,
> "src" TEXT NOT NULL,
> "dest" TEXT NOT NULL,
> "metadata" JSON,
> FOREIGN KEY ("src") REFERENCES "vertex" ("key"),
> FOREIGN KEY ("dest") REFERENCES "vertex" ("key"));
>
> What I'd like to do is allow querying of edges (or vertices) using a
> *partial* metadata object. So if I had the following JSON object stored in
> an edge's metadata:
>
> {"k1": "v1", "k2": "v2", "k3": "v3"}
>
> The user could provide me an object like {"k1": "v1", "k3": "v3"} and I
> would be able to match the above edge's metadata.
>
> I can see decomposing the user-provided dictionary and building up multiple
> equality tests using the json_extract() function, e.g.:
>
> select * from edge where json_extract(metadata, '$.k1') = 'v1' AND
> json_extract(metadata, '$.k3') = 'v3';
>
> But I was hoping there would be a more elegant way to express this that
> someone would be able to share? It seems as though I should be able to use
> `json_each()` (or even `json_tree()` if metadata could be nested?), but I'm
> not sure how to formulate the query.
>
> It'd be great if there were a JSON function like "json_contains()" where I
> could write:
>
> select * from edge where json_contains(metadata, '$', '{"k1": "v1", "k3":
> "v3"}');
>
> Any help appreciated!
>
> Charlie
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[sqlite] Bug in fsdir

[Jake Thaw]

The following query causes a crash in fsdirNext on Windows 10.

SQLite version 3.22.0 2018-01-22 18:45:57
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> SELECT name FROM fsdir('.') JOIN (VALUES(1),(2));
.
./sqlite3.exe
./sqlite3_analyzer.exe
./sqldiff.exe
.

Adding an ORDER BY clause seems to provide workaround for this particular
case.

Regards

Jake
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