mirror of
https://github.com/lana-k/sqliteviz.git
synced 2025-12-06 18:18:53 +08:00
3a6628cab9
* Proof-of-concept pre-built custom sql.js * Rewrite Makefile as a couple of comprehensible Python scripts * Add link to a blog post about transitive closure in SQLite * Remove eval extension -- no much point as it only returns a string * Consistently use existing Path objects * Add basic tests scalar functions from extension-functions.c * Test presence of functions from the rest of built extensions * Use the same sqlite.com domain * Add a couple SQLite compile flags that may make it a bit faster * Add regexpi function test * Add node about regexpi and REGEXP operator * Workaround first build failure, rebuild lock file and minor fixes
74 lines
2.7 KiB
Markdown
74 lines
2.7 KiB
Markdown
# SQLite WebAssembly build
|
|
|
|
This directory contains Docker-based build script, `make.sh`, that builds
|
|
a custom version of [sql.js][1]. It allows sqliteviz to have more recent
|
|
version of SQLite build with a number of useful extensions.
|
|
|
|
`Makefile` from [sql.js][1] is rewritten as more comprehensible `configure.py`
|
|
and `build.py` Python scripts that run in `emscripten/emsdk` Docker container.
|
|
|
|
## Extension
|
|
|
|
SQLite [amalgamation][2] extensions included:
|
|
|
|
1. [FTS5][4] -- virtual table module that provides full-text search
|
|
functionality
|
|
|
|
SQLite [miscellaneous extensions][3] included:
|
|
|
|
1. `generate_series` table-valued [series function][6] ([series.c][7])
|
|
2. `transitive_closure` virtual table for
|
|
[Querying Tree Structures in SQLite][11] ([closure.c][8])
|
|
3. `uuid`, `uuid_str` and `uuid_blob` RFC-4122 UUID functions ([uuid.c][9])
|
|
4. `regexp` (hence `REGEXP` operator) and `regexpi` functions ([regexp.c][10])
|
|
|
|
SQLite 3rd party extensions included:
|
|
|
|
1. [pivot_vtab][5] -- a pivot virtual table
|
|
|
|
To ease the step to have working clone locally, the build is committed into
|
|
the repository.
|
|
|
|
## Build method
|
|
|
|
Basically it's extended amalgamation and `SQLITE_EXTRA_INIT` concisely
|
|
described in [this message from SQLite Forum][12]:
|
|
|
|
> Simply append it to the end of the amalgamation file. The real problem is
|
|
> how you get the init function called. The easiest way (to me at any rate) is
|
|
> to append a function (after the extensions you want to add are all appended)
|
|
> that adds the init function for each extension to the auto extension list
|
|
> for new connections, and set the pre-processor symbol SQLITE_EXTRA_INIT to
|
|
> the name of this function. [...]
|
|
>
|
|
> An example `SQLITE_EXTRA_INIT` function looks like this:
|
|
>
|
|
> ```
|
|
> int core_init(const char* dummy)
|
|
> {
|
|
> int nErr = 0;
|
|
>
|
|
> nErr += sqlite3_auto_extension((void*)sqlite3_autobusy_init);
|
|
> nErr += sqlite3_auto_extension((void*)sqlite3_ipaddress_init);
|
|
>
|
|
> return nErr ? SQLITE_ERROR : SQLITE_OK;
|
|
> }
|
|
> ```
|
|
>
|
|
> so you would then define `SQLITE_EXTRA_INIT=core_init` when compiling the
|
|
> amalgamation code and the extensions would thereafter be automatically
|
|
> initialized on each connection.
|
|
|
|
[1]: https://github.com/sql-js/sql.js
|
|
[2]: https://sqlite.org/amalgamation.html
|
|
[3]: https://sqlite.org/src/dir?ci=trunk&name=ext/misc
|
|
[4]: https://sqlite.org/fts5.html
|
|
[5]: https://github.com/jakethaw/pivot_vtab
|
|
[6]: https://sqlite.org/series.html
|
|
[7]: https://sqlite.org/src/file/ext/misc/series.c
|
|
[8]: https://sqlite.org/src/file/ext/misc/closure.c
|
|
[9]: https://sqlite.org/src/file/ext/misc/uuid.c
|
|
[10]: https://sqlite.org/src/file/ext/misc/regexp.c
|
|
[11]: https://charlesleifer.com/blog/querying-tree-structures-in-sqlite-using-python-and-the-transitive-closure-extension/
|
|
[12]: https://sqlite.org/forum/forumpost/6ad7d4f4bebe5e06?raw
|