I think the addition of a JSON extension to SQLite is very exciting for both the project and for its users.
JSON TO SQLITE PYTHON FREE
Please feel free to leave a comment here, or if you have specific questions about the extension, you might wish to refer to the sqlite-users mailing list. This is just a sampling of the functionality in the JSON1 extension, and I'm looking forward to experimenting with it more over the coming weeks. "value" = 'sqlite' )) ORDER BY json_extract ( "t1". "data", '$' ) AS parent WHERE ( ( "tree". "data", '$.title' ) AS title FROM "entry" AS t1, json_tree ( "t1". Since each tree node contains a reference to it's parent, we can simply search for a parent node named "tags" that contains a child node with the value "sqlite".
JSON TO SQLITE PYTHON CODE
What's going on in the above code is we are selecting the Entry itself, along with two trees representing the entry's child nodes. alias ( 'parent' ) > tree_ref = Entity ( 'tree' ) > parent_ref = Entity ( 'parent' ) > query = ( Entry. Other than that, it's pretty straightforward: So I opted to do a little hand-hacking of pysqlite to automatically register the JSON extension when the module is initialized - that is the gnarly sed command. Looking at the source, there are conditional compilation flags in the SQLite openDatabase function that automatically initialize popular extensions like FTS and RTREE.
It turns out this isn't hard, but in order for the JSON extension to be usable, it needs to be initialized when a connection is open.
The final step (and for me, the trickiest) is to build pysqlite against the new static library. If not, cruise the console output and hopefully the error is easy to spot. There should now be a file named lib/libsqlite3.a in the SQLite3 source checkout. configure -prefix=$JQLITE -enable-static -disable-shared make sqlite3.c cat ext/misc/json1.c > sqlite3.c make lib_install I put mine in ~/bin/jqlite for fun, but you can change the path to whatever you like.Įxport CFLAGS="-fPIC -DSQLITE_ENABLE_FTS3=1 \ -DSQLITE_ENABLE_COLUMN_METADATA=1 \ -DSQLITE_ENABLE_UNLOCK_NOTIFY \ -DSQLITE_SECURE_DELETE \ -DSQLITE_ENABLE_LOAD_EXTENSION=1". To get started, we need a nice clean home for the new libraries. There were a couple steps involved, so I'll try and break it down into sub-steps. SQLite also requires tcl and awk to create the source amalgamation, so before starting in, you'll need to install: We'll be grabbing the latest SQLite source code - to do this you can use fossil, the source-code management system used by SQLite, or alternatively you can pull down a compressed image. I've done this now on arch and ubuntu, but I'm not sure about fapple or windoze. In this post, we'll build SQLite with the new JSON extension, then build pysqlite against the json-ready SQLite.
Hipp posted to the sqlite-users mailing list requesting feedback for a draft of the json1 module APIs, so I thought the Python community might be able to help out.
JSON TO SQLITE PYTHON HOW TO
The post includes instructions for compiling pysqlite and apsw, as well as example code showing how to use these new extensions in your Python projects.Ī couple weeks ago, word started getting around trendy programming circles about a new file that had appeared in the SQLite fossil repo named json1.c. I've written a new version of this post with updated instructions for compiling SQLite with JSON1 and FTS5. With the release of SQLite 3.9.0, the instructions for compiling SQLite and building pysqlite have been greatly simplified.
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