Update notes for 2018-09-24

content/posts/2018-09.md

@@ -434,5 +434,30 @@ sqlite> INSERT INTO items(id, views) VALUES(0, 7) ON CONFLICT(id) DO UPDATE SET
 - But when I deployed it on my Ubuntu 16.04 environment I realized Ubuntu's SQLite is old and doesn't support `UPSERT`, so my indexing doesn't work...
 - Apparently `UPSERT` came in SQLite 3.24.0 (2018-06-04), and Ubuntu 16.04 has 3.11.0
 - Ok this is hilarious, I manually downloaded the [libsqlite3 3.24.0 deb from Ubuntu 18.10 "cosmic"](https://packages.ubuntu.com/cosmic/libsqlite3-0) and installed it in Ubnutu 16.04 and now the Python `indexer.py` works
+- This is definitely a dirty hack, but the list of packages we use that depend on `libsqlite3-0` in Ubuntu 16.04 are actually pretty few:
+
+```
+# apt-cache rdepends --installed libsqlite3-0 | sort | uniq
+  gnupg2
+  libkrb5-26-heimdal
+  libnss3
+  libpython2.7-stdlib
+  libpython3.5-stdlib
+```
+
+- I wonder if I could work around this by detecting the SQLite library version, for example on Ubuntu 16.04 after I replaced the library:
+
+```
+# python3
+Python 3.5.2 (default, Nov 23 2017, 16:37:01) 
+[GCC 5.4.0 20160609] on linux
+Type "help", "copyright", "credits" or "license" for more information.
+>>> import sqlite3
+>>> print(sqlite3.sqlite_version)
+3.24.0
+```
+
+- Or maybe I should just bite the bullet and migrate this to PostgreSQL, as it [supports `UPSERT` since version 9.5](https://wiki.postgresql.org/wiki/UPSERT) and also seems to have my new favorite `LIMIT` and `OFFSET`
+- I changed the syntax of the SQLite stuff and PostgreSQL is working flawlessly with psycopg2... hmmm.
 
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