Allows downloading/loading a complete StackExchange project (#9)

Using the '-s' switch, download the compressed file from _https://ia800107.us.archive.org/27/items/stackexchange/_, then, uncompress it and load all the files in the database. 

Add a '-n' switch to move the tables to a given schema.

Author: madtibo

README.md

@@ -7,7 +7,8 @@ Schema hints are taken from [a post on Meta.StackExchange](http://meta.stackexch
 ## Dependencies
 
  - [`lxml`](http://lxml.de/installation.html)
- - [`psychopg2`](http://initd.org/psycopg/docs/install.html)
+ - [`psycopg2`](http://initd.org/psycopg/docs/install.html)
+ - [`libarchive-c`](https://pypi.org/project/libarchive-c/)
 
 ## Usage
 
@@ -18,14 +19,14 @@ Schema hints are taken from [a post on Meta.StackExchange](http://meta.stackexch
    `Badges.xml`, `Votes.xml`, `Posts.xml`, `Users.xml`, `Tags.xml`.
    - In some old dumps, the cases in the filenames are different.
  - Execute in the current folder (in parallel, if desired):
-   - `python load_into_pg.py Badges`
-   - `python load_into_pg.py Posts`
-   - `python load_into_pg.py Tags` (not present in earliest dumps)
-   - `python load_into_pg.py Users`
-   - `python load_into_pg.py Votes`
-   - `python load_into_pg.py PostLinks`
-   - `python load_into_pg.py PostHistory`
-   - `python load_into_pg.py Comments`
+   - `python load_into_pg.py -t Badges`
+   - `python load_into_pg.py -t Posts`
+   - `python load_into_pg.py -t Tags` (not present in earliest dumps)
+   - `python load_into_pg.py -t Users`
+   - `python load_into_pg.py -t Votes`
+   - `python load_into_pg.py -t PostLinks`
+   - `python load_into_pg.py -t PostHistory`
+   - `python load_into_pg.py -t Comments`
  - Finally, after all the initial tables have been created:
    - `psql stackoverflow < ./sql/final_post.sql`
    - If you used a different database name, make sure to use that instead of
@@ -34,7 +35,25 @@ Schema hints are taken from [a post on Meta.StackExchange](http://meta.stackexch
    - `psql stackoverflow < ./sql/optional_post.sql`
    - Again, remember to user the correct database name here, if not `stackoverflow`.
 
-## Caveats
+## Loading a complete stackexchange project
+
+You can use the script to download a given stackexchange compressed file from
+[archive.org](https://ia800107.us.archive.org/27/items/stackexchange/) and load
+all the tables at once, using the `-s` switch.
+
+You will need the `urllib` and `libarchive` modules.
+
+If you give a schema name using the `-n` switch, all the tables will be moved
+to the given schema. This schema will be created in the script.
+
+To load the _dba.stackexchange.com_ project in the `dba` schema, you would execute:
+`./load_into_pg.py -s dba -n dba`
+
+The paths are not changed in the final scripts `sql/final_post.sql` and
+`sql/optional_post.sql`. To run them, first set the _search_path_ to your
+schema name: `SET search_path TO <myschema>;`
+
+## Caveats and TODOs
 
  - It prepares some indexes and views which may not be necessary for your analysis.
  - The `Body` field in `Posts` table is NOT populated by default. You have to use `--with-post-body` argument to include it.