cartodb-postgresql/README.md

cartodb-postgresql
==================

[![Build Status](http://travis-ci.org/CartoDB/cartodb-postgresql.png)]
(http://travis-ci.org/CartoDB/cartodb-postgresql)

PostgreSQL extension for CartoDB

See https://github.com/CartoDB/cartodb/wiki/CartoDB-PostgreSQL-extension

Dependencies
------------

 * PostgreSQL 9.3+ (with plpythonu extension)
 * [PostGIS extension](http://postgis.net) 
 * [Schema triggers extension]
   (https://bitbucket.org/malloclabs/pg_schema_triggers)
   (or [fork](https://github.com/CartoDB/pg_schema_triggers))

Install
-------

 make all install

Test installation
-----------------

 make installcheck

NOTE: if ``test_ddl_triggers`` fails it's likely due to an incomplete
      installation of schema_triggers: you need to add ``schema_triggers.so``
      to the ``shared_preload_libraries`` setting in postgresql.conf !

Enable database
---------------

In a database that needs to be turned into a "cartodb" user database, run:

```sql
CREATE EXTENSION postgis;
CREATE EXTENSION schema_triggers;
CREATE EXTENSION cartodb;
```

Migrate existing cartodb database
---------------------------------

When upgrading an existing cartodb user database, the cartodb extension
can be migrated from the "unpackaged" version. The procedure will copy
the data from ``public.CDB_TableMetada`` to ``cartodb.CDB_TableMetadata``,
re-cartodbfy all tables using old functions in triggers and drop the
cartodb functions from the 'public' schema. All new cartodb objects will
be in the "cartodb" schema.

```sql
CREATE EXTENSION postgis FROM unpackaged;
CREATE EXTENSION schema_triggers;
CREATE EXTENSION cartodb FROM unpackaged;
```

Update cartodb extension
------------------------

Updating the version of cartodb extension installed in a database
is done using ALTER EXTENSION.

```sql
ALTER EXTENSION cartodb UPDATE TO '0.1.1';
```

The target version needs to be installed on the system first
(see Install section).

If the "TO 'x.y.z'" part is omitted, the extension will be updated to the
latest installed version, which you can find with the following command:

```sh
grep default_version `pg_config --sharedir`/extension/cartodb.control
```

Updates are performed by PostgreSQL by loading one or more migration scripts
as needed to go from the installed version S to the target version T.
All migration scripts are in the "extension" directory of PostgreSQL:

```sh
ls `pg_config --sharedir`/extension/cartodb*
```

During development the cartodb extension version doesn't change with
every commit, so testing latest change requires cheating with PostgreSQL
so to enforce re-load of the scripts. To help with cheating, "make install"
also installs migration scripts to go from "V" to "V"next and from "V"next
to "V". Example to upgrade a 0.2.0dev version:

```sql
ALTER EXTENSION cartodb UPDATE TO '0.2.0devnext';
ALTER EXTENSION cartodb UPDATE TO '0.2.0dev';
```

Starting with 0.2.0, the in-place reload can be done with an ad-hoc function:

```sql
SELECT cartodb.cdb_extension_reload();
```