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PostgreSQL foreign data wrapper for MySQL
C Makefile C++
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MySQL FDW for PostgreSQL 9.1+ ============================== This PostgreSQL extension implements a Foreign Data Wrapper (FDW) for the MySQL. This code is experimental, and largely intended as a pet project for me to experiment with and learn about FDWs in PostgreSQL. By all means use it, but do so entirely at your own risk! You have been warned! Building -------- Install MySQL, or just the C client library, and Once that's done, the extension can be built with: PATH=/usr/local/pgsql/bin/:/usr/local/mysql/bin:$PATH make USE_PGXS=1 sudo PATH=/usr/local/pgsql/bin/:/usr/local/mysql/bin:$PATH make USE_PGXS=1 install (assuming you have PostgreSQL 9.1 in /usr/local/pgsql and MySQL in /usr/local/mysql). I've tested on Mac OS X 10.7 only, but other *nix's should also work. I haven't tested on Windows, but the code should be good on MinGW. Limitations ----------- - No attempt is made to pushdown quals to MySQL. - The MySQL connection used to plan queries isn't currently reused during execution. Usage ----- The following parameters can be set on a MySQL foreign server: address: The address or hostname of the MySQL server. Default: 127.0.0.1 port: The port number on which the MySQL server is listening. Default: 3306 The following parameter can be set on a MySQL foreign table: database: The name of the MySQL database to query. Default: NULL query: An SQL query to define the data set on the MySQL server. table: The name of a table (quoted and qualified as required) on the MySQL table. Note that the query and table paramters are mutually exclusive. Using query can provide either a simple way to push down quals (which of course is fixed at definition time), or to base remote tables on more complex SQL queries. The following parameter can be set on a user mapping for a MySQL foreign server: username: The username to use when connecting to MySQL Default <none> password: The password to authenticate to the MySQL server with. Default: <none> Example ------- -- Create the require functions for the FDW. CREATE FUNCTION mysql_fdw_handler() RETURNS fdw_handler AS '$libdir/mysql_fdw' LANGUAGE C STRICT; CREATE FUNCTION mysql_fdw_validator(text, oid) RETURNS void AS '$libdir/mysql_fdw' LANGUAGE C STRICT; -- Create the data wrapper or "transport". CREATE FOREIGN DATA WRAPPER mysql_fdw HANDLER mysql_fdw_handler VALIDATOR mysql_fdw_validator; -- Create the foreign server, a pointer to the MySQL server. CREATE SERVER mysql_svr FOREIGN DATA WRAPPER mysql_fdw OPTIONS (address '127.0.0.1', port '3306'); -- Create one or more foreign tables on the MySQL server. The first of -- these maps to a remote table, whilst the second uses an SQL query. CREATE FOREIGN TABLE employees ( id integer, name text, address text) SERVER mysql_svr OPTIONS (table 'hr.employees'); CREATE FOREIGN TABLE overtime_2010 ( id integer, employee_id integer, ot_date date, ot_hours integer)) SERVER mysql_svr OPTIONS (query 'SELECT * FROM overtime WHERE year = 2010;'); -- Create a user mapping to tell the FDW the username/password to -- use to connect to MySQL, for PUBLIC. This could be done on a per- -- role basis. CREATE USER MAPPING FOR PUBLIC SERVER mysql OPTIONS (username 'dpage', password ''); -- Dave Page firstname.lastname@example.org