Merge pull request #5 from jsc0218/dev_gc

Dev gc

Author: jsc0218

README.md

@@ -56,9 +56,26 @@ We test this foreign data wrapper on Ubuntu Server 18.04 using PostgreSQL-11 tog
 
   sudo make uninstall
   ```
-  
+
+# Limitations
+
+- The first attribute in the table definition must be the primary key.
+
+- Composite primary key is not supported for now.  
+
 # Usage
 
+Before using this foreign data wrapper, you need to add it to ```shared_preload_libraries``` in your ```postgresql.conf``` 
+
+    shared_preload_libraries = 'kv_fdw'    # (change requires restart)
+
+and restart Postgres:
+
+
+```sh
+    sudo service postgresql restart  
+```
+
 This extension does not have any parameter. After creating the extension and corresponding server, you can use RocksDB as a foreign storage engine for your PostgreSQL.
 
 A simple example is as follows.

test/expected/basic.out

@@ -0,0 +1,42 @@
+--
+-- Test basic select, insert, delete, update operations
+--
+\c kvtest
+You are now connected to database "kvtest" as user "postgres".
+CREATE FOREIGN TABLE test(key TEXT, value TEXT) SERVER kv_server;  
+CREATE FOREIGN TABLE
+INSERT INTO test VALUES('YC', 'VidarDB');  
+INSERT 0 1
+SELECT * FROM test;  
+ key |  value  
+-----+---------
+ YC  | VidarDB
+(1 row)
+
+INSERT INTO test VALUES('California', 'Waterloo');  
+INSERT 0 1
+SELECT * FROM test;  
+    key     |  value   
+------------+----------
+ YC         | VidarDB
+ California | Waterloo
+(2 rows)
+
+DELETE FROM test WHERE key='California';  
+DELETE 1
+SELECT * FROM test;  
+ key |  value  
+-----+---------
+ YC  | VidarDB
+(1 row)
+
+UPDATE test SET value='VidarSQL';  
+UPDATE 1
+SELECT * FROM test;  
+ key |  value   
+-----+----------
+ YC  | VidarSQL
+(1 row)
+
+DROP FOREIGN TABLE test;  
+DROP FOREIGN TABLE

test/expected/basic.output

@@ -0,0 +1,14 @@
+--
+-- Delete the extension and server 
+--
+\c kvtest
+You are now connected to database "kvtest" as user "postgres".
+DROP SERVER kv_server;  
+DROP SERVER
+DROP EXTENSION kv_fdw;  
+DROP EXTENSION
+  
+\c postgres  
+You are now connected to database "postgres" as user "postgres".
+DROP DATABASE kvtest;  
+DROP DATABASE

test/expected/clear.out

@@ -1,11 +1,11 @@
 --
 --Create the extension and server for tests
 --
-CREATE DATABASE kvtest;
+CREATE DATABASE kvtest;  
 CREATE DATABASE
-\c kvtest
+\c kvtest  
 You are now connected to database "kvtest" as user "postgres".
-CREATE EXTENSION kv_fdw;
+CREATE EXTENSION kv_fdw;  
 CREATE EXTENSION
-CREATE SERVER kv_server FOREIGN DATA WRAPPER kv_fdw;
+CREATE SERVER kv_server FOREIGN DATA WRAPPER kv_fdw;  
 CREATE SERVER