Merge pull request #915 from dbcli/j-bennet/add-server-version

Print server version as part of welcome message.

pgcli/main.py

@@ -599,6 +599,7 @@ class PGCli(object):
         self.cli = self._build_cli(history)
 
         if not self.less_chatty:
+            print('Server: PostgreSQL', self.pgexecute.get_server_version())
             print('Version:', __version__)
             print('Chat: https://gitter.im/dbcli/pgcli')
             print('Mail: https://groups.google.com/forum/#!forum/pgcli')

pgcli/pgexecute.py

@@ -183,6 +183,8 @@ class PGExecute(object):
         SELECT pg_catalog.pg_get_functiondef(f.f_oid)
         FROM f'''
 
+    version_query = "SELECT current_setting('server_version')"
+
     def __init__(self, database, user, password, host, port, dsn, **kwargs):
         self.dbname = database
         self.user = user
@@ -191,8 +193,19 @@ class PGExecute(object):
         self.port = port
         self.dsn = dsn
         self.extra_args = {k: unicode2utf8(v) for k, v in kwargs.items()}
+        self.server_version = None
         self.connect()
 
+    def get_server_version(self):
+        if self.server_version:
+            return self.server_version
+        with self.conn.cursor() as cur:
+            _logger.debug('Version Query. sql: %r', self.version_query)
+            cur.execute(self.version_query)
+            result = cur.fetchone()
+            self.server_version = result[0] if result else ''
+            return self.server_version
+
     def connect(self, database=None, user=None, password=None, host=None,
                 port=None, dsn=None, **kwargs):
 
@@ -280,18 +293,15 @@ class PGExecute(object):
         else:
             return json_data
 
-
     def failed_transaction(self):
         status = self.conn.get_transaction_status()
         return status == ext.TRANSACTION_STATUS_INERROR
 
-
     def valid_transaction(self):
         status = self.conn.get_transaction_status()
         return (status == ext.TRANSACTION_STATUS_ACTIVE or
                 status == ext.TRANSACTION_STATUS_INTRANS)
 
-
     def run(self, statement, pgspecial=None, exception_formatter=None,
             on_error_resume=False):
         """Execute the sql in the database and return the results.
@@ -707,7 +717,6 @@ class PGExecute(object):
             for row in cur:
                 yield row
 
-
     def casing(self):
         """Yields the most common casing for names used in db functions"""
         with self.conn.cursor() as cur: