Add try-except for course creation

Author: AlinGeorgescu

README.md

@@ -146,6 +146,8 @@ Project Link: [Math-Bot](https://github.com/AlinGeorgescu/Math-Bot)
 ## Acknowledgements
 * [Othneil Drew](https://github.com/othneildrew/Best-README-Template) -
   README template
+* [Rod Pierce & Math is fun](http://www.mathsisfun.com) - Some graphics for the
+  courses
 
 <!-- MARKDOWN LINKS & IMAGES -->
 [contributors-shield]: https://img.shields.io/github/contributors/AlinGeorgescu/Math-Bot.svg?style=for-the-badge

courses.json

@@ -207,7 +207,7 @@
         {
             "test_step_inner_id": 1,
             "test_step_text": "What do we use a geometric instrument for?",
-            "test_step_ans": "We user a geometric instrument for drawing figures.",
+            "test_step_ans": "We use a geometric instrument for drawing figures.",
             "course_id": 1
         },
         {

src/database_adapter/database_adapter.py

@@ -119,7 +119,13 @@ def populate_postgres():
                         sql.SQL(", ").join(map(sql.Literal, values)),
                     )
 
-            cursor.execute(query)
+            try:
+                cursor.execute(query)
+            except psycopg2.DatabaseError as err:
+                cursor.close()
+                CONN.rollback()
+                LOGGER.critical(err.pgcode, err.pgerror)
+                sys.exit()
 
     # Check the existence of "course_steps" table (and create it).
     cursor.execute(
@@ -158,7 +164,13 @@ def populate_postgres():
                         sql.SQL(", ").join(map(sql.Literal, values)),
                     )
 
-            cursor.execute(query)
+            try:
+                cursor.execute(query)
+            except psycopg2.DatabaseError as err:
+                cursor.close()
+                CONN.rollback()
+                LOGGER.critical(err.pgcode, err.pgerror)
+                sys.exit()
 
     # Check the existence of "mid_questions" table (and create it).
     cursor.execute(
@@ -196,7 +208,13 @@ def populate_postgres():
                         sql.SQL(", ").join(map(sql.Literal, values)),
                     )
 
-            cursor.execute(query)
+            try:
+                cursor.execute(query)
+            except psycopg2.DatabaseError as err:
+                cursor.close()
+                CONN.rollback()
+                LOGGER.critical(err.pgcode, err.pgerror)
+                sys.exit()
 
     # Check the existence of "test_steps" table (and create it).
     cursor.execute(
@@ -235,7 +253,13 @@ def populate_postgres():
                         sql.SQL(", ").join(map(sql.Literal, values)),
                     )
 
-            cursor.execute(query)
+            try:
+                cursor.execute(query)
+            except psycopg2.DatabaseError as err:
+                cursor.close()
+                CONN.rollback()
+                LOGGER.critical(err.pgcode, err.pgerror)
+                sys.exit()
 
     # Check the existence of "users" table (and create it).
     cursor.execute(