write read functionality

database.py

@@ -3,13 +3,14 @@ conditions (i.e. missing columns) without terminating the entire program. Use th
 handle database interactions, either as a standalone object or in a context manager."""
 import os
 import psycopg2
-
+from psycopg2 import DatabaseError
 
 DB_ADDRESS = os.getenv('DB_ADDRESS', 'localhost')
 DB_PORT = os.getenv('DB_PORT', 5432)
 DB_USER = os.getenv('DB_USER', 'postgres')
 DB_PASSWORD = os.getenv('DB_PASSWORD', '')
 DB_NAME = os.getenv('DB_NAME', 'postgres')
+DB_TABLE = os.getenv('DB_TABLE', 'cables')
 
 
 class DBConnector:
@@ -21,9 +22,12 @@ class DBConnector:
            db.read()
     """
     def _db_start(self):
-        self.conn = psycopg2.connect(
-            f"host={DB_ADDRESS} port={DB_PORT} dbname={DB_NAME} user={DB_USER} password={DB_PASSWORD}")
-        self.cur = self.conn.cursor()
+        try:
+            self.conn = psycopg2.connect(
+                f"host={DB_ADDRESS} port={DB_PORT} dbname={DB_NAME} user={DB_USER} password={DB_PASSWORD}")
+            self.cur = self.conn.cursor()
+        except DatabaseError as e:
+
 
     def _db_stop(self):
         self.cur.close()
@@ -45,7 +49,8 @@ class DBConnector:
         try:
             self.cur.execute(sql)
             result = self.cur.fetchall()
-        except psycopg2.DatabaseError as e:
+        except DatabaseError as e:
+            print(f"DB ERROR [{e.pgcode}]: {e.pgerror}")
             result = []
         return result
 
@@ -54,7 +59,13 @@ class DBConnector:
 
         :param kwargs: Column constraints; i.e. what value to filter by in what column.
         :returns: A list of dictionaries of all matching rows, or an empty list if no match."""
-        pass
+        args = []
+        for kw in kwargs.keys():
+            args.append(f"{kw} ILIKE {kwargs['kw']}")
+        query = f"SELECT * FROM {DB_TABLE}"
+        if len(args) > 0:
+            query += f" WHERE {' AND '.join(args)}"
+        return self._query(query)
 
     def write(self, **kwargs):
         """Write a row to the database.