0.2

dbtable.py

@@ -39,14 +39,6 @@ class DbTable:
         self.dbconn.conn.commit()
         return
 
-    def delete(self, val):
-        sql = "DELETE FROM " + self.table_name()
-        sql += " WHERE " + "".join(self.column_names_without_id())
-        sql += "=" + "'" + "".join(val) + "';"
-        cur = self.dbconn.conn.cursor()
-        cur.execute(sql)
-        self.dbconn.conn.commit()
-
     def drop(self):
         sql = "DROP TABLE IF EXISTS " + self.table_name()
         cur = self.dbconn.conn.cursor()
@@ -66,7 +58,6 @@ class DbTable:
         cur = self.dbconn.conn.cursor()
         try:
             cur.execute(sql)
-            self.dbconn.conn.commit()
         except psycopg2.errors.UniqueViolation:
             self.dbconn.conn.rollback()
         return

main.py

@@ -138,11 +138,11 @@ class Main:
         if self.cath_id == -1:
             while True:
                 name = input("Укажите название категории для вывода блюд (0 - отмена):")
-                while len(name.strip()) == 0:
+                while len(name.strip()) == '':
                     name = input("Пустая строка. Повторите ввод! Укажите название категории для вывода блюд (0 - отмена):")
                 if name == "0":
                     return "1"
-                cath = CathTable().find_by_position(int(name))
+                cath = CathTable().find_by_name(name)
                 if not cath:
                     print("Введено неверное название!")
                 else:

tables/cath_table.py

@@ -13,14 +13,25 @@ class CathTable(DbTable):
     def table_constraints(self):
         return ['CONSTRAINT "Name" UNIQUE (cath_name)']
     
-    
+    def delete(self, val):
-    def find_by_position(self, num):
+        sql = "DELETE FROM " + self.table_name()
-        
+        sql += " WHERE " + "".join(self.column_names_without_id())
-        sql = "SELECT * FROM " + self.table_name()
+        sql += "=" + "'" + "".join(val) + "';"
-        sql += " ORDER BY "
-        sql += ", ".join(self.primary_key())
-        sql += " LIMIT 1 OFFSET %(offset)s"
         cur = self.dbconn.conn.cursor()
-        cur.execute(sql, {"offset": num - 1})
+        cur.execute(sql)
+        self.dbconn.conn.commit()
+    
+    def find_by_name(self, name):
+        cur = self.dbconn.conn.cursor()
+        
+        sql_sel = "SELECT id FROM " + self.table_name()
+        sql_sel += " WHERE cath_name = " + "'" + name + "'" + ";"
+        cur.execute(sql_sel) 
+        # sql = "SELECT * FROM " + self.table_name()
+        # sql += " ORDER BY "
+        # sql += ", ".join(self.primary_key())
+        # sql += " LIMIT 1 OFFSET %(offset)s"
+        # cur.execute(sql, {"offset": num - 1})
+        # print(cur)
         return cur.fetchone()