Re: Encountered an error

On 03/10/2016 12:37 AM, Shaan Repswal wrote:
> I am trying to insert a new record into my "prototypedb" database. This
> here below is the section of my code that I am using to access and work
> on my database.
>
> What I am trying to do here is enter one record (three values) in three
> columns name, code and type. Then create a new column and then add one
> value to the new column for the aforementioned already entered record.
>
> cur = conn.cursor()
>
>         #Enter the three value basic record
>         cur.execute("""INSERT INTO inventory (name, code, type)
>                     VALUES (%s, %s, %s);""",
> [self.entry_product_name.get_text(), self.new_product_code.get_text(),
> self.new_product_type.get_text()])
>
>         #Take out list of Text Entry boxes
>         #self.quantity_list is a list of two value tuples each of which
> holds a reference to a text box in my GUI
>         for x in self.quantity_list:
>             if x[0].get_text() !="" and x[1].get_text() != "":
>                 #First make the appropriate column
>                 cur.execute("""ALTER TABLE inventory
>                             ADD %s integer DEFAULT NULL;""",
> [x[0].get_text()])
>                 #Then give that column the appropriate value for the
> current record
>                 cur.execute("""UPDATE inventory
>                             SET %s = %s
>                             WHERE name = %s;""", [x[0].get_text(),
> x[1].get_text(), self.entry_product_name.get_text()])
>             else:
>                 continue;
>
>         conn.commit()
>         cur.close()
>         conn.close()
>
>
> But Alas! There is an Error!
>
> Traceback (most recent call last):
>   File "C:\Python34\prototype_husk.py", line 134, in submit_data
>     ADD %s integer DEFAULT NULL;""", [x[0].get_text()])
> psycopg2.ProgrammingError: syntax error at or near "'26.2 LTRS'"
> LINE 2:                             ADD '26.2 LTRS' integer DEFAULT ...
>                                         ^
>

I'm having a very hard time imagining why it would ever make sense to
have a column called "26.2 LTRS", though Postgres will allow it. That
string represents a quantity in liters, correct? In that case, you
almost certainly want a column called something like "volume_in_liters"
into which you can insert the value "26.2".

--
Jonathan Rogers
Socialserve.com by Emphasys Software
jrogers@emphasys-software.com