Re: Error when doing sql - Mailing list pgsql-novice

On 12-Jun-2019/18:48 +0800, Cravan <savageapple850@gmail.com> wrote:
>Hi all,
>
>                Thank you for your replies. Now, I'm getting a weird error code when I try to store values from a csv
intoan sql table in a movie review assignment.I have already edited my apostrophes and spacing and looked up examples
fromgoogle to try and resolve my error to no avail. I also ensured that i defined DATABASE_URL properly. Please note
thatmy csv values are stored in lists in each cell. They are arranged in a single column such as 
>
>The Lego Movie;2014;100;tt1490017;7.8

One problem is that the table definition says imdbRating is an integer,
but the value in your example (7.8) is not an integer.


>
> Please refer to the files attached. Here is the error code I’m getting:
>
>
>
>######################################
>
>````
>
>Traceback (most recent call last):
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 1244, in _execute_context
>
>    cursor, statement, parameters, context
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/default.py", line 550, in do_execute
>
>    cursor.execute(statement, parameters)
>
>psycopg2.errors.UndefinedColumn: column "title" of relation "movies" does not exist
>
>LINE 1: INSERT INTO movies(title, year, runtime, imdbID, imdbRating)...
>
>                           ^
>
>
>
>
>
>The above exception was the direct cause of the following exception:
>
>
>
>Traceback (most recent call last):
>
>File "import.py", line 22, in <module>
>
>    main()
>
>  File "import.py", line 18, in main
>
>    {'title': title, 'year': year, 'runtime': runtime, 'imdbID': imdbID, 'imdbRating
>
>': imdbRating}) # substitute values from CSV line into SQL command, as per this dict
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 2166, in execute
>
>    return connection.execute(statement, *multiparams, **params)
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 982, in execute
>
>    return self._execute_text(object_, multiparams, params)
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 1155, in _execute_text
>
>    parameters,
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 1248, in _execute_context
>
>    e, statement, parameters, cursor, context
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 1466, in _handle_dbapi_exception
>
>    util.raise_from_cause(sqlalchemy_exception, exc_info)
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/util/compat.py", line 383, in raise_from_cause
>
>    reraise(type(exception), exception, tb=exc_tb, cause=cause)
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/util/compat.py", line 128, in reraise
>
>    raise value.with_traceback(tb)
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/base.py", line 1244, in _execute_context
>
>    cursor, statement, parameters, context
>
>  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-package
>
>s/sqlalchemy/engine/default.py", line 550, in do_execute
>
>    cursor.execute(statement, parameters)
>
>sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedColumn) column "title" of
>
> relation "movies" does not exist
>
>LINE 1: INSERT INTO movies(title, year, runtime, imdbID, imdbRating)...
>
>                           ^
>
>
>
>[SQL: INSERT INTO movies(title, year, runtime, imdbID, imdbRating) VALUES ((title),
>
>(year), (runtime), (imdbID), (imdbRating))]
>
>[parameters: {'title': 'Title', 'year': 'Year', 'runtime': 'Runtime', 'imdbID': 'imd
>
>bID', 'imdbRating': 'imdbRating\n'}]
>
>(Background on this error at: http://sqlalche.me/e/f405)
>
>````
>

>import csv
>import sys
>import os
>from sqlalchemy import Column, ForeignKey, Integer, String
>from sqlalchemy import create_engine
>from flask import Flask, render_template, request, session
>from flask_sqlalchemy import SQLAlchemy
>from flask_session import Session
>
>engine = create_engine(os.getenv("DATABASE_URL")) # database engine object from SQLAlchemy that manages connections to
thedatabase,# DATABASE_URL is an environment variable that indicates where the database lives 
>
>def main():
>    f = open("movies.csv","r")
>    reader = csv.reader(f)
>    for row in f: # loop gives each column a name
>        title,year,runtime,imdbID,imdbRating = row.split(';')
>        engine.execute('INSERT INTO movies(title, year, runtime, imdbID, imdbRating) VALUES ((title), (year),
(runtime),(imdbID), (imdbRating))', 
>                      {'title': title, 'year': year, 'runtime': runtime, 'imdbID': imdbID, 'imdbRating': imdbRating})
#substitute values from CSV line into SQL command, as per this dict 
>
>    engine.commit() # transactions are assumed, so close the transaction finished
>if __name__ == "__main__":
>    main()



--
Anthony E. Greene <mailto:agreene@pobox.com>