How to delete row in PostgreSQL using Python?

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I want to delete the whole row when user enters the id. If it matches, I completely delete whole row from table.

@staticmethod
    def close_account(value):
        check()
        rows = cur.fetchall()
        for row in rows:
            if rows is None:
                print("Sorry It's an Empty.............. ")
                return True
            elif rows[0] == value:
                del_row = "Delete From customer where id = value"
                cur.execute(del_row)
                return True

It shows error in del_row that:

value is unable to resolve column value

Even if I enter the id = 1 it also does not delete the row.

Considering your id attribute is a string, change this line:

del_row = "Delete From customer where id = value"

to:

del_row = "Delete From customer where id = %s" % value

The way you have it, the database is trying to delete DELETE FROM customer WHERE id="value", whereas your goal is to replace value with the function parameter (e.g. DELETE FROM customer WHERE id="123"

Disclaimer: This solution makes your code susceptible to SQL injection

PostgreSQL DELETE - Deleting Rows in a Table, Deletion of rows of a PostgreSQL database table from a Python program is done through executing the SQL DELETE statement through a cursor object of� To delete data from the PostgreSQL table in Python, you use the following steps: First, create a new database connection by calling the connect () function of the psycopg module. conn = psycopg2.connect (dsn) The connect () function returns a new connection object. Next, to execute any statement, you need a cursor object.

There are a couple of problems here. Primarily you're not passing a value in for the id = X condition in your query, so you'll need to do that - preferably using a parameterized query, that looks like this:

del_row = "DELETE FROM customer WHERE id = %s"
cur.execute(del_row, (1))

Your second problem is the assumption that the row ID is 1, when this may not be the case. If your ID field is auto incrementing, then it may be far greater than that. If your original query is returning the ID as a column, you should be able to retrieve the row ID using something like:

row[0]

Which, when passed into the first code block, means you end up with something like this:

@staticmethod
def close_account(value):
    check()
    rows = cur.fetchall()
    for row in rows:
        if rows is None:
            print("Sorry It's an Empty.............. ")
            return True
        elif rows[0] == value:
            del_row = "DELETE FROM customer WHERE id = %s"
            cur.execute(del_row, row[0])
            return True

Delete rows of a PostgreSQL database table using Python , 'TagNaam' is not a valid column_name identifier in sql language. You must not use single or double quotes in writing database name, table� Deletion of rows of a PostgreSQL database table from a Python program is done through executing the SQL DELETE statement through a cursor object of psycopg2.

"Delete From customer where id = %s" % value

will possibly get you what you want. On the other hand, it's a bad idea to programatically walk through all rows of the database to find a single one to delete, but I guess there are even bigger fish to fry first...

python: psycopg2: psql: Delete row where condition, In this section, We learn how to execute INSERT Query from python application to insert row or record to the PostgreSQL table using Psycopg2. Python PostgreSQL INSERT into database Table. Install psycopg2 using pip. Second, Establish a PostgreSQL database connection in Python. Then, Define the Insert query . All you need to know is the table it’s column details. Execute the INSERT query using cursor.execute() . In return, you can get a

Python PostgreSQL CRUD, Python PostgreSQL - Delete Data - You can delete the records in an existing table using the DELETE FROM statement of PostgreSQL database. Following statement deletes the record of the cricketer whose last name is 'Sangakkara'. − First, specify the table from which you want to delete data in the DELETE FROM clause. Second, specify which rows to delete by using the condition in the WHERE clause. The WHERE clause is optional. However, if you omit it, the DELETE statement will delete all rows in the table.

Python PostgreSQL - Delete Data, If you want to delete select rows from a table PostgreSQL allows you to combine the DELETE statement with the WHERE clause else it will delete� Python Program to delete a single row from a table using MySQL In this program, you will learn how to delete a single row from a table using Python and MySQL. create database xiith; use xiith; create table emp(id varchar(10), name varchar(30),salary int(10)) select * from emp;

PostgreSQL DELETE Row matching 1/2 Condition, Exits Example, TRUNCATE provides a faster mechanism to remove all rows from a table. There are two ways to delete rows in a table using information contained in other tables � Using the NumPy function np.delete(), you can delete any row and column from the NumPy array ndarray. numpy.delete — NumPy v1.15 Manual; Specify the axis (dimension) and position (row number, column number, etc.). It is also possible to select multiple rows and columns using a slice or a list. Here, the following contents will be described.

Comments
  • You need to parameterize that statement. Right now, Postgres thinks you have a column called value and you are comparing it to id. Since the column value does not exist you get the "unable to resolve column value" error.
  • How to assign parameter?
  • query must be del_row = f"Delete From customer where id = '{value}'"
  • it's still not working, this time it not show error but it also not remove data
  • Values should not be passed into the query using string formatting, please recommend query parameters instead. initd.org/psycopg/docs/usage.html#query-parameters
  • I'm aware it makes it susceptible to SQL injection, but I doubt the OP is worried about security or performance at this point. I don't get why would you downvote the answer, it actually answers the question. At most, it's not the most suitable solution. I added a disclaimer in the end
  • You should use parenthesis where it makes sense, and also make sure to close dittos, or you are susceptible to syntax errors.
  • It's a bad idea to format the string like this using Python's string formatting as it makes you vulnerable to SQL injection. Instead query parameterization should be used. initd.org/psycopg/docs/usage.html#query-parameters