I work with the Python mysql.connector for the first time and I am not able to create a working insert statement.
This is the table:
'CREATE TABLE IF NOT EXISTS products (id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(255));'
I am trying to insert a variable as title while the id should be auto incremented. I have tried multiple solutions but it simply won't work.
def insert_product(title: str):
insert_product_query = 'INSERT INTO products (title) VALUES (%s);'
cursor.execute(insert_product_query, (title,))
This runs without any error, but the insert is not working. It does nothing. I tried multiple versions of this, with '?' instead of '%s' and without a tuple but it won't work.
Another solution I tried is this:
def insert_product(title: str):
insert_product_query = f'INSERT INTO products (title) VALUES (\'{title}\')'
print(insert_product_query)
cursor.execute(insert_product_query)
I printed the insert statement and when I copy paste it directly into the database it works perfectly, so I don't have any idea why it is not working out of the python code as it is not producing any errors.
I found many similar problems but none of the solution worked for me.
I hope someone can help me as I might overlook something obvious.
Thanks in advance!
Python's connector disables autocommit by default (as a reasonable library would do!). You need to explicitly commit after you perform a DML statement:
con.commit() # Assuming con is the name of the connection variable
Related
I had no problem with SELECTing data in python from postgres database using cursor/execute. Just changed the sql to INSERT a row but nothing is inserted to DB. Can anyone let me know what should be modified? A little confused because everything is the same except for the sql statement.
<!-- language: python -->
#app.route("/addcontact")
def addcontact():
# this connection/cursor setting showed no problem so far
conn = pg.connect(conn_str)
cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
sql = f"INSERT INTO jna (sid, phone, email) VALUES ('123','123','123')"
cur.execute(sql)
return redirect("/contacts")
first look at your table setup and make sure your variables are named right in the right order, format and all that, if your not logging into the specific database on the sql server it won't know where the table is, you might need to send something like 'USE databasename' before you do your insert statement so your computer is in the right place in the server.
I might not be up to date with the language but is that 'f' supposed to be right before the quotes? if thats in ur code that'd probably throw an error unless it has a use im not aware of or its not relevant to the problem.
You have to commit your transaction by adding the line below after execute(sql)
conn.commit()
Ref: Using INSERT with a PostgreSQL Database using Python
When I make a MySQL table order, it is created successfully but, when I execute any query against it, it says "error 1064 , syntax error".
When I change the name to orders, it works fine.
But I don't want to change the name. How can I execute our query against the order table?
can you use something like?
select * from `order`
The word order is actually an SQL keyword. You would have the same problem if you tried to use a table called group or select. You can fix it is MySQL by using quotes around it, along the lines of:
select f1, f2 from `order` where blah blah blah ...
However, unless your table will only ever hold a single order (in which case it won't do so for long since the underlying business will soon be bankrupt), you should probably call your table orders.
That solves both your problems, the one you found and the one you didn't :-)
I got here because I was searching for similar solution for SQL CE. There using
order
'order'
"order"
doesn't work.
What worked was:
[order]
Maybe it'll help someone else also.
This should fix the problem:
e.g
mysql>
Create table order(
ID char(5),
QTY(3)
)
;
For the record, I have looked into this, but cannot seem to figure out what is wrong.
So I'm doing the tutorial on web.py, and I get to the database part (can do everything above it). I wanted to use sqlite3 for various reasons. Since I couldn't figure out where to type the
sqlite3 test.db
line, I look into the sqlite3 module, and create a database with that. The code for that is:
import sqlite3
conn = sqlite3.connect("test.db")
print("Opened database successfully");
conn.execute('''CREATE TABLE todo
(id serial primary key,
title text,
created timestamp default now(),
done boolean default 'f');''')
conn.execute("INSERT INTO todo (title) VALUES ('Learn web.py')");
but I get the error
done boolean default 'f');''')
sqlite3.OperationalError: near "(": syntax error
I've tried looking into this, but cannot figure out for the life of me what the issue is.
I haven't had luck with other databases (new to this, so not sure on the subtleties), I wasn't able to just make the sqlite database directly so it might be a python thing, but it matches the tester.py I made with the sqlite with python tutorial...
Thanks if anyone can help me!
The problem causing the error is that you can't use the MySQL now() function here. Try instead
created default current_timestamp
This works:
conn.execute('''CREATE TABLE todo
(id serial primary key,
title text,
created default current_timestamp,
done boolean default 'f');''')
You are using SQLite but are specifying data types from some other database engine. SQLite accepts only INT, TEXT, REAL, NUMERIC, and NONE. Boolean is most likely being mapped to one of the number types and therefore DEFAULT 'F' is not valid syntax (although I don't think it would be valid in any version of SQL that does support BOOLEAN as a datatype, since they general use INTEGER for the underlying storage).
Rewrite the CREATE TABLE statement with SQLite datatypes and allowable default values and your code should work fine.
More details on the (somewhat unusual) SQLite type system: http://www.sqlite.org/datatype3.html
I am trying to insert some data into a pysqlite database but even tho the code runs fine with no errors nothing shows up in the database and i have made sure that the variable does contain a value
cur = self.con.execute("insert into urllist(url) values('%s')" % seed)
i have double checked the table and column name and they are also correct
Are you calling con.commit() ?
Apparently changes are lost unless this method is used before closing the connection.
http://readthedocs.org/docs/pysqlite/en/latest/sqlite3.html
I'm trying to run a simple insert query to a database. I have it configured correctly, and it should work, but it doesn't. For some reason I get the following error on this query:
Query:
INSERT INTO searches (query) VALUES ('test')
Error:
(1062, "Duplicate entry 'test' for key 'query'")
The query runs without problems in the MySQL console so it must be a problem with Python? Here's my Python code:
def increase_search_count(search_query):
from django.db import connection, transaction
search_query = search_query.strip()
cursor = connection.cursor()
rows = cursor.execute("INSERT INTO searches (query) VALUES ('test')")
I know there are much better ways to handle databases, but I'm new to Python, and I have a deadline. I'd just like to get this to work, I have another SELECT query in another function and that one runs without any problems!
Any ideas what might be wrong?
The way that query is constructed means you will always be inserting 'test' into the database, and seeing the query is likely the primary key in your table, it will be creating duplicate rows.
The query should be something like "INSERT INTO searches (query) VALUES ('" variable "')" so you don't insert the same value over and over.