python to mysql (MariaDB) insert query with variable error

Question

I am trying use insert query to write to a MariaDB database using Python(3.6).

I am able to successfully connect to the database but insert query with variable doesn't seem to work. But, when I use insert query directly inside .execute() without variable, it seems to work.

script = "insert INTO Table1 (Column1) VALUES (%s)"
val=("911")
mycursor.execute(script,val)

I am getting following programming error for above code:

ProgrammingError: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '%s)' at line 1

Any pointers in right direction would be appreciated.

Answer 1

Either you need to set the paramstyle to 'format' or you have to use another paramstyle. In MySQL Connector/Python eg the default paramstyle is 'pyformat' and not 'format' .

Answer 2

That is the problem

>>> val=("911")
>>> type(val)
<class 'str'>
>>> val
'911'

In Python3, redundant parentheses will be removed so it will interpret it as a string and not a tuple, which is required when working with %s . You need to use val=('911",) to force val to be of type tuple

>>> val=("911",)
>>> type(val)
<class 'tuple'>
>>> val
('911',)

Answer 3

script = "insert INTO Table1 (Column1) VALUES ('%s')"
val=("911")
mycursor.execute(script,val)

Try this, I used to have similar issues with sqlite3.