Update database with multiple SQL Statments

Question

I am using mysql connector.Python 1.0.9 downloaded from MySQL site.

I have a sample table here

DROP TABLE IF EXISTS my_table; 
CREATE TABLE my_table
(id          


        

Answer 1

Looking at the MySQL docs

If multi is set to True, execute() is able to execute multiple statements specified in the operation string. It returns an iterator that enables processing the result of each statement. However, using parameters does not work well in this case, and it is usually a good idea to execute each statement on its own.

so setting multi=True returns an iterator and if you just want to loop through each statement, the other solution offered works well:

for result in cursor.execute(SQL, multi=True):
    pass

Answer 2

You need to have somekind of commit

cnx.commit()

MySQL reference

Answer 3

Another option is to use executemany, as follows:

sql=('insert into articulos (descripcion, precio) values(%s,%s)')  
data=[('naranjas',22), ("pomelos", 29), ("frutillas", 130)]

cursor.executemany(sql,data) 

Answer 4

At-last after a long research on docs and help. I could able to solve the issue.

Using a for loop at cursor.execute with multi=True worked. I don't know why we need to loop through.

for result in cursor.execute(SQL, multi=True):
    pass

Without loop just cursor.execute(SQL, multi=True) did not do any changes in the database.

import mysql.connector

cnx = mysql.connector.connect(user='scott', database='test')
cursor = cnx.cursor()

SQL = '''
    update my_table 
    set 
    LAY = 'P6682'
    , BLK = 'P6682'
    , ANI = 'P6682'
    where
    Shot = 'SH01';

    update my_table 
    set 
    LAY = '1863'
    , BLK = '1863'
    , ANI = '1863'
    where
    Shot = 'SH02'
'''

for result in cursor.execute(SQL, multi=True):
    pass

cnx.commit()
cur.close()
cnx.close()
cnx.disconnect()