Python MYSQL update statement

Question

I’m trying to get this Python MYSQL update statement correct(With Variables):

cursor.execute ("UPDATE tblTableName SET Year=%s" % Year ", Month=%s" % Month ", Day=%s" % Day ", Hour=%s" % Hour ", Minute=%s" Minute "WHERE Server=%s " % ServerID)

Any ideas where I’m going wrong?

Asked By: Adam Chetnik

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Source

Answer 1

It should be:

cursor.execute ("""
   UPDATE tblTableName
   SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s
   WHERE Server=%s
""", (Year, Month, Day, Hour, Minute, ServerID))

You can also do it with basic string manipulation,

cursor.execute ("UPDATE tblTableName SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s WHERE Server='%s' " % (Year, Month, Day, Hour, Minute, ServerID))

but this way is discouraged because it leaves you open for SQL Injection. As it’s so easy (and similar) to do it the right way^tm. Do it correctly.

The only thing you should be careful, is that some database backends don’t follow the same convention for string replacement (SQLite comes to mind).

Answered By: Esteban Küber

Answer 2

You’ve got the syntax all wrong:

cursor.execute ("""
   UPDATE tblTableName
   SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s
   WHERE Server=%s
""", (Year, Month, Day, Hour, Minute, ServerID))

For more, read the documentation.

Answered By: Paolo Bergantino

Answer 3

Here is the correct way：

import MySQLdb

if __name__ == '__main__':
    connect = MySQLdb.connect(host="localhost", port=3306,
                              user="xxx", passwd="xxx", db='xxx', charset='utf8')

    cursor = connect.cursor()

    cursor.execute("""
       UPDATE tblTableName
       SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s
       WHERE Server=%s
    """, (Year, Month, Day, Hour, Minute, ServerID))

    connect.commit()
    connect.close()

P.S. Don’t forget connect.commit(), or it won’t work

Answered By: Little Roys

Answer 4

Neither of them worked for me for some reason.

I figured it out that for some reason python doesn’t read %s. So use (?) instead of %S in you SQL Code.

And finally this worked for me.

   cursor.execute ("update tablename set columnName = (?) where ID = (?) ",("test4","4"))
   connect.commit()

Answered By: SVK

Answer 5

@Esteban Küber is absolutely right.

Maybe one additional hint for bloody beginners like me.
If you speciify the variables with %s, you have to follow this principle
for EVERY input value, which means for the SET-variables as well as for the WHERE-variables.

Otherwise, you will have to face a termination message like
‘You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘%s WHERE’

Answered By: M. Straube

Python MYSQL update statement

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