Updating a Database
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import MySQLdb import MySQLdb.cursors
def get_column_name( data, prompt, names ) : value=-1 while value == -1: idx = 1 for col in data : print str(idx) + ": " + col names.append( col ) idx = idx + 1 value = int( raw_input(prompt) ) if value < 1 or value >= idx : value = -1 return value
conn = MySQLdb.Connect( host='localhost', user='python-test', passwd='python', db='python-test') cursor = conn.cursor(cursorclass=MySQLdb.cursors.DictCursor)
cursor.execute("SELECT * FROM books") data = cursor.fetchone()
names = [] old_value = get_column_name( data, "Which column do you want to change records for? ", names ) names = [] new_value = get_column_name( data, "Which column do you want to change records to? ", names )
old_val = raw_input("What value do you want to change for " + names[old_value-1] + ": ") new_val = raw_input("What value do you want to change to for " + names[new_value-1] + ": ")
stmt = "UPDATE books SET " + names[new_value-1] + " = '"+ new_val + "' WHERE " + names[old_value-1] + " = '" + old_val + "'" print stmt cursor.execute(stmt) print "Rows affected: " + str(cursor.rowcount)
cursor.close() conn.commit() conn.close()
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