python3.4 An implementation that writes and outputs data to mysql5.7 using a loop

As shown below:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# __author__ = "blzhu"
"""
python study
Date : 2017
"""
import pymysql
# import MySQLdb #python2 The products of 

try:
  #  To obtain 1 Three database connections, note if yes UTF-8 Type, you need to specify the database 
  conn = pymysql.connect(host='localhost', user='root', passwd='root', db='zbltest1', port=3306, charset='utf8')
  cur = conn.cursor() #  To obtain 1 A cursor 
  for i in range(1, 10):
    zbl_id = str(i)
    zbl_name = 'zbl'+str(i)
    zbl_gender = 'man'
    # print("%s,%s,%s" % (zbl_id,zbl_name,zbl_gender))
    # sql = "insert student VALUES (id='%s',name='%s',gender='%s')" % (zbl_id,zbl_name,zbl_gender)
    sql = "insert student VALUES ('%s','%s','%s')" % (zbl_id, zbl_name, zbl_gender)
    # print(sql)
    cur.execute(sql)
  conn.commit()#  Write the data to the database 

    # try:
    # cur.execute(sql)
      # cur.commit()
    # except:
    #   cur.rollback()
    #cur.execute("""INSERT INTO 'student' ('id','name','gender') VALUES (%s,%s,%s ,(zbl_id,zbl_name,zbl_gender,))""")
    #cur.execute("""INSERT INTO 'student' ('id','name','gender') VALUES (zbl_id,zbl_name,zbl_gender)""")

    # cur.execute("INSERT student VALUES (zbl_id,zbl_name,zbl_gender)")

  # cur.execute("INSERT student VALUES ('4', 'zbl4', 'man')")#  correct 
  #cur.execute("INSERT INTO 'student' ('id','name','gender') VALUES ('4', 'zbl4', 'man')")# error 
  #cur.execute("INSERT student ('id','name','gender') VALUES ('4', 'zbl4', 'man')")


  cur.execute('select * from student')
  # data=cur.fetchall()
  for d in cur:
    #  Pay attention to int The type needs to be used str Function to escape 
    print("ID: " + str(d[0]) + '  Name:  ' + d[1] + "  Gender:  " + d[2])
  print("row_number:", (cur.rownumber))
  # print('hello')

  cur.close() #  Close the cursor 
  conn.close() #  Release database resources 
except Exception:
  print(" An exception occurs ")

The above code is correct, but it is tortuous.

The following is the summary:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# __author__ = "blzhu"
"""
python study
Date : 2017
"""
import pymysql
try:
  #  To obtain 1 Three database connections, note if yes UTF-8 Type, you need to specify the database 
  conn = pymysql.connect(host='localhost', user='root', passwd='root', db='zbltest1', port=3306, charset='utf8')
  cur = conn.cursor() #  To obtain 1 A cursor 
  for i in range(1, 10):
    zbl_id = str(i)
    zbl_name = 'zbl'+str(i)
    zbl_gender = 'man'
    # print("%s,%s,%s" % (zbl_id,zbl_name,zbl_gender))
    # sql = "insert student VALUES (id='%s',name='%s',gender='%s')" % (zbl_id,zbl_name,zbl_gender)
    sql = "insert student VALUES ('%s','%s','%s')" % (zbl_id, zbl_name, zbl_gender)
    # print(sql)
    cur.execute(sql)
  conn.commit()#  Write the data to the database 
  cur.execute('select * from student')
  # data=cur.fetchall()
  for d in cur:
    #  Pay attention to int The type needs to be used str Function to escape 
    print("ID: " + str(d[0]) + '  Name:  ' + d[1] + "  Gender:  " + d[2])
  print("row_number:", (cur.rownumber))
  # print('hello')

  cur.close() #  Close the cursor 
  conn.close() #  Release database resources 
except Exception:
  print(" An exception occurs ")

#!/usr/bin/python3
import pymysql
import types

db=pymysql.connect("localhost","root","123456","python");

cursor=db.cursor()

# create user table 
cursor.execute("drop table if exists user")
sql="""CREATE TABLE IF NOT EXISTS `user` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `name` varchar(255) NOT NULL,
   `age` int(11) NOT NULL,
   PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=0"""

cursor.execute(sql)


#user Insert data 
sql="""INSERT INTO `user` (`name`, `age`) VALUES
('test1', 1),
('test2', 2),
('test3', 3),
('test4', 4),
('test5', 5),
('test6', 6);"""

try:
  #  perform sql statements 
  cursor.execute(sql)
  #  Commit to the database for execution 
  db.commit()
except:
  #  If an error occurs, roll back 
  db.rollback()
  
  
# update 
id=1
sql="update user set age=100 where id='%s'" % (id)
try:
  cursor.execute(sql)
  db.commit()
except:
  db.rollback()
  
# delete 
id=2
sql="delete from user where id='%s'" % (id)
try:
  cursor.execute(sql)
  db.commit()
except:
  db.rollback()
  
  
# The query 
cursor.execute("select * from user")

results=cursor.fetchall()

for row in results:
  name=row[0]
  age=row[1]
  #print(type(row[1])) # Print variable type  <class 'str'>

  print ("name=%s,age=%s" % \
       (age, name))