MySQL pymysql operation

 MySQL Strong performance , It is one of the most widely used databases at present , With  MySQL For learning the prototype, it is also convenient to master other databases later , Now let's give you Give a comprehensive explanation MySQL8.0 New features , From zero foundation to high-level one-stop learning , Combined with actual cases, we can gain something ！

▼ MySQL8.0 introduction - Advanced learning notes ：（ It's over ）

• The first 1 speak ：SQL Overview and database system introduction
• The first 2 speak ：MySQL brief introduction 、 Detailed installation steps and use
• The first 3 speak ：MySQL Common graphics management tools
• The first 4 speak ：MySQL Basic operation of database -DDL 
• The first 5 speak ：MySQL Basic operation of database -DML
• The first 6 speak ：MySQL Classification of constraints 、 Function and usage
• The first 7 speak ：MySQL Basic operation of database -DQL- The basic query
• The first 8 speak ：MySQL Multi table operation of
• The first 9 speak ：MySQL Aggregate functions 、 Date function 、 Window functions, etc
• The first 10 take ：MySQL View introduction of 、 Create and other operations
• The first 11 speak ：MySQL Stored procedure 、 Features and case exercises
• The first 12 speak ：MySQL Triggers and other operations 、 matters needing attention
• The first 13 speak ：MySQL The index of 、 classification 、 Characteristics, principles and related operations
• The first 14 speak ：MySQL Storage engine classification and operation
• The first 15 speak ：MySQL The business of 、 operation 、 Isolation level
• The first 16 speak ：MySQL Lock mechanism ：MyISAM Table locks 、InnoDB Row lock
• The first 17 speak ：MySQL Classification of log ： Error log 、 Binary log 、 Query log 、 Slow query log
• The first 18 speak ：MySQL Optimization analysis and efficiency implementation of
• The first 19 speak ：MySQL Of JDBC Operation and introduction cases  

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Use

PyMySQL It's pure. Python Realized MySQL Client library , Support compatibility Python 3, Used to replace MySQLdb..

import pymysql
 
conn = pymysql.connect(host='localhost', port=3306, user='root',password='123456',database='mydb17_pymysql', charset='utf8')
#  To obtain the cursor 
cursor = conn.cursor()
 
#  perform ＳＱＬ sentence   The return value is ＳＱＬ The number of lines affected by the statement during execution 
sql = "select * from student;"
 
row_count = cursor.execute(sql)
print("ＳＱＬ Number of rows affected by statement execution %d" % row_count)

 
#  Fetch a row in the result set    The result is a line 
# print(cursor.fetchone())
 
#  Take out all data in the result set 　　 Returns a row of data 
for line in cursor.fetchall():
    print(line)
#  Close cursor 
cursor.close()
#  Close the connection 
conn.close()

import pymysql
 
# obtain MySQL Connect 
conn = pymysql.connect(host='localhost', port=3306, user='root',password='123456',database='mydb17_pymysql', charset='utf8')
#  To obtain the cursor 
cursor = conn.cursor()
 
#  perform ＳＱＬ sentence   The return value is ＳＱＬ The number of lines affected by the statement during execution 
sql = "select * from student;"
 
row_count = cursor.execute(sql)
print("ＳＱＬ Number of rows affected by statement execution %d" % row_count)
 
#  Fetch a row in the result set    The result is a line 
# print(cursor.fetchone())
 
#  Take out all data in the result set 　　 Returns a row of data 
for line in cursor.fetchall():
    print(line)
#  Close cursor 
cursor.close()
#  Close the connection 
conn.close()

import pymysql
 
# obtain MySQL Connect 
conn = pymysql.connect(host='localhost', port=3306, user='root',password='123456',database='mydb17_pymysql', charset='utf8')
#  To obtain the cursor 
cursor = conn.cursor()
 
 
# insert data 
# sql = "insert into student values(%s,%s,%s)"
# data = (4, ' Chaogai ', 34)
# cursor.execute(sql, data)  #sql and data Between "," separate 
 
#  Modifying data 
# sql = "update student set sname=%s where sid=%s"
# data = (' Li Kui ', 4)
# cursor.execute(sql, data)
 
#  Delete data 
sql = "delete from student where sid=%s"
data = (4)
cursor.execute(sql, data)
 
 
conn.commit()   #  Submit , Otherwise, the inserted or modified data cannot be saved ( Don't forget to add )
#  Close cursor 
cursor.close()
#  Close the connection 
conn.close()