Python study notes-day6-[How to connect to mysql database]

Record how python connects to the Mysql database. It will be used frequently in the future. It feels very important.

 

1. Install the pymysql library

#pip install pymysql

 

Second, connect to the mysql database

1. Connection steps

 

2. Practical operation, how to connect the code connection

Connection string:

conn = pymysql.connect( 
    host='127.0.0.1',user='xxx',passwd='xxxxxxx', 
    port=3306,db='xxxxx',charset='utf8' 
    #port must write int type 
    #charset utf8 must be written here 
) #Query 

data

 

#insert data

 

3. The integration connection process is a function 

1. Example

#Encapsulate a function to perform database operations

 

#Encapsulate a function to perform database operations 
def my_db(host,user, passwd, db,sql, port=3306, charset='utf8'): 
    import pymysql 
    conn = pymysql.connect(user=user, 
                           host=host, 
                           port=port , 
                           passwd=passwd, 
                           db=db, 
                           charset=charset 
                           ) 
    cur = conn.cursor() #Create a cursor 
    cur.execute(sql) #Execute mysql 
    if sql.strip()[:6].upper() == 'SELECT ': 
        res = cur.fetchall() 
    else: 
        conn.commit() 
        res = 'ok' 
    cur.close() 
    conn.close() 
    return res