python database connection _pymysql_01

--------installation

 pip install pymysql

 

------- main method

Connect (): 
the commit (): transaction commits, if not set to auto-commit, you must commit the transaction after each operation, otherwise the operation is invalid 
before the operation error, you can use this function to execute a transaction rollback: rollback ()

-------------- simple example: connect to the database

1. Database query the data

SELECT book_id,book_name FROM t_book WHERE market_rule=1

 

 

2. Connect database

import  pymysql
import types

# Connect to the database 
Connect = pymysql.connect (= Host " 192.168.6.41 " , User = " lrtsaudio " , password = " 2 & Ty3DW75i! (Vgo.l3Odp1fgWgEG " , Port = 3306, DB = " Audiobook " )
 # using the cursor () method create a cursor object 
the cursor = connect.cursor ()
 # use the cursor execute () method to perform sql statement 
cursor.execute ( " the SELECT book_id, book_name the FROM t_book the WHERE market_rule = 1 " )
 # use fetchall () Gets all data 
r1 = the cursor .fetchall ()
 Print (r1)
 Print (of the type (r1))
 #Close the cursor connection 
cursor.close ()
 # close the database connection 
connect.close ()

Results were as follows :( returned tuple)

 

 

You can also pass parameters through the dictionary: effect is the same

dbinfo={"host":"192.168.6.41",
        "user":"lrtsaudio",
        "password":"2&Ty3DW75i!(vgo.l3Odp1fgWgEG",
        "db":"audiobook"
}

sql="SELECT * FROM t_book WHERE market_rule=1"
connect1=pymysql.connect(**dbinfo)
cursor1=connect1.cursor()
cursor1.execute(sql)
r2=cursor1.fetchall()
print(r2)
cursor1.close()
connect1.close

 

 The parameters representative ------- connect () means

    Host = None,           # host address to connect to 
    User = None,           # database for the user's login 
    password = '' ,         # password 
    Database = None,       # database to connect to 
    Port = 0,              # port, typically 3306 
    unix_socket is = None ,    # choose whether to use unix_socket rather than TCP / IP 
    charset = '' ,          # character encoding 
    sql_mode = None,       # the default sql_mode to use. 
    read_default_file = None, # read from the default configuration file (my.ini or my.cnf) in parameters taken 
    CONV = None,           # conversion dictionary
    = None use_unicode,    # whether unicode encoding 
    of client_flag = 0,       # the Custom Send to the flags to the MySQL. constants.CLIENT in the Find potential values. 
    cursorClass = < class  ' pymysql.cursors.Cursor ' >, # select Cursor Type 
    init_command = None,   # connection established at runtime during initial statement 
    connect_timeout the = 10, # connection time, (default: 10, min:. 1, max: 31536000) 
    SSL = None,            # a dict of arguments Similar to mysql_ssl_set () 'S parameters.For now and the cipher keyword arguments The capath are at The not Supported. 
    read_default_group = None, #Group to the Read from in at The the Configuration File. 
    The compress = None,       # does not support 
    named_pipe = None,     # does not support 
    no_delay = None,       #  
    autocommit = False,    # whether to automatically submit the transaction 
    db = None,             # the same database, for compatibility MySQLdb 
    passwd = none,         # with the password, to be compatible MySQLdb 
    local_infile = False, # whether to allow load local files 
    max_allowed_packet = 16777216, # restrictions `lOCAL DATA INFILE` size 
    defer_connect = False, # the Do not Explicitly Connect ON Contruction - the wait for Connect Call. 
    auth_plugin_map = {},#
    read_timeout=None,  # 
    write_timeout=None, 
    bind_address = None    # when a customer has multiple network interfaces, specify a connection to the host

 

 

------Query data

import  pymysql

dbinfo={"host":"192.168.6.41",
        "user":"lrtsaudio",
        "password":"2&Ty3DW75i!(vgo.l3Odp1fgWgEG",
        "db":"audiobook"
}

sql1="SELECT book_id,book_name FROM t_book WHERE market_rule=1"
sql2="SELECT * FROM audiobook.w_activity_ticket_3 WHERE user_id=234739503"
connect1=pymysql.connect(**dbinfo)
cursor1=connect1.cursor()
cursor1.execute (SQL1)   # return value is the number of rows is not affected, as follows: 
"" "
num=cursor1.execute(sql1)
print (num) # Results: num = 8
"" " 
R_all = cursor1.fetchall () # remove all the query results 
r_one cursor1.fetchone = () # fetches a row query results taken from the first row starts 
r_many = cursor1.fetchmany (size = 2) # remove lines wherein the query The results 
Print (r_all)
 Print (r_one)
 Print (r_many)

cursor1.close()
connect1.close()

Comment out the code fetchall result of:

! ! ! In other words:

When such fetchall (), fetchmany (), fetchone () acting simultaneously on the same query, performed at the beginning of the end of each method is a method performed