Python Operation MySQL

Pymysql

Need to install the Pymysql module to use MySQL in Python

Installation

PIP3 Install Pymysql

If the installation fails, you need to upgrade the PIP version

python-m pip Install--upgrade pip

Use

1. Execute MySQL

1 Import Pymysql2   3 # Create a connection4Conn=Pymysql.connect (Host='127.0.0.1', Port=3306,User='Root', passwd='123'Db='T1')5 # Create Cursors6 cursor =Conn.cursor()7   8 # Executes SQL and returns the number of affected rows Effect_row printable9Effect_row= cursor.Execute("UpdateHostsSetHost= '1.1.1.2'")Ten    One # Executes SQL and returns the number of rows affected A# Effect_row= cursor.Execute("UpdateHostsSetHost= '1.1.1.2' whereNid> %S ", (1,)) -    - # Executes SQL and returns the number of rows affected the# Effect_row= cursor. Executemany ("Insert  intoHosts (HOST,COLOR_ID)Values(%S%s) ",[("1.1.1.11", 1), ("1.1.1.11", 2)]) -    -    - # Commit, or you cannot save new or modified data +Conn.Commit() -    + # Close Cursors A cursor.Close() at # Close Connection -Conn.Close()

2. Get the newly created data self-increment ID

Add multiple Data using Executemany () data should be a tuple in a list/tuple, such as [(), (), ()]

Self-increment ID:cursor.lastrowid

1 Import Pymysql2   3Conn=Pymysql.connect (Host='127.0.0.1', Port=3306,User='Root', passwd='123'Db='T1')4 cursor =Conn.cursor()5 cursor. Executemany ("Insert  intoHosts (HOST,COLOR_ID)Values(%S%s) ",[("1.1.1.11", 1), ("1.1.1.11", 2)])6Conn.Commit()7 cursor.Close()8Conn.Close()9   Ten # Get the latest self-increment ID Onenew_id= cursor. lastrowid

3. Get Query data

1 Import Pymysql2   3Conn=Pymysql.connect (Host='127.0.0.1', Port=3306,User='Root', passwd='123'Db='T1')4 cursor =Conn.cursor()5 cursor.Execute("Select *  fromhosts ")6   7 # Get the first row of data8Row_1= cursor. Fetchone ()9   Ten # Get top N rows of data One# row_2= cursor. Fetchmany (3) A # Get all the data -# Row_3= cursor. Fetchall () -    theConn.Commit() - cursor.Close() -Conn.Close()

Note: In order to fetch data, you can use Cursor.scroll (num, mode) to move the cursor position

• Cursor.scroll (1,mode= ' relative ') # moves relative to the current position
• Cursor.scroll (2,mode= ' absolute ') # relative absolute position movement

4. Fench Data type

The data obtained by default is a tuple type, and the cursor is set to the dictionary type if you want the dictionary type

1 Import Pymysql2   3Conn=Pymysql.connect (Host='127.0.0.1', Port=3306,User='Root', passwd='123'Db='T1')4   5 # Cursor set to dictionary type6 cursor =Conn.cursor(cursor=pymysql.cursors.DictCursor)7R= cursor.Execute("Call P1 ()")8   9Result= cursor. Fetchone ()Ten    OneConn.Commit() A cursor.Close() -Conn.Close()

Python Operation MySQL