Python3 MySQL 數(shù)據(jù)庫連接的使用示例

$ pip3 install PyMySQL

$ git clone https://github.com/PyMySQL/PyMySQL
$ cd PyMySQL/
$ python3 setup.py install

$ # X.X 為 PyMySQL 的版本號(hào)
$ curl -L https://github.com/PyMySQL/PyMySQL/tarball/pymysql-X.X | tar xz
$ cd PyMySQL*
$ python3 setup.py install
$ # 現(xiàn)在你可以刪除 PyMySQL* 目錄

$ wget https://bootstrap.pypa.io/ez_setup.py
$ python3 ez_setup.py

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用 cursor() 方法創(chuàng)建一個(gè)游標(biāo)對(duì)象 cursor
cursor = db.cursor()
 
# 使用 execute()  方法執(zhí)行 SQL 查詢 
cursor.execute("SELECT VERSION()")
 
# 使用 fetchone() 方法獲取單條數(shù)據(jù).
data = cursor.fetchone()
 
print ("Database version : %s " % data)
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用 cursor() 方法創(chuàng)建一個(gè)游標(biāo)對(duì)象 cursor
cursor = db.cursor()
 
# 使用 execute() 方法執(zhí)行 SQL，如果表存在則刪除
cursor.execute("DROP TABLE IF EXISTS EMPLOYEE")
 
# 使用預(yù)處理語句創(chuàng)建表
sql = """CREATE TABLE EMPLOYEE (
         FIRST_NAME  CHAR(20) NOT NULL,
         LAST_NAME  CHAR(20),
         AGE INT,  
         SEX CHAR(1),
         INCOME FLOAT )"""
 
cursor.execute(sql)
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用cursor()方法獲取操作游標(biāo) 
cursor = db.cursor()
 
# SQL 插入語句
sql = """INSERT INTO EMPLOYEE(FIRST_NAME,
         LAST_NAME, AGE, SEX, INCOME)
         VALUES ('Mac', 'Mohan', 20, 'M', 2000)"""
try:
   # 執(zhí)行sql語句
   cursor.execute(sql)
   # 提交到數(shù)據(jù)庫執(zhí)行
   db.commit()
except:
   # 如果發(fā)生錯(cuò)誤則回滾
   db.rollback()
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用cursor()方法獲取操作游標(biāo) 
cursor = db.cursor()
 
# SQL 插入語句
sql = "INSERT INTO EMPLOYEE(FIRST_NAME, \

       LAST_NAME, AGE, SEX, INCOME) \

       VALUES ('%s', '%s',  %s,  '%s',  %s)" % \

       ('Mac', 'Mohan', 20, 'M', 2000)
try:
   # 執(zhí)行sql語句
   cursor.execute(sql)
   # 執(zhí)行sql語句
   db.commit()
except:
   # 發(fā)生錯(cuò)誤時(shí)回滾
   db.rollback()
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

..................................
user_id = "test123"
password = "password"

con.execute('insert into Login values( %s,  %s)' % \

             (user_id, password))
..................................

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用cursor()方法獲取操作游標(biāo) 
cursor = db.cursor()
 
# SQL 查詢語句
sql = "SELECT * FROM EMPLOYEE \

       WHERE INCOME > %s" % (1000)
try:
   # 執(zhí)行SQL語句
   cursor.execute(sql)
   # 獲取所有記錄列表
   results = cursor.fetchall()
   for row in results:
      fname = row[0]
      lname = row[1]
      age = row[2]
      sex = row[3]
      income = row[4]
       # 打印結(jié)果
      print ("fname=%s,lname=%s,age=%s,sex=%s,income=%s" % \

             (fname, lname, age, sex, income ))
except:
   print ("Error: unable to fetch data")
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用cursor()方法獲取操作游標(biāo) 
cursor = db.cursor()
 
# SQL 更新語句
sql = "UPDATE EMPLOYEE SET AGE = AGE + 1 WHERE SEX = '%c'" % ('M')
try:
   # 執(zhí)行SQL語句
   cursor.execute(sql)
   # 提交到數(shù)據(jù)庫執(zhí)行
   db.commit()
except:
   # 發(fā)生錯(cuò)誤時(shí)回滾
   db.rollback()
 
# 關(guān)閉數(shù)據(jù)庫連接
db.close()

#!/usr/bin/python3
 
import pymysql
 
# 打開數(shù)據(jù)庫連接
db = pymysql.connect("localhost","testuser","test123","TESTDB" )
 
# 使用cursor()方法獲取操作游標(biāo) 
cursor = db.cursor()
 
# SQL 刪除語句
sql = "DELETE FROM EMPLOYEE WHERE AGE > %s" % (20)
try:
   # 執(zhí)行SQL語句
   cursor.execute(sql)
   # 提交修改
   db.commit()
except:
   # 發(fā)生錯(cuò)誤時(shí)回滾
   db.rollback()
 
# 關(guān)閉連接
db.close()

# SQL刪除記錄語句
sql = "DELETE FROM EMPLOYEE WHERE AGE > %s" % (20)
try:
   # 執(zhí)行SQL語句
   cursor.execute(sql)
   # 向數(shù)據(jù)庫提交
   db.commit()
except:
   # 發(fā)生錯(cuò)誤時(shí)回滾
   db.rollback()