python mysql 示例

#!/usr/bin/python3

import pymysql

# 打开数据库连接
db = pymysql.connect("localhost", "root", "123456", "test")

# 使用 cursor() 方法创建一个游标对象 cursor
cursor = db.cursor()

# 使用 execute()  方法执行 SQL 查询
cursor.execute("SELECT VERSION()")

# 使用 fetchone() 方法获取单条数据.
data = cursor.fetchone()

print("Database version : %s " % data)

# 使用预处理语句创建表
# sql = """CREATE TABLE EMPLOYEE (
#          FIRST_NAME  CHAR(20) NOT NULL,
#          LAST_NAME  CHAR(20),
#          AGE INT,
#          SEX CHAR(1),
#          INCOME FLOAT )"""
#
# cursor.execute(sql)

# # SQL 插入语句
# sql = """INSERT INTO EMPLOYEE(FIRST_NAME,
#          LAST_NAME, AGE, SEX, INCOME)
#          VALUES ('Mac1', 'Mohan', 20, 'M', 2000)"""
#
# sql2 = """INSERT INTO EMPLOYEE(FIRST_NAME,
#          LAST_NAME, AGE, SEX, INCOME)
#          VALUES ('Mac2', 'Mohan', 20, 'M', 2000)"""
# try:
#    # 执行sql语句
#    cursor.execute(sql)
#    cursor.execute(sql2)
#    # 提交到数据库执行
#    db.commit()
# except:
#    # 如果发生错误则回滚
#    db.rollback()


# SQL 查询语句
sql = "SELECT * FROM EMPLOYEE WHERE FIRST_NAME='Mac'"
try:
   # 执行SQL语句
   cursor.execute(sql)
   # 获取所有记录列表
   results = cursor.fetchall()
   # results = cursor.fetchone()
   print(results)
   for row in results:
        print(row)
        fname = row[0]
        lname = row[1]
        age = row[2]
        sex = row[3]
        income = row[4]
        # 打印结果
        print ("fname=%s,lname=%s,age=%d,sex=%s,income=%d" % \
             (fname, lname, age, sex, income ))
except:
   print ("Error: unable to fetch data")



# 关闭数据库连接
db.close()