文章目录
- 九、数据库与Python交互
- 1.连接MYSQL数据库
- 1.1.创建表
- 1.2.插入数据
- 1.3.查询数据
- 1.4.更新数据
- 1.5.删除数据
- 1.6.执行事务
- 1.7.读取数据库表数据并写入excel
- 1.8.读取excel数据并写入数据库表
- 2.Python人机交互(Tkinter图形界面开发)
- 2.1.创建root窗口
- 2.2.控件布局
- 2.3.实现commend
- 2.4.简单测试案例
引用自 https://www.runoob.com/python3/python3-mysql.html
九、数据库与Python交互
1.连接MYSQL数据库
1.1.创建表
import pymysql
# 打开数据库连接
db = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
# 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,如果表存在则删除
cursor.execute("DROP TABLE IF EXISTS EMPLOYEE")
# 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)
# 关闭数据库连接
db.close()
1.2.插入数据
import pymysql
# 打开数据库连接
db = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
# 使用cursor()方法获取操作游标
cursor = db.cursor()
# SQL 插入语句
sql = """INSERT INTO EMPLOYEE(FIRST_NAME,
LAST_NAME, AGE, SEX, INCOME)
VALUES ('Mac', 'Mohan', 20, 'M', 2000)"""
# SQL 插入语句2
sql2 = "INSERT INTO EMPLOYEE(FIRST_NAME, \
LAST_NAME, AGE, SEX, INCOME) \
VALUES ('%s', '%s', %s, '%s', %s)" % \
('Mac', 'Mohan', 20, 'M', 2000)
try:
# 执行sql语句
cursor.execute(sql)
# 提交到数据库执行
db.commit()
except:
# 如果发生错误则回滚
db.rollback()
# 关闭数据库连接
db.close()
1.3.查询数据
import pymysql
# 打开数据库连接
db = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
# 使用cursor()方法获取操作游标
cursor = db.cursor()
# SQL 查询语句
sql = "SELECT * FROM EMPLOYEE \
WHERE INCOME > %s" % (1000)
try:
# 执行SQL语句
cursor.execute(sql)
# 获取所有记录列表
results = cursor.fetchall()
for row in results:
fname = row[0]
lname = row[1]
age = row[2]
sex = row[3]
income = row[4]
# 打印结果
print ("fname=%s,lname=%s,age=%s,sex=%s,income=%s" % \
(fname, lname, age, sex, income ))
except:
print ("Error: unable to fetch data")
# 关闭数据库连接
db.close()
1.4.更新数据
import pymysql
# 打开数据库连接
db = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
# 使用cursor()方法获取操作游标
cursor = db.cursor()
# SQL 更新语句
sql = "UPDATE EMPLOYEE SET AGE = AGE + 1 WHERE SEX = '%c'" % ('M')
try:
# 执行SQL语句
cursor.execute(sql)
# 提交到数据库执行
db.commit()
except:
# 发生错误时回滚
db.rollback()
# 关闭数据库连接
db.close()
1.5.删除数据
import pymysql
# 打开数据库连接
db = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
# 使用cursor()方法获取操作游标
cursor = db.cursor()
# SQL 删除语句
sql = "DELETE FROM EMPLOYEE WHERE AGE > %s" % (20)
try:
# 执行SQL语句
cursor.execute(sql)
# 提交修改
db.commit()
except:
# 发生错误时回滚
db.rollback()
# 关闭连接
db.close()
1.6.执行事务
# SQL删除记录语句
sql = "DELETE FROM EMPLOYEE WHERE AGE > %s" % (20)
try:
# 执行SQL语句
cursor.execute(sql)
# 向数据库提交
db.commit()
except:
# 发生错误时回滚
db.rollback()
1.7.读取数据库表数据并写入excel
import pymysql,xlwt
def export_excel(table_name):
conn = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
cur = conn.cursor()
sql = 'select * from %s;' %table_name
#读取数据
cur.execute(sql)
fileds = [filed[0] for filed in cur.description]
#所有数据
all_date = cur.fetchall()
for result in all_date:
print(result)
#写excel
book = xlwt.Workbook() #创建一个book
sheet = book.add_sheet('result') #创建一个sheet表
for col,filed in enumerate(fileds):
sheet.write(0,col,filed)
#从第一行开始写
row = 1
for data in all_date:
for col,filed in enumerate(data):
sheet.write(row,col,filed)
row += 1
book.save('%s.xls' %table_name)
pass
export_excel('stocks')
1.8.读取excel数据并写入数据库表
import pymysql
import xlrd
conn = pymysql.connect("数据库IP地址","用户名","密码","数据库" )
cursor = conn .cursor()
#读取excel数据写入数据库
book = xlrd.open_workbook("students.xls")
sheet = book.sheet_by_name('Sheet1')
query = 'insert into student_tbl (name, sex, minzu, danwei_zhiwu, phone_number, home_number) values (%s, %s, %s, %s, %s, %s)'
for r in range(1, sheet.nrows):
name = sheet.cell(r,0).value
sex = sheet.cell(r,1).value
minzu = sheet.cell(r,2).value
danwei_zhiwu = sheet.cell(r,3).value
phone_number = sheet.cell(r,4).value
home_number = sheet.cell(r,5).value
values = (name, sex, minzu, danwei_zhiwu, phone_number, home_number)
# 执行sql语句
# 往SQL添加一条数据
cursor.execute(query , values)
print(values)
cursor.close()
db.commit()
db.close()
2.Python人机交互(Tkinter图形界面开发)
2.1.创建root窗口
#导入Tkinter包全部内容
from tkinter import *
#Tkinter根窗口实例化
root = Tk()
#设置窗口标题
root.title("my_Title")
2.2.控件布局
#设置label控件
label1 = Label(root,text = 'Number:')
label1.grid(row = 0, column = 0)
#设置text控件
text1 = Text(root,width = 30 , height = 1)
text1.grid(row = 1, column = 0)
2.3.实现commend
#设置调用函数
def myCalculate():
a = int(text1.get("1.0",END))#从头开始取到结尾
sum = a * 3
text2.delete('1.0',END)
text2.insert(INSERT,sum)
pass
#设置Button
button = Button(root,text="click sum",command = myCalculate)
button.grid(row = 4, column = 0)
2.4.简单测试案例
#导入Tkinter包全部内容
from tkinter import *
#Tkinter根窗口实例化
root = Tk()
#设置窗口标题
root.title("my_Title")
#设置label控件
label1 = Label(root,text = 'Number:')
label1.grid(row = 0, column = 0)
#设置text控件
text1 = Text(root,width = 30 , height = 1)
text1.grid(row = 1, column = 0)
#设置label控件
label2 = Label(root,text = 'Sum:')
label2.grid(row = 2, column = 0)
#设置text控件
text2 = Text(root,width = 30 , height = 1)
text2.grid(row = 3, column = 0)
#设置调用函数
def myCalculate():
a = int(text1.get("1.0",END))#从头开始取到结尾
sum = a * 3
text2.delete('1.0',END)
text2.insert(INSERT,sum)
pass
#设置Button
button = Button(root,text="click sum",command = myCalculate)
button.grid(row = 4, column = 0)
mainloop()