文章目錄

• 九、數(shù)據(jù)庫與Python交互
• • 1.連接MYSQL數(shù)據(jù)庫
  • • 1.1.創(chuàng)建表
    • 1.2.插入數(shù)據(jù)
    • 1.3.查詢數(shù)據(jù)
    • 1.4.更新數(shù)據(jù)
    • 1.5.刪除數(shù)據(jù)
    • 1.6.執(zhí)行事務(wù)
    • 1.7.讀取數(shù)據(jù)庫表數(shù)據(jù)并寫入excel
    • 1.8.讀取excel數(shù)據(jù)并寫入數(shù)據(jù)庫表
  • 2.Python人機(jī)交互（Tkinter圖形界面開發(fā)）
  • • 2.1.創(chuàng)建root窗口
    • 2.2.控件布局
    • 2.3.實現(xiàn)commend
    • 2.4.簡單測試案例

引用自 https://www.runoob.com/python3/python3-mysql.html

九、數(shù)據(jù)庫與Python交互

1.連接MYSQL數(shù)據(jù)庫

1.1.創(chuàng)建表

import pymysql # 打開數(shù)據(jù)庫連接 db = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )# 使用 cursor() 方法創(chuàng)建一個游標(biāo)對象 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()

1.2.插入數(shù)據(jù)

import pymysql# 打開數(shù)據(jù)庫連接 db = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )# 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)""" # SQL 插入語句2 sql2 = "INSERT INTO EMPLOYEE(FIRST_NAME, \LAST_NAME, AGE, SEX, INCOME) \VALUES ('%s', '%s', %s, '%s', %s)" % \('Mac', 'Mohan', 20, 'M', 2000) try:# 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)生錯誤則回滾db.rollback()# 關(guān)閉數(shù)據(jù)庫連接 db.close()

1.3.查詢數(shù)據(jù)

import pymysql# 打開數(shù)據(jù)庫連接 db = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )# 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()

1.4.更新數(shù)據(jù)

import pymysql# 打開數(shù)據(jù)庫連接 db = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )# 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)生錯誤時回滾db.rollback()# 關(guān)閉數(shù)據(jù)庫連接 db.close()

1.5.刪除數(shù)據(jù)

import pymysql# 打開數(shù)據(jù)庫連接 db = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )# 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)生錯誤時回滾db.rollback()# 關(guān)閉連接 db.close()

1.6.執(zhí)行事務(wù)

# 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)生錯誤時回滾db.rollback()

1.7.讀取數(shù)據(jù)庫表數(shù)據(jù)并寫入excel

import pymysql,xlwtdef export_excel(table_name):conn = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" )cur = conn.cursor()sql = 'select * from %s;' %table_name#讀取數(shù)據(jù)cur.execute(sql)fileds = [filed[0] for filed in cur.description]#所有數(shù)據(jù)all_date = cur.fetchall() for result in all_date:print(result)#寫excelbook = xlwt.Workbook() #創(chuàng)建一個booksheet = book.add_sheet('result') #創(chuàng)建一個sheet表for col,filed in enumerate(fileds):sheet.write(0,col,filed)#從第一行開始寫row = 1for data in all_date:for col,filed in enumerate(data):sheet.write(row,col,filed)row += 1book.save('%s.xls' %table_name)passexport_excel('stocks')

1.8.讀取excel數(shù)據(jù)并寫入數(shù)據(jù)庫表

import pymysql import xlrd conn = pymysql.connect("數(shù)據(jù)庫IP地址","用戶名","密碼","數(shù)據(jù)庫" ) cursor = conn .cursor()#讀取excel數(shù)據(jù)寫入數(shù)據(jù)庫 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).valuesex = sheet.cell(r,1).valueminzu = sheet.cell(r,2).valuedanwei_zhiwu = sheet.cell(r,3).valuephone_number = sheet.cell(r,4).valuehome_number = sheet.cell(r,5).valuevalues = (name, sex, minzu, danwei_zhiwu, phone_number, home_number)# 執(zhí)行sql語句# 往SQL添加一條數(shù)據(jù)cursor.execute(query , values) print(values) cursor.close() db.commit() db.close()

2.Python人機(jī)交互（Tkinter圖形界面開發(fā)）

2.1.創(chuàng)建root窗口

#導(dǎo)入Tkinter包全部內(nèi)容 from tkinter import * #Tkinter根窗口實例化 root = Tk() #設(shè)置窗口標(biāo)題 root.title("my_Title")

2.2.控件布局

#設(shè)置label控件 label1 = Label(root,text = 'Number:') label1.grid(row = 0, column = 0) #設(shè)置text控件 text1 = Text(root,width = 30 , height = 1) text1.grid(row = 1, column = 0)

2.3.實現(xiàn)commend

#設(shè)置調(diào)用函數(shù) def myCalculate():a = int(text1.get("1.0",END))#從頭開始取到結(jié)尾sum = a * 3text2.delete('1.0',END)text2.insert(INSERT,sum)pass #設(shè)置Button button = Button(root,text="click sum",command = myCalculate) button.grid(row = 4, column = 0)

2.4.簡單測試案例

#導(dǎo)入Tkinter包全部內(nèi)容 from tkinter import * #Tkinter根窗口實例化 root = Tk() #設(shè)置窗口標(biāo)題 root.title("my_Title") #設(shè)置label控件 label1 = Label(root,text = 'Number:') label1.grid(row = 0, column = 0) #設(shè)置text控件 text1 = Text(root,width = 30 , height = 1) text1.grid(row = 1, column = 0) #設(shè)置label控件 label2 = Label(root,text = 'Sum:') label2.grid(row = 2, column = 0) #設(shè)置text控件 text2 = Text(root,width = 30 , height = 1) text2.grid(row = 3, column = 0) #設(shè)置調(diào)用函數(shù) def myCalculate():a = int(text1.get("1.0",END))#從頭開始取到結(jié)尾sum = a * 3text2.delete('1.0',END)text2.insert(INSERT,sum)pass #設(shè)置Button button = Button(root,text="click sum",command = myCalculate) button.grid(row = 4, column = 0)mainloop()

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