python怎么通過(guò)pymysql實(shí)現(xiàn)增刪改查的操作？

# 獲取數(shù)據(jù)庫(kù)連接對(duì)象
connection = pymysql.connect(host='localhost', port=3306, user='root', passwd='2732195202', db='book', charset='utf8')
# 獲取一個(gè)游標(biāo)
driver = connection.cursor()
# 執(zhí)行一條sql
driver.execute("select version()")
# 獲取執(zhí)行sql的返回值
resultData=driver.fetchall()
print(resultData)

# 關(guān)閉數(shù)據(jù)庫(kù)
connection.close()

import pymysql

#獲取數(shù)據(jù)庫(kù)連接對(duì)象
connection = pymysql.connect(host='localhost', port=3306, user='root', passwd='2732195202', db='book', charset='utf8')
#獲取一個(gè)游標(biāo)
driver=connection.cursor()
# 如果該數(shù)據(jù)庫(kù)存在就刪除
driver.execute("drop table if exists t_emp ")
# 定義sql語(yǔ)句
sql=""" CREATE TABLE `t_emp` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵',
  `department` varchar(20) DEFAULT NULL COMMENT '部門(mén)',
  `salary` decimal(10,2) DEFAULT NULL COMMENT '工資',
  `age` int(11) DEFAULT NULL COMMENT '年齡',
  `sex` varchar(4) DEFAULT NULL COMMENT '性別',
  PRIMARY KEY (`id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8; 
    
"""
# 執(zhí)行sql
driver.execute(sql)

# 關(guān)閉數(shù)據(jù)連接
connection.close()

# 獲取數(shù)據(jù)庫(kù)連接對(duì)象
connection=pymysql.connect(host='localhost',port=3306,user='root',passwd='2732195202',db='book',charset='utf8')

# 獲取一個(gè)游標(biāo)
driver=connection.cursor()

# 定義sql語(yǔ)句
sql=""" insert into t_emp(name,department,salary,age,sex)
        values("tom","開(kāi)發(fā)部",8000,25,"男"), ("tom","開(kāi)發(fā)部",8000,25,"男")
 
 """

# 嘗試捕捉錯(cuò)誤
try:
    # 執(zhí)行SQL，并返回收影響行數(shù)
    result=driver.execute(sql)
    # 提交事務(wù)
    connection.commit()
    print("sql(insert)->error")
except:
    # 如果發(fā)生錯(cuò)誤 則回滾事務(wù)
    print("sql(insert)->error")
    driver.rollback()
# 關(guān)閉數(shù)據(jù)庫(kù)連接
connection.close()

#獲取數(shù)據(jù)庫(kù)連接對(duì)象 autocommit=True：設(shè)置數(shù)據(jù)庫(kù)自動(dòng)提交
connection=pymysql.connect(host="localhost",port=3306,user='root',passwd='2732195202',db='book',charset='utf8',autocommit=True)
# 獲取游標(biāo)對(duì)象
driver=connection.cursor()
# 定義sql
sql="update t_emp set salary=%s,name=%s where id=%s;"
# 如果sql錯(cuò)誤就執(zhí)行回滾操作，成功就提交
try:
    # 執(zhí)行sql，并且返回影響的行數(shù)
    result=driver.execute(sql,[6000,"admin",19])
    connection.commit()
    print("sql（update）->success")
except:
    print("sql(update)->error")
    connection.rollback()

# 關(guān)閉數(shù)據(jù)庫(kù)連接對(duì)象
connection.close()

# 獲取數(shù)據(jù)庫(kù)連接對(duì)象
connection=pymysql.connect(host='localhost',port=3306,user='root',passwd='2732195202',db='book',charset='utf8')
# 獲取一個(gè)游標(biāo)對(duì)象
driver=connection.cursor()
#定義sql
sql="select id, name, department, salary, age, sex from t_emp where id>%s and sex=%s"

# 只能獲取一次，獲取多次的時(shí)候會(huì)獲取到null 如果是多個(gè)參數(shù)，需要傳遞一個(gè)元組
try:
    driver.execute(sql,(1,"女"))
    # 獲取所有的查詢結(jié)果 返回一個(gè)元組
    resultAll=driver.fetchall()
    print("resultAll:", resultAll)
    # 獲取2條數(shù)據(jù)
    resultTwo=driver.fetchmany(2)
    print("resultTwo:", resultTwo)
    # 獲取一條數(shù)據(jù)
    resultOne=driver.fetchone()
    print("resultThree:", resultOne)

    print("sql(select)->success")
except:
    connection.rollback()
    print("sql(select)->error")

# 關(guān)閉數(shù)據(jù)庫(kù)連接
connection.close()

import  pymysql

# 獲取數(shù)據(jù)庫(kù)連接對(duì)象
connection = pymysql.connect(host='localhost', port=3306, user='root', passwd='2732195202', db='book', charset='utf8')
# 獲取一個(gè)游標(biāo)
driver = connection.cursor()
# 定義sql
sql="delete from t_emp where id=%s"

try:
    # 執(zhí)行一條sql
    driver.execute(sql, (21))
    # 提交事務(wù)
    connection.commit()
    print("sql(delete)->success")
except  Exception as e:
    # 回滾事務(wù)
    connection.rollback()
    print("sql(delete)->error")
    print(e)

#關(guān)閉數(shù)據(jù)庫(kù)連接
connection.close()