import pymysqldb_conn = pymysql.connect(host="你的数据库地址",user="用户名",port=3306,password="密码",database="数据库名",charset="utf8")# 得到一个可以执行SQL语句的光标对象
cursor = conn.cursor()  # 执行完毕返回的结果集默认以元组显示
# 得到一个可以执行SQL语句并且将结果作为字典返回的游标
# cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)# 定义要执行的sql语句
sql = """
CREATE TABLE USER1 (
id INT auto_increment PRIMARY KEY ,
name CHAR(10) NOT NULL UNIQUE,
age TINYINT NOT NULL
)ENGINE=innodb DEFAULT CHARSET=utf8;  #注意：charset='utf8' 不能写成utf-8
"""# 执行
res=cursor.execute(sql)
sql = 'select * from user1 where name = %s and age=%d'
name = "zhangchen"
age = 28
# execute函数可以加格式化字符参数
res = cursor.execute(sql, [name, age])
print(res)# 执行结束后要关闭光标和连接
cursor.close()
db_conn.close()

import pymysqlconn = pymysql.connect(host='192.168.0.103',port=3306,user='root',password='123',database='xing',charset='utf8'
)
# 获取一个光标
cursor = conn.cursor()# 定义要执行的sql语句
sql = 'insert into userinfo(name,age) values(%s,%d);'
data = [('july', 14),('june', 25),('marin', 36)
]
# 拼接并执行sql语句
cursor.executemany(sql, data)# 涉及写操作要注意提交
conn.commit()# 关闭连接
cursor.close()
conn.close()

sql ='insert into userinfo (user,pwd) values (%s,%d);'name = 'zhangchen'
pwd = 28
cursor.execute(sql, [name, pwd])
conn.commit()
cursor.close()
conn.close()

# 定义将要执行的SQL语句
sql = "insert into user1 (name, age) values (%s, %d);"
name = "zhangchen"
pwd = 28
# 并执行SQL语句
cursor.execute(sql, [name, age])
# 涉及写操作注意要提交
conn.commit()# 获取最新的那一条数据的ID
last_id = cursor.lastrowid
print("最后一条数据的ID是:", last_id)# 关闭连接
cursor.close()
conn.close()

# 定义将要执行的SQL语句
sql = "delete from user1 where name=%s;"
name = "june"
# 拼接并执行SQL语句
cursor.execute(sql, [name])
# 涉及写操作注意要提交
conn.commit()
# 关闭连接cursor.close()
conn.close()

sql = "update user1 set age=%d where name=%s;"
# 拼接并执行SQL语句
cursor.execute(sql, [18, "zhangchen"])# 涉及写操作注意要提交
conn.commit()# 关闭连接
cursor.close ()
conn.close ()

# 获取一个光标
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)  # 返回字典数据类型# 定义将要执行的sql语句
sql = 'select name,age from user1;'
# 执行sql语句
cursor.execute(sql)# 取到查询结果
ret1 = cursor.fetchone()  # 取一条
ret2 = cursor.fetchmany(3)  # 取三条
ret3 = cursor.fetchone()  # 取一条# 光标按绝对位置移动1
cursor.scroll(1, mode="absolute")
# 光标按照相对位置(当前位置)移动1
cursor.scroll(1, mode="relative")

try:# 拼接并执行SQL语句cursor.execute(sql1, [name, age])print(sql1)cursor.execute(sql2, [id, hobby])  # 报错的SQL语句# 涉及写操作注意要提交conn.commit()
except Exception as e:print(str(e))# 有异常就回滚conn.rollback()# 关闭连接
cursor.close()
conn.close()