1.pymysql安裝
pip install pymysql
(測試連接:import pymysql,如編譯未出錯,即表示pymysql安裝成功)
2.插入操作
import pymysql
db=pymysql.connect(host="127.0.0.1",user="root",password="ts123456",db="blog_spider",port=3307)
# 使用cursor()方法獲取操作遊標
cur = db.cursor()
sql_insert ="""insert into user(id,username,password) values(4,'gaoyp','1234')"""
try:
cur.execute(sql_insert)
#提交
db.commit()
except Exception as e:
#錯誤回滾
db.rollback()
finally:
db.close()
3.查詢操作
import pymysql
#打開數據庫連接
conn=pymysql.connect(host="127.0.0.1",user="root",password="ts123456",db="blog_spider",port=3307)
# 使用cursor()方法獲取操作遊標
cur = db.cursor()
#1.查詢操作
# 編寫sql 查詢語句 user 對應我的表名
sql = "select * from user"
try:
cur.execute(sql) #執行sql語句
results = cur.fetchall() #獲取查詢的所有記錄
print("id","name","password")
#遍歷結果
for row in results :
id = row[0]
name = row[1]
password = row[2]
print(id,name,password)
except Exception as e:
raise e
finally:
db.close() #關閉連接
4.更新操作
sql_update ="update user set username = '%s' where id = %d"
try:
cur.execute(sql_update % ("mata.gao",3)) #像sql語句傳遞參數
#提交
db.commit()
except Exception as e:
#錯誤回滾
db.rollback()
finally:
db.close()
5.刪除操作
sql_delete ="delete from user where id = %d"
try:
cur.execute(sql_delete % (3)) #像sql語句傳遞參數
#提交
db.commit()
except Exception as e:
#錯誤回滾
db.rollback()
finally:
db.close()