有哪些建站的公司,上海包装设计公司,投资公司名字大全集,网站打开的速度特别慢的原因连接mysql数据库测试(专业版)
[注意1#xff1a;要导入text库#xff0c;否则可能出现找不到select 1错误]
[注意2#xff1a;若出现下列问题#xff0c;可按照模板代码的顺序db SQLAlchemy(app) 的位置] RuntimeError: Either SQLALCHEMY_DATABASE_URI or SQLALCHEMY_B…连接mysql数据库测试(专业版)
[注意1要导入text库否则可能出现找不到select 1错误]
[注意2若出现下列问题可按照模板代码的顺序db SQLAlchemy(app) 的位置] RuntimeError: Either SQLALCHEMY_DATABASE_URI or SQLALCHEMY_BINDS must be set. from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import text
app Flask(__name__)# MySQL所在主机名默认127.0.0.1
HOSTNAME 127.0.0.1
PORT 3306
USERNAME root
PASSWORD ****
DATABASE ***
app.config[SQLALCHEMY_DATABASE_URI] fmysqlpymysql://{USERNAME}:{PASSWORD}{HOSTNAME}:{PORT}/{DATABASE}?charsetutf8db SQLAlchemy(app)with app.app_context():with db.engine.connect() as conn:result conn.execute(text(select 1))print(result.fetchone()) # (1,)
ORM的实现
class User(db.Model):__tablename adminid db.Column(db.Integer,primary_keyTrue,autoincrementTrue)sname db.Column(db.String(100),nullableFalse)snumber db.Column(db.String(100),nullableFalse)address db.Column(db.String(100),nullableFalse)with app.app_context():db.create_all()命令行的实现及结果 mysql show tables; --------------- | Tables_in_flk | --------------- | admin | | user | --------------- 2 rows in set (0.00 sec) mysql desc admin; ----------------------------------------------------------- | Field | Type | Null | Key | Default | Extra | ----------------------------------------------------------- | id | int | NO | PRI | NULL | auto_increment | | sname | varchar(100) | NO | | NULL | | | snumber | varchar(100) | NO | | NULL | | | address | varchar(100) | NO | | NULL | | ----------------------------------------------------------- 4 rows in set (0.00 sec) ORM插入实现
user User(snamepass, snumber10, address163qq.com)
db.session.add(user)
db.session.commit()
mysql select * from admin;
--------------------------------
| id | sname | snumber | address |
--------------------------------
| 1 | pass | 10 | 163qq.com |
--------------------------------
1 row in set (0.00 sec) ORM查询实现
user User.query.get(1)
print(user.sname)
# 输出 pass
ORM筛选实现
user User.query.filter_by(snamepass)
print(user[0].address)
# 输出 163qq.com
ORM更新实现
user User.query.filter_by(snamepass).first()
user.address 666qq.com
db.session.commit() ORM删除实现
user User.query.get(1)
db.session.delete(user)
db.session.commit()
其他待更新中。。。
