sqlalchemy操作mysql
#coding=utf-8
from sqlalchemy import Column, String, create_engine, ForeignKey
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.ext.declarative import declarative_base
engine = create_engine('mysql+pymysql://root:@192.168.43.136:3306/uic',
echo=False)
conn = engine.connect()
result = conn.execute("select * from user;")
# print result.fetchall()
Base = declarative_base()
class Muser(Base):
__tablename__ = "user3"
id = Column(String(20),primary_key=True)
name = Column(String(20))
class Student(Base):
__tablename__ = 'student'
id = Column(String(20), primary_key=True)
name = Column(String(20))
books = relationship('Book')
class Book(Base):
__tablename__ = 'book'
id = Column(String(20), primary_key=True)
name = Column(String(20))
user_id = Column(String(20), ForeignKey('student.id'))
Base.metadata.create_all(engine)
DBSession = sessionmaker(bind=engine)
session = DBSession()
# new_user = Muser(id='8', name='bob')
# session.add(new_user)
# session.commit()
# session.close()
user = session.query(Muser).filter(Muser.id=='5').one()
print user.id,user.name联结查询
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student right join book on student.id=book.user_id;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| sudent1 | book1 |
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
+--------------+--------+
6 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student right join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| NULL | book1 |
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
+--------------+--------+
6 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student left join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| sudent1 | NULL |
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
| student3 | NULL |
| bob | NULL |
+--------------+--------+
8 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
+--------------+--------+
5 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student inner join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
+--------------+--------+
5 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student outer join book on student.id=book.user_id and student.id=2;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'outer join book on student.id=book.user_id and student.id=2' at line 1
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student left outer join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| sudent1 | NULL |
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
| student3 | NULL |
| bob | NULL |
+--------------+--------+
8 rows in set (0.00 sec)
MariaDB [uic]> select student.name "学生姓名",book.name "书名" from student right outer join book on student.id=book.user_id and student.id=2;
+--------------+--------+
| 学生姓名 | 书名 |
+--------------+--------+
| NULL | book1 |
| student2 | book2 |
| student2 | book3 |
| student2 | book4 |
| student2 | book5 |
| student2 | book2 |
+--------------+--------+
6 rows in set (0.00 sec)
https://blog.csdn.net/u011573853/article/details/51355113?utm_source=blogxgwz0
出处：https://zm10.sm-tc.cn/
openfalcon alarm-db-schema.sql
CREATE DATABASE alarms
DEFAULT CHARACTER SET utf8
DEFAULT COLLATE utf8_general_ci;
USE alarms;
SET NAMES utf8;
/*
* 建立告警归档资料表, 主要存储各个告警的最后触发状况
*/
DROP TABLE IF EXISTS event_cases;
CREATE TABLE IF NOT EXISTS event_cases(
id VARCHAR(50),
endpoint VARCHAR(100) NOT NULL,
metric VARCHAR(200) NOT NULL,
func VARCHAR(50),
cond VARCHAR(200) NOT NULL,
note VARCHAR(500),
max_step int(10) unsigned,
current_step int(10) unsigned,
priority INT(6) NOT NULL,
status VARCHAR(20) NOT NULL,
timestamp Timestamp NOT NULL,
update_at Timestamp NULL DEFAULT NULL,
closed_at Timestamp NULL DEFAULT NULL,
closed_note VARCHAR(250),
user_modified int(10) unsigned,
tpl_creator VARCHAR(64),
expression_id int(10) unsigned,
strategy_id int(10) unsigned,
template_id int(10) unsigned,
process_note MEDIUMINT,
process_status VARCHAR(20) DEFAULT 'unresolved',
PRIMARY KEY (id),
INDEX (endpoint, strategy_id, template_id)
)
ENGINE =InnoDB
DEFAULT CHARSET =utf8;
/*
* 建立告警归档资料表, 存储各个告警触发状况的历史状态
*/
DROP TABLE IF EXISTS events;
CREATE TABLE IF NOT EXISTS events (
id int(10) NOT NULL AUTO_INCREMENT,
event_caseId VARCHAR(50),
step int(10) unsigned,
cond VARCHAR(200) NOT NULL,
status int(3) unsigned DEFAULT 0,
timestamp Timestamp,
PRIMARY KEY (id),
INDEX(event_caseId),
FOREIGN KEY (event_caseId) REFERENCES event_cases(id)
ON DELETE CASCADE
ON UPDATE CASCADE
)
ENGINE =InnoDB
DEFAULT CHARSET =utf8;
/*
* 告警留言表
*/
CREATE TABLE IF NOT EXISTS event_note (
id MEDIUMINT NOT NULL AUTO_INCREMENT,
event_caseId VARCHAR(50),
note VARCHAR(300),
case_id VARCHAR(20),
status VARCHAR(15),
timestamp Timestamp,
user_id int(10) unsigned,
PRIMARY KEY (id),
INDEX (event_caseId),
FOREIGN KEY (event_caseId) REFERENCES event_cases(id)
ON DELETE CASCADE
ON UPDATE CASCADE,
FOREIGN KEY (user_id) REFERENCES uic.user(id)
ON DELETE CASCADE
ON UPDATE CASCADE
);