python sqlalchemy操作mysql数据库（ORM方式）

查询

使用sql语句查询：

from urllib import parse
from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData

con = create_engine('mysql+pymysql://root:root@localhost:3306/testdb?charset=utf8')  
# pd.read_sql(sql,con) 

result = con.execute("SELECT * FROM testtable")

# 处理查询结果
for row in result:
    print(row)
con.dispose()

使用ORM方式查询：

from urllib import parse
from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData

metadata = MetaData()
employees = Table('testtable', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('email', String),
)

engine  = create_engine('mysql+pymysql://root:root@localhost:3306/testdb?charset=utf8')  
# pd.read_sql(sql,con) 

s = employees.select()

conn = engine.connect()
result = conn.execute(s)

# 处理查询结果
for row in result:
    print(row)

conn.close()
engine.dispose()

插入：

from urllib import parse
from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData

metadata = MetaData()
employees = Table('testtable', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('email', String),
)

engine  = create_engine('mysql+pymysql://root:root@localhost:3306/testdb?charset=utf8')  
# pd.read_sql(sql,con) 

ins = employees.insert().values(id=11, name="nameereee", email="kkkkkkkkkk")

# 执行插入语句
conn = engine.connect()
conn.execute(ins)

# 关闭连接
conn.close()
engine.dispose()

删除：

from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String
engine  = create_engine('mysql+pymysql://root:root@localhost:3306/testdb?charset=utf8')  

metadata = MetaData()
employees = Table('testtable', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('email', String),
)

conn = engine.connect()
stmt = employees.delete().where(employees.c.name == 'nameereee')
conn.execute(stmt)

s = employees.select()
conn.execute(s).fetchall()

更新：

from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String
engine  = create_engine('mysql+pymysql://root:root@localhost:3306/testdb?charset=utf8')  

metadata = MetaData()
employees = Table('testtable', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('email', String),
)

conn = engine.connect()
stmt=employees.update().where(employees.c.id=='3').values(name='Kapoor')
conn.execute(stmt)

s = employees.select()
conn.execute(s).fetchall()