from
sqlalchemy
import
*
from
sqlalchemy.orm
import
sessionmaker, relationship
from
sqlalchemy.ext.declarative
import
declarative_base
Base
=
declarative_base()
class
Department(Base):
__tablename__
=
"department"
id
=
Column(Integer, primary_key
=
True
)
name
=
Column(String(
50
))
employees
=
relationship(
'Employee'
)
class
Employee(Base):
__tablename__
=
"employee"
emp_id
=
Column(Integer, primary_key
=
True
)
emp_name
=
Column(String(
50
))
age
=
Column(Integer)
salary
=
Column(DECIMAL)
dep_id
=
Column(Integer, ForeignKey(
"department.id"
))
department
=
relationship(
"Department"
)
Base.metadata.create_all(engine)
Session
=
sessionmaker(bind
=
engine)
session
=
Session()
ece_dep
=
Department(
id
=
1
, name
=
"ECE"
)
cse_dep
=
Department(
id
=
2
, name
=
"CSE"
)
mech_dep
=
Department(
id
=
3
, name
=
"MECH"
)
emp1
=
Employee(emp_id
=
101
, emp_name
=
"Kohli"
, age
=
34
,
salary
=
75000
, dep_id
=
ece_dep.
id
)
emp2
=
Employee(emp_id
=
102
, emp_name
=
"Dhoni"
, age
=
45
,
salary
=
120000
, dep_id
=
ece_dep.
id
)
emp3
=
Employee(emp_id
=
103
, emp_name
=
"Sachine"
, age
=
39
,
salary
=
100000
, dep_id
=
ece_dep.
id
)
emp4
=
Employee(emp_id
=
201
, emp_name
=
"Alice"
, age
=
26
,
salary
=
40000
, dep_id
=
cse_dep.
id
)
emp5
=
Employee(emp_id
=
202
, emp_name
=
"Bob"
, age
=
56
,
salary
=
75000
, dep_id
=
cse_dep.
id
)
emp6
=
Employee(emp_id
=
203
, emp_name
=
"charlie"
, age
=
43
,
salary
=
50000
, dep_id
=
cse_dep.
id
)
emp7
=
Employee(emp_id
=
301
, emp_name
=
"Ronaldo"
, age
=
56
,
salary
=
40000
, dep_id
=
mech_dep.
id
)
emp8
=
Employee(emp_id
=
302
, emp_name
=
"Messi"
, age
=
54
,
salary
=
30000
, dep_id
=
mech_dep.
id
)
emp9
=
Employee(emp_id
=
303
, emp_name
=
"neymar"
, age
=
45
,
salary
=
25000
, dep_id
=
mech_dep.
id
)
session.add_all([ece_dep, cse_dep, mech_dep, emp1, emp2,
emp3, emp4, emp5, emp6, emp7, emp8, emp9])
session.commit()
session.close()