find_by_xx_and_yy method such as:
find_by_xx_and_yy method such as:
ModelA.find_by_name_and_code("jcai","1232")
method name
parameter list
Relation query instance
where method sucha as:
where method sucha as:
find_by(name="jcai",code="1232")
method name
method parameter
relation query object
get model class and primary key
find some records by primary key
find some records by primary key
key array
query object
retrieving single object,must exist
retrieving single object,must exist
primary key
entity object
retrieving single object,may not exist
retrieving single object,may not exist
primary key
entity object
select some fields
select some fields
fields
Select step
where by DSL
where by DSL
select step
whereByJPQL(ql,parameters) ModelA.where("name=?1 and code=?2","jcai","1232")
whereByJPQL(ql,parameters) ModelA.where("name=?1 and code=?2","jcai","1232")
query language
parameters
Realtion Object