spring-data-mongodb必须了解的操作

http://docs.spring.io/spring-data/data-mongo/docs/1.0.0.M5/api/org/springframework/data/mongodb/core/MongoTemplate.html 在线api文档

1关键之识别

Keyword	Sample	Logical result
GreaterThan	findByAgeGreaterThan(int age)	{"age" : {"$gt" : age}}
LessThan	findByAgeLessThan(int age)	{"age" : {"$lt" : age}}
Between	findByAgeBetween(int from, int to)	{"age" : {"$gt" : from, "$lt" : to}}
IsNotNull, NotNull	findByFirstnameNotNull()	{"age" : {"$ne" : null}}
IsNull, Null	findByFirstnameNull()	{"age" : null}
Like	findByFirstnameLike(String name)	{"age" : age} ( age as regex)
Regex	findByFirstnameRegex(String firstname)	{"firstname" : {"$regex" : firstname }}
(No keyword)	findByFirstname(String name)	{"age" : name}
Not	findByFirstnameNot(String name)	{"age" : {"$ne" : name}}
Near	findByLocationNear(Point point)	{"location" : {"$near" : [x,y]}}
Within	findByLocationWithin(Circle circle)	{"location" : {"$within" : {"$center" : [ [x, y], distance]}}}
Within	findByLocationWithin(Box box)	{"location" : {"$within" : {"$box" : [ [x1, y1], x2, y2]}}}True
IsTrue, True	findByActiveIsTrue()	{"active" : true}
IsFalse, False	findByActiveIsFalse()	{"active" : false}
Exists	findByLocationExists(boolean exists)	{"location" : {"$exists" : exists }}

2注解方式

2.1查询所有属性

publicinterfacePersonRepositoryextendsMongoRepository<Person,String>
@Query("{ 'firstname' : ?0 }")
List<Person> findByThePersonsFirstname(String firstname);
}

2.2查询部分属性

publicinterfacePersonRepositoryextendsMongoRepository<Person,String>
@Query(value="{ 'firstname' : ?0 }", fields="{ 'firstname' : 1, 'lastname' : 1}")
List<Person> findByThePersonsFirstname(String firstname);
}

3bean的配置属性

• @Id - 配置id

• @Document  映射到数据库的集合名，可以设置名称

• @DBRef - applied at the field to indicate it is to be stored using a com.mongodb.DBRef.

• @Indexed - applied at the field level to describe how to index the field.

• @CompoundIndex - applied at the type level to declare Compound Indexes

• @GeoSpatialIndexed - applied at the field level to describe how to geoindex the field.

• @Transient - 当有数据部需要保存的时候可以使用

• @PersistenceConstructor - marks a given constructor - even a package protected one - to use when instantiating the object from the database. Constructor arguments are mapped by name to the key values in the retrieved DBObject.

• @Value - this annotation is part of the Spring Framework . Within the mapping framework it can be applied to constructor arguments. This lets you use a Spring Expression Language statement to transform a key's value retrieved in the database before it is used to construct a domain object.

• @Field - 给该属性添加存储在数据库中的名字

  @Document
  @CompoundIndexes({
  @CompoundIndex(name ="age_idx",def="{'lastName': 1, 'age': -1}")
  })

  //上面配置了联合属性lastName和age
  publicclassPerson<T extendsAddress>{
  
  @Id
  privateString id;
  
  @Indexed(unique =true)
  privateInteger ssn;
  
  @Field("fName")
  privateString firstName;
  
  @Indexed
  privateString lastName;
  
  privateInteger age;
  
  @Transient
  privateInteger accountTotal;
  
  @DBRef
  privateList<Account> accounts;
  
  private T address;
  
  
  publicPerson(Integer ssn){
  this.ssn = ssn;
  }
  
  @PersistenceConstructor
  publicPerson(Integer ssn,String firstName,String lastName,Integer age, T address){
  this.ssn = ssn;
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
  this.address = address;
  }
  }

3.2@DBRef使用

使用后如图，不存储对象数据，只存储 集合名和id