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 
spring-data-mongodb 使用笔记 - yourwafer - 巍巍的博客

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