mongo 学习日志（一）插入数据

1. 插入数据
   

   		String firstName = RandomStringUtils.randomAlphabetic(7);
   		String lastName = RandomStringUtils.randomAlphabetic(7);
   		Customer customer = new Customer(firstName, lastName);
   		mongoTemplate.save(customer);

   Customer.java
   

   package com.demo.entity;
   
   import org.springframework.data.annotation.Id;
   import org.springframework.data.mongodb.core.mapping.Document;
   
   @Document(collection = "Customer")
   public class Customer {
   	@Id
   	private String id;
   	
   	private String firstName;
   	private String lastName;
   
   	public Customer() {
   	}
   
   	public Customer(String firstName, String lastName) {
   		this.firstName = firstName;
   		this.lastName = lastName;
   	}
   
   	@Override
   	public String toString() {
   		return String.format("Customer[id=%s, firstName='%s', lastName='%s']",
   				id, firstName, lastName);
   	}
   }
   

   插入结果
   
   NOTE: 插入结果中多了一列_class.
   

   解决

   <mongo:mongo host="127.0.0.1" port="27017"/>
   <mongo:db-factory dbname="database" mongo-ref="mongo"/>
   
   <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
       <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
       <!-- <constructor-arg name="mongoConverter" ref="mappingConverter" /> -->
   </bean>

   查了查资料，发现如果使用默认配置，数据库里面将会添加 “_class”.更改为如下配置后,“_class”被移除。
   

   <!-- Default bean name is 'mongo' -->
   <mongo:mongo host="localhost" port="27017"/>
   <mongo:db-factory dbname="database"/>
   
   <bean id="mappingContext"
    class="org.springframework.data.mongodb.core.mapping.MongoMappingContext"/>
   
   <bean id="defaultMongoTypeMapper"
    class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
       <constructor-arg name="typeKey">
           <null/>
       </constructor-arg>
   </bean>
   
   <bean id="mappingMongoConverter"
    class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
       <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
       <constructor-arg name="mappingContext" ref="mappingContext"/>
       <property name="typeMapper" ref="defaultMongoTypeMapper"/>
   </bean>
   
   <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
       <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
       <constructor-arg name="mongoConverter" ref="mappingMongoConverter"/>
   </bean>

   参考
   
   1. http://www.mkyong.com/mongodb/spring-data-mongodb-remove-_class-column/
   2. http://stackoverflow.com/questions/6810488/spring-data-mongodb-mappingmongoconverter-remove-class