spring boot 初始化mongodb

电玩女神 2024-02-18 17:56 80阅读 0赞

**方法一：springboot自动配置了支持mongodb。在启动springboot时会自动实例化一个mongo实例。可以在application.yml配置。**

**方法二：把配置连接信息存在数据库从数据库获取，项目启动时初始化。**

**用的到包：**

**  
<dependency>  
<groupId>org.springframework.boot</groupId>  
<artifactId>spring-boot-starter-data-mongodb</artifactId>  
</dependency>**

**Java代码：**

@Resource  
private ConfigDao configDao;  
@Bean  
public MongoTemplate mongoTemplate() throws Exception \{

//从数据库取连接信息

Config configs = configDao.getConfigs("MONGO");  
String host = configs.getHost();  
int port = configs.getPort();  
String userName = configs.getUserName();  
String password = configs.getPassword();  
String databaseName = configs.getDatabaseName();  
  
// 权限验证 MongoCredential  
MongoCredential credential = MongoCredential.createScramSha1Credential(  
userName,  databaseName, password.toCharArray());  
ServerAddress serverAddress = new ServerAddress(host, port);  
MongoClient mongoClient = new MongoClient(serverAddress,  
Arrays.asList(credential));  
SimpleMongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(  
mongoClient,  databaseName);  
DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);  
MappingMongoConverter converter = new MappingMongoConverter(  
dbRefResolver, new MongoMappingContext());  
// 不插入\_class  
converter.setTypeMapper(new DefaultMongoTypeMapper(null));  
MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory,  
converter);  
// 验证是否成功  
// HqmgUser我定义的实体类  
HqmgUser us = new HqmgUser();  
us.setMgoid("o1000");  
us.setConsumerid("10000001");  
us.setName("行哥");  
us.setPhone("1828888888");  
us.setCreatetime(new Date().toString());  
// 插入方法  
mongoTemplate.insert(us, "t\_user");  
// 查询方法  
QueryBuilder queryBuilder = new QueryBuilder();  
queryBuilder.and("mgoid").is("o1000");  
HqmgUser findOne = mongoTemplate.findOne(  
new BasicQuery(queryBuilder.get()), HqmgUser.class, "t\_user");  
String name = findOne.getName();  
System.out.println("name==============>"+name);  
return mongoTemplate;  
\}

使用方法：注入mongoTemplate就可以直接调用方法了。如下：

@Resource  
private MongoTemplate mongoTemplate;

//通过mgoid查询  
public HqmgUser findHqmgUserById(查询条件,表名) \{  
QueryBuilder queryBuilder = new QueryBuilder();  
queryBuilder.and("mgoid").is(查询条件);  
return mongoTemplate.findOne(new BasicQuery(queryBuilder.get()), HqmgUser.class, 表名);  
\}

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