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[Spring Data MongoDB]学习笔记－－建立数据库的连接

2024-07-16 00:13:06   217人阅读

1. 有了上一篇的Mongo后，连接数据库我们还需要更多的信息，比如数据库名字，用户名和密码等。

我们可以继续来配置MongoDbFactory的实例。

public interface MongoDbFactory {  DB getDb() throws DataAccessException;  DB getDb(String dbName) throws DataAccessException;}

然后我们可以继续用MongoDbFactory来创建MongoTemplate的实例。

public class MongoApp {  private static final Log log = LogFactory.getLog(MongoApp.class);  public static void main(String[] args) throws Exception {    MongoOperations mongoOps = new MongoTemplate(new SimpleMongoDbFactory(new Mongo(), "database"));    mongoOps.insert(new Person("Joe", 34));    log.info(mongoOps.findOne(new Query(where("name").is("Joe")), Person.class));    mongoOps.dropCollection("person");  }}

其中的SimpleMongoDbFactory是MongoDbFactory的实现。

 

2.1 通过Java based metadata来进行配置

@Configurationpublic class MongoConfiguration {    public @Bean MongoDbFactory mongoDbFactory() throws Exception {    return new SimpleMongoDbFactory(new Mongo(), "database");  }}

如果需要认证的话，多加一个参数。

@Configurationpublic class MongoConfiguration {    public @Bean MongoDbFactory mongoDbFactory() throws Exception {    UserCredentials userCredentials = new UserCredentials("joe", "secret");    return new SimpleMongoDbFactory(new Mongo(), "database", userCredentials);  }  public @Bean MongoTemplate mongoTemplate() throws Exception {    return new MongoTemplate(mongoDbFactory());  }}

2.2 通过xml进行配置

简单用法（Mongo用默认的主机和端口号）

<mongo:db-factory dbname="database">

提供主机和端口配置的例子

<mongo:db-factory id="anotherMongoDbFactory"                  host="localhost"                  port="27017"                  dbname="database"                  username="joe"                  password="secret"/>

如果需要配置更多的options，我们可以用mongo-ref来指向一个已有的bean。

<context:property-placeholder location="classpath:/com/myapp/mongodb/config/mongo.properties"/><mongo:mongo host="${mongo.host}" port="${mongo.port}">  <mongo:options     connections-per-host="${mongo.connectionsPerHost}"     threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"     connect-timeout="${mongo.connectTimeout}"     max-wait-time="${mongo.maxWaitTime}"     auto-connect-retry="${mongo.autoConnectRetry}"     socket-keep-alive="${mongo.socketKeepAlive}"     socket-timeout="${mongo.socketTimeout}"     slave-ok="${mongo.slaveOk}"     write-number="1"     write-timeout="0"     write-fsync="true"/></mongo:mongo><mongo:db-factory dbname="database" mongo-ref="mongo"/><bean id="anotherMongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">  <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/></bean>

 


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