[Spring Data MongoDB]學習筆記－－建立資料庫的串連

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1. 有了上一篇的Mongo後，串連資料庫我們還需要更多的資訊，比如資料庫名字，使用者名稱和密碼等。

我們可以繼續來配置MongoDbFactory的執行個體。

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

然後我們可以繼續用MongoDbFactory來建立MongoTemplate的執行個體。

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的實現。

 

2.1 通過Java based metadata來進行配置

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

如果需要認證的話，多加一個參數。

@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 通過xml進行配置

簡單用法（Mongo用預設的主機和連接埠號碼）

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

提供主機和連接埠配置的例子

<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，我們可以用mongo-ref來指向一個已有的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>