1. 程式人生 > >elasticsearch-java api之索引(index)的各種操作

elasticsearch-java api之索引(index)的各種操作

1、建立索引:

1)簡單索引——沒有指定mapping

public static boolean createIndex(String indexName) {
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		CreateIndexResponse response = indicesAdminClient.prepareCreate(
				indexName).get();
		return response.isAcknowledged();
	}
由於es是無模式的資料庫,所以可以不指定mapping,按照插入資料的型別根據預設條件去索引。

2)複雜索引:

/**
	 * 建立複雜索引(型別/mapping)
	 * 
	 * @param indexName
	 *            索引名
	 * @param indexType
	 *            索引型別名
	 * @param mappingSource
	 *            索引mapping
	 */
	public static boolean createIndex(String indexName, String indexType,
			String mappingSource) {

		if (isExistsIndex(indexName)) {
			return false;
		}
		// setting
		Settings settings = Settings.builder().put("index.number_of_shards", 3)
				.put("index.number_of_replicas", 2).build();
		// mapping

		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		CreateIndexResponse response = indicesAdminClient
				.prepareCreate(indexName).setSettings(settings)// setting
				.addMapping(indexType, mappingSource)// type,mapping
				.get();
		return response.isAcknowledged();
	}

指定索引的setting和mapping,其中mappingSource是一個json資料字串。

2、設定索引型別和mapping:

/**
	 * 設定對映 在指定索引上一次性建立或修改一到多個索引的對映,指定的索引必須存在否則報錯。 可以結合建立簡單索引,然後在設定對映。
	 * 
	 * @param index
	 * @param type
	 * @return
	 */
	public static boolean putIndexMapping(String index, String type) {
		// mapping
		XContentBuilder mappingBuilder;
		try {
			mappingBuilder = XContentFactory.jsonBuilder().startObject()
					.startObject(type).startObject("properties")
					.startObject("name").field("type", "string")
					.field("store", "yes").endObject().startObject("sex")
					.field("type", "string").field("store", "yes").endObject()
					.startObject("college").field("type", "string")
					.field("store", "yes").endObject().startObject("age")
					.field("type", "long").field("store", "yes").endObject()
					.startObject("school").field("type", "string")
					.field("store", "yes").field("index", "not_analyzed")
					.endObject().endObject().endObject().endObject();
		} catch (Exception e) {
			return false;
		}
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		PutMappingResponse response = indicesAdminClient
				.preparePutMapping(index).setType(type)
				.setSource(mappingBuilder).get();
		return response.isAcknowledged();
	}
一般來說,可以先通過簡單索引建立一個索引,然後在設定該索引的型別和mapping。

3、判斷索引、索引型別是否存在:

/**
	 * 判斷指定的索引名是否存在
	 * 
	 * @param indexName
	 *            索引名
	 * @return 存在:true; 不存在:false;
	 */
	public static boolean isExistsIndex(String indexName) {
		IndicesExistsResponse response = transportClient
				.admin()
				.indices()
				.exists(new IndicesExistsRequest()
						.indices(new String[] { indexName })).actionGet();
		return response.isExists();
	}

	/**
	 * 判斷指定的索引的型別是否存在
	 * 
	 * @param indexName
	 *            索引名
	 * @param indexType
	 *            索引型別
	 * @return 存在:true; 不存在:false;
	 */
	public static boolean isExistsType(String indexName, String indexType) {
		TypesExistsResponse response = transportClient
				.admin()
				.indices()
				.typesExists(
						new TypesExistsRequest(new String[] { indexName },
								indexType)).actionGet();
		return response.isExists();
	}
4、刪除索引:
/**
	 * 刪除索引
	 * 
	 * @param indexName
	 *            索引名
	 * @return
	 */
	public static boolean deleteIndex(String indexName) {
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		DeleteIndexResponse response = indicesAdminClient
				.prepareDelete(indexName).execute().actionGet();
		return response.isAcknowledged();
	}

5、開啟、關閉索引:
/**
	 * 關閉索引
	 * 
	 * @param index
	 * @return
	 */
	public static boolean closeIndex(String index) {
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		CloseIndexResponse response = indicesAdminClient.prepareClose(index)
				.get();
		return response.isAcknowledged();
	}

	/**
	 * 開啟索引
	 * 
	 * @param index
	 * @return
	 */
	public static boolean openIndex(String index) {
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		OpenIndexResponse response = indicesAdminClient.prepareOpen(index)
				.get();
		return response.isAcknowledged();
	}

6、統計索引:
/**
	 * 索引統計
	 * 
	 * @param client
	 * @param index
	 */
	public static void indexStats(String index) {
		IndicesAdminClient indicesAdminClient = transportClient.admin()
				.indices();
		IndicesStatsResponse response = indicesAdminClient.prepareStats(index)
				.all().get();
		ShardStats[] shardStatsArray = response.getShards();
		for (ShardStats shardStats : shardStatsArray) {
			logger.info("shardStats {}", shardStats.toString());
		}
		Map<String, IndexStats> indexStatsMap = response.getIndices();
		for (String key : indexStatsMap.keySet()) {
			logger.info("indexStats {}", indexStatsMap.get(key));
		}
		CommonStats commonStats = response.getTotal();
		logger.info("total commonStats {}", commonStats.toString());
		commonStats = response.getPrimaries();
		logger.info("primaries commonStats {}", commonStats.toString());
	}

7、其他:

給索引設定別名等等。