您可以使用Java SDK、Go SDK、Python SDK、Node.js SDK、.NET SDK和PHP SDK在创建多元索引时配置路由键。此处以Java SDK为例介绍路由键的配置和使用。
以下示例用于创建order数据表时创建order_index多元索引并指定路由字段为user_id字段。然后写入数据并带上路由字段进行查询。该数据表有order_id（string类型）和user_id（string类型）两个主键；该多元索引有product_name（keyword类型）、order_time（long类型）和user_id（keyword类型）字段，多元索引的路由键为user_id字段。
private static void testRoute(SyncClient client) throws InterruptedException {
//创建表。
TableMeta meta = new TableMeta("order");
meta.addPrimaryKeyColumn("order_id",PrimaryKeyType.STRING);
meta.addPrimaryKeyColumn("user_id",PrimaryKeyType.STRING);
TableOptions options = new TableOptions();
options.setMaxVersions(1);
options.setTimeToLive(-1);
CreateTableRequest request = new CreateTableRequest(meta,options);
request.setReservedThroughput(new ReservedThroughput(new CapacityUnit(0, 0)));
CreateTableResponse response = client.createTable(request);
//创建多元索引并指定路由字段。
CreateSearchIndexRequest searchIndexRequest = new CreateSearchIndexRequest();
//订单表。
searchIndexRequest.setTableName("order");
//订单表索引名。
searchIndexRequest.setIndexName("order_index");
IndexSchema indexSchema = new IndexSchema();
IndexSetting indexSetting = new IndexSetting();
//设置user_id为路由字段。
indexSetting.setRoutingFields(Arrays.asList("user_id"));
indexSchema.setIndexSetting(indexSetting);
//添加索引字段。此处只是给出示例，您可以根据业务需求添加索引字段。
indexSchema.setFieldSchemas(Arrays.asList(
new FieldSchema("product_name",FieldType.KEYWORD).setStore(true).setIndex(true),
new FieldSchema("order_time",FieldType.LONG).setStore(true).setEnableSortAndAgg(true).setIndex(true),
new FieldSchema("user_id",FieldType.KEYWORD).setStore(true).setIndex(true)
));
searchIndexRequest.setIndexSchema(indexSchema);
client.createSearchIndex(searchIndexRequest);
//等待数据表加载。
Thread.sleep(6*1000);
//插入一些测试数据。
String[] productName = new String[]{"product a", "product b", "product c"};
String[] userId = new String[]{"00001", "00002", "00003", "00004", "00005"};
for (int i = 0; i < 100; i++){
PrimaryKeyBuilder primaryKeyBuilder = PrimaryKeyBuilder.createPrimaryKeyBuilder();
primaryKeyBuilder.addPrimaryKeyColumn("order_id",PrimaryKeyValue.fromString(i+""));
primaryKeyBuilder.addPrimaryKeyColumn("user_id",PrimaryKeyValue.fromString(userId[i%(userId.length)]));
PrimaryKey primaryKey = primaryKeyBuilder.build();
RowPutChange rowPutChange = new RowPutChange("order",primaryKey);
//写入属性列。
rowPutChange.addColumn("product_name",ColumnValue.fromString(productName[i%(productName.length)]));
rowPutChange.addColumn("order_time",ColumnValue.fromLong(System.currentTimeMillis()));
rowPutChange.setCondition(new Condition(RowExistenceExpectation.IGNORE));
client.putRow(new PutRowRequest(rowPutChange));
}
//等待数据同步到多元索引。
Thread.sleep(20*1000);
//带上路由字段的查询。
SearchRequest searchRequest = new SearchRequest();
searchRequest.setTableName("order");
searchRequest.setIndexName("order_index");
MatchQuery matchQuery = new MatchQuery();
matchQuery.setFieldName("user_id");
matchQuery.setText("00002");
SearchQuery searchQuery = new SearchQuery();
searchQuery.setQuery(matchQuery);
searchQuery.setGetTotalCount(true);
SearchRequest.ColumnsToGet columnsToGet = new SearchRequest.ColumnsToGet();
columnsToGet.setReturnAll(true);
searchRequest.setColumnsToGet(columnsToGet);
searchRequest.setSearchQuery(searchQuery);
PrimaryKey routingValue1 = PrimaryKeyBuilder.createPrimaryKeyBuilder()
.addPrimaryKeyColumn("user_id", PrimaryKeyValue.fromString("00001"))
.build();
PrimaryKey routingValue2 = PrimaryKeyBuilder.createPrimaryKeyBuilder()
.addPrimaryKeyColumn("user_id", PrimaryKeyValue.fromString("00002"))
.build();
// 如果需要指定多个路由值，可以添加n个routingValue，这样服务端会从每个routingValue对应的分区里查询数据
searchRequest.setRoutingValues(Arrays.asList(routingValue1, routingValue2));
SearchResponse searchResponse = client.search(searchRequest);
System.out.println(searchResponse.isAllSuccess());
System.out.println("totalCount:"+ searchResponse.getTotalCount());
System.out.println("RowCount:"+searchResponse.getRows().size());
}
