| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.metamodel.membrane.controllers; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| import org.apache.metamodel.DataContext; |
| import org.apache.metamodel.data.DataSet; |
| import org.apache.metamodel.membrane.app.TenantContext; |
| import org.apache.metamodel.membrane.app.TenantRegistry; |
| import org.apache.metamodel.membrane.swagger.model.QueryResponse; |
| import org.apache.metamodel.query.Query; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.springframework.beans.factory.annotation.Autowired; |
| import org.springframework.http.MediaType; |
| import org.springframework.web.bind.annotation.PathVariable; |
| import org.springframework.web.bind.annotation.RequestMapping; |
| import org.springframework.web.bind.annotation.RequestMethod; |
| import org.springframework.web.bind.annotation.RequestParam; |
| import org.springframework.web.bind.annotation.ResponseBody; |
| import org.springframework.web.bind.annotation.RestController; |
| |
| @RestController |
| @RequestMapping(value = { "/{tenant}/{dataContext}/query", "/{tenant}/{dataContext}/q" }, |
| produces = MediaType.APPLICATION_JSON_VALUE) |
| public class QueryController { |
| |
| private static final Logger logger = LoggerFactory.getLogger(QueryController.class); |
| |
| private final TenantRegistry tenantRegistry; |
| |
| @Autowired |
| public QueryController(TenantRegistry tenantRegistry) { |
| this.tenantRegistry = tenantRegistry; |
| } |
| |
| @RequestMapping(method = RequestMethod.GET) |
| @ResponseBody |
| public QueryResponse get(@PathVariable("tenant") String tenantId, |
| @PathVariable("dataContext") String dataSourceName, |
| @RequestParam(value = "sql", required = true) String queryString, |
| @RequestParam(value = "offset", required = false) Integer offset, |
| @RequestParam(value = "limit", required = false) Integer limit) { |
| final TenantContext tenantContext = tenantRegistry.getTenantContext(tenantId); |
| final DataContext dataContext = tenantContext.getDataSourceRegistry().openDataContext(dataSourceName); |
| |
| final Query query = dataContext.parseQuery(queryString); |
| |
| return executeQuery(tenantContext, dataSourceName, dataContext, query, offset, limit); |
| } |
| |
| public static QueryResponse executeQuery(TenantContext tenant, String dataSource, DataContext dataContext, |
| Query query, Integer offset, Integer limit) { |
| |
| if (offset != null) { |
| query.setFirstRow(offset); |
| } |
| if (limit != null) { |
| query.setMaxRows(limit); |
| } |
| |
| logger.info("{}/{} - Executing query: {}", tenant.getTenantName(), dataSource, query); |
| |
| final List<String> headers; |
| final List<List<Object>> data = new ArrayList<>(); |
| |
| try (final DataSet dataSet = dataContext.executeQuery(query)) { |
| headers = dataSet.getSelectItems().stream().map((si) -> si.toString()).collect(Collectors.toList()); |
| while (dataSet.next()) { |
| final Object[] values = dataSet.getRow().getValues(); |
| data.add(Arrays.asList(values)); |
| } |
| } |
| |
| final QueryResponse resp = new QueryResponse(); |
| resp.type("dataset"); |
| resp.headers(headers); |
| resp.data(data); |
| return resp; |
| } |
| } |