我是Cloudant的新手,但已经在DB2上用SQL开发了一段时间。我遇到了一个问题,我认为我正在使用Lucene查询引擎和Cloudant索引从我的查询中返回结果,但只有三分之二的预期字段返回数据。不返回数据的字段是数组。我们的应用程序运行Java并使用IBM的Bluemix和WebSphere Liberty Profile执行。我打包了cloudant-client-2.8.0.jar和cloudant-HTTP-2.8.0.jar文件来访问cloudant数据库。我们有许多查询正在运行,因此连接本身很好。
以下是我访问Cloudant API的代码:
....
Search searchSaaSData = ServiceManagerSingleton.getInstance().getSaaSCapabilitiesDatabase().search("versioning-ddoc/versioning-indx").includeDocs(true);
SearchResult<DocTypeInfo> result = searchSaaSData.querySearchResult(this.getJsonSelector(deliverableId), DocTypeInfo.class);
....
这是this.getJsonSelector代码:
private String getVersioningSearch(String deliverableId) {
String query = "";
if (deliverableId != null && !deliverableId.isEmpty()) {
// Search based on deliverableId
query += "(";
query += "deliverableId:\"" + deliverableId + "\"" + ")";
}
logger.log(Level.INFO, "Search query is: " + query);
// The query is simple, will look like this:
// deliverableId:"0B439290AB5011E6BE74C84817AAB206")
return query;
}
从上面的java代码中我可以看到,我使用java对象DocTypeInfo.class来保存从搜索返回的数据。这是班级:
public class DocTypeInfo {
private final String docType;
private final String version;
private String isPublishedForReports;
public DocTypeInfo(String docType, String version) {
this.docType = docType;
this.version = version;
}
/**
* @return the docType
*/
private String getDocType() {
return docType;
}
/**
* @return the version
*/
private String getVersion() {
return version;
}
/**
* @return the isPublishedForReports
*/
public String getIsPublishedForReports() {
return isPublishedForReports;
}
/**
* @param isPublishedForReports the isPublishedForReports to set
*/
public void setIsPublishedForReports(String isPublishedForReports) {
this.isPublishedForReports = isPublishedForReports;
}
}
我使用Cloudant仪表板设置了设计文档和索引,如下所示:
{
"_id": "_design/versioning-ddoc",
"_rev": "22-0e0c0ccfc2b5fe7245352da7e5b1ebd3",
"views": {},
"language": "javascript",
"indexes": {
"versioning-indx": {
"analyzer": {
"name": "perfield",
"default": "standard",
"fields": {
"deliverableId": "whitespace",
"docType": "standard",
"version": "standard",
"isPublishedForReports": "keyword"
}
},
"index": "function (doc) {
index(\"deliverableId\", doc.deliverableId, {\"store\":true, \"boost\":1.0});
index(\"docType\", doc.docType, {\"store\":true, \"boost\":1.0});
index(\"version\", doc.version, {\"store\":true, \"boost\":1.0});
if (Array.isArray(doc.publishSettings)) {
for (var i in doc.publishSettings) {
if (doc.publishSettings[i].options) {
for (var j in doc.publishSettings[i].options) {
index(\"isPublishedForReports\", doc.publishSettings[i].options[j].optionId, {\"store\":true, \"boost\":1.0});
}
}
}
}
}"
}
}
}
当我执行搜索时,会填充docType和version字段,但isPublishedForReports字段始终为null或不返回。当我在Cloudant仪表板中针对索引运行查询时,我可以看到返回了isPublishedForReports值,我不知道它为什么没有填充在对象中?也许我误解了这些是如何构建的?
请帮忙! -Doug
答案 0 :(得分:1)
我认为您正在访问docs
中每行的result.rows
属性,而不是fields
属性。当您使用.includeDocs(true)
运行搜索时,您会看到类似于以下内容的结果:
{
"total_rows":3,
"bookmark":"g1AAA",
"rows":[
{
"id":"263a81ea76528dead3a4185df3676f62",
"order":[
1.0,
0
],
"fields":{
"docType":"xxx",
"deliverableId":"yyy",
"isPublishedForReports":"pu_1_2"
},
"doc":{
"_id":"263a81ea76528dead3a4185df3676f62",
"_rev":"3-116dd3831c182fb13c12b05a8b0996e4",
"docType":"xxx",
"deliverableId":"yyy",
"publishSettings":[...]
}
}
...
]
}
注意如何在fields
属性中查看您在搜索索引中定义的字段以及doc
属性中的完整文档。完整文档不包含isPublishedForReports
。
要获取isPublishedForReports
属性,您需要访问fields
属性:
for (SearchResult<DocTypeInfo>.SearchResultRow row : result.getRows()) {
...
row.getFields().getIsPublishedForReports()
...
}
此外,如果您不需要整个文档,则可以设置.includeDocs(false)
并仅访问fields
属性。