Question

我正在执行以下mongodb查询，我是mongo db的新手，请告诉我我做错了什么

   db.entityCounter.aggregate([
   {
     $lookup:
       {
         from: "fields",
         localField: "code",
         foreignField: "fieldCode",
         as: "fieldsresult"
       }
  },{
      $match:{
          $and: [{
              "fieldsresult.isVisible":"1"
              },{"type":"field"
                  }]
          }
          }])

下面是Java春季代码

  LookupOperation lookupOperation = LookupOperation.newLookup()
            .from("fields")
            .localField("code")
            .foreignField("fieldCode")
            .as("fieldsresult");

    AggregationOperation match1 = Aggregation.match(Criteria.where("fieldsresult.isVisible").is("1"));

   // AggregationOptions aggregationOptions = Aggregation.newAggregationOptions();
    DBObject ob=new BasicDBObject();
    ((BasicDBObject) ob).put("batchSize",10);
    Aggregation aggregation = Aggregation.newAggregation(lookupOperation,match1).withOptions(Aggregation.newAggregationOptions().cursor(ob).build());



long val=0;
try {
    AggregationResults<EntityCounter> result = mongoOperations.aggregate(aggregation, Fields.class, EntityCounter.class);
    // val= result.getMappedResults();
}catch (Exception e){
    e.printStackTrace();

}

但是我遇到了错误

org.springframework.dao.InvalidDataAccessApiUsageException：命令执行失败：错误[需要'cursor'选项，但带有explain参数的聚合除外，Command = {“ aggregate”：“ entityCounter”，“ pipeline”：[ {“ $ match”：{“ fieldsresult.isVisible”：“ 1”}}，{“ $ lookup”：{“ from”：“ fields”，“ localField”：“ code”，“ foreignField”：“ fieldCode”， “ as”：“ fieldsresult”}}]};嵌套异常为com.mongodb.MongoCommandException：命令失败，错误为9：服务器本地主机：27017上，“光标”选项是必需的，但带有说明参数的聚合除外。完整的响应为{“ ok”：0.0，“ errmsg”：“'cursor'选项是必需的，除了带有explain参数的聚合”，“ code”：9，“ codeName”：“ FailedToParse”}

Answer 1

在mongodb 3.4中引入了查找功能，请升级您的dB

Java春季中使用AggregationOperation的Mongodb内部联接：错误[需要'cursor'选项，但带有explain参数的聚合除外]

1 个答案: