SuperMap 3D SDKs_ Unity plug-in development - connect data services for SQL queries

nannan

   In actual projects , We often encounter the need to find objects and filter them through certain attributes . Another popular example is convenient for us to better understand , such as ：“ There is a building , Would you like to inquire 2 All buildings in the building , And only show 2 floor , Other floors are hidden ”. At this time , You have to go through SQL Query out “2 floor ” Of all objects corresponding to this attribute ID, Re pass ID Array to control explicit and implicit （ adopt ID Array controls the explicit and implicit visibility of the blog ）. adopt SQL The query needs to connect to the data service , Let's take a look at unity How to connect data services in .

1. Data preparation

   Prepare model data for the project , Can be in SuperMap iDesktop Import model to generate model dataset , Then process the data , For example, add... In the attribute table “ floor ” Field , And assign corresponding field values （ See the picture 1.1）. Last Make a projection surface on the model data set to generate a two-dimensional surface data set （ Publish data services to speed up requests ）, Save the workspace （ See the picture 1.2） stay SuperMap iServer Publish data services and 3D services in （ See the picture 1.3）. Xiaobian is here on his own iDesktop The drawn surface is then extruded into a volume , give the result as follows ：

chart 1.1 Property sheet new “ floor ” Field and assign

chart 1.2 The model is added to the spherical scene after production cache

chart 1.3 Workspace publishing data services and 3D Services

2. Implementation code

   stay unity You need to create a new connection to the data service C# Script, establish button Control and make associated settings . Please refer to this blog for details https://blog.csdn.net/nan620403/article/details/124837056. Let's look at the code implementation process directly .

2.1 SQL Query parameters

   Define global variables DataServer（ Data services URL）、DatasourceName（ Data source name ） and DatasetName（ Dataset name ）.

public string DataServer = "http://localhost:8090/iserver/services/data-LouCeng/rest/data/featureResults.rjson?returnContent=true";//  Data services URL
public string DatasourceName = "unity"; //  Data source name 
public string DatasetName = " Architectural surface "; //  Dataset name 

   Click in the event to write C# Connect to the data service SQL Query statement , This article is to query the 2 Floor object , The specific code is as follows ：

 string datasetNames = DatasourceName + ":" + DatasetName;
 string json = "{\"getFeatureMode\":\"SQL\",\"datasetNames\":[\"" + datasetNames + "\"],\"maxFeatures\":\"1000\",\"queryParameter\":{\"sortClause\":null, \"ids\":null, \"name\":null, \"attributeFilter\":\" floor ='2 layer '\",\"groupClause\":null, \"linkItems\":null,\"joinItems\":null, \"fields\":null}}";

2.2 POST request

private string PostJson(string postJson)
    {
    
        string retString = "";
        try
        {
    
            string result = string.Empty;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(DataServer);
            var cookieContainer = new CookieContainer();
            request.Method = "POST";
            request.ContentType = "application/json";
         
            request.CookieContainer = cookieContainer;
            StreamWriter writer = new StreamWriter(request.GetRequestStream());
            writer.Write(postJson);
            writer.Close();
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string encoding = response.ContentEncoding;
            if (encoding == null || encoding.Length < 1)
            {
    
                encoding = "UTF-8";
            }
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));
            retString = reader.ReadToEnd();
        }
        catch (WebException wex)
        {
    
            Debug.Log(wex.Message);
        }
        catch (System.Exception ex)
        {
    
            Debug.Log(ex.Message);
        }

        return retString;
    }

2.3 Get the... Of the object after query ID Array

 private List<int> Listids(string json)
    {
    
        List<int> list = new List<int>();
        Dictionary<string, string> fieldsDic = new Dictionary<string, string>();
        JsonFile doc = new JsonFile();
        doc.LoadFromString(json);
        JsonFile feature = new JsonFile();
        doc.GetValue("features", ref feature);
        int size = feature.GetArraySize();
        for(int j=0;j<size;j++)
        {
    
            var child = feature.GetAt(j);
            JsonFile namesJson = new JsonFile();
            child.GetValue("fieldNames", ref namesJson);
            JsonFile valuesJson = new JsonFile();
            child.GetValue("fieldValues", ref valuesJson);

            var smid = -1;
            child.GetValue("ID", ref smid);
            Console.WriteLine(smid);
            list.Add(smid);
        }
        return list;
    }

2.4 adopt ID Array controls explicit and implicit

        List<LayerInfo> layerInfos = SupermapGIS.Instance.Layers.LayerInfos;// Get all layers in the layer manager 
        for (int i = 0; i < layerInfos.Count; i++)
        {
    
            Layer3D layer3D = layerInfos[i].Layer as Layer3D;// Traverse to get each layer in the layer manager 
            if (layer3D.Type == Layer3DType.S3M&&layer3D.Name== " Architecture @unity")
            {
    
                Layer3DS3MFile layer3DS3MFile = layerInfos[i].Layer as Layer3DS3MFile;// obtain S3M Cache layers 
                layer3DS3MFile.SetObjectsVisible(list1, true);// according to ID Controls the display and hiding of selected objects , Just make it visible 
            }
        }

3. Running results

For the data and codes used in this article, please refer to https://download.csdn.net/download/nan620403/85745014