SELECT c＃Cassandraの結果をCSVファイルに書き込む

Question

CassandraのSELECTクエリの結果をCSVファイルに書きたいと思います。助けてください。私はC＃の新機能です。ここに私がしたことがあります。 CSVファイルに結果を書き込むための助け？おかげ

Cluster cluster = Cluster.Builder().AddContactPoint("127.0.0.1").Build(); 
List<string> lstOfKeyspaces = cluster.Metadata.GetKeyspaces().ToList<string>(); 
ISession session = cluster.Connect("test"); 
//get tables in the keysapce 
List<string> lstString = cluster.Metadata.GetTables("test").ToList<string>(); 
Console.WriteLine("Connection succeeded"); 
// Console.ReadLine(); 
// RowSet resultRequest = session.Execute(" select * from integrationobjects.emp"); 
//Execute a query on a connection synchronously 
var rs = session.Execute("SELECT * FROM emp"); 

Answer 1

ここでは、ソリューション

List<string> lstColumnName = new List<string>(); 
       string strPath = System.IO.Directory.GetCurrentDirectory(); 
       try 
       { 
        Cluster cassandraCluster = Cluster.Builder().AddContactPoint(strIpAddress).Build(); 
        ISession session = cassandraCluster.Connect(strKeyspace); 
        string strCqlRequest = "SELECT * FROM" + " " + strTable; 
        RowSet rs = session.Execute(strCqlRequest); 


        using (var w = new StreamWriter(strPathToSave)) 
        { 

         //get table columns with types 
         TableMetadata t = cassandraCluster.Metadata.GetTable(strKeyspace,strTable); 
         TableColumn[] arrcol = t.TableColumns; 

         foreach (var strCol in arrcol) 
         { 
          lstColumnName.Add(strCol.Name); 

         } 
         IDictionary<string,TableColumn> dic =t.ColumnsByName; 

         //Add column liste to the file 
         var strColumnLine = String.Join(",", lstColumnName.ToArray()); 
         w.WriteLine(strColumnLine); 
         //Iterate through the RowSet and add rows to the file 
         foreach (Row row in rs) 
         { 
          List<string> values = new List<string>(); 
          IEnumerator<Object> colEnumerator = row.GetEnumerator(); 

          while (colEnumerator.MoveNext()) 
          { 
           values.Add(colEnumerator.Current.ToString()); 
          } 
          var line = String.Join(",", values.ToArray()); 
          w.WriteLine(line); 
          w.Flush(); 

         } 

        }