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## Examples using QueryRequest API

You can use `QueryRequest` API and apply SQL functions to fetch data from a NoSQL table.

To execute your query, you use the `NoSQLHandle.query()` API.

Download the full code SQLFunctions.java from the examples here.

     //Fetch rows from the table
    private static void fetchRows(NoSQLHandle handle,String sqlstmt) throws Exception {
       try (
          QueryRequest queryRequest = new QueryRequest().setStatement(sqlstmt);
          QueryIterableResult results = handle.queryIterable(queryRequest)){
          for (MapValue res : results) {
             System.out.println("\t" + res);
          }
       }
    }

    String ts_func1="SELECT timestamp_add(bag.bagInfo.flightLegs[0].estimatedArrival, \"5 minutes\")"+
                             " AS ARRIVAL_TIME FROM BaggageInfo bag WHERE ticketNo=1762341772625";
    System.out.println("Using timestamp_add function ");
    fetchRows(handle,ts_func1);
    String ts_func2="SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate, "+
                    "get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff "+
                     "FROM baggageinfo $s, $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg "+
                     "WHERE ticketNo=1762344493810";
    System.out.println("Using get_duration and timestamp_diff function ");
    fetchRows(handle,ts_func2);

To execute your query use the `borneo.NoSQLHandle.query()` method.

Download the full code SQLFunctions.py from the examples here.

    # Fetch data from the table
    def fetch_data(handle,sqlstmt):
       request = QueryRequest().set_statement(sqlstmt)
       print('Query results for: ' + sqlstmt)
       result = handle.query(request)
       for r in result.get_results():
          print('\t' + str(r))

     ts_func1 = '''SELECT timestamp_add(bag.bagInfo.flightLegs[0].estimatedArrival, "5 minutes")
                     AS ARRIVAL_TIME FROM BaggageInfo bag WHERE ticketNo=1762341772625'''
    print('Using timestamp_add function:')
    fetch_data(handle,ts_func1)

    ts_func2 = '''SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate,
                  get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff
                  FROM baggageinfo $s,
                  $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg
                  WHERE ticketNo=1762344493810'''
    print('Using get_duration and timestamp_diff function:')
    fetch_data(handle,ts_func2)

To execute a query use the `Client.Query` function.

Download the full code SQLFunctions.go from the examples here.

     //fetch data from the table
    func fetchData(client *nosqldb.Client, err error, tableName string, querystmt string)(){
       prepReq := &nosqldb.PrepareRequest{
    		Statement: querystmt,
       }
       prepRes, err := client.Prepare(prepReq)
       if err != nil {
          fmt.Printf("Prepare failed: %v\n", err)
          return
       }
       queryReq := &nosqldb.QueryRequest{
    		 PreparedStatement: &prepRes.PreparedStatement,   }
       var results []*types.MapValue
       for {
          queryRes, err := client.Query(queryReq)
          if err != nil {
             fmt.Printf("Query failed: %v\n", err)
      	return
          }
          res, err := queryRes.GetResults()
          if err != nil {
             fmt.Printf("GetResults() failed: %v\n", err)
      	return
          }
          results = append(results, res...)
          if queryReq.IsDone() {
             break
          }
       }
       for i, r := range results {
          fmt.Printf("\t%d: %s\n", i+1, jsonutil.AsJSON(r.Map()))
       }
    }

    ts_func1 := `SELECT timestamp_add(bag.bagInfo.flightLegs[0].estimatedArrival, "5 minutes")
                    AS ARRIVAL_TIME FROM BaggageInfo bag WHERE ticketNo=1762341772625`
    fmt.Printf("Using timestamp_add function::\n")
    fetchData(client, err,tableName,ts_func1)

    ts_func2 := `SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate,
                 get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff
                 FROM baggageinfo $s,
                 $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg
                 WHERE ticketNo=1762344493810`
    fmt.Printf("Using get_duration and timestamp_diff function:\n")
    fetchData(client, err,tableName,ts_func2)

To execute a query use `query` method.

JavaScript: Download the full code SQLFunctions.js from the examples here.

      //fetches data from the table
    async function fetchData(handle,querystmt) {
       const opt = {};
       try {
          do {
             const result = await handle.query(querystmt, opt);
             for(let row of result.rows) {
                console.log('  %O', row);
             }
             opt.continuationKey = result.continuationKey;
          } while(opt.continuationKey);
       } catch(error) {
          console.error('  Error: ' + error.message);
       }
    }

TypeScript: Download the full code SQLFunctions.ts from the examples here.

    interface StreamInt {
       acct_Id: Integer;
       profile_name: String;
       account_expiry: TIMESTAMP;
       acct_data: JSON;
    }

    /* fetches data from the table */
    async function fetchData(handle: NoSQLClient,querystmt: string) {
       const opt = {};
       try {
          do {
             const result = await handle.query<StreamInt>(querystmt, opt);
             for(let row of result.rows) {
                console.log('  %O', row);
             }
             opt.continuationKey = result.continuationKey;
          } while(opt.continuationKey);
       } catch(error) {
          console.error('  Error: ' + error.message);
       }
    }

    const ts_func1 = `SELECT timestamp_add(bag.bagInfo.flightLegs[0].estimatedArrival, "5 minutes")
                      AS ARRIVAL_TIME FROM BaggageInfo bag WHERE ticketNo=1762341772625`
    console.log("Using timestamp_add function:");
    await fetchData(handle,ts_func1);

    const ts_func2 = `SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate,
                      get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff
                      FROM baggageinfo $s,
                      $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg
                      WHERE ticketNo=1762344493810`
    console.log("Using get_duration and timestamp_diff function:");
    await fetchData(handle,ts_func2);

To execute a query, you may call `QueryAsync` method or call `GetQueryAsyncEnumerable` method and iterate over the resulting async enumerable.

Download the full code SQLFunctions.cs from the examples here.

    private static async Task fetchData(NoSQLClient client,String querystmt){
       var queryEnumerable = client.GetQueryAsyncEnumerable(querystmt);
       await DoQuery(queryEnumerable);
    }

    private static async Task DoQuery(IAsyncEnumerable<QueryResult<RecordValue>> queryEnumerable){
       Console.WriteLine("  Query results:");
       await foreach (var result in queryEnumerable) {
          foreach (var row in result.Rows)
          {
             Console.WriteLine();
             Console.WriteLine(row.ToJsonString());
          }
       }
    }

    private const string ts_func1 =@"SELECT timestamp_add(bag.bagInfo.flightLegs[0].estimatedArrival, ""5 minutes"")
                                           AS ARRIVAL_TIME FROM BaggageInfo bag WHERE ticketNo=1762341772625";
    Console.WriteLine("\nUsing timestamp_add function!");
    await fetchData(client,ts_func1);

    private const string ts_func2 =@"SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate,
                                           get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff
                                           FROM baggageinfo $s,
                                           $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg
                                           WHERE ticketNo=1762344493810";
    Console.WriteLine("\nUsing get_duration and timestamp_diff function!");
    await fetchData(client,ts_func2);