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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 string_func1="SELECT substring(bag.baginfo.routing,0,3) AS Source FROM baggageInfo bag WHERE ticketNo=1762376407826";
    System.out.println("Using substring function ");
    fetchRows(handle,string_func1);
    String string_func2="SELECT fullname, length(fullname) AS fullname_length FROM BaggageInfo WHERE ticketNo=1762320369957";
    System.out.println("Using length function ");
    fetchRows(handle,string_func2);
    String string_func3="SELECT fullname FROM baggageInfo bag WHERE EXISTS bag.bagInfo[contains($element.routing,\"SFO\")]";
    System.out.println("Using contains function ");
    fetchRows(handle,string_func3);

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))

     string_func1 = '''SELECT substring(bag.baginfo.routing,0,3) AS Source FROM baggageInfo bag
                         WHERE ticketNo=1762376407826'''
     print('Using substring function:')
     fetch_data(handle,string_func1)

     string_func2 = '''SELECT fullname, length(fullname) AS fullname_length FROM BaggageInfo
                         WHERE ticketNo=1762320369957'''
     print('Using length function:')
     fetch_data(handle,string_func2)

     string_func3 = '''SELECT fullname FROM baggageInfo bag WHERE
                         EXISTS bag.bagInfo[contains($element.routing,"SFO")]'''
     print('Using contains function:')
     fetch_data(handle,string_func3)

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()))
       }
    }

    string_func1 := `SELECT substring(bag.baginfo.routing,0,3) AS Source FROM baggageInfo bag
                        WHERE ticketNo=1762376407826`
    fmt.Printf("Using substring function:\n")
    fetchData(client, err,tableName,string_func1)

    string_func2 := `SELECT fullname, length(fullname) AS fullname_length FROM BaggageInfo
                        WHERE ticketNo=1762320369957`
    fmt.Printf("Using length function:\n")
    fetchData(client, err,tableName,string_func2)

    string_func3 := `SELECT fullname FROM baggageInfo bag WHERE
                        EXISTS bag.bagInfo[contains($element.routing,"SFO")]`
    fmt.Printf("Using contains function:\n")
    fetchData(client, err,tableName,string_func3)

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: any) {
       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 string_func1 = `SELECT substring(bag.baginfo.routing,0,3) AS Source FROM baggageInfo bag
                          WHERE ticketNo=1762376407826`
    console.log("Using substring function:");
    await fetchData(handle,string_func1);

    const string_func2 = `SELECT fullname, length(fullname) AS fullname_length FROM BaggageInfo
                          WHERE ticketNo=1762320369957`
    console.log("Using length function");
    await fetchData(handle,string_func2);

    const string_func3 = `SELECT fullname FROM baggageInfo bag WHERE
                          EXISTS bag.bagInfo[contains($element.routing,"SFO")]`
    console.log("Using contains function");
    await fetchData(handle,string_func3);

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 string_func1 =@"SELECT substring(bag.baginfo.routing,0,3) AS Source FROM baggageInfo bag
                                               WHERE ticketNo=1762376407826" ;
    Console.WriteLine("\nUsing substring function!");
    await fetchData(client,string_func1);

    private const string string_func2 =@"SELECT fullname, length(fullname) AS fullname_length FROM BaggageInfo
                                               WHERE ticketNo=1762320369957";
    Console.WriteLine("\nUsing length function!");
    await fetchData(client,string_func2);

    private const string string_func3 =@"SELECT fullname FROM baggageInfo bag WHERE
                                               EXISTS bag.bagInfo[contains($element.routing,""SFO"")]";
    Console.WriteLine("\nUsing contains function!");
    await fetchData(client,string_func3);