Query API examples
To execute your query, you use the
NoSQLHandle.query()
API.
Download the full code TableJoins.java from the examples
here.
/* fetch rows based on joins*/
private static void fetchRows(NoSQLHandle handle,String sql_stmt) throws Exception {
try (
QueryRequest queryRequest = new QueryRequest().setStatement(sql_stmt);
QueryIterableResult results = handle.queryIterable(queryRequest)) {
System.out.println("Query results:");
for (MapValue res : results) {
System.out.println("\t" + res);
}
}
}
/* fetching rows using left outer joins*/
String sql_stmt_loj ="SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo";
System.out.println("Fetching data using Left outer joins:");
fetchRows(handle,sql_stmt_loj);
To execute your query use the
borneo.NoSQLHandle.query()
method.
Download the full code TableJoins.py from the examples
here.
# Fetch data from the table based on joins
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))
sql_stmt_loj='SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo'
print('Fetching data using Left Outer Joins ')
fetch_data(handle,sql_stmt_loj)
To execute a query use the Client.Query
function.
Download the full code TableJoins.go from the examples
here.
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()))
}
}
querystmt_loj:= "SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo"
fmt.Println("Fetching data using Left Outer Joins")
fetchData(client, err,querystmt_loj)
To execute a query use query
method.
JavaScript: Download the full code TableJoins.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);
}
}
const stmt_loj = 'SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo';
console.log("Fetching data using Left Outer Joins");
await fetchData(handle,stmt_loj);
TypeScript: Download the full code TableJoins.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 stmt_loj = 'SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo';
console.log("Fetching data using Left Outer Joins");
await fetchData(handle,stmt_loj);
To execute a query, you may call QueryAsync
method
or call GetQueryAsyncEnumerable
method and iterate over the
resulting async enumerable.
Download the full code TableJoins.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.Row
{
Console.WriteLine();
Console.WriteLine(row.ToJsonString());
}
}
}
private const string stmt_loj ="SELECT * FROM ticket a LEFT OUTER JOIN ticket.bagInfo.flightLegs b ON a.ticketNo=b.ticketNo";
Console.WriteLine("Fetching data using Left Outer Joins: ");
await fetchData(client,stmt_loj);