QueryRequest APIの使用例
QueryRequest APIを使用し、SQL関数を適用してNoSQL表からデータをフェッチできます。
問合せを実行するには、NoSQLHandle.query() APIを使用します。
こちらにあるサンプルの中からフル・コードSQLFunctions.javaをダウンロードします。
//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); 問合せを実行するには、borneo.NoSQLHandle.query()メソッドを使用します。
こちらにあるサンプルの中からフル・コードSQLFunctions.pyをダウンロードします。
# 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) 問合せを実行するには、Client.Query関数を使用します。
こちらにあるサンプルの中からフル・コードSQLFunctions.goをダウンロードします。
//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)問合せを実行するには、queryメソッドを使用します。
JavaScript: こちらにあるサンプルの中からフル・コードSQLFunctions.jsをダウンロードします。
//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: こちらにあるサンプルの中からフル・コードSQLFunctions.tsをダウンロードします。
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);問合せを実行するには、QueryAsyncメソッドをコールするか、GetQueryAsyncEnumerableメソッドをコールして、結果の非同期列挙可能性に対して反復処理します。
こちらにあるサンプルの中からフル・コードSQLFunctions.csをダウンロードします。
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);