QueryRequest APIを使用したSQL式の例
QueryRequest APIを使用し、SQL式を使用してNoSQL表からのデータをフィルタできます。
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SQLExpressions.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 paran_expr="SELECT fullName, bag.bagInfo.tagNum, bag.bagInfo.routing, "+
"bag.bagInfo[].flightLegs[].fltRouteDest FROM BaggageInfo bag WHERE "+
"bag.bagInfo.flightLegs[].fltRouteSrc=any \"SFO\" AND "+
"(bag.bagInfo[].flightLegs[].fltRouteDest=any \"ATH\" OR "+
"bag.bagInfo[].flightLegs[].fltRouteDest=any \"JTR\" )";
System.out.println("Using Paranthesized expression ");
fetchRows(handle,paran_expr);
String case_expr="SELECT fullName,"+
"CASE WHEN NOT exists bag.bagInfo.flightLegs[0] "+
"THEN \"you have no bag info\" "+
"WHEN NOT exists bag.bagInfo.flightLegs[1] "+
"THEN \"you have one hop\" "+
"WHEN NOT exists bag.bagInfo.flightLegs[2] "+
"THEN \"you have two hops.\" "+
"ELSE \"you have three hops.\" "+
"END AS NUMBER_HOPS "+
"FROM BaggageInfo bag WHERE ticketNo=1762341772625";
System.out.println("Using Case Expression ");
fetchRows(handle,case_expr);
String seq_trn_expr="SELECT seq_transform(l.bagInfo[],"+
"seq_transform("+
"$sq1.flightLegs[],"+
"seq_transform("+
"$sq2.actions[],"+
"{"+
"\"at\" : $sq3.actionAt,"+
"\"action\" : $sq3.actionCode,"+
"\"flightNo\" : $sq2.flightNo,"+
"\"tagNum\" : $sq1.tagNum"+
"}"+
")"+
")"+
") AS actions FROM baggageInfo l WHERE ticketNo=1762376407826";
System.out.println("Using Sequence Transform Expressions ");
fetchRows(handle,seq_trn_expr); 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SQLExpressions.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)) paran_expr = '''SELECT fullName, bag.bagInfo.tagNum, bag.bagInfo.routing,
bag.bagInfo[].flightLegs[].fltRouteDest FROM BaggageInfo bag
WHERE bag.bagInfo.flightLegs[].fltRouteSrc=any "SFO" AND
(bag.bagInfo[].flightLegs[].fltRouteDest=any "ATH" OR
bag.bagInfo[].flightLegs[].fltRouteDest=any "JTR" )'''
print('Using Paranthesized expression:')
fetch_data(handle,paran_expr)
case_expr = '''SELECT fullName,
CASE
WHEN NOT exists bag.bagInfo.flightLegs[0]
THEN "you have no bag info"
WHEN NOT exists bag.bagInfo.flightLegs[1]
THEN "you have one hop"
WHEN NOT exists bag.bagInfo.flightLegs[2]
THEN "you have two hops."
ELSE "you have three hops."
END AS NUMBER_HOPS
FROM BaggageInfo bag WHERE ticketNo=1762341772625'''
print('Using Case Expression:')
fetch_data(handle,case_expr)
seq_trn_expr = '''SELECT seq_transform(l.bagInfo[],
seq_transform(
$sq1.flightLegs[],
seq_transform(
$sq2.actions[],
{
"at" : $sq3.actionAt,
"action" : $sq3.actionCode,
"flightNo" : $sq2.flightNo,
"tagNum" : $sq1.tagNum
}
)
)
) AS actions FROM baggageInfo l WHERE ticketNo=1762376407826'''
print('Using Sequence Transform Expressions:')
fetch_data(handle,seq_trn_expr) 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SQLExpressions.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()))
}
} paran_expr := `SELECT fullName, bag.bagInfo.tagNum, bag.bagInfo.routing,
bag.bagInfo[].flightLegs[].fltRouteDest FROM BaggageInfo bag
WHERE bag.bagInfo.flightLegs[].fltRouteSrc=any "SFO" AND
(bag.bagInfo[].flightLegs[].fltRouteDest=any "ATH" OR
bag.bagInfo[].flightLegs[].fltRouteDest=any "JTR" )`
fmt.Printf("Using Paranthesized expression:\n")
fetchData(client, err,tableName,paran_expr)
case_expr := `SELECT fullName,
CASE
WHEN NOT exists bag.bagInfo.flightLegs[0]
THEN "you have no bag info"
WHEN NOT exists bag.bagInfo.flightLegs[1]
THEN "you have one hop"
WHEN NOT exists bag.bagInfo.flightLegs[2]
THEN "you have two hops."
ELSE "you have three hops."
END AS NUMBER_HOPS
FROM BaggageInfo bag WHERE ticketNo=1762341772625`
fmt.Printf("Using Case Expression:\n")
fetchData(client, err,tableName,case_expr)
seq_trn_expr := `SELECT seq_transform(l.bagInfo[],
seq_transform(
$sq1.flightLegs[],
seq_transform(
$sq2.actions[],
{
"at" : $sq3.actionAt,
"action" : $sq3.actionCode,
"flightNo" : $sq2.flightNo,
"tagNum" : $sq1.tagNum
}
)
)
) AS actions FROM baggageInfo l WHERE ticketNo=1762376407826`
fmt.Printf("Using Sequence Transform Expressions:\n")
fetchData(client, err,tableName,seq_trn_expr)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SQLExpressions.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SQLExpressions.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: 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 paran_expr = `SELECT fullName, bag.bagInfo.tagNum, bag.bagInfo.routing,
bag.bagInfo[].flightLegs[].fltRouteDest FROM BaggageInfo bag
WHERE bag.bagInfo.flightLegs[].fltRouteSrc=any "SFO" AND
(bag.bagInfo[].flightLegs[].fltRouteDest=any "ATH" OR
bag.bagInfo[].flightLegs[].fltRouteDest=any "JTR" )`
console.log("Using Paranthesized expression");
await fetchData(handle,paran_expr);
const case_expr = `SELECT fullName,
CASE
WHEN NOT exists bag.bagInfo.flightLegs[0]
THEN "you have no bag info"
WHEN NOT exists bag.bagInfo.flightLegs[1]
THEN "you have one hop"
WHEN NOT exists bag.bagInfo.flightLegs[2]
THEN "you have two hops."
ELSE "you have three hops."
END AS NUMBER_HOPS
FROM BaggageInfo bag WHERE ticketNo=1762341772625`
console.log("Using Case Expression");
await fetchData(handle,case_expr);
const seq_trn_expr = `SELECT seq_transform(l.bagInfo[],
seq_transform(
$sq1.flightLegs[],
seq_transform(
$sq2.actions[],
{
"at" : $sq3.actionAt,
"action" : $sq3.actionCode,
"flightNo" : $sq2.flightNo,
"tagNum" : $sq1.tagNum
}
)
)
) AS actions FROM baggageInfo l WHERE ticketNo=1762376407826`
console.log("Using Sequence Transform Expressions");
await fetchData(handle,seq_trn_expr); 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SQLExpressions.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 paran_expr =@"SELECT fullName, bag.bagInfo.tagNum, bag.bagInfo.routing,
bag.bagInfo[].flightLegs[].fltRouteDest FROM BaggageInfo bag
WHERE bag.bagInfo.flightLegs[].fltRouteSrc=any ""SFO"" AND
(bag.bagInfo[].flightLegs[].fltRouteDest=any ""ATH"" OR
bag.bagInfo[].flightLegs[].fltRouteDest=any ""JTR"" )";
Console.WriteLine("\nUsing Paranthesized expression:!");
await fetchData(client,paran_expr);
private const string case_expr =@"SELECT fullName,
CASE
WHEN NOT exists bag.bagInfo.flightLegs[0]
THEN ""you have no bag info""
WHEN NOT exists bag.bagInfo.flightLegs[1]
THEN ""you have one hop""
WHEN NOT exists bag.bagInfo.flightLegs[2]
THEN ""you have two hops.""
ELSE ""you have three hops.""
END AS NUMBER_HOPS
FROM BaggageInfo bag WHERE ticketNo=1762341772625";
Console.WriteLine("\nUsing Case Expression!");
await fetchData(client,case_expr);
private const string seq_trn_expr =@"SELECT seq_transform(l.bagInfo[],
seq_transform(
$sq1.flightLegs[],
seq_transform(
$sq2.actions[],
{
""at"" : $sq3.actionAt,
""action"" : $sq3.actionCode,
""flightNo"" : $sq2.flightNo,
""tagNum"" : $sq1.tagNum
}
)
)
) AS actions FROM baggageInfo l WHERE ticketNo=1762376407826" ;
Console.WriteLine("\nUsing Sequence Transform Expressions!");
await fetchData(client,seq_trn_expr);