QueryRequest APIを使用したSQL演算子の例
QueryRequest APIを使用し、SQL演算子を使用して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SQLOperators.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 seq_comp_ope="SELECT bag.bagInfo[].tagNum,bag.bagInfo[].flightLegs[].fltRouteSrc FROM BaggageInfo bag WHERE bag.bagInfo[].flightLegs[].fltRouteSrc=any \"SFO\"";
System.out.println("Using Sequence Comparison operator ");
fetchRows(handle,seq_comp_ope);
String logical_ope="SELECT fullName, bag.bagInfo[].tagNum, bag.bagInfo[].routing,bag.bagInfo[].flightLegs[].fltRouteSrc FROM BaggageInfo bag WHERE NOT bag.bagInfo[].flightLegs[].fltRouteSrc=any \"SFO\"";
System.out.println("Using Logical operator ");
fetchRows(handle,logical_ope);
String value_comp_ope="SELECT fullname, bag.bagInfo[].routing FROM BaggageInfo bag WHERE gender=\"M\"";
System.out.println("Using Value Comparison operator ");
fetchRows(handle,value_comp_ope);
String in_ope="SELECT bagdet.fullName, bagdet.bagInfo[].tagNum FROM BaggageInfo bagdet WHERE bagdet.fullName IN (\"Lucinda Beckman\", \"Adam Phillips\",\"Dierdre Amador\",\"Fallon Clements\")";System.out.println("Using IN operator ");fetchRows(handle,in_ope);
String exists_ope="SELECT fullName, bag.ticketNo FROM BaggageInfo bag WHERE EXISTS bag.bagInfo[$element.bagArrivalDate >=\"2019-03-01T00:00:00\"]";
System.out.println("Using EXISTS operator ");
fetchRows(handle,exists_ope); 問合せを実行するには、borneo.NoSQLHandle.query()メソッドを使用します。
こちらにあるサンプルの中からフル・コードSQLOperators.pyをダウンロードします。
# Fetch data from the table
def fetch_data(handle,sqlstmt):
request = QueryRequest().set_statement(sqlstmt)
print('Query results for: ' + sqlstmt)
result = handle.query(request)
for r in result.get_results():
print('\t' + str(r)) seqcomp_stmt = '''SELECT bag.bagInfo[].tagNum,bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag WHERE bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"'''
print('Using Sequence Comparison operator:')
fetch_data(handle,seqcomp_stmt)
logope_stmt = '''SELECT fullName, bag.bagInfo[].tagNum, bag.bagInfo[].routing,
bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag
WHERE NOT bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"'''
print('Using Logical operator:')
fetch_data(handle,logope_stmt)
valcomp_stmt = '''SELECT fullname, bag.bagInfo[].routing
FROM BaggageInfo bag WHERE gender="M"'''
print('Using Value Comparison operator:')
fetch_data(handle,valcomp_stmt)
inope_stmt = '''SELECT bagdet.fullName, bagdet.bagInfo[].tagNum
FROM BaggageInfo bagdet WHERE bagdet.fullName IN
("Lucinda Beckman", "Adam Phillips","Dierdre Amador","Fallon Clements")'''
print('Using IN operator:')
fetch_data(handle,inope_stmt)
existsope_stmt = '''SELECT fullName, bag.ticketNo FROM BaggageInfo bag WHERE
EXISTS bag.bagInfo[$element.bagArrivalDate >="2019-03-01T00:00:00"]'''
print('Using EXISTS operator:')
fetch_data(handle,existsope_stmt)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SQLOperators.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()))
}
} seqcomp_stmt := `SELECT bag.bagInfo[].tagNum,bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag WHERE bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"`
fmt.Printf("Using Sequence Comparison operator:\n"
fetchData(client, err,tableName,seqcomp_stmt)
logope_stmt := `SELECT fullName, bag.bagInfo[].tagNum, bag.bagInfo[].routing,
bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag
WHERE NOT bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"`
fmt.Printf("Using Logical operator:\n")
fetchData(client, err,tableName,logope_stmt)
valcomp_stmt := `SELECT fullname, bag.bagInfo[].routing FROM BaggageInfo bag WHERE gender="M"`
fmt.Printf("Using Value Comparison operator:\n")
fetchData(client, err,tableName,valcomp_stmt)
inope_stmt := `SELECT bagdet.fullName, bagdet.bagInfo[].tagNum FROM BaggageInfo bagdet
WHERE bagdet.fullName IN ("Lucinda Beckman", "Adam Phillips","Dierdre Amador","Fallon Clements")`
fmt.Printf("Using IN operator:\n")
fetchData(client, err,tableName,inope_stmt)
existsope_stmt := `SELECT fullName, bag.ticketNo FROM BaggageInfo bag WHERE
EXISTS bag.bagInfo[$element.bagArrivalDate >="2019-03-01T00:00:00"]`
fmt.Printf("Using EXISTS operator:\n")
fetchData(client, err,tableName,existsope_stmt)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SQLOperators.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SQLOperators.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 seqcomp_stmt = `SELECT bag.bagInfo[].tagNum,bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag WHERE bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"`
console.log("Using Sequence Comparison operator");
await fetchData(handle,seqcomp_stmt);
const logope_stmt = `SELECT fullName, bag.bagInfo[].tagNum, bag.bagInfo[].routing,
bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag
WHERE NOT bag.bagInfo[].flightLegs[].fltRouteSrc=any "SFO"`
console.log("Using Logical operator");
await fetchData(handle,logope_stmt);
const valcomp_stmt = `SELECT fullname, bag.bagInfo[].routing FROM BaggageInfo bag WHERE gender="M"`
console.log("Using Value Comparison operator");
await fetchData(handle,valcomp_stmt);
const inope_stmt = `SELECT bagdet.fullName, bagdet.bagInfo[].tagNum
FROM BaggageInfo bagdet WHERE bagdet.fullName IN
("Lucinda Beckman", "Adam Phillips","Dierdre Amador","Fallon Clements")`
console.log("Using IN operator");
await fetchData(handle,inope_stmt);
const existsope_stmt = `SELECT fullName, bag.ticketNo FROM BaggageInfo bag WHERE
EXISTS bag.bagInfo[$element.bagArrivalDate >="2019-03-01T00:00:00"]`
console.log("Using EXISTS operator");
await fetchData(handle,existsope_stmt);
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SQLOperators.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 seqcomp_stmt =@"SELECT bag.bagInfo[].tagNum,bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag WHERE bag.bagInfo[].flightLegs[].fltRouteSrc=any ""SFO""";
Console.WriteLine("\nUsing Sequence Comparison operator!");
await fetchData(client,seqcomp_stmt);
private const string logope_stmt =@"SELECT fullName, bag.bagInfo[].tagNum, bag.bagInfo[].routing,
bag.bagInfo[].flightLegs[].fltRouteSrc
FROM BaggageInfo bag
WHERE NOT bag.bagInfo[].flightLegs[].fltRouteSrc=any ""SFO""";
Console.WriteLine("\nUsing Logical operator!");
await fetchData(client,logope_stmt);
private const string valcomp_stmt =@"SELECT fullname, bag.bagInfo[].routing FROM BaggageInfo bag WHERE gender=""M""" ;
Console.WriteLine("\nUsing Value Comparison operator!");
await fetchData(client,valcomp_stmt);
private const string inope_stmt =@"SELECT bagdet.fullName, bagdet.bagInfo[].tagNum
FROM BaggageInfo bagdet WHERE bagdet.fullName IN
(""Lucinda Beckman"", ""Adam Phillips"",""Dierdre Amador"",""Fallon Clements"")";
Console.WriteLine("\nUsing IN operator!");
await fetchData(client,inope_stmt);
private const string existsope_stmt =@"SELECT fullName, bag.ticketNo FROM BaggageInfo bag WHERE
EXISTS bag.bagInfo[$element.bagArrivalDate >=""2019-03-01T00:00:00""]";
Console.WriteLine("\nUsing EXISTS operator!");
await fetchData(client,existsope_stmt);