Requisitos previos Bool Int Float Decimal (Decimal)Marca de tiempo Cadena Blob Enumeración Struct Valores nulos y tipos dinámicos Conversión descendente a JSON

Uso de tipos de datos de Amazon Ion en Amazon QLDB

Amazon QLDB almacena sus datos en formato Amazon Ion. Para trabajar con datos en QLDB, debe usar una biblioteca de Ion como dependencia de un lenguaje de programación compatible.

En esta sección aprenderá a convertir datos de tipos nativos a sus equivalentes de Ion y viceversa. Esta guía de referencia muestra ejemplos de código que emplean el controlador QLDB para procesar datos de Ion en un libro mayor de QLDB. Incluye ejemplos de código para Java, .NET (C#), Go, Node.js (TypeScript) y Python.

Requisitos previos

Los siguientes ejemplos de código presuponen que tiene una instancia de controlador QLDB conectada a un libro mayor activo con una tabla denominada ExampleTable. La tabla contiene un único documento con los ocho siguientes campos:

ExampleBool
ExampleInt
ExampleFloat
ExampleDecimal
ExampleTimestamp
ExampleString
ExampleBlob
ExampleList

nota

A efectos de esta referencia, presuponga que el tipo almacenado en cada campo coincide con su nombre. En la práctica, QLDB no aplica definiciones de esquema o tipo de datos en los campos del documento.

Bool

En los siguientes ejemplos de código se muestra cómo procesar el tipo booleano Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

boolean exampleBoolean = driver.execute((txn) -> {
    // Transforming a Java boolean to Ion
    boolean aBoolean = true;
    IonValue ionBool = ionSystem.newBool(aBoolean);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleBool = ?", ionBool);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleBool from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java boolean
        // Cast IonValue to IonBool first
        aBoolean = ((IonBool)ionValue).booleanValue();
    }

    // exampleBoolean is now the value fetched from QLDB
    return aBoolean;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# bool to Ion.
bool nativeBool  = true;
IIonValue ionBool = valueFactory.NewBool(nativeBool);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleBool = ?", ionBool);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleBool from ExampleTable");
});

bool? retrievedBool = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# bool.
    retrievedBool = ionValue.BoolValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleBool, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aBool := true

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleBool = ?", aBool)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleBool FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult bool
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleBool is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonBoolean(driver: QldbDriver): Promise<boolean> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleBool = ?", true);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleBool FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to a TypeScript Boolean
            const boolValue: boolean = ionValue.booleanValue();
            return boolValue;
        })
    );
}

Python


def update_and_query_ion_bool(txn):
    # QLDB can take in a Python bool
    a_bool = True

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleBool = ?", a_bool)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleBool FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python bool is a child class of Python bool
        a_bool = ion_value

    # example_bool is now the value fetched from QLDB
    return a_bool


example_bool = driver.execute_lambda(lambda txn: update_and_query_ion_bool(txn))

Int

En los siguientes ejemplos de código se muestra cómo procesar el tipo de valor entero Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

int exampleInt = driver.execute((txn) -> {
    // Transforming a Java int to Ion
    int aInt = 256;
    IonValue ionInt = ionSystem.newInt(aInt);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleInt = ?", ionInt);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleInt from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java int
        // Cast IonValue to IonInt first
        aInt = ((IonInt)ionValue).intValue();
    }

    // exampleInt is now the value fetched from QLDB
    return aInt;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# int to Ion.
int nativeInt  = 256;
IIonValue ionInt = valueFactory.NewInt(nativeInt);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleInt = ?", ionInt);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleInt from ExampleTable");
});

int? retrievedInt = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# int.
    retrievedInt = ionValue.IntValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleInt, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aInt := 256

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleInt = ?", aInt)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleInt FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult int
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleInt is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonInt(driver: QldbDriver): Promise<number> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleInt = ?", 256);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleInt FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to a TypeScript Number
            const intValue: number = ionValue.numberValue();
            return intValue;
        })
    );
}

Python


def update_and_query_ion_int(txn):
    # QLDB can take in a Python int
    a_int = 256

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleInt = ?", a_int)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleInt FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python int is a child class of Python int
        a_int = ion_value

    # example_int is now the value fetched from QLDB
    return a_int


example_int = driver.execute_lambda(lambda txn: update_and_query_ion_int(txn))

Float

En los siguientes ejemplos de código se muestra cómo procesar el tipo de valor flotante Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

float exampleFloat = driver.execute((txn) -> {
    // Transforming a Java float to Ion
    float aFloat = 256;
    IonValue ionFloat = ionSystem.newFloat(aFloat);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleFloat = ?", ionFloat);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleFloat from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java float
        // Cast IonValue to IonFloat first
        aFloat = ((IonFloat)ionValue).floatValue();
    }

    // exampleFloat is now the value fetched from QLDB
    return aFloat;
});

.NET

Uso de C# float


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# float to Ion.
float nativeFloat = 256;
IIonValue ionFloat = valueFactory.NewFloat(nativeFloat);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleFloat = ?", ionFloat);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleFloat from ExampleTable");
});

float? retrievedFloat = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# float. We cast ionValue.DoubleValue to a float
    // but be cautious, this is a down-cast and can lose precision.
    retrievedFloat = (float)ionValue.DoubleValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Uso de C# double


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# double to Ion.
double nativeDouble = 256;
IIonValue ionFloat = valueFactory.NewFloat(nativeDouble);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleFloat = ?", ionFloat);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleFloat from ExampleTable");
});

double? retrievedDouble = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# double.
    retrievedDouble = ionValue.DoubleValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleFloat, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aFloat := float32(256)

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleFloat = ?", aFloat)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleFloat FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		// float64 would work as well
		var decodedResult float32
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleFloat is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonFloat(driver: QldbDriver): Promise<number> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleFloat = ?", 25.6);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleFloat FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to a TypeScript Number
            const floatValue: number = ionValue.numberValue();
            return floatValue;
        })
    );
}

Python


def update_and_query_ion_float(txn):
    # QLDB can take in a Python float
    a_float = float(256)

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleFloat = ?", a_float)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleFloat FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python float is a child class of Python float
        a_float = ion_value

    # example_float is now the value fetched from QLDB
    return a_float


example_float = driver.execute_lambda(lambda txn: update_and_query_ion_float(txn))

Decimal (Decimal)

En los siguientes ejemplos de código se muestra cómo procesar el tipo de valor decimal Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

double exampleDouble = driver.execute((txn) -> {
    // Transforming a Java double to Ion
    double aDouble = 256;
    IonValue ionDecimal = ionSystem.newDecimal(aDouble);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleDecimal = ?", ionDecimal);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleDecimal from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java double
        // Cast IonValue to IonDecimal first
        aDouble = ((IonDecimal)ionValue).doubleValue();
    }

    // exampleDouble is now the value fetched from QLDB
    return aDouble;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# decimal to Ion.
decimal nativeDecimal = 256.8723m;
IIonValue ionDecimal = valueFactory.NewDecimal(nativeDecimal);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleDecimal = ?", ionDecimal);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleDecimal from ExampleTable");
});

decimal? retrievedDecimal = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# decimal.
    retrievedDecimal = ionValue.DecimalValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleDecimal, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aDecimal, err := ion.ParseDecimal("256")
	if err != nil {
		return nil, err
	}

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleDecimal = ?", aDecimal)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleDecimal FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult ion.Decimal
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleDecimal is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonDecimal(driver: QldbDriver): Promise<Decimal> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Creating a Decimal value. Decimal is an Ion Type with high precision
            let ionDecimal: Decimal = dom.load("2.5d-6").decimalValue();
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleDecimal = ?", ionDecimal);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleDecimal FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Get the Ion Decimal
            ionDecimal = ionValue.decimalValue();
            return ionDecimal;
        })
    );
}

nota

También puede usar ionValue.numberValue() para transformar un decimal de Ion en un número de JavaScript. ionValue.numberValue() ofrece un mejor rendimiento, pero es menos preciso.

Python


def update_and_query_ion_decimal(txn):
    # QLDB can take in a Python decimal
    a_decimal = Decimal(256)

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleDecimal = ?", a_decimal)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleDecimal FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python decimal is a child class of Python decimal
        a_decimal = ion_value

    # example_decimal is now the value fetched from QLDB
    return a_decimal


example_decimal = driver.execute_lambda(lambda txn: update_and_query_ion_decimal(txn))

Marca de tiempo

En los siguientes ejemplos de código se muestra cómo procesar el tipo de marca temporal Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

Date exampleDate = driver.execute((txn) -> {
    // Transforming a Java Date to Ion
    Date aDate = new Date();
    IonValue ionTimestamp = ionSystem.newUtcTimestamp(aDate);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleTimestamp = ?", ionTimestamp);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleTimestamp from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java Date
        // Cast IonValue to IonTimestamp first
        aDate = ((IonTimestamp)ionValue).dateValue();
    }

    // exampleDate is now the value fetched from QLDB
    return aDate;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
using Amazon.IonDotnet;
...

IValueFactory valueFactory = new ValueFactory();

// Convert C# native DateTime to Ion.
DateTime nativeDateTime = DateTime.Now;

// First convert it to a timestamp object from Ion.
Timestamp timestamp = new Timestamp(nativeDateTime);
// Then convert to Ion timestamp.
IIonValue ionTimestamp = valueFactory.NewTimestamp(timestamp);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleTimestamp = ?", ionTimestamp);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleTimestamp from ExampleTable");
});

DateTime? retrievedDateTime = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# DateTime.
    retrievedDateTime = ionValue.TimestampValue.DateTimeValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleTimestamp, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aTimestamp := time.Date(2006, time.May, 20, 12, 30, 0, 0, time.UTC)
	if err != nil {
		return nil, err
	}

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleTimestamp = ?", aTimestamp)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleTimestamp FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult ion.Timestamp
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleTimestamp is now the value fetched from QLDB
		return decodedResult.GetDateTime(), nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonTimestamp(driver: QldbDriver): Promise<Date> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            let exampleDateTime: Date = new Date(Date.now());
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleTimestamp = ?", exampleDateTime);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleTimestamp FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to a TypeScript Date
            exampleDateTime = ionValue.timestampValue().getDate();
            return exampleDateTime;
        })
    );
}

Python


def update_and_query_ion_timestamp(txn):
    # QLDB can take in a Python timestamp
    a_datetime = datetime.now()

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleTimestamp = ?", a_datetime)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleTimestamp FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python timestamp is a child class of Python datetime
        a_timestamp = ion_value

    # example_timestamp is now the value fetched from QLDB
    return a_timestamp


example_timestamp = driver.execute_lambda(lambda txn: update_and_query_ion_timestamp(txn))

Cadena

En los siguientes ejemplos de código se muestra cómo procesar el tipo de cadena Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

String exampleString = driver.execute((txn) -> {
    // Transforming a Java String to Ion
    String aString = "Hello world!";
    IonValue ionString = ionSystem.newString(aString);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleString = ?", ionString);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleString from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java String
        // Cast IonValue to IonString first
        aString = ((IonString)ionValue).stringValue();
    }

    // exampleString is now the value fetched from QLDB
    return aString;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Convert C# string to Ion.
String nativeString = "Hello world!";
IIonValue ionString = valueFactory.NewString(nativeString);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleString = ?", ionString);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleString from ExampleTable");
});

String retrievedString = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# string.
    retrievedString = ionValue.StringValue;
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleString, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aString := "Hello World!"

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleString = ?", aString)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleString FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult string
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleString is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonString(driver: QldbDriver): Promise<string> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleString = ?", "Hello World!");

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleString FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to a TypeScript String
            const stringValue: string = ionValue.stringValue();
            return stringValue;
        })
    );
}

Python


def update_and_query_ion_string(txn):
    # QLDB can take in a Python string
    a_string = "Hello world!"

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleString = ?", a_string)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleString FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python string is a child class of Python string
        a_string = ion_value

    # example_string is now the value fetched from QLDB
    return a_string


example_string = driver.execute_lambda(lambda txn: update_and_query_ion_string(txn))

Blob

En los siguientes ejemplos de código se muestra cómo procesar el tipo de blob Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

byte[] exampleBytes = driver.execute((txn) -> {
    // Transforming a Java byte array to Ion
    // Transform any arbitrary data to a byte array to store in QLDB
    String aString = "Hello world!";
    byte[] aByteArray = aString.getBytes();
    IonValue ionBlob = ionSystem.newBlob(aByteArray);

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleBlob = ?", ionBlob);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleBlob from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Transforming Ion to a Java byte array
        // Cast IonValue to IonBlob first
        aByteArray = ((IonBlob)ionValue).getBytes();
    }

    // exampleBytes is now the value fetched from QLDB
    return aByteArray;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
using System.Text;
...

IValueFactory valueFactory = new ValueFactory();

// Transform any arbitrary data to a byte array to store in QLDB.
string nativeString = "Hello world!";
byte[] nativeByteArray = Encoding.UTF8.GetBytes(nativeString);
// Transforming a C# byte array to Ion.
IIonValue ionBlob = valueFactory.NewBlob(nativeByteArray);

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleBlob = ?", ionBlob);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleBlob from ExampleTable");
});

byte[] retrievedByteArray = null;

// Assume there is only one document in ExampleTable.
await foreach (IIonValue ionValue in selectResult)
{
    // Transforming Ion to a C# byte array.
    retrievedByteArray = ionValue.Bytes().ToArray();
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleBlob, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aBlob := []byte("Hello World!")

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleBlob = ?", aBlob)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleBlob FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult []byte
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleBlob is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonBlob(driver: QldbDriver): Promise<Uint8Array> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            const enc = new TextEncoder();
            let blobValue: Uint8Array = enc.encode("Hello World!");
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleBlob = ?", blobValue);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleBlob FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Transforming Ion to TypeScript Uint8Array
            blobValue = ionValue.uInt8ArrayValue();
            return blobValue;
        })
    );
}

Python


def update_and_query_ion_blob(txn):
    # QLDB can take in a Python byte array
    a_string = "Hello world!"
    a_byte_array = str.encode(a_string)

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleBlob = ?", a_byte_array)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleBlob FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python blob is a child class of Python byte array
        a_blob = ion_value

    # example_blob is now the value fetched from QLDB
    return a_blob


example_blob = driver.execute_lambda(lambda txn: update_and_query_ion_blob(txn))

Enumeración

En los siguientes ejemplos de código se muestra cómo procesar el tipo de lista Ion.

Java


// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

List<Integer> exampleList = driver.execute((txn) -> {
    // Transforming a Java List to Ion
    List<Integer> aList = new ArrayList<>();
    // Add 5 Integers to the List for the sake of example
    for (int i = 0; i < 5; i++) {
        aList.add(i);
    }
    // Create an empty Ion List
    IonList ionList = ionSystem.newEmptyList();
    // Add the 5 Integers to the Ion List
    for (Integer i : aList) {
        // Convert each Integer to Ion ints first to add it to the Ion List
        ionList.add(ionSystem.newInt(i));
    }

    // Insertion into QLDB
    txn.execute("UPDATE ExampleTable SET ExampleList = ?", (IonValue) ionList);

    // Fetching from QLDB
    Result result = txn.execute("SELECT VALUE ExampleList from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Iterate through the Ion List to map it to a Java List
        List<Integer> intList = new ArrayList<>();
        for (IonValue ionInt : (IonList)ionValue) {
            // Convert the 5 Ion ints to Java Integers
            intList.add(((IonInt)ionInt).intValue());
        }
        aList = intList;
    }

    // exampleList is now the value fetched from QLDB
    return aList;
});

.NET


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
using System.Collections.Generic;
...

IValueFactory valueFactory = new ValueFactory();

// Transforming a C# list to Ion.
IIonValue ionList = valueFactory.NewEmptyList();
foreach (int i in new List<int> {0, 1, 2, 3, 4})
{
    // Convert to Ion int and add to Ion list.
    ionList.Add(valueFactory.NewInt(i));
}

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleList = ?", ionList);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleList from ExampleTable");
});


List<int> retrievedList = new List<int>();
await foreach (IIonValue ionValue in selectResult)
{
    // Iterate through the Ion List to map it to a C# list.
    foreach (IIonValue ionInt in ionValue)
    {
        retrievedList.Add(ionInt.IntValue);
    }
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Go


exampleList, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aList := []int{1, 2, 3, 4, 5}

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleList = ?", aList)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleList FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult []int
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleList is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonList(driver: QldbDriver): Promise<number[]> {
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            let listOfNumbers: number[] = [1, 2, 3, 4, 5];
            // Updating QLDB
            await txn.execute("UPDATE ExampleTable SET ExampleList = ?", listOfNumbers);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT VALUE ExampleList FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // Get Ion List
            const ionList: dom.Value[] = ionValue.elements();
            // Iterate through the Ion List to map it to a JavaScript Array
            let intList: number[] = [];
            ionList.forEach(item => {
                // Transforming Ion to a TypeScript Number
                const intValue: number = item.numberValue();
                intList.push(intValue);
            });
            listOfNumbers = intList;
            return listOfNumbers;
        })
    );
}

Python


def update_and_query_ion_list(txn):
    # QLDB can take in a Python list
    a_list = list()
    for i in range(0, 5):
        a_list.append(i)

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleList = ?", a_list)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleList FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python blob is a child class of Python list
        a_list = ion_value

    # example_list is now the value fetched from QLDB
    return a_list


example_list = driver.execute_lambda(lambda txn: update_and_query_ion_list(txn))

Struct

En QLDB, los tipos de datos struct son particularmente únicos respecto a otros tipos de iones. Los documentos de nivel superior que se inserten en una tabla deben ser de tipo struct. Un campo de documento también puede almacenar un struct anidado.

En aras de la simplicidad, en los siguientes ejemplos se define un documento solo con los campos ExampleString y ExampleInt.

Java


class ExampleStruct {
    public String exampleString;
    public int exampleInt;

    public ExampleStruct(String exampleString, int exampleInt) {
        this.exampleString = exampleString;
        this.exampleInt = exampleInt;
    }
}

// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();

ExampleStruct examplePojo = driver.execute((txn) -> {
    // Transforming a POJO to Ion
    ExampleStruct aPojo = new ExampleStruct("Hello world!", 256);
    // Create an empty Ion struct
    IonStruct ionStruct = ionSystem.newEmptyStruct();
    // Map the fields of the POJO to Ion values and put them in the Ion struct
    ionStruct.add("ExampleString", ionSystem.newString(aPojo.exampleString));
    ionStruct.add("ExampleInt", ionSystem.newInt(aPojo.exampleInt));

    // Insertion into QLDB
    txn.execute("INSERT INTO ExampleTable ?", ionStruct);

    // Fetching from QLDB
    Result result = txn.execute("SELECT * from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Map the fields of the Ion struct to Java values and construct a new POJO
        ionStruct = (IonStruct)ionValue;
        IonString exampleString = (IonString)ionStruct.get("ExampleString");
        IonInt exampleInt = (IonInt)ionStruct.get("ExampleInt");
        aPojo = new ExampleStruct(exampleString.stringValue(), exampleInt.intValue());
    }

    // examplePojo is now the document fetched from QLDB
    return aPojo;
});

Como alternativa, puede usar la biblioteca de Jackson para mapear tipos de datos hacia y desde Ion. La biblioteca admite los demás tipos de datos de Ion, pero este ejemplo se centra en el tipo struct.


class ExampleStruct {
    public String exampleString;
    public int exampleInt;

    @JsonCreator
    public ExampleStruct(@JsonProperty("ExampleString") String exampleString,
                         @JsonProperty("ExampleInt") int exampleInt) {
        this.exampleString = exampleString;
        this.exampleInt = exampleInt;
    }

    @JsonProperty("ExampleString")
    public String getExampleString() {
        return this.exampleString;
    }

    @JsonProperty("ExampleInt")
    public int getExampleInt() {
        return this.exampleInt;
    }
}

// Instantiate an IonSystem from the Ion library
IonSystem ionSystem = IonSystemBuilder.standard().build();
// Instantiate an IonObjectMapper from the Jackson library
IonObjectMapper ionMapper = new IonValueMapper(ionSystem);

ExampleStruct examplePojo = driver.execute((txn) -> {
    // Transforming a POJO to Ion
    ExampleStruct aPojo = new ExampleStruct("Hello world!", 256);
    IonValue ionStruct;
    try  {
        // Use the mapper to convert Java objects into Ion
        ionStruct = ionMapper.writeValueAsIonValue(aPojo);
    } catch (IOException e) {
        // Wrap the exception and throw it for the sake of simplicity in this example
        throw new RuntimeException(e);
    }

    // Insertion into QLDB
    txn.execute("INSERT INTO ExampleTable ?", ionStruct);

    // Fetching from QLDB
    Result result = txn.execute("SELECT * from ExampleTable");
    // Assume there is only one document in ExampleTable
    for (IonValue ionValue : result)
    {
        // Use the mapper to convert Ion to Java objects
        try {
            aPojo = ionMapper.readValue(ionValue, ExampleStruct.class);
        } catch (IOException e) {
            // Wrap the exception and throw it for the sake of simplicity in this example
            throw new RuntimeException(e);
        }
    }

    // examplePojo is now the document fetched from QLDB
    return aPojo;
});

.NET

Use la biblioteca Amazon.QLDB.Driver.Serialization para mapear los tipos de datos de C# nativos hacia y desde Ion. La biblioteca admite los demás tipos de datos de Ion, pero este ejemplo se centra en el tipo struct.


using Amazon.QLDB.Driver.Generic;
using Amazon.QLDB.Driver.Serialization;
...

IAsyncQldbDriver driver = AsyncQldbDriver.Builder()
    .WithLedger("vehicle-registration")
    // Add Serialization library
    .WithSerializer(new ObjectSerializer())
    .Build();

// Creating a C# POCO.
ExampleStruct exampleStruct = new ExampleStruct
{
    ExampleString = "Hello world!",
    ExampleInt = 256
};

IAsyncResult<ExampleStruct> selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute(txn.Query<Document>("UPDATE ExampleTable SET ExampleStruct = ?", exampleStruct));

    // Fetching from QLDB.
    return await txn.Execute(txn.Query<ExampleStruct>("SELECT VALUE ExampleStruct from ExampleTable"));
});

await foreach (ExampleStruct row in selectResult)
{
    Console.WriteLine(row.ExampleString);
    Console.WriteLine(row.ExampleInt);
}

nota

Para convertirlo a código sincrónico, elimine las palabras clave await y async y cambie el tipo IAsyncResult a IResult.

Como alternativa, puede usar la biblioteca Amazon.IonDotNet.Builders para procesar tipos de datos de Ion.


using IAsyncResult = Amazon.QLDB.Driver.IAsyncResult;
...

IValueFactory valueFactory = new ValueFactory();

// Creating Ion struct.
IIonValue ionStruct = valueFactory.NewEmptyStruct();
ionStruct.SetField("ExampleString", valueFactory.NewString("Hello world!"));
ionStruct.SetField("ExampleInt", valueFactory.NewInt(256));

IAsyncResult selectResult = await driver.Execute(async txn =>
{
    // Insertion into QLDB.
    await txn.Execute("UPDATE ExampleTable SET ExampleStruct = ?", ionStruct);

    // Fetching from QLDB.
    return await txn.Execute("SELECT VALUE ExampleStruct from ExampleTable");
});

string retrievedString = null;
int? retrievedInt = null;

await foreach (IIonValue ionValue in selectResult)
{
    retrievedString = ionValue.GetField("ExampleString").StringValue;
    retrievedInt = ionValue.GetField("ExampleInt").IntValue;
}

Go


exampleStruct, err := driver.Execute(context.Background(), func(txn qldbdriver.Transaction) (interface{}, error) {
	aStruct := map[string]interface{} {
		"ExampleString": "Hello World!",
		"ExampleInt": 256,
	}

	// Insertion into QLDB
	_, err = txn.Execute("UPDATE ExampleTable SET ExampleStruct = ?", aStruct)
	if err != nil {
		return nil, err
	}

	// Fetching from QLDB
	result, err := txn.Execute("SELECT VALUE ExampleStruct FROM ExampleTable")
	if err != nil {
		return nil, err
	}

	// Assume there is only one document in ExampleTable
	if result.Next(txn) {
		var decodedResult map[string]interface{}
		err := ion.Unmarshal(result.GetCurrentData(), &decodedResult)
		if err != nil {
			return nil, err
		}

		// exampleStruct is now the value fetched from QLDB
		return decodedResult, nil
	}
	return nil, result.Err()
})

Node.js


async function queryIonStruct(driver: QldbDriver): Promise<any> {
    let exampleStruct: any = {stringValue: "Hello World!", intValue: 256};
    return (driver.executeLambda(async (txn: TransactionExecutor) => {
            // Inserting into QLDB
            await txn.execute("INSERT INTO ExampleTable ?", exampleStruct);

            // Fetching from QLDB
            const resultList: dom.Value[] = (await txn.execute("SELECT * FROM ExampleTable")).getResultList();

            // Assume there is only one document in ExampleTable
            const ionValue: dom.Value = resultList[0];
            // We can get all the keys of Ion struct and their associated values
            const ionFieldNames: string[] = ionValue.fieldNames();

            // Getting key and value of Ion struct to TypeScript String and Number
            const nativeStringVal: string = ionValue.get(ionFieldNames[0]).stringValue();
            const nativeIntVal: number = ionValue.get(ionFieldNames[1]).numberValue();
            // Alternatively, we can access to Ion struct fields, using their literal field names:
            //   const nativeStringVal = ionValue.get("stringValue").stringValue();
            //   const nativeIntVal = ionValue.get("intValue").numberValue();

            exampleStruct = {[ionFieldNames[0]]: nativeStringVal, [ionFieldNames[1]]: nativeIntVal};
            return exampleStruct;
        })
    );
}

Python


def update_and_query_ion_struct(txn):
    # QLDB can take in a Python struct
    a_struct = {"ExampleString": "Hello world!", "ExampleInt": 256}

    # Insertion into QLDB
    txn.execute_statement("UPDATE ExampleTable SET ExampleStruct = ?", a_struct)

    # Fetching from QLDB
    cursor = txn.execute_statement("SELECT VALUE ExampleStruct FROM ExampleTable")

    # Assume there is only one document in ExampleTable
    for ion_value in cursor:
        # Ion Python struct is a child class of Python struct
        a_struct = ion_value

    # example_struct is now the value fetched from QLDB
    return a_struct


example_struct = driver.execute_lambda(lambda txn: update_and_query_ion_struct(txn))

Valores nulos y tipos dinámicos

QLDB admite contenido abierto y no aplica definiciones de esquema o tipo de datos en los campos del documento. También puede almacenar valores nulos de Ion en un documento QLDB. Todos los ejemplos anteriores presuponen que cada tipo de datos devuelto es conocido y no es nulo. En los siguientes ejemplos se muestra cómo trabajar con Ion cuando no se conoce el tipo de datos o es posible que sea nulo.

Java


// Empty variables
String exampleString = null;
Integer exampleInt = null;

// Assume ionValue is some queried data from QLDB
IonValue ionValue = null;

// Check the value type and assign it to the variable if it is not null
if (ionValue.getType() == IonType.STRING) {
    if (ionValue.isNullValue()) {
        exampleString = null;
    } else {
        exampleString = ((IonString)ionValue).stringValue();
    }
} else if (ionValue.getType() == IonType.INT) {
    if (ionValue.isNullValue()) {
        exampleInt = null;
    } else {
        exampleInt = ((IonInt)ionValue).intValue();
    }
};

// Creating null values
IonSystem ionSystem = IonSystemBuilder.standard().build();

// A null value still has an Ion type
IonString ionString;
if (exampleString == null) {
    // Specifically a null string
    ionString = ionSystem.newNullString();
} else {
    ionString = ionSystem.newString(exampleString);
}

IonInt ionInt;
if (exampleInt == null) {
    // Specifically a null int
    ionInt = ionSystem.newNullInt();
} else {
    ionInt = ionSystem.newInt(exampleInt);
}

// Special case regarding null!
// There is a generic null type which has Ion type 'Null'.
// The above null values still have the types 'String' and 'Int'
IonValue specialNull = ionSystem.newNull();
if (specialNull.getType() == IonType.NULL) {
    // This is true!
}
if (specialNull.isNullValue()) {
    // This is also true!
}
if (specialNull.getType() == IonType.STRING || specialNull.getType() == IonType.INT) {
    // This is false!
}

.NET


// Empty variables.
string exampleString = null;
int? exampleInt = null;

// Assume ionValue is some queried data from QLDB.
IIonValue ionValue;

if (ionValue.Type() == IonType.String)
{
    exampleString = ionValue.StringValue;
}
else if (ionValue.Type() == IonType.Int)
{
    if (ionValue.IsNull)
    {
        exampleInt = null;
    }
    else
    {
        exampleInt = ionValue.IntValue;
    }
};

// Creating null values.
IValueFactory valueFactory = new ValueFactory();

// A null value still has an Ion type.
IIonValue ionString = valueFactory.NewString(exampleString);

IIonValue ionInt;
if (exampleInt == null)
{
    // Specifically a null int.
    ionInt = valueFactory.NewNullInt();
}
else
{
    ionInt = valueFactory.NewInt(exampleInt.Value);
}

// Special case regarding null!
// There is a generic null type which has Ion type 'Null'.
IIonValue specialNull = valueFactory.NewNull();
if (specialNull.Type() == IonType.Null) {
    // This is true!
}
if (specialNull.IsNull) {
    // This is also true!
}

Go

Limitaciones de clasificación

En Go, los valores nil no retienen su tipo cuando los clasifica y posteriormente los desclasifica. Un valor nil se clasifica como Ion nulo, pero Ion nulo se desclasifica con un valor cero en lugar de nil.


ionNull, err := ion.MarshalText(nil) // ionNull is set to ion null
if err != nil {
    return
}

var result int
err = ion.Unmarshal(ionNull, &result) // result unmarshals to 0
if err != nil {
    return
}

Node.js


// Empty variables
let exampleString: string;
let exampleInt: number;

// Assume ionValue is some queried data from QLDB
// Check the value type and assign it to the variable if it is not null
if (ionValue.getType() === IonTypes.STRING) {
    if (ionValue.isNull()) {
        exampleString = null;
    } else {
        exampleString = ionValue.stringValue();
    }
} else if (ionValue.getType() === IonTypes.INT) {
    if (ionValue.isNull()) {
        exampleInt = null;
    } else {
        exampleInt = ionValue.numberValue();
    }
}

// Creating null values
if (exampleString === null) {
    ionString = dom.load('null.string');
} else {
    ionString = dom.load.of(exampleString);
}

if (exampleInt === null) {
    ionInt = dom.load('null.int');
} else {
    ionInt = dom.load.of(exampleInt);
}

// Special case regarding null!
// There is a generic null type which has Ion type 'Null'.
// The above null values still have the types 'String' and 'Int'
specialNull: dom.Value = dom.load("null.null");
if (specialNull.getType() === IonType.NULL) {
    // This is true!
}
if (specialNull.getType() === IonType.STRING || specialNull.getType() === IonType.INT) {
    // This is false!
}

Python


# Empty variables
example_string = None
example_int = None

# Assume ion_value is some queried data from QLDB
# Check the value type and assign it to the variable if it is not null
if ion_value.ion_type == IonType.STRING:
    if isinstance(ion_value, IonPyNull):
        example_string = None
    else:
        example_string = ion_value
elif ion_value.ion_type == IonType.INT:
    if isinstance(ion_value, IonPyNull):
        example_int = None
    else:
        example_int = ion_value

# Creating Ion null values
if example_string is None:
    # Specifically a null string
    ion_string = loads("null.string")
else:
    # QLDB can take in Python string
    ion_string = example_string
if example_int is None:
    # Specifically a null int
    ion_int = loads("null.int")
else:
    # QLDB can take in Python int
    ion_int = example_int


# Special case regarding null!
# There is a generic null type which has Ion type 'Null'.
# The above null values still have the types 'String' and 'Int'
special_null = loads("null.null")
if special_null.ion_type == IonType.NULL:
    # This is true!
if special_null.ion_type == IonType.STRING or special_null.ion_type == IonType.INT:
    # This is false!

Conversión descendente a JSON

Si su aplicación requiere compatibilidad con JSON, puede realizar una conversión descendente de los datos de Amazon Ion a JSON. Sin embargo, la conversión de Ion a JSON conlleva pérdidas en algunos casos en los que los datos emplean tipos de Ion enriquecidos que no existen en JSON.

Para obtener más información sobre las reglas de conversión de Ion a JSON, consulte Conversión descendente a JSON en el Libro de recetas de Amazon Ion.

Aviso JavaScript está desactivado o no está disponible en su navegador.

Para utilizar la documentación de AWS, debe estar habilitado JavaScript. Para obtener más información, consulte las páginas de ayuda de su navegador.

Convenciones del documento

Paso 8: limpiar

Uso de datos e historial