John Davidson

php - AWS Timestream "Not equal" comparison throws error

0 comments
Message:


I have a query where I want to fetch all data where "completed" field is not equal to 0, but it throws an error. I dont get it why as their documentation supports these comparisons.


$result = $query_client->query([
'MaxRows' => 1,
'QueryString' => 'SELECT field1, field2, completed, date
FROM "db"."table"
WHERE completed != 0 // Tried as "0" as well, doesnt work
ORDER BY date DESC',
]);

Error:



com.amazonaws.timestream.v20181101.query#ValidationException,
'<>' cannot be applied to varchar, integer"




My Answer:
AWS Timestream is a fully managed time-series database service provided by Amazon Web Services (AWS). It is designed to store and analyze time-series data at scale, making it ideal for applications that require tracking and analyzing data over time, such as IoT applications, monitoring systems, and industrial applications.

To use AWS Timestream with PHP, you can leverage the AWS SDK for PHP, which provides a set of PHP classes that allow you to interact with AWS services, including Timestream. You can use the SDK to create, query, and manage Timestream databases, tables, and data points.

Here is an example of how you can use the AWS SDK for PHP to interact with AWS Timestream:

php
require 'vendor/autoload.php';

use Aws\Credentials\CredentialProvider;
use Aws\TimestreamWrite\TimestreamWriteClient;

$provider = CredentialProvider::defaultProvider();
$credentials = $provider()->wait();

$client = new TimestreamWriteClient([
'version' => 'latest',
'region' => 'us-east-1',
'credentials' => $credentials
]);

// Create a database
$client->createDatabase([
'DatabaseName' => 'myDatabase'
]);

// Create a table
$client->createTable([
'DatabaseName' => 'myDatabase',
'TableName' => 'myTable',
'RetentionProperties' => [
'MemoryStoreRetentionPeriodInHours' => 24,
'MagneticStoreRetentionPeriodInDays' => 7
]
]);

// Write data points to the table
$client->writeRecords([
'DatabaseName' => 'myDatabase',
'TableName' => 'myTable',
'Records' => [
[
'Dimensions' => [
[
'Name' => 'sensor_id',
'Value' => '123'
]
],
'MeasureName' => 'temperature',
'MeasureValue' => '25.5',
'MeasureValueType' => 'DOUBLE',
'Time' => '2022-01-01T00:00:00Z'
]
]
]);


This is just a basic example to get you started with using AWS Timestream in PHP. You can refer to the AWS SDK for PHP documentation for more advanced usage and features.

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