Azure Table Storage
An Azure service that stores structured NoSQL data in the cloud.
170 questions
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Hi,
I am using @azure/data-tables javascript package to access the Table storage.
Trying to increment the count of a property in an Entity maintaining the Concurrency. How to perform the same using Etag property. I don't see any good examples in javascript.
Example: I will read "BuyersCount" property from Table and increment its value and overwrite the new value.
To update an entity in Azure Table Storage while maintaining concurrency, you can use the updateEntity
method from the @azure/data-tables
package. This method takes an entity
object as a parameter, which should include the PartitionKey
, RowKey
, and any properties you want to update. It also takes an optional options
parameter, which can include the ifMatch
property to specify the ETag value to match.
Here's an example code snippet to increment the BuyersCount
property of an entity with a specified PartitionKey
and RowKey
:
const { TableClient } = require("@azure/data-tables");
// Initialize the TableClient
const connectionString = "<your connection string>";
const tableName = "<your table name>";
const tableClient = new TableClient(connectionString, tableName);
// Define the entity to update
const partitionKey = "<your partition key>";
const rowKey = "<your row key>";
const entityToUpdate = {
PartitionKey: partitionKey,
RowKey: rowKey,
BuyersCount: <current value>, // Replace with the current value of the property
};
// Define the options for the update operation
const options = {
ifMatch: <current ETag>, // Replace with the current ETag value of the entity
};
// Increment the BuyersCount property
entityToUpdate.BuyersCount++;
// Update the entity
await tableClient.updateEntity(entityToUpdate, options);