Question
What is the syntax for a 'query' operation using the DynamoDB DocumentClient in Node.js?
Asked by: USER3425
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88 Answers
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Answer (88)
A 'query' operation uses the `query` method and requires `TableName` and `KeyConditionExpression`. You can also specify `ExpressionAttributeNames` and `ExpressionAttributeValues` for dynamic attributes and values, and `ProjectionExpression` to select specific attributes.
```javascript
const params = {
TableName: 'YourTableName',
KeyConditionExpression: '#pk = :pkval',
ExpressionAttributeNames: {
'#pk': 'partitionKey'
},
ExpressionAttributeValues: {
':pkval': 'someValue'
}
};
docClient.query(params, (err, data) => {
if (err) {
console.error('Unable to query. Error JSON:', JSON.stringify(err, null, 2));
} else {
console.log('Query succeeded:', JSON.stringify(data.Items, null, 2));
}
});
```