使用 NodeJS 查询 CosmosDB

Question

I am tying to query an existing Azure CosmosDB database with NodeJS.

getItems: function (callback) {
    var self = this;

    var querySpec = {
        query: 'SELECT * FROM root'
    };

    self.client.queryDocuments(self.collection._self, querySpec).toArray(function (err, results) {
        if (err) {
            console.log(err.body);
            callback(err);
        } else {
            callback(null, results);
        }
    });
}

For some reason it is keep complaining about Cross Partition Query . I am not really sure what it is. Any ideas where I may find this Partition Key and how to set it? Also, how can I avoid this exception in the query?

Full error message: Cross partition query is required but disabled. Please set x-ms-documentdb-query-enablecrosspartition to true, specify x-ms-documentdb-partitionkey, or revise your query to avoid this exception. Cross partition query is required but disabled. Please set x-ms-documentdb-query-enablecrosspartition to true, specify x-ms-documentdb-partitionkey, or revise your query to avoid this exception.

PS I know there are few similar questions asked already, but none of them addresses with NodeJS.

Answer 1

You're getting this error because the document collection you're querying against is a partitioned collection.

In order to query against a partitioned collection, you would either need to specify a partition against which to execute the query or specify that you want to query across partitions. BTW, former is recommended.

For cross-partition queries, you would need to specify the same in options. So your code would be:

getItems: function (callback) {
    var self = this;

    var querySpec = {
        query: 'SELECT * FROM root'
    };
    const options = {//Query options
      enableCrossPartitionQuery: true
    };

    self.client.queryDocuments(self.collection._self, querySpec, options).toArray(function (err, results) {
        if (err) {
            console.log(err.body);
            callback(err);
        } else {
            callback(null, results);
        }
    });
}

If you're querying against a single partition, you will need to specify the partition key value in the query. In this case, your options would look something like:

const options = {
  partitionKey: 'partition-key-value'
};