Value of the variable becomes empty when accessed outside the function in node js

I have the following code :

for(var index in workload.elements) { var arr = []; var resourceIdentifiers = {}; var elementinfo = {}; var metadataModified = {};

        elementinfo = workload.elements[index];


        arr[index] = workload.elements[index].uri;
        if(workload.elements[index].parameters.imageUri)
        {
            arr.push(workload.elements[index].parameters.imageUri);
        }
        resourceIdentifiers = arr.join(',');
        console.log('uri' + resourceIdentifiers);

        // connects with mysql and fetch data
        mysql.elementlevelpricing(resourceIdentifiers, function(result){

        elementlevelpricingSummary = JSON.stringify(result,null,2);
        console.log('resultin' + elementlevelpricingSummary);

        });

        console.log('resultout' + JSON.stringify(elementlevelpricingSummary,null,2))

    }

The value of the variable elementlevelpricingSummary becomes empty as {} when accessed outside the called function mysql.elementlevelpricing().