Insert or update record in HighScore table - azure-mobile-services

Question

I have a table that receives high score entries. However, if the user already has an entry in the table (tracked through a GUID field, not the user parameter) I want to update it if the new entry has a better time otherwise don't change the existing record. However, if the user doesn't have a record in the high score table then add a new record. I also have two query parameters to pass to the query.
I want the insert operation to handle this for the table. I have this so far but I get an exception raised when I call InsertAsync(...) on the highscore table
function insert(item, user, request) {
var sql ="select Id from HighScore where PlayerGUID=? AND PlayerBadge=?";
mssql.query(sql, [user.PlayerGUID], [user.PlayerBadge], {
success: function(results) {
if(results.length > 0) {
// leader board record exists so update the current record
// Check the existing record and update it is the new time is better
console.log("Found existing entry");
} else {
// no record exists for this user to insert one
request.execute();
console.log("Found existing entry");
}
}
});
}
Can anyone offer me any assistance with achieving my goal?
Many thanks,
J.

Answer 1

It took some time and some help but here's where I ended up. It works just as I intended it to.
function insert(item, user, request) {
// Store the passed in item object for us when inserting or updating
resultsItem = item;
// Store the request object to allow calld functions to send respond commands
thisRequest = request;
// Retrieve the HighScore table so we can check it for an existing record
hsTable = tables.getTable('HighScore');
// Update the leaderboard
updateLeaderboard(item);
}
// Global variables
var resultsItem, hsTable, thisRequest;
function updateLeaderboard(item){
//Filter the table using the where operator to only include those
// records for the current PlayerGUID and PlayerBadge fields
hsTable.where({
PlayerGUID: item.PlayerGUID,
PlayerBadge: item.PlayerBadge
}).read({
success:updateScore,
error: errorHandler
})
}
function updateScore(results){
if(results.length > 0) {
// If a record already exists then check the PlayerTime
if(results[0].PlayerTime > resultsItem.PlayerTime)
{
// Update the PlayerTime if it is less than the currently saved value
hsTable.update({
id: results[0].id,
PlayerTime: resultsItem.PlayerTime
}, {
success: logSuccess,
error: errorHandler
})
} else {
// Send them OK. Could change this and use the returned code/text to display a custom
// message that tells the user that a previous time is faster.
thisRequest.respond(statusCodes.OK);
}
} else {
// The record for this PlayerGUID and PlayerBadge exists so write one
hsTable.insert({
PlayerName: resultsItem.PlayerName,
PlayerCountry: resultsItem.PlayerCountry,
PlayerTime: resultsItem.PlayerTime,
PlayerBadge: resultsItem.PlayerBadge,
PlayerGender: resultsItem.PlayerGender,
PlayerDOB: resultsItem.PlayerDOB,
PlayerGUID: resultsItem.PlayerGUID
}, {
success: logSuccess,
error: errorHandler
})
}
}
// Called if there is an error
function errorHandler(error){
console.error
("An error occurred trying to update leaderboard infor for player" +
resultsItem.PlayerName);
thisRequest.respond(statusCodes.BAD_REQUEST);
}
//Called if things work out ok.
function logSuccess()
{
thisRequest.respond(statusCodes.OK);
}