This code is a server-side script written in Lua for...

This code is a server-side script written in Lua for a FiveM roleplay server running the QBCore framework. Here is a breakdown of what it does:

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1. Retrieve the QBCore Object

local QBCore = exports['qb-core']:GetCoreObject()

This line retrieves the core object of the qb-core framework. It is used to access QBCore functionalities such as player data, commands, and exports.

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2. Add a Command (/save)

QBCore.Commands.Add("save", "Salva il veicolo e le modifiche", {}, false, function(source)
    local src = source
    TriggerClientEvent('qb-savevehicle:client:GetVehicleData', src)
end)

• This adds a new server-side command /save to QBCore's command system.
• When a player enters /save in the game, the function triggers a client-side event named qb-savevehicle:client:GetVehicleData. This is sent to the player who executed the command (source).

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3. Server-Side Event: Save Vehicle Data

RegisterNetEvent('qb-savevehicle:server:SaveVehicleData', function(vehicleProps)
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    local citizenid = Player.PlayerData.citizenid

• This registers a server-side event named qb-savevehicle:server:SaveVehicleData.
• It receives the vehicle's properties (vehicleProps, e.g., plate, modifications) as a parameter from the client.
• The script retrieves the player data of the player who triggered the event (using source) and extracts their unique citizenid.

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4. Save or Update Vehicle Data in the Database

    if vehicleProps and vehicleProps.plate and citizenid then
        local plate = vehicleProps.plate
        vehicleProps.model = GetEntityModel(NetworkGetEntityFromNetworkId(vehicleProps.netId or 0)) or vehicleProps.model

        local props_json = json.encode(vehicleProps)

        exports.oxmysql:insert('INSERT INTO saved_vehicles (citizenid, plate, vehicle_data) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE vehicle_data = ?', {
            citizenid, plate, props_json, props_json
        })

• It checks if the necessary vehicle data (vehicleProps with plate and the player's citizenid) exists.
• The vehicle's model is retrieved using its network ID or default model if not found.
• The vehicle properties are then JSON-encoded (props_json) for easy database storage.
• Using the oxmysql export, it inserts the vehicle data into the database table saved_vehicles. If a record with the same plate already exists for that citizenid, it updates the existing one instead (ON DUPLICATE KEY UPDATE clause).

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5. Notify the Player of Success or Failure

        TriggerClientEvent('QBCore:Notify', src, 'Veicolo salvato con successo!', 'success')
    else
        TriggerClientEvent('QBCore:Notify', src, 'Errore nel salvataggio del veicolo.', 'error')
    end
end)

• If the saving is successful, the player is notified via the QBCore:Notify client-side event with a success message.
• If there's an issue (e.g., missing data), the player receives an error notification.

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Overall Functionality

This code adds functionality for players to save their vehicle's properties (like modifications, model, etc.) to the server's database using /save. It interacts with the qb-core framework to:

1. Retrieve player data.
2. Gather vehicle information.
3. Save/update that information in the database.
4. Notify the player of the result. The data is stored in a table saved_vehicles with fields:

• citizenid (the player's unique identifier),
• plate (vehicle license plate),
• and vehicle_data (JSON-encoded vehicle properties).