Multirow insert statement

RegisterCommand('test_sql', function()
    local function isLast(tbl, i)
        return i == table.len(tbl)
    end

    local function tableKeys(tbl)
        local keys = {}
        for k, _ in pairs(tbl) do
            table.insert(keys, k)
        end
        return keys
    end

    local function prepareMultipleRowsInsert(basicQuery, values)
        local query = basicQuery
        local i = 1
        local parametersMap = {}
        for _, data in ipairs(values) do
            local queryPart = '('
            local inI = 1
            local keyMap = {}
            local valueKeyMap = {}
            for key, value in pairs(data) do
                valueKeyMap[key] = value
            end
            for ind, v in ipairs(tableKeys(data)) do
                keyMap[ind] = v
            end

            for _, key in pairs(keyMap) do
                local value = valueKeyMap[key]
                local newKey = '@' .. key .. i
                if isLast(data, inI) then
                    queryPart = queryPart .. newKey
                else
                    queryPart = queryPart .. newKey .. ', '
                end
                parametersMap[newKey] = value

                inI = inI + 1
            end

            queryPart = queryPart .. ')'

            if i == 1 then
                query = query .. string.format("%s", queryPart)
            else
                query = query .. string.format(", %s", queryPart)
            end

            i = i + 1
        end
        return query, parametersMap
    end

    local query, parametersMap = prepareMultipleRowsInsert('INSERT INTO `rcore_multiple_insert` (`identifier`, `chat`) VALUES ', {
        {
            ['identifier'] = 'steam:11000010f1c5b5f',
            ['chat'] = 'some cool message',
        },
        {
            ['identifier'] = 'license:',
            ['chat'] = 'other message',
        }
    })

    print(query, dumpTable(parametersMap))

    --TODO CHECK
    --MySQL.Sync.execute(query, parametersMap)
end)