public void Post(List <JobPosting> jobs)
{
using (SqlConnection con = new SqlConnection(connectionString))
{
con.Open();
for (int i = 0; i < jobs.Count; i++)
{
JobPosting job = jobs[i];
try
{
// Post new job into the database.
SqlCommand cmd = ConnectionWrapper("Jobs_insert", con);
cmd.Parameters.AddWithValue("@link", job.Url);
cmd.Parameters.AddWithValue("@company", job.Company);
cmd.Parameters.AddWithValue("@title", job.JobTitle);
cmd.Parameters.AddWithValue("@description", job.JobDescription);
cmd.Parameters.AddWithValue("@location", job.Location);
cmd.Parameters.AddWithValue("@post_date", job.PostDate);
cmd.Parameters.AddWithValue("@archived", job.Archived);
cmd.Parameters.AddWithValue("@date_applied", job.DateApplied ?? (object)DBNull.Value);
cmd.Parameters.Add("@id", SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
}
//if job already exists in the database, update the job's post date.
catch (SqlException exp) when(exp.Number == 2601)
{
SqlCommand c = ConnectionWrapper("Jobs_updatepostdate", con);
c.Parameters.AddWithValue("@link", job.Url);
c.Parameters.AddWithValue("@post_date", job.PostDate);
c.Parameters.AddWithValue("@location", job.Location);
c.ExecuteNonQuery();
continue;
// ignore and continue
}
}
}
}
/*
* The scraper will scrape every job listing on linkedin that contains my desired job titles.
* Job titles include: .NET Developer, C# Developer, Software Engineer, S Developer, Web Developer,
* Full Stack Developer, Back End Engineer, Front End Engineer, B and F Developer.
*
*/
public void LIScraper()
{
List <JobPosting> jobs = new List <JobPosting>();
// The URL uses LinkedIn's built-in filters, enabling us to input job titles, distance in miles from a specific location, location, and job type.
// EX: "keywords=Job+Title distance=15 locationId=PLACES%2Eus%2E7-1-0-19-99&f_TP=1%2C2&f_E=3%2C2&f_ JT=FULL_TIME
string initialUrl =
"https://www.linkedin.com/jobs/search?keywords=Software+Developer&distance=15&locationId=PLACES%2Eus%2E7-1-0-19-99&f_TP=1%2C2&f_E=3%2C2&f_JT=FULL_TIME&orig=FCTD&trk=jobs_jserp_facet_exp";
ChromeOptions options = new ChromeOptions();
options.AddArgument("--headless");
options.AddArgument("--incognito");
options.AddArgument("--ignore-certificate-errors");
//options.DebuggerAddress = "{http://localhost:49647|2605:e000:840e:f700:d5b4:8734:4391:4048}";
Trace.WriteLine("Hello");
Trace.WriteLine(options);
IWebDriver chromeDriver = new ChromeDriver(options);
int start = 1;
string pageRange = "&start=" + start + "&count=50";
string initialRange = initialUrl + pageRange;
chromeDriver.Url = initialRange;
var html = chromeDriver.PageSource;
var parser = new HtmlParser();
var doc = parser.Parse(html);
var listings = doc.QuerySelectorAll("li.job-listing");
string findListings = doc.QuerySelector("div.results-context > div > strong").TextContent;
int totalListings = 0;
if (findListings != null)
{
totalListings = Convert.ToInt32(findListings);
}
// LinkedIn allows up to 50 job listings on a single page.
int pages = 1;
addJobs(initialRange);
if (totalListings > 50)
{
int extraPage = 0;
if (totalListings % 50 > 0)
{
extraPage = 1;
}
pages = (int)Math.Floor((decimal)totalListings / 50) + extraPage;
for (int j = 1; j < pages; j++)
{
start = j * 50 + 1;
pageRange = "&start=" + start.ToString() + "&count=50";
addJobs(initialUrl + pageRange);
}
}
void addJobs(string url)
{
if (pages > 1)
{
options = new ChromeOptions();
options.AddArgument("--headless");
options.AddArgument("--incognito");
options.AddArgument("--ignore-certificate-errors");
chromeDriver = new ChromeDriver(options);
chromeDriver.Url = url;
html = chromeDriver.PageSource;
parser = new HtmlParser();
doc = parser.Parse(html);
listings = doc.QuerySelectorAll("li.job-listing");
}
for (int i = 0; i < listings.Length; i++)
{
JobPosting job = new JobPosting();
var listing = listings[i]
.QuerySelector("div.job-details");
var checkTitle = listing.QuerySelector("span.job-title-text").TextContent;
// Ignore job that contain these words in the job title.
if (!checkTitle.Contains("Senior") &&
!checkTitle.Contains("Sr") &&
!checkTitle.Contains("Lead") &&
!checkTitle.Contains("Principal") &&
!checkTitle.Contains("Java") &&
!checkTitle.Contains("Clearance") &&
!checkTitle.Contains("Graphics") &&
!checkTitle.Contains("Android") &&
!checkTitle.Contains("iOS") &&
!checkTitle.Contains("Wordpress") &&
!checkTitle.Contains("WordPress") &&
!checkTitle.Contains("PHP") &&
!checkTitle.Contains("Architect") &&
!checkTitle.Contains("Ruby") &&
!checkTitle.Contains("Manager") &&
!checkTitle.Contains("Design") &&
!checkTitle.Contains("UI") &&
!checkTitle.Contains("Python") &&
!checkTitle.Contains("HTML") &&
!checkTitle.Contains("CSS") &&
!checkTitle.Contains("Salesforce") &&
!checkTitle.Contains("SENIOR") &&
!checkTitle.Contains("Analyst") &&
checkTitle.Contains("Software Developer") //this needs to be changed with each search
)
{
job.JobTitle = checkTitle;
job.PostDate = listing.QuerySelector("span.date-posted-or-new").TextContent;
job.Company = listing.QuerySelector("span.company-name-text").TextContent;
string checkLocation = listing.QuerySelector("span.job-location > span").TextContent;
if (checkLocation.Contains(", US"))
{
job.Location = checkLocation.Replace(", US", "");
}
else
{
job.Location = checkLocation;
}
job.JobDescription = listing.QuerySelector("div.job-description").TextContent;
//Job Link
XmlDocument xml = new XmlDocument();
xml.LoadXml(listing.QuerySelector("a.job-title-link").OuterHtml);
XmlElement elem = xml.DocumentElement;
if (elem.HasAttribute("href"))
{
String attr = elem.GetAttribute("href");
var uri = attr.Split('?')[0];
job.Url = uri;
}
jobs.Add(job);
}
}
}
ScraperService scraperService = new ScraperService(ConfigurationManager.ConnectionStrings["LIConnection"].ConnectionString);
scraperService.Post(jobs);
}
