Golang Post.CommentCount方法代碼示例

func HackerNewsPostScraper(sub string) (err error) {
	//drivername := "postgres"
	//dsn := "user=golang password=golang dbname=golang sslmode=disable"
	//dialect := gorp.PostgresDialect{}

	drivername := "mysql"
	dsn := "golang:[email protected]/golang?parseTime=true"
	dialect := gorp.MySQLDialect{"InnoDB", "utf8mb4"}

	// connect to db using standard Go database/sql API
	db, err := sql.Open(drivername, dsn)
	if err != nil {
		return errors.New("sql.Open failed: " + err.Error())
	}

	// Open doesn't open a connection. Validate DSN data using ping
	if err = db.Ping(); err != nil {
		return errors.New("db.Ping failed: " + err.Error())
	}

	// Set the connection to use utf8bmb4
	if dialect.Engine == "InnoDB" {
		fmt.Println("Setting connection to utf8mb4")
		_, err = db.Exec("SET NAMES utf8mb4 COLLATE utf8mb4_general_ci")
		if err != nil {
			return errors.New("SET NAMES utf8mb4 COLLATE utf8mb4_general_ci: " + err.Error())
		}
	}

	// construct a gorp DbMap
	dbmap := &gorp.DbMap{Db: db, Dialect: dialect}
	defer dbmap.Db.Close()
	dbmap.DebugLevel = DebugLevel
	// Will log all SQL statements + args as they are run
	// The first arg is a string prefix to prepend to all log messages
	//dbmap.TraceOn("[gorp]", log.New(os.Stdout, "Trace:", log.Lmicroseconds))

	// register the structs you wish to use with gorp
	// you can also use the shorter dbmap.AddTable() if you
	// don't want to override the table name

	// SetKeys(true) means we have a auto increment primary key, which
	// will get automatically bound to your struct post-insert
	table := dbmap.AddTableWithName(post.Post{}, "posts_index_test")
	table.SetKeys(true, "PID")

	// Add the comments table
	table = dbmap.AddTableWithName(post.Comment{}, "comments_index_test")
	table.SetKeys(true, "Id")

	// create the table. in a production system you'd generally
	// use a migration tool, or create the tables via scripts
	if err = dbmap.CreateTablesIfNotExists(); err != nil {
		return errors.New("Create tables failed: " + err.Error())
	}

	// Force create all indexes for this database
	if err = dbmap.CreateIndexes(); err != nil {
		return errors.New("Create indexes failed: " + err.Error())
	}

	// Get data from hackernews
	geturl := "http://news.ycombinator.com/" + sub
	// DEBUG for a special thread
	//geturl := "https://news.ycombinator.com/item?id=10056146"
	body, err := GetHtmlBody(geturl)
	if err != nil {
		return errors.New("GetHtmlBody: " + err.Error())
	}

	// Create a new post slice and then parse the response body into ps
	ps := make([]*post.Post, 0)
	//cs := make([]*post.Comment, 0)
	ps, err = ParseHtmlHackerNews(body, ps)
	if err != nil {
		return errors.New("ParseHtmlHackerNews: " + err.Error())
	}

	// Number of updated posts
	var updatedPostsCount int64
	// Number of new posts
	var insertedPostsCount int64

	var insertedPostsCommentCount int64
	var updatedPostsCommentCount int64

	// Number of post parsing errors
	var htmlPostErrorCount uint32
	// Number of comment parsing errors
	var htmlCommentErrorCount uint32

	// loop over all parsed posts
	for _, htmlpost := range ps {

		if htmlpost.WebPostId == "" {
			if DebugLevel > 1 {
				fmt.Printf("WebPostId not set in %s\n", htmlpost.Title)
			}
			// Fail early, continue with next post
			continue
//.........這裏部分代碼省略.........