Merge pull request #34 from cflynn07/revert-33-revert-32-develop

Revert "Revert "Develop""

app/blog_posts.go

@@ -21,18 +21,18 @@ var bpKeys = make([]string, 5)
 var bp = make(blogPosts, 5)
 
 func init() {
-	post2019_02_26 := "2019-02-26-website-in-a-binary"
-	post2019_03_04 := "2019-03-04-helm-update-with-new-values"
-	post2019_08_30 := "2019-08-30-automatically-initialized-and-version-controlled-database-in-kubernetes-and-helm-development-environments"
-	post2019_09_10 := "2019-09-10-circleci-to-github-actions"
+	post2020_02_09 := "2020-02-09-book-review-mysql-crash-course"
+	post2020_01_18 := "2020-01-18-new-tricks"
 	post2019_12_23 := "2019-12-23-book-review-linux-command-line-shell-scripting-bible"
-	post2020_xx_xx := "2020-01-18-new-tricks"
-	post2020_xx_xx2 := "2020-xx-xx-book-review-mysql-crash-course"
+	post2019_09_10 := "2019-09-10-circleci-to-github-actions"
+	post2019_08_30 := "2019-08-30-automatically-initialized-and-version-controlled-database-in-kubernetes-and-helm-development-environments"
+	post2019_03_04 := "2019-03-04-helm-update-with-new-values"
+	post2019_02_26 := "2019-02-26-website-in-a-binary"
 
 	// Order determines post listing order. Newest entry at lowest index.
 	bpKeys = []string{
-		post2020_xx_xx,
-		// post_2020_xx_xx,
+		post2020_02_09,
+		post2020_01_18,
 		post2019_12_23,
 		post2019_09_10,
 		post2019_08_30,
@@ -70,16 +70,16 @@ func init() {
 		Keywords:    []string{"book review", "shell scripting", "linux command line and shell scripting", "bash", "technical book review"},
 		Date:        time.Date(2019, time.December, 23, 0, 0, 0, 0, time.UTC),
 	}
-	bp[post2020_xx_xx] = &postData{
+	bp[post2020_01_18] = &postData{
 		Title:       "New Tricks",
 		Description: template.HTML("A few new tricks and techniques I've recently incorporated into my workflow: (peco, yank, vim -, \"*yy register usage, hexyl, bat, bropages)"),
 		Keywords:    []string{},
 		Date:        time.Date(2020, time.January, 18, 0, 0, 0, 0, time.UTC),
 	}
-	bp[post2020_xx_xx2] = &postData{
+	bp[post2020_02_09] = &postData{
 		Title:       "Book Review: MySQL Crash Course",
-		Description: template.HTML(""),
+		Description: template.HTML("My thoughts after reading MySQL Crash Course by Ben Forta"),
 		Keywords:    []string{},
-		Date:        time.Date(2020, time.January, 18, 0, 0, 0, 0, time.UTC),
+		Date:        time.Date(2020, time.February, 9, 0, 0, 0, 0, time.UTC),
 	}
 }

app/handlers.go

@@ -42,7 +42,7 @@ func HomeHandler(w http.ResponseWriter, r *http.Request) {
 	for key, value := range bp {
 		data, err := postsBox.Find(key + ".md")
 		if err != nil {
-			log.Fatal("error opening post", err)
+			log.Fatal("error opening post ", err)
 		}
 		value.Content = string(blackfriday.Run(data))
 		value.ContentPreview = truncHelper(string(data))

posts/2020-02-09-book-review-mysql-crash-course.md

@@ -0,0 +1,93 @@
+<img src="/static/images/mysql-crash-course.png" style="width:50%;">
+
+"MySQL Crash Course" by Ben Forta is a somewhat outdated, yet still useful
+overview of MySQL functionality for a beginner or someone with experience that
+wants a review. The book was originally published in July 2006, during the
+heydays of MySQL 5.0. 14 years later the latest version of MySQL is 8, many
+things have changed but plenty remains the same.
+
+<a href="/static/images/mysql-crash-course-screenshot.png">
+  <img src="/static/images/mysql-crash-course-screenshot.png" style="width:100%;">
+</a>
+<span class="font-weight-bold">My tmux setup for reading MySQL Crash Course</span>
+
+I have a few years of experience working with MySQL and relational databases
+(SQL from 10 years ago that makes me
+[cringe](https://github.com/cflynn07/clubbingowl/blob/master/main/application/models/model_team_guest_lists.php#L508)
+today) and therefore I didn't come to this book with a beginner's perspective.
+I wanted an overview of MySQL to serve as a "warm up" for my planned subsequent
+adventure into <span class="font-weight-bold">"High Performance MySQL"</span>
+by Baron Schwartz, Peter Zaitsev, and Vadim Tkachenko.  Therefore, for me,
+this book was useful as it helped guide a focused review over core features
+of MySQL. For every topic the book touched on, I frequently embarked on a
+Google side quest to read supplementary blog posts or documentation. The
+sample database schema and example queries were useful. I found that executing
+the queries against my own MySQL server as I read along with the text led to
+experimentations on variations of the queries and further bolstered my
+comprehension. 
+
+The book is about 280 pages. The first 100 pages cover the basics of SELECT,
+INSERT, UPDATE and DELETE. Anyone that isn't completely new to MySQL or RDBMS's
+likely already has a good grasp of these. I breezed through this part of the
+book in one sitting. My pace through the latter half of the book was much
+slower due to all the side reading for each topic. Being a "crash course" book
+that's only ~280 pages, each topic is minimally covered. For example, chapter
+13 "Grouping Data" suggests using a WHERE clause to find `orders` placed within
+the last 9 months, but doesn't provide an example for how to do this. The lack
+of an example led to one of my side quests to the MySQL documentation on data
+and time functions
+([date-and-time-functions](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_subdate))
+to gather necessary the necessary knowledge to actually write the query. Since
+the provided sample data contains datetime values from 2005, I used an interval
+of 15 years instead of 9 months.
+
+<pre class="prettyprint">
+$ date
+Fri Jan 31 19:16:15 CST 2020
+$ cat<<-EOF | mysql -u root -ppassword -h 127.0.0.1 crashcourse 2>/dev/null
+  SELECT DATE_SUB(CURDATE(), INTERVAL 9 MONTH) AS 9_months_ago;
+EOF 
+--------------
+SELECT DATE_SUB(CURDATE(), INTERVAL 9 MONTH) AS 9_months_ago
+--------------
++--------------+
+| 9_months_ago |
++--------------+
+| 2019-05-09   |
++--------------+
+
+-- The Query I came up with (example not provided)
+-- Since all the example data orders are from 2005, I can't use
+-- 9 months so I use 20 years
+SELECT cust_id, COUNT(*) AS orders
+FROM orders
+WHERE DATE(order_date) > DATE_SUB(CURDATE(), INTERVAL 20 YEAR)
+GROUP BY cust_id
+HAVING COUNT(*) >= 2;
+</pre>
+
+The book does a good job of touching on full-text searching, views, stored
+procedures, cursors, triggers and transactions. Reviewing these spurred my mind
+to think of specific examples of problems encountered at previous startups
+where we as a team could have implemented solutions using the database layer
+but instead for whatever reasons missed these opportunities and implemented
+more convoluted and less robust solutions in the application layer.
+
+Being about 14 years old, some of the book examples are outdated. For instance,
+an example on page 167 suggests aliasing a column to 'rank' - however in MySQL
+8 'rank' is a reserved word.
+<pre class="prettyprint">
+-- No longer works, 'rank' is a reserved word
+SELECT note_text,
+       Match(note_text) Against('rabbit') AS rank
+FROM productnotes;
+</pre>
+
+And the newest features of MySQL 5.1-5.6 and MySQL 8 are naturally not covered,
+such as document stores (designed to counter popularity of NoSQL databases like
+mongodb). And by virtue of being a crash course, other topics like referential
+integrity and foreign keys are also not covered.
+
+There are better books out there that benefit simply by being newer. "MySQL 8
+Cookbook" by Karthik Appigatla appears to be a superior text, judging by the
+table of contents.