1) WordPress parses URLs into query variables, generates SQL queries to retrieve content from the database, and selects templates to display the content.
2) It uses rewrite rules to map URLs to internal WordPress queries and templates. Taxonomies like categories and tags are stored across multiple database tables with JOIN operations to link terms to posts.
3) Custom post types can be integrated by registering a custom query variable and rewrite rules to generate custom URLs and queries for the post type.
With the introduction of SQL Server 2012 data developers have new ways to interact with their databases. This session will review the powerful new analytic windows functions, new ways to generate numeric sequences and new ways to page the results of our queries. Other features that will be discussed are improvements in error handling and new parsing and concatenating features.
With the introduction of SQL Server 2012 data developers have new ways to interact with their databases. This session will review the powerful new analytic windows functions, new ways to generate numeric sequences and new ways to page the results of our queries. Other features that will be discussed are improvements in error handling and new parsing and concatenating features.
PostgreSQL Tutorial For Beginners | EdurekaEdureka!
YouTube Link: https://youtu.be/-VO7YjQeG6Y
** MYSQL DBA Certification Training https://www.edureka.co/mysql-dba **
This Edureka PPT on PostgreSQL Tutorial For Beginners (blog: http://bit.ly/33GN7jQ) will help you learn PostgreSQL in depth. You will also learn how to install PostgreSQL on windows. The following topics will be covered in this session:
What is DBMS
What is SQL?
What is PostgreSQL?
Features of PostgreSQL
Install PostgreSQL
SQL Command Categories
DDL Commands
ER Diagram
Entity & Attributes
Keys in Database
Constraints in Database
Normalization
DML Commands
Operators
Nested Queries
Set Operations
Special Operators
Aggregate Functions
Limit, Offset & Fetch
Joins
Views
Procedures
Triggers
DCL Commands
TCL Commands
Export/ Import Data
UUID Datatype
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
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Facebook: https://www.facebook.com/edurekaIN/
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LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
Open Standards for the Semantic Web: XML / RDF(S) / OWL / SOAPPieter De Leenheer
This lecture elaborates on RDF, RDFS, and SOAP starting from a short recap of XML, and the history of the W3C and the development of "open standard recommendations". We also compare RDF triples with DOGMA lexons. We finalise by listing shortcomings of RDFS regarding semantics, and give short overview of the history of OWL as one answer to this. A full elaboration on OWL and description logic is for another lecture.
PostgreSQL Tutorial For Beginners | EdurekaEdureka!
YouTube Link: https://youtu.be/-VO7YjQeG6Y
** MYSQL DBA Certification Training https://www.edureka.co/mysql-dba **
This Edureka PPT on PostgreSQL Tutorial For Beginners (blog: http://bit.ly/33GN7jQ) will help you learn PostgreSQL in depth. You will also learn how to install PostgreSQL on windows. The following topics will be covered in this session:
What is DBMS
What is SQL?
What is PostgreSQL?
Features of PostgreSQL
Install PostgreSQL
SQL Command Categories
DDL Commands
ER Diagram
Entity & Attributes
Keys in Database
Constraints in Database
Normalization
DML Commands
Operators
Nested Queries
Set Operations
Special Operators
Aggregate Functions
Limit, Offset & Fetch
Joins
Views
Procedures
Triggers
DCL Commands
TCL Commands
Export/ Import Data
UUID Datatype
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
Open Standards for the Semantic Web: XML / RDF(S) / OWL / SOAPPieter De Leenheer
This lecture elaborates on RDF, RDFS, and SOAP starting from a short recap of XML, and the history of the W3C and the development of "open standard recommendations". We also compare RDF triples with DOGMA lexons. We finalise by listing shortcomings of RDFS regarding semantics, and give short overview of the history of OWL as one answer to this. A full elaboration on OWL and description logic is for another lecture.
Assignment 2 - Power drill Grapevine "It's like Yik Yak, but for opinions ab...MATCHmaster
Assignment 2 - Power drill Grapevine
"It's like Yik Yak, but for opinions about Power drills"
GET ANSWER FROM EXPERTS AT ESSAYLINK.NET
Overview
This is an individual assignment in which you will explore the use of data interchange between web servers and browsers, dynamic construction of page content, and API design, using PHP, JavaScript, and JSON.
Important: This assignment specification is generated just for you. Do not distribute this specification. Timelines and Expectations
Percentage value of task: 20%
Due: Refer to Course Description
The outline of the presentation (presented at NDC 2011, Oslo, Norway):
- Short summary of OData evolution and current state
- Quick presentation of tools used to build and test OData services and clients (Visual Studio, LinqPad, Fiddler)
- Definition of canonical REST service, conformance of DataService-based implementation
- Updateable OData services
- Sharing single conceptual data model between databases from different vendors
- OData services without Entity Framework (NHibernate, custom data provider)
- Practical tips (logging, WCF binding, deployment)
SQL for Web APIs - Simplifying Data Access for API ConsumersJerod Johnson
From Nordic APIs Platform Summit 2019 - Stockholm, Sweden
As the data world evolves, businesses are moving more of their data out of databases and into SaaS applications. Despite the migration, SQL remains a ubiquitous language for data access, so much so that many SaaS applications and non-relational cloud data stores support SQL endpoints in their APIs. While these endpoints allow users to leverage SQL queries to easily request data, there are still costly challenges to overcome when it comes to processing and managing the returned data.
In this presentation, we'll showcase popular APIs that offer SQL endpoints, explore the benefits of providing customers SQL access, and cover how standards-based drivers enable SaaS integration and self-service data access through SQL.
WCF Data Services (formerly known as "ADO.NET Data Services") is a component of the .NET Framework that enables you to create services that use the Open Data Protocol (OData) to expose and consume data over the Web or intranet by using the semantics of representational state transfer (REST). OData exposes data as resources that are addressable by URIs. Data is accessed and changed by using standard HTTP verbs of GET, PUT, POST, and DELETE. OData uses the entity-relationship conventions of the Entity Data Model to expose resources as sets of entities that are related by associations.
This talk demonstrates how to use word2vec models in a Postgres database to facilitate semantic search of job posts. Attendees will learn to structure models for usage in a relational database.
JAVA EE DEVELOPMENT (JSP and Servlets)Talha Ocakçı
Java and J2EE is the most used technologies in enterprise web development. Telecom operators, service providers are using these technlogies; banking and insurance companies are moving to Java from old generation technologies.
https://www.udemy.com/java-web-developmen-with-real-world-development-flow
If you want to earn much in web development business, you also need to learn Java web technologies.
Java has de facto standart frameworks such as EJB 3.0, Spring and others that can be bound to them.
But at heart, they all use the similar JSP/Servlet technology and add some layers above them to speed up the development.
You will use them in your daily business but before using them, you must learn the basics and what is going on while using them. Otherwise, you will not be able to find a proper solution to common problems.
This course will make you understand the basics of JSP / servlet technlogies, designing a relational database, DB operations, design patterns, working with other developers,
and let you know the must-do operations in professional projects such as performance increasing, logging errors.
If you want to develop a web-site in a couple of hours without understanding what you are doing, you may go ahead and find other resources. But if you really want to understand what you are doing and learn the theory at the same time, this course will be a great oppurtunity for you. You will develop a real working project. Yow will first write quick and dirty code then you will apply professional patterns one by one while investigating the problems.
You will walk through a real development flow:
1- Write a quick and dirty code for doing the job.
2- You will design database tables and high performance queries
3 - You will apply design patterns to make the code reusable and high performance.
4 - You will beautify the user interface with Javascript and CSS tweaks
5- You will add exception handling, logging mechanism for production environment
6- AT THIS STEP, YOU WILL BE HIRED FOR MUCH MUCH HIGHER SALARIES. BECAUSE YOU ARE A REAL PROFESSIONAL.
1. Parsing Strange:URL to SQL to HTML Hal Stern snowmanonfire.comslideshare.net/freeholdhal headshot by Richard Stevenshttp://dieselsweeties.com
2. Why Do You Care? Database performance = user experience A little database expertise goes a long way Taxonomies for more than sidebar lists Custom post types WordPress as a powerful CMS >> blog Change default behaviors Defy the common wisdom Integrate other content sources/filters WordCamp NYC 2010 2
3. Flow of Control Web server URL manipulation Real file or permalink URL? URL to query variables What to display? Tag? Post? Category? Query variables to SQL generation How exactly to get that content? Template file selection How will content be displayed? Content manipulation 3 WordCamp NYC 2010
4. Whose File Is This? User URL request passed to web server Web server checks.htaccessfile WP install root Other .htaccessfiles may interfere Basic rewriting rules:If file or directory URL doesn’t exist, start WordPress via index.php WordCamp NYC 2010 4 <IfModulemod_rewrite.c> RewriteEngine On RewriteBase /whereyouputWordPress/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule>
5. Example Meta Fail: 404 Not Found Access broken image URLs for unintended results: no 404 pages!myblog/images/not-a-pic.jpg Web server can’t find file, assumes it’s a permalink, hands to WP WP can’t interpret it, so defaults to home WordCamp NYC 2010 5 myblog/ myblog/wp-content (etc) myblog/images
6. What Happens Before The Loop Parse URL into a query Set conditionals & select templates Execute the query & cache results Run the Loop:<?phpif (have_posts()) : while (have_posts()) : the_post(); //loop contentendwhile;endif;?> WordCamp NYC 2010 6
7. Examining the Query String SQL passed to MySQL in WP_Query object’s request element Brute force: edit theme footer.phpto see main loop’s query for displayed page WordCamp NYC 2010 7 <?php global $wp_query; echo ”SQL for this page "; echo $wp_query->request; echo "<br>"; ?>
8. SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts WHERE 1=1 AND wp_posts.post_type = 'post’ AND(wp_posts.post_status = 'publish' ORwp_posts.post_status = 'private’)ORDER BY wp_posts.post_date DESC LIMIT 0, 10 “Home Page” Query Deconstruction WordCamp NYC 2010 8 Get all fields from posts table, but limit number of returned rows Only get posts, and those that are published or private to the user Sort the results by date in descending order Start results starting with record 0 and up to 10 more results
9. Query Parsing parse_request() method of WP_Query extracts query variables from URL Execute rewrite rules Pick off ?p=67 style http GET variables Match permalink structure Match keywords like “author” and “tag” Match custom post type slugs WordCamp NYC 2010 9
10. Query Variables to SQL Query type: post by title, posts by category or tag, posts by date Variables for the query Slug values for category/tags Month/day numbers Explicit variable values post_typevariable has been around for a while; CPT queries fill in new values WordCamp NYC 2010 10
11. Simple Title Slug Parsing Rewrite matches root of permalink, extracts tail of URL as a title slug WordCamp NYC 2010 11 /2010/premio-sausage SELECT wp_posts.* FROM wp_posts WHERE 1=1 AND YEAR(wp_posts.post_date)='2010' AND wp_posts.post_name = 'premio-sausage' AND wp_posts.post_type = 'post' ORDER BY wp_posts.post_date DESC
12. CPT Query Variables Register CPT with a custom query variable 'query_var' => 'ebay' Variable works in URLs like built-ins myblog.com/?ebay=current_items myblog.com/?ebay=cool_searches Variable value matches CPT title slug WordCamp NYC 2010 12
13. WordPress Meta Data Common DB mechanics for all meta data Categories, tags, custom taxonomies Normalized down to 3 tables Terms: word strings and their slugs Taxonomies: collections of terms Relationships: terms attached to posts It’s so simple it gets really complex. Really. WordCamp NYC 2010 13
14. Graphs and JOIN Operations WordPress maps tags and categories 1:N to posts (each term in many posts) You need to punch MySQL to handle this INNER JOIN builds intermediate tables on common key values Following link in a graph is equivalent to an INNER JOIN on tables of linked items WordCamp NYC 2010 14
15. WordPress Taxonomy Tables Term relationships table maps N terms to each post Term taxonomy maps N terms to each taxonomy Term table has slugs for URL mapping WordCamp NYC 2010 15 wp_term_relationshipsobject_idterm_taxonomy_id wp_postspost_id….post_date… post_content wp_term_taxonomyterm_taxonomy_idterm_idtaxonomydescription wp_terms term_idnameslug
16. SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_postsINNER JOIN wp_term_relationships ON(wp_posts.ID = wp_term_relationships.object_id)INNER JOIN wp_term_taxonomy ON (wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id)INNER JOIN wp_terms ON (wp_term_taxonomy.term_id = wp_terms.term_id)WHERE 1=1 AND wp_term_taxonomy.taxonomy = 'post_tag' AND wp_terms.slug IN ('premio') AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 10 Taxonomy Lookup WordCamp NYC 2010 16 /tag/premio
17. More on Canonical URLs Canonical URLs improve SEO WordPress is really good about generating 301 Redirects for non-standard URLs Example: URL doesn’t appear to match a permalink, WordPress does prediction Use “LIKE title%” in WHERE clause Matches “title” as initial substring with % wildcard WordCamp NYC 2010 17
18. Modifying the Query Brute force isn’t necessarily good Using query_posts() ignores all previous parsing, runs a new SQL query Filter query_vars Change default parsing (convert any day to a week’s worth of posts, for example) Actions parse_query & parse_request Access WP_Query object before execution is_xx() conditionals are already set WordCamp NYC 2010 18
19. SQL Generation Filters posts_where More explicit control over query variable to SQL grammar mapping posts_join Add or modify JOIN operations for other graph relationships Many other filters Change grouping of results Change ordering of results WordCamp NYC 2010 19
20. Custom Post Types Change SQL WHERE clause on post type wp_posts.post_type=‘ebay’ Add new rewrite rules for URL parsing similar to category & tag Set slug in CPT registration array'rewrite' => array ("slug" => “ebay”), Watch out for competing, overwritten or unflushed rewrite entries<?php echo "<pre>”;print_r(get_option('rewrite_rules'));echo "</pre>”;?> WordCamp NYC 2010 20
21. Applications Stylized listings Category sorted alphabetically Use posts as listings of resources (jobs, clients, events) – good CPT application Custom URL slugs Add rewrite rules to match slug and set query variables Joining other social graphs Suggested/related content WordCamp NYC 2010 21
22. Template File Selection is_x() conditionals set in query parsing Used to drive template selection is_tag() looks for tag-slug, tag-id, then tag Full search hierarchy in Codex template_redirectaction Called in the template loader Add actions to override defaults WordCamp NYC 2010 22
23. HTML Generation Done in the_post() method Raw content retrieved from MySQL Short codes interpreted CSS applied Some caching plugins generate and store HTML, so YMMV WordCamp NYC 2010 23
24. Why Do You Care? User experience improvement JOINS are expensive Large post table & repetitive SELECTs = slow Running query once keeps cache warm Category, permalink, title slug choices matter More CMS, less “blog” Alphabetical sort Adding taxonomy/social graph elements WordCamp NYC 2010 24
26. Contact Hal Stern freeholdhal@gmail.com @freeholdhal snowmanonfire.com facebook.com/hal.stern Other Projects: amphibimen.com facebook.com/letusin slideshare.net/freeholdhal WordCamp NYC 2010 26
Editor's Notes
yesterday – UX, URLs are your currencyit’s how the world sees us, and gives us incredible flexibility to direct/guide users
SQL_CALC_FOUND_ROWS limits the number of returned rows via the LIMIT clause, and ensures that you don’t tax MySQL,Perform immense queries (SMOF has 600 post entries)WHERE 1=1 is for building compound where clauses; ensures there’s no degenerate caseType=post versus revision; status publish/private versus draft, trash
Look at rewrite.php, and canonical.php (more on that later)Default terms of “tag” and “category” can be changed in the Settings/Permalinks section of the Dashboard
You can
Separate namespaces for pages and postsWhat about parent pages?In this example the permalink structure is %year%/%title%
Three joins needed to build the full cartesian product of related tables.Get all of the terms that have a slug of “premio”, and find out what taxonomies they’re inGet the taxonomies that are post tags, and find all taxonomy object ids (that are post tags of slug “premio”)Get all of the posts that have this object id associated with them from term_relationshipsOrder the final table by post date,starting with the most recent (0) and getting 10 of them.
Don’t want multiple URLs pointing to the same page, so canonical parsing cleans them up