MySql Stored Procedures Geometry Tutorial

MySql Stored Procedures Geometry Tutorial

We’re back from rjmprogramming.com.au domain thoughts at MySql Stored Procedures User Grant Tutorial back to thinking more about where MySql is at these days regarding General Geometry Property Functions.

This series of functions applicable with MySql SQL DML or “Stored Procedures” (given you have a recent enough version of MySql) may be a more efficient approach for an application you write, perhaps avoiding “double handling” … maybe even “triple handling” in the hierarchy…

• MySql called from PHP (server side code) as a SELECT statement query result set … down to …
• PHP (calling the MySql) could achieve this too … down to …
• Javascript (at the client side) could, perhaps, achieve this too

… depending on what, geometry wise, you want to achieve. On our MAMP Apache/PHP/MySql web server incarnation of our MySql series, as you can see with our tutorial picture today using …

• PHP 7 … and …
• mysqli_connect() via 5.7.23 – MySQL

… we show …

• ST_Envelope
  

  Returns the minimum bounding rectangle (MBR) for the geometry value

  … via pretty obsessive application of MySql CONCAT function (as well as below)

• ST_Length
  

  Returns a double-precision number indicating the length of the LineString or MultiLineString value

Generally speaking, we totally recommend finding out more here, because the closer you keep the data to the functionality, the faster will be the applications you write. You’re here because you have decided on MySql as the data source (database) engine. Being as you’ve gone to all that organizational trouble, it would be a shame to not use MySql in a savvy way interfacing to what your data represents, as soon as integrated as possible.

And here is some downloadable supervisory PHP programming source code which gathers the MySql SQL requests made and can be renamed to the changed ourmysql_storedprocedure.php as required.

Previous relevant MySql Stored Procedures User Grant Tutorial is shown below.

MySql Stored Procedures User Grant Tutorial

Yesterday’s MySql Stored Procedures Spatial Tutorial was fully functional for what we wanted to cover on our local MAMP Apache/PHP/MySql web server featuring …

• PHP 7 … and …
• mysqli_connect() via 5.7.23 – MySQL

… but to offer any version of it “live” on rjmprogramming.com.au domain (which we generally try to do for your “reality of purpose” here at this blog) we came across many issues …

• PHP 5 … and …
• mysqli_connect() (ie. now the same, ditching the old mysql_connect() ideas) via 5.1.70-cll – MySQL … as well as …
• security concerns

Hence yesterday’s trepidation, huh?! But what makes databases like MySql, especially with its brilliant phpMyAdmin GUI interface, that “step up” from other data storage methodologies such as HTTP Cookies or Local Storage or Flat Files is the concept of a “user” … yoo, hoo!

The concept of a “user” with “databases” can then team up with concepts such as …

• privileges
• role

… in order to add so much more nuance and organization regarding who handles what computing task. Think blogs, for example, and you can have …

• administration users (you’ll hear “superuser” references) who can achieve all of the functionalities below, and more … versus …
• users who just read and never intend to write or comment
• users who want to write blog postings but need administrator help to delete them
• users who want to comment

… and various other “roles”. “Privileges” can help the “database” decide on what is allowed by a “user” to happen on the “database”.

Very good and secure “database” brands will start very restrictively, maybe on any database starting out with the one administrator “user”. To nuance from that position we need the “MySql” SQL GRANT command (for allowing, and REVOKE is for the other way around), and we’d like to thank and direct you to the excellent MySql GRANT advice as per …

Grant Permissions to MySQL User
The basic syntax for granting permissions is as follows:

GRANT permission ON database.table TO ‘user’@’localhost’;

Here is a short list of commonly used permissions :

ALL – Allow complete access to a specific database. If a database is not specified, then allow complete access to the entirety of MySQL.
CREATE – Allow a user to create databases and tables.
DELETE – Allow a user to delete rows from a table.
DROP – Allow a user to drop databases and tables.
EXECUTE – Allow a user to execute stored routines.
GRANT OPTION – Allow a user to grant or remove another user’s privileges.
INSERT – Allow a user to insert rows from a table.
SELECT – Allow a user to select data from a database.
SHOW DATABASES- Allow a user to view a list of all databases.
UPDATE – Allow a user to update rows in a table.

Coming back to our MySql “Stored Procedure” thoughts, it’s that “EXECUTE” GRANT above that is needed, and yet on our rjmprogramming.com.au domain web server, that idea was restricted. Hence, behind the scenes we detect this with our PHP, and that we MySql GRANT all the DML SQL (the day to day database populating and updating functionalities) of INSERT and UPDATE and SELECT and DELETE, and break the “Stored Procedures” up into (less cute) sets of DML SQL to achieve the same ends. However, we still present “Stored Procedure” thoughts because …

• phpMyAdmin (off cPanel (logged in administratively)) will allow you to create the “Stored Procedures”
• phpMyAdmin (off cPanel (logged in administratively)) will allow you to EXECUTE the copy and pasted “Stored Procedures” CALL (too)

As you can see here, the idea of a database (MySql) “user” can be a friend to your database “security” concerns, wouldn’t you say?

Previous relevant MySql Stored Procedures Spatial Tutorial is shown below.

MySql Stored Procedures Spatial Tutorial

Back when we wrote MySql Stored Procedures Primer Tutorial we wrote it more or less to use …

• PHP 5 and its …
• mysql_connect()

… MySql database connection logic, but today we have a dual (even trial) purpose in mind (… or “out of mind” if you were naughty and picked some of those mushrooms out and about at the moment (ie. please don’t)) for today’s revisit.

• get with the plan of using PHP 7 (as we do with our local MAMP Apache/PHP/MySql web server here) along with mysqli_connect … and …
• start you thinking about MySql’s excellent Spatial Convenience Functions, such as st_distance_sphere() function to determine (in metres) crow fly distances between points (longitude, latitude) on Earth … and …
• verify that MySql Stored Procedures haven’t changed as far as arrangements go with all this

So, here is some downloadable PHP programming source code which shows the results of the MySql SQL requests made and can be renamed to the changed ourmysqlstoredprocedure.php as required.

And here is some downloadable supervisory PHP programming source code which gathers the MySql SQL requests made and can be renamed to the changed ourmysql_storedprocedure.php as required.

A tad trepidatiously we also offer you today’s live run link that we explain more about regarding restrictiveness and its allowances, tomorrow.

You can also see this play out at WordPress 4.1.1’s MySql Stored Procedures Primer Tutorial.

Previous relevant MySql Stored Procedures Primer Tutorial is shown below.

MySql Stored Procedures Primer Tutorial

Today’s tutorial follows up on phpMyAdmin interface to MySql and PHP Primer Tutorial in that we again use the brilliant phpMyAdmin to oversee the results of some PHP code which uses MySql calls to create tables called POINT and CIRCLE used to store information defining a circle, and then it creates three MySql stored procedures in the database to help add circle data with the single MySql statement that goes CALL AddCircle(x, y, radius); via the use of those stored procedures. Let’s see below what Wikipedia says about Stored Procedures generally.

A stored procedure is a subroutine available to applications that access a relational database system. A stored procedure (sometimes called a proc, sproc, StoPro, StoredProc, sp or SP) is actually stored in the database data dictionary.

Typical use for stored procedures include data validation (integrated into the database) or access control mechanisms. Furthermore, stored procedures can consolidate and centralize logic that was originally implemented in applications. Extensive or complex processing that requires execution of several SQL statements is moved into stored procedures, and all applications call the procedures. One can use nested stored procedures by executing one stored procedure from within another.

Stored procedures are similar to user-defined functions (UDFs). The major difference is that UDFs can be used like any other expression within SQL statements, whereas stored procedures must be invoked using the CALL statement.[1]

Here is some downloadable PHP programming source code which shows the results of the MySql SQL requests made and can be renamed to ourmysqlstoredprocedure.php as required.

Here is some downloadable supervisory PHP programming source code which gathers the MySql SQL requests made and can be renamed to ourmysql_storedprocedure.php as required.

If you want to develop your own live usage (have provided a live usage link here which will not work but you can use if you are a beginner, to get used to mysql errors, which will occur after you hit either button of the link (these errors indicate bad MySql connection details which are the same reason the database dropdown is not full of options), or you can use this link to see the raw MySql SQL involved in piecing this tutorial together) of these two PHP source codes then you could fix up the hard codings for MySql host/username/password up the top of ourmysql_storeprocedure.php (where you may notice that the default host in the code is localhost:8889 which is the default host string for MySql (ie. port 8889 is used) when using a MAMP (Mac laptop) local web server (which uses localhost:8888 as its local “domain name” for http usage)) or you can keep the same code and use a URL like:

[your-domain-name-plus-a-bit-maybe]/ourmysql_storeprocedure.php?host=[your MySql host address]&username=[your MySql username]&password=[your MySql password]&database=[your optional MySql default database name within the looked up list presented]

Previous phpMyAdmin interface to MySql and PHP Primer Tutorial is relevant and shown below.

phpMyAdmin interface to MySql and PHP Primer Tutorial

You never hear much about the data when you hear about great PHP products, but we
all know it is the data that differentiates the quality of the end result.

That is probably because database products like MySql, SqlServer, Oracle SQL, Advantage and Access
are pretty good at what they do, and emphasise reliability rather than flashiness.

MySql and PHP have a great open source interface with phpMyAdmin, which is so good,
you forget that it is not the default MySql administrator’s interface product.

Let’s have a look at this WordPress database and a bit of how it looks, looking
through the prism of phpMyAdmin …

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