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PurePerl MySQL API

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Foreword: This page presents the easy to use and easy to install PurePerl MySQL Application Programming Interface, for all operating systems.

By: Chrysanthus Date Published: 29 Jan 2015

Features

PurePerl stands for Pure Perl, meaning Perl software without any C software underneath. MySQL is a database server that is used to produce databases. API stands for Application Programming Interface. API is software that is placed between two other software and facilitates communication between the two other software. The API here has been written in PurePerl. The PurePerl MySQL API is a library. It was written to provide convenience in installation and convenience in usage, which the equivalent libraries out there cannot provide.

Variables
The API has the following variables, as you will use in your script.

$Mysql::Error_msg
This will hold any error message developed from a query or some other command. The message is for the last issued command or query.
$Mysql::Message
This will hold an OK message, if present; or any other message, if present. The message is for the last issued command.
$Mysql::No_Warnings
This will hold the number of warnings the last issued command (or query) has generated.
$Mysql::affected_Rows
This is the number of records changed by a command.
$Mysql::last_insert_id
This is the last auto-incremented ID of an Insert command, where applicable.
@Mysql::Result
This is an array of hashes that will hold the result set, for queries of the SELECT nature.
@Mysql::Result_Num
This is an array similar to @Result, but it is an array of arrays, to economize memory.

$Mysql::No_of_Columns
The will hold the number of columns in a result set.
$Mysql::DB_Name
This will hold the database name for a result set
@Mysql::Column_Properties
This will hold column properties like table names and column names for a result set. It is a two-dimensional array, where one row is for one column.
$Mysql::No_of_Rows
This will hold the number of rows of a result set.

Functions
The function syntaxes as you will use in your script, and their meanings, are given below. On success a function returns 1; on failure it returns 0. Any error message or other message is got from the appropriate variable above.

The Mysql::connect("username", "password", "domain_name", port) Function
This function connects the client software to the server software.

The Mysql::select_db("database_name") Function
This function selects a new database for the client.

The Mysql::query("SQL_stmt") Function
This function takes one argument. The argument is a string, which is a MySQL SQL statement without the ending semicolon. Very many different types of SQL statement can be the argument. The result set returned is held in @Mysql::Result.

The Mysql::query_num("SQL_stmt") Function
This function is the same as the query() function, but the result set returned is held in @Mysql::Result_Num and not @Mysql::Result, to economize memory.

The Mysql::stats() Function
This function gets a human readable string of internal statistics, with a list of active threads.

The Mysql::ping() Function
This function reports whether the server is alive and reachable.

The Mysql::shutdown() Function
This function can be used by the client who has the shutdown privilege to shutdown the MySQL server.

The Mysql::close() Function
This function is used to close the connection.

The Mysql::change_user("user", "password", "databaseName") Function
While a connection is on, this function changes the user. If it fails, the connection is closed.

The Mysql::quit() Function
This function tells the server that the client wants to close the connection (end session); response: either a connection close or an acceptance to close the connection.

The Mysql::refresh(arg) Function
A low-level version of several FLUSH ... and RESET ... statements. The argument can be any of the following: REFRESH_GRANT, REFRESH_LOG, REFRESH_TABLES, REFRESH_HOSTS, REFRESH_STATUS, REFRESH_THREADS, REFRESH_SLAVE, REFRESH_MASTER, REFRESH_ALL

The debug() Function
Dump internal debug info of mysql sever to stdout.

The reset_connection() Function
This function resets the connection.

Mysql::prepare($string) Function
To prepare a statement; e.g.
my $ins = "INSERT INTO pet (name, owner, species, sex, birth, death) VALUES (?,?,'cat','f','2009-03-30',NULL)";
Mysql::prepare($ins)

Mysql::stmt_reset()
Can be used to reset the prepared statement.

Mysql::execute($values)
To execute a statement; e.g.
Mysql::execute("'Catty','Mary'")

Mysql::send_long_value("the long value", placeHolderIndex)
Use this function, before execute().

Mysql::stmt_close()
This closes the prepared statement and frees resources at the server.

Stored Procedure and Multiple Statement
Stored Procedure or Multiple statements separated by semicolons, in a query - Mysql::query("multi_stmts") -, is supported.

Transaction
PurePerl MySQL API supports transactions. - Mysql::query("transaction_stmts")

Usage
The API is easy to use. You can learn how to use it freely at:

Using the API

Discussion Group
The discussion group for this software is at:

Coding by Hand

You may have to register, free, first.

Web Development
You can learn how to use the API for web development, free of charge, from the following link:

Web Development Course with Pure Perl and MySQL

Installing
The downloaded library is in a zipped directory. You download it and you unzip it. You will then see the file, Mysql.pm and the directory, Mysql.

Installation is easy: copy the file, Mysql.pm and the directory, Mysql to the directory, C:/Perl/lib or similar of your computer. That is all! You can begin to use the API (functions and variables). Note: if you are not using the Windows Operating System, then go to the file Mysql.pm of your computer, in the installed directory, and at the top of the file, type something like, #!/usr/bin/perl pushing down the rest of the content, by one line. You should know what that statement means. Do the same for all the other files in the C:/Perl/lib/Mysql directory of your computer. Begin work!

Downloading
The library is free of charge. After reading the agreement, download it at the following link:

PurePerl MySQL API

More Related Links
Perl Mailsend
PurePerl MySQL API
Perl Course - Professional and Advanced
Major in Website Design
Web Development Course
Producing a Pure Perl Library
MySQL Course

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