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# LXXXVIII. mSQL Functions

# Introduction

These functions allow you to access mSQL database servers. More information about mSQL can be found at http://www.hughes.com.au/.

# Installation

In order to have these functions available, you must compile PHP with msql support by using the --with-msql[=DIR] option. DIR is the mSQL base install directory, defaults to `/usr/local/msql3`.

> Note to Win32 Users: In order to enable this module on a Windows environment, you must copy `msql.dll` from the DLL folder of the PHP/Win32 binary package to the SYSTEM32 folder of your windows machine. (Ex: `C:\WINNT\SYSTEM32` or `C:\WINDOWS\SYSTEM32`)

# Runtime Configuration

The behaviour of these functions is affected by settings in `php.ini`.

Table 1. mSQL configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
msql.allow_persistent | "1" | PHP_INI_ALL |
msql.max_persistent | "-1" | PHP_INI_ALL |
msql.max_links | "-1" | PHP_INI_ALL |

For further details and definitions of the PHP_INI_* constants, see the Appendix G.

Here's a short explanation of the configuration directives.

msql.allow_persistent boolean

  Whether to allow persistent mSQL connections.

msql.max_persistent integer

  The maximum number of persistent mSQL connections per process.

msql.max_links integer

  The maximum number of mSQL connections per process, including persistent connections.

# Resource Types

There are two resource types used in the mSQL module. The first one is the link identifier for a database connection, the second a resource which holds the result of a query.

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`MSQL_ASSOC` (integer)

`MSQL_NUM` (integer)

`MSQL_BOTH` (integer)

# Examples

This simple example shows how to connect, execute a query, print resulting rows and disconnect from a mSQL database.

Example 1. mSQL usage example
`<?php /* Connecting, selecting database */ $link = msql_connect('localhost', 'username', 'password') or die('Could not connect : ' . msql_error($link)); msql_select_db('database', $link) or die('Could not select database'); /* Issue SQL query */ $query = 'SELECT * FROM my_table'; $result = msql_query($query, $link) or die('Query failed : ' . msql_error($link)); /* Printing results in HTML */ echo "<table>\n"; while ($row = msql_fetch_array($result, MSQL_ASSOC)) { echo "\t<tr>\n"; foreach ($row as $col_value) { echo "\t\t<td>$col_value</td>\n"; } echo "\t</tr>\n"; } echo "</table>\n"; /* Free result set */ msql_free_result($result); /* Close connection */ msql_close($link); ?>`

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