WordPress/wp-admin/install-helper.php

<?php
/**
 * Plugins may load this file to gain access to special helper functions for
 * plugin installation. This file is not included by WordPress and it is
 * recommended, to prevent fatal errors, that this file is included using
 * require_once().
 *
 * These functions are not optimized for speed, but they should only be used
 * once in a while, so speed shouldn't be a concern. If it is and you are
 * needing to use these functions a lot, you might experience time outs. If you
 * do, then it is advised to just write the SQL code yourself.
 *
 * <code>
 * check_column('wp_links', 'link_description', 'mediumtext');
 * if (check_column($wpdb->comments, 'comment_author', 'tinytext'))
 *     echo "ok\n";
 *
 * $error_count = 0;
 * $tablename = $wpdb->links;
 * // check the column
 * if (!check_column($wpdb->links, 'link_description', 'varchar(255)')) {
 *     $ddl = "ALTER TABLE $wpdb->links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
 *     $q = $wpdb->query($ddl);
 * }
 *
 * if (check_column($wpdb->links, 'link_description', 'varchar(255)')) {
 *     $res .= $tablename . ' - ok <br />';
 * } else {
 *     $res .= 'There was a problem with ' . $tablename . '<br />';
 *     ++$error_count;
 * }
 * </code>
 *
 * @package WordPress
 * @subpackage Plugin
 */

/** Load WordPress Bootstrap */
require_once(dirname(dirname(__FILE__)).'/wp-load.php');

if ( ! function_exists('maybe_create_table') ) :
/**
 * Create database table, if it doesn't already exist.
 *
 * @since 1.0.0
 *
 * @uses $wpdb
 *
 * @param string $table_name Database table name.
 * @param string $create_ddl Create database table SQL.
 * @return bool False on error, true if already exists or success.
 */
function maybe_create_table($table_name, $create_ddl) {
	global $wpdb;
	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {
		if ($table == $table_name) {
			return true;
		}
	}
	//didn't find it try to create it.
	$wpdb->query($create_ddl);
	// we cannot directly tell that whether this succeeded!
	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {
		if ($table == $table_name) {
			return true;
		}
	}
	return false;
}
endif;

if ( ! function_exists('maybe_add_column') ) :
/**
 * Add column to database table, if column doesn't already exist in table.
 *
 * @since 1.0.0
 *
 * @uses $wpdb
 *
 * @param string $table_name Database table name
 * @param string $column_name Table column name
 * @param string $create_ddl SQL to add column to table.
 * @return bool False on failure. True, if already exists or was successful.
 */
function maybe_add_column($table_name, $column_name, $create_ddl) {
	global $wpdb;
	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {

		if ($column == $column_name) {
			return true;
		}
	}
	//didn't find it try to create it.
	$wpdb->query($create_ddl);
	// we cannot directly tell that whether this succeeded!
	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
		if ($column == $column_name) {
			return true;
		}
	}
	return false;
}
endif;

/**
 * Drop column from database table, if it exists.
 *
 * @since 1.0.0
 *
 * @uses $wpdb
 *
 * @param string $table_name Table name
 * @param string $column_name Column name
 * @param string $drop_ddl SQL statement to drop column.
 * @return bool False on failure, true on success or doesn't exist.
 */
function maybe_drop_column($table_name, $column_name, $drop_ddl) {
	global $wpdb;
	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
		if ($column == $column_name) {
			//found it try to drop it.
			$wpdb->query($drop_ddl);
			// we cannot directly tell that whether this succeeded!
			foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
				if ($column == $column_name) {
					return false;
				}
			}
		}
	}
	// else didn't find it
	return true;
}

/**
 * Check column matches criteria.
 *
 * Uses the SQL DESC for retrieving the table info for the column. It will help
 * understand the parameters, if you do more research on what column information
 * is returned by the SQL statement. Pass in null to skip checking that
 * criteria.
 *
 * Column names returned from DESC table are case sensitive and are listed:
 *      Field
 *      Type
 *      Null
 *      Key
 *      Default
 *      Extra
 *
 * @since 1.0.0
 *
 * @param string $table_name Table name
 * @param string $col_name Column name
 * @param string $col_type Column type
 * @param bool $is_null Optional. Check is null.
 * @param mixed $key Optional. Key info.
 * @param mixed $default Optional. Default value.
 * @param mixed $extra Optional. Extra value.
 * @return bool True, if matches. False, if not matching.
 */
function check_column($table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null) {
	global $wpdb;
	$diffs = 0;
	$results = $wpdb->get_results("DESC $table_name");

	foreach ($results as $row ) {

		if ($row->Field == $col_name) {
			// got our column, check the params
			if (($col_type != null) && ($row->Type != $col_type)) {
				++$diffs;
			}
			if (($is_null != null) && ($row->Null != $is_null)) {
				++$diffs;
			}
			if (($key != null) && ($row->Key  != $key)) {
				++$diffs;
			}
			if (($default != null) && ($row->Default != $default)) {
				++$diffs;
			}
			if (($extra != null) && ($row->Extra != $extra)) {
				++$diffs;
			}
			if ($diffs > 0) {
				return false;
			}
			return true;
		} // end if found our column
	}
	return false;
}