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<?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.
 *
 *     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;
 *     }
 *
 * @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
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @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, so 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
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @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, so 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
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @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, so 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
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @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;
}

[+] ..
[+] user
[-] press-this.php [open]
[-] tools.php [open]
[-] options-head.php [open]
[-] options-discussion.php [open]
[-] ms-delete-site.php [open]
[-] theme-editor.php [open]
[-] theme-install.php [open]
[-] upgrade-functions.php [open]
[-] install.php [open]
[-] ms-admin.php [open]
[-] customize.php [open]
[-] setup-config.php [open]
[-] admin-ajax.php [open]
[-] ms-users.php [open]
[-] async-upload.php [open]
[-] privacy.php [open]
[-] link-add.php [open]
[-] edit-tag-form.php [open]
[-] media-upload.php [open]
[-] admin-footer.php [open]
[-] update.php [open]
[+] includes
[-] load-styles.php [open]
[-] plugin-editor.php [open]
[-] widgets.php [open]
[-] options.php [open]
[-] load-scripts.php [open]
[-] edit-form-advanced.php [open]
[-] nav-menus.php [open]
[-] media.php [open]
[-] plugins.php [open]
[-] link-manager.php [open]
[+] css
[-] update-core.php [open]
[-] network.php [open]
[-] plugin-install.php [open]
[-] edit-link-form.php [open]
[-] users.php [open]
[-] import.php [open]
[-] admin.php [open]
[-] edit-form-comment.php [open]
[-] ms-edit.php [open]
[-] profile.php [open]
[-] about.php [open]
[-] options-reading.php [open]
[-] themes.php [open]
[-] options-media.php [open]
[-] options-writing.php [open]
[-] media-new.php [open]
[-] link-parse-opml.php [open]
[-] post.php [open]
[-] custom-header.php [open]
[-] comment.php [open]
[-] edit-comments.php [open]
[-] ms-sites.php [open]
[-] upload.php [open]
[-] credits.php [open]
[-] user-new.php [open]
[-] install-helper.php [open]
[+] network
[-] options-permalink.php [open]
[-] ms-themes.php [open]
[-] index.php [open]
[-] menu.php [open]
[+] images
[-] menu-header.php [open]
[+] meta
[-] upgrade.php [open]
[-] admin-functions.php [open]
[-] my-sites.php [open]
[-] post-new.php [open]
[-] custom-background.php [open]
[-] ms-upgrade-network.php [open]
[-] edit-tags.php [open]
[-] revision.php [open]
[-] term.php [open]
[-] admin-header.php [open]
[-] link.php [open]
[-] admin-post.php [open]
[-] ms-options.php [open]
[+] js
[-] options-general.php [open]
[-] export.php [open]
[-] freedoms.php [open]
[+] maint
[-] moderation.php [open]
[-] user-edit.php [open]
[-] edit.php [open]