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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.
*
* <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
* @package WordPress
* @subpackage Plugin
* @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
* @package WordPress
* @subpackage Plugin
* @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
* @package WordPress
* @subpackage Plugin
* @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
* @package WordPress
* @subpackage Plugin
*
* @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;
}