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Add checks for existing columns before trying to make DB/table updates #22

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Add checks for existing columns before trying to make DB/table updates #22

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26 changes: 22 additions & 4 deletions wp-rest-cache.php
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Original file line number Diff line number Diff line change
Expand Up @@ -251,8 +251,16 @@ protected static function maybe_upgrade_table() {
if ( ! $table_version || 2 == (int) $table_version ) {
// Version 2 adds a `rest_status_code` column to the table.
global $wpdb;
$query1 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` ADD `rest_status_code` VARCHAR(3) COLLATE utf8_unicode_ci NOT NULL DEFAULT '200' AFTER `rest_args`;" );
$query2 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` ADD `rest_key` VARCHAR(65) COLLATE utf8_unicode_ci NOT NULL AFTER `rest_md5`;" );
// Check to see if the columns already exist before attempting to add them in
$query1 = $wpdb->query( "SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='{$wpdb->dbname}' AND TABLE_NAME = '{$wpdb->rest_cache}' AND COLUMN_NAME='rest_status_code';" );
if ( 1 != $query1 ) {
$query1 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` ADD `rest_status_code` VARCHAR(3) COLLATE utf8_unicode_ci NOT NULL DEFAULT '200' AFTER `rest_args`;" );
}

$query2 = $wpdb->query( "SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='{$wpdb->dbname}' AND TABLE_NAME = '{$wpdb->rest_cache}' AND COLUMN_NAME='rest_key';" );
if ( 1 != $query2 ) {
$query2 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` ADD `rest_key` VARCHAR(65) COLLATE utf8_unicode_ci NOT NULL AFTER `rest_md5`;" );
}

if ( $query1 && $query2 ) {
update_site_option( self::$table_version_key, '3' );
Expand All @@ -267,8 +275,18 @@ protected static function maybe_upgrade_table() {
if ( 2 == (int) $table_version ) {
// Version 3 adds a `status_code` column to the table.
global $wpdb;
$query1 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` DROP COLUMN `status_code`;" );
$query2 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` DROP COLUMN `key`" );

// Only attempt to drop the columns if they're currently in the table.
// The check handles edge cases where the site option might not have properly updated.
$query1 = $wpdb->query( "SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='{$wpdb->dbname}' AND TABLE_NAME = '{$wpdb->rest_cache}' AND COLUMN_NAME='status_code';" );
if ( 1 == $query1 ) {
$query1 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` DROP COLUMN `status_code`;" );
}

$query2 = $wpdb->query( "SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='{$wpdb->dbname}' AND TABLE_NAME = '{$wpdb->rest_cache}' AND COLUMN_NAME='key';" );
if ( 1 == $query2 ) {
$query2 = $wpdb->query( "ALTER TABLE `{$wpdb->rest_cache}` DROP COLUMN `key`" );
}

if ( $query1 && $query2 ) {
update_site_option( self::$table_version_key, '3' );
Expand Down