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Have dbDelta() loop through tables it knows about, rather than loop through a potentially expensive and definitely unnecessary SHOW TABLES. fixes #17998. 

git-svn-id: http://svn.automattic.com/wordpress/trunk@19040 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
nacin 2011-10-21 22:35:33 +00:00
parent 7a3fc7d36c
commit 870d7860fd
1 changed files with 16 additions and 21 deletions
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37
wp-admin/includes/upgrade.php
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@ -1459,21 +1459,24 @@ function dbDelta( $queries = '', $execute = true ) {
$cqueries = apply_filters( 'dbdelta_create_queries', $cqueries );
$iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries );
// Check to see which tables and fields exist
if ($tables = $wpdb->get_col('SHOW TABLES;')) {
// For every table in the database
$global_tables = $wpdb->tables( 'global' );
foreach ($tables as $table) {
// Upgrade global tables only for the main site. Don't upgrade at all if DO_NOT_UPGRADE_GLOBAL_TABLES is defined.
if ( in_array( $table, $global_tables ) && ( !is_main_site() || defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) )
continue;
$global_tables = $wpdb->tables( 'global' );
foreach ( $cqueries as $table => $qry ) {
// Upgrade global tables only for the main site. Don't upgrade at all if DO_NOT_UPGRADE_GLOBAL_TABLES is defined.
if ( in_array( $table, $global_tables ) && ( !is_main_site() || defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) )
continue;
// Fetch the table column structure from the database
$wpdb->suppress_errors();
$tablefields = $wpdb->get_results("DESCRIBE {$table};");
$wpdb->suppress_errors( false );
if ( ! $tablefields )
continue;
// If a table query exists for the database table...
if ( array_key_exists(strtolower($table), $cqueries) ) {
// Clear the field and index arrays
$cfields = $indices = array();
// Get all of the field names in the query from between the parens
preg_match("|\((.*)\)|ms", $cqueries[strtolower($table)], $match2);
preg_match("|\((.*)\)|ms", $qry, $match2);
$qryline = trim($match2[1]);
// Separate field lines into an array
@ -1508,9 +1511,6 @@ function dbDelta( $queries = '', $execute = true ) {
}
}
// Fetch the table column structure from the database
$tablefields = $wpdb->get_results("DESCRIBE {$table};");
// For every field in the table
foreach ($tablefields as $tablefield) {
// If the table field exists in the field array...
@ -1607,13 +1607,8 @@ function dbDelta( $queries = '', $execute = true ) {
$for_update[$table.'.'.$fieldname] = 'Added index '.$table.' '.$index;
}
// Remove the original table creation query from processing
unset($cqueries[strtolower($table)]);
unset($for_update[strtolower($table)]);
} else {
// This table exists in the database, but not in the creation queries?
}
}
// Remove the original table creation query from processing
unset( $cqueries[ $table ], $for_update[ $table ] );
}
$allqueries = array_merge($cqueries, $iqueries);