PHP DatabaseBase::indexExists方法代码示例

 /**
  * Rename an index from an existing table
  *
  * @param string $table Name of the table to modify
  * @param string $oldIndex Old name of the index
  * @param string $newIndex New name of the index
  * @param bool $skipBothIndexExistWarning Whether to warn if both the
  * old and the new indexes exist.
  * @param string $patch Path to the patch file
  * @param bool $fullpath Whether to treat $patch path as a relative or not
  * @return bool False if this was skipped because schema changes are skipped
  */
 protected function renameIndex($table, $oldIndex, $newIndex, $skipBothIndexExistWarning, $patch, $fullpath = false)
 {
     if (!$this->doTable($table)) {
         return true;
     }
     // First requirement: the table must exist
     if (!$this->db->tableExists($table, __METHOD__)) {
         $this->output("...skipping: '{$table}' table doesn't exist yet.\n");
         return true;
     }
     // Second requirement: the new index must be missing
     if ($this->db->indexExists($table, $newIndex, __METHOD__)) {
         $this->output("...index {$newIndex} already set on {$table} table.\n");
         if (!$skipBothIndexExistWarning && $this->db->indexExists($table, $oldIndex, __METHOD__)) {
             $this->output("...WARNING: {$oldIndex} still exists, despite it has " . "been renamed into {$newIndex} (which also exists).\n" . "            {$oldIndex} should be manually removed if not needed anymore.\n");
         }
         return true;
     }
     // Third requirement: the old index must exist
     if (!$this->db->indexExists($table, $oldIndex, __METHOD__)) {
         $this->output("...skipping: index {$oldIndex} doesn't exist.\n");
         return true;
     }
     // Requirements have been satisfied, patch can be applied
     return $this->applyPatch($patch, $fullpath, "Renaming index {$oldIndex} into {$newIndex} to table {$table}");
 }

 /**
  * Drop an index from an existing table
  *
  * @param $table String: Name of the table to modify
  * @param $index String: Name of the old index
  * @param $patch String: Path to the patch file
  * @param $fullpath Boolean: Whether to treat $patch path as a relative or not
  */
 protected function dropIndex($table, $index, $patch, $fullpath = false)
 {
     if ($this->db->indexExists($table, $index, __METHOD__)) {
         $this->applyPatch($patch, $fullpath, "Dropping {$index} index from table {$table}");
     } else {
         $this->output("...{$index} key doesn't exist.\n");
     }
 }

 /**
  * (MySQL only) Drops fulltext index before populating the table.
  */
 private function dropMysqlTextIndex()
 {
     $searchindex = $this->db->tableName('searchindex');
     if ($this->db->indexExists('searchindex', 'si_title', __METHOD__)) {
         $this->output("Dropping index...\n");
         $sql = "ALTER TABLE {$searchindex} DROP INDEX si_title, DROP INDEX si_text";
         $this->db->query($sql, __METHOD__);
     }
 }