code: protected function loadTableSchema($name)
      {
          $pdo = $this->db->getSlavePdo();
  
          $tableInfo = $pdo->cubrid_schema(\PDO::CUBRID_SCH_TABLE, $name);
  
          if (!isset($tableInfo[0]['NAME'])) {
              return null;
          }
  
          $table = new TableSchema();
          $table->fullName = $table->name = $tableInfo[0]['NAME'];
  
          $sql = 'SHOW FULL COLUMNS FROM ' . $this->quoteSimpleTableName($table->name);
          $columns = $this->db->createCommand($sql)->queryAll();
  
          foreach ($columns as $info) {
              $column = $this->loadColumnSchema($info);
              $table->columns[$column->name] = $column;
          }
  
          $primaryKeys = $pdo->cubrid_schema(\PDO::CUBRID_SCH_PRIMARY_KEY, $table->name);
          foreach ($primaryKeys as $key) {
              $column = $table->columns[$key['ATTR_NAME']];
              $column->isPrimaryKey = true;
              $table->primaryKey[] = $column->name;
              if ($column->autoIncrement) {
                  $table->sequenceName = '';
              }
          }
  
          $foreignKeys = $pdo->cubrid_schema(\PDO::CUBRID_SCH_IMPORTED_KEYS, $table->name);
          foreach ($foreignKeys as $key) {
              if (isset($table->foreignKeys[$key['FK_NAME']])) {
                  $table->foreignKeys[$key['FK_NAME']][$key['FKCOLUMN_NAME']] = $key['PKCOLUMN_NAME'];
              } else {
                  $table->foreignKeys[$key['FK_NAME']] = [
                      $key['PKTABLE_NAME'],
                      $key['FKCOLUMN_NAME'] => $key['PKCOLUMN_NAME'],
                  ];
              }
          }
  
          return $table;
      }
docs: {@inheritdoc}