/**
  * Creates and returns SQL command for dropping the sequence.
  *
  * @return string
  */
 public static function get_drop_sql($node_schema, $node_sequences)
 {
     $table_name = mysql5::get_quoted_table_name(self::TABLE_NAME);
     $seq_col = mysql5::get_quoted_column_name(self::SEQ_COL);
     $sequences = dbx::to_array($node_sequences);
     if (count($sequences) === 0) {
         return '';
     }
     $sequence_names = "('" . implode("', '", array_map(function ($n) {
         if ($n instanceof SimpleXMLElement) {
             return $n['name'];
         }
         return $n;
     }, $sequences)) . "')";
     return "DELETE FROM {$table_name} WHERE {$seq_col} IN {$sequence_names};";
 }
 private static function diff_single($ofs, $old_seq, $new_seq)
 {
     $sql = array();
     if (!dbsteward::$ignore_oldnames && !empty($new_seq['oldSequenceName'])) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::SEQ_COL) . " = '{$new_seq['name']}'";
     }
     if ($new_seq['inc'] == null && $old_seq['inc'] != null) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::INC_COL) . ' = DEFAULT';
     }
     if ($new_seq['inc'] != null && strcasecmp($new_seq['inc'], $old_seq['inc']) != 0) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::INC_COL) . ' = ' . $new_seq['inc'];
     }
     if ($new_seq['min'] == null && $old_seq['min'] != null) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::MIN_COL) . ' = DEFAULT';
     } elseif ($new_seq['min'] != null && strcasecmp($new_seq['min'], $old_seq['min']) != 0) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::MIN_COL) . ' = ' . $new_seq['min'];
     }
     if ($new_seq['max'] == null && $old_seq['max'] != null) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::MAX_COL) . ' = DEFAULT';
     } elseif ($new_seq['max'] != null && strcasecmp($new_seq['max'], $old_seq['max']) != 0) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::MAX_COL) . ' = ' . $new_seq['max'];
     }
     if ($new_seq['start'] != null && strcasecmp($new_seq['start'], $old_seq['start']) != 0) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::CUR_COL) . ' = ' . $new_seq['start'];
     }
     if ($new_seq['cycle'] == null && $old_seq['cycle'] != null) {
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::CYC_COL) . ' = DEFAULT';
     } elseif ($new_seq['cycle'] != null && strcasecmp($new_seq['cycle'], $old_seq['cycle']) != 0) {
         $value = strcasecmp($new_seq['cycle'], 'false') == 0 ? 'FALSE' : 'TRUE';
         $sql[] = mysql5::get_quoted_column_name(mysql5_sequence::CYC_COL) . ' = ' . $value;
     }
     if (!empty($sql)) {
         $out = "UPDATE " . mysql5::get_quoted_table_name(mysql5_sequence::TABLE_NAME);
         $out .= "\nSET " . implode(",\n    ", $sql);
         $out .= "\nWHERE " . mysql5::get_quoted_column_name(mysql5_sequence::SEQ_COL) . " = ";
         $out .= "'" . $old_seq['name'] . "'";
         $ofs->write("{$out};\n");
     }
 }