update_convert_table_utf8

• Drupal 4.7
• Drupal 5

Versions

4.7 – 5

update_convert_table_utf8($table)

Convert a single MySQL table to UTF-8.

We change all text columns to their corresponding binary type, then back to text, but with a UTF-8 character set. See: http://dev.mysql.com/doc/refman/4.1/en/charset-conversion.html

Code

./update.php, line 615

<?php
function update_convert_table_utf8($table) {
  $ret = array();
  $types = array('char' => 'binary',
                 'varchar' => 'varbinary',
                 'tinytext' => 'tinyblob',
                 'text' => 'blob',
                 'mediumtext' => 'mediumblob',
                 'longtext' => 'longblob');

  // Get next table in list
  $convert_to_binary = array();
  $convert_to_utf8 = array();

  // Set table default charset
  $ret[] = update_sql('ALTER TABLE {'. $table .'} DEFAULT CHARACTER SET utf8');

  // Find out which columns need converting and build SQL statements
  $result = db_query('SHOW FULL COLUMNS FROM {'. $table .'}');
  while ($column = db_fetch_array($result)) {
    list($type) = explode('(', $column['Type']);
    if (isset($types[$type])) {
      $names = 'CHANGE `'. $column['Field'] .'` `'. $column['Field'] .'` ';
      $attributes = ' DEFAULT '. ($column['Default'] == 'NULL' ? 'NULL ' :
                     "'". db_escape_string($column['Default']) ."' ") .
                    ($column['Null'] == 'YES' ? 'NULL' : 'NOT NULL');

      $convert_to_binary[] = $names . preg_replace('/'. $type .'/i', $types[$type], $column['Type']) . $attributes;
      $convert_to_utf8[] = $names . $column['Type'] .' CHARACTER SET utf8'. $attributes;
    }
  }

  if (count($convert_to_binary)) {
    // Convert text columns to binary
    $ret[] = update_sql('ALTER TABLE {'. $table .'} '. implode(', ', $convert_to_binary));
    // Convert binary columns to UTF-8
    $ret[] = update_sql('ALTER TABLE {'. $table .'} '. implode(', ', $convert_to_utf8));
  }
  return $ret;
}
?>

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