Спасибо @nlaq за код, с которого я начал работать над приведенным ниже решением.
Я выпустил плагин для WordPress, не понимая, что WordPress не устанавливает параметры сортировки автоматически. Так что многие люди, использующие плагин, получили latin1_swedish_ci, когда он должен был быть utf8_general_ci.
Вот код, который я добавил в плагин, чтобы обнаружить шаблон latin1_swedish_ci и изменить его на utf8_general_ci.
Протестируйте этот код, прежде чем использовать его в своем плагине!
// list the names of your wordpress plugin database tables (without db prefix)
$tables_to_check = array(
'social_message',
'social_facebook',
'social_facebook_message',
'social_facebook_page',
'social_google',
'social_google_mesage',
'social_twitter',
'social_twitter_message',
);
// choose the collate to search for and replace:
$convert_fields_collate_from = 'latin1_swedish_ci';
$convert_fields_collate_to = 'utf8_general_ci';
$convert_tables_character_set_to = 'utf8';
$show_debug_messages = false;
global $wpdb;
$wpdb->show_errors();
foreach($tables_to_check as $table) {
$table = $wpdb->prefix . $table;
$indicies = $wpdb->get_results( "SHOW INDEX FROM `$table`", ARRAY_A );
$results = $wpdb->get_results( "SHOW FULL COLUMNS FROM `$table`" , ARRAY_A );
foreach($results as $result){
if($show_debug_messages)echo "Checking field ".$result['Field'] ." with collat: ".$result['Collation']."\n";
if(isset($result['Field']) && $result['Field'] && isset($result['Collation']) && $result['Collation'] == $convert_fields_collate_from){
if($show_debug_messages)echo "Table: $table - Converting field " .$result['Field'] ." - " .$result['Type']." - from $convert_fields_collate_from to $convert_fields_collate_to \n";
// found a field to convert. check if there's an index on this field.
// we have to remove index before converting field to binary.
$is_there_an_index = false;
foreach($indicies as $index){
if ( isset($index['Column_name']) && $index['Column_name'] == $result['Field']){
// there's an index on this column! store it for adding later on.
$is_there_an_index = $index;
$wpdb->query( $wpdb->prepare( "ALTER TABLE `%s` DROP INDEX %s", $table, $index['Key_name']) );
if($show_debug_messages)echo "Dropped index ".$index['Key_name']." before converting field.. \n";
break;
}
}
$set = false;
if ( preg_match( "/^varchar\((\d+)\)$/i", $result['Type'], $mat ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` VARBINARY({$mat[1]})" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` VARCHAR({$mat[1]}) CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
} else if ( !strcasecmp( $result['Type'], "CHAR" ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` BINARY(1)" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` VARCHAR(1) CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
} else if ( !strcasecmp( $result['Type'], "TINYTEXT" ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` TINYBLOB" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` TINYTEXT CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
} else if ( !strcasecmp( $result['Type'], "MEDIUMTEXT" ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` MEDIUMBLOB" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` MEDIUMTEXT CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
} else if ( !strcasecmp( $result['Type'], "LONGTEXT" ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` LONGBLOB" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` LONGTEXT CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
} else if ( !strcasecmp( $result['Type'], "TEXT" ) ) {
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` BLOB" );
$wpdb->query( "ALTER TABLE `{$table}` MODIFY `{$result['Field']}` TEXT CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
$set = true;
}else{
if($show_debug_messages)echo "Failed to change field - unsupported type: ".$result['Type']."\n";
}
if($set){
if($show_debug_messages)echo "Altered field success! \n";
$wpdb->query( "ALTER TABLE `$table` MODIFY {$result['Field']} COLLATE $convert_fields_collate_to" );
}
if($is_there_an_index !== false){
// add the index back.
if ( !$is_there_an_index["Non_unique"] ) {
$wpdb->query( "CREATE UNIQUE INDEX `{$is_there_an_index['Key_name']}` ON `{$table}` ({$is_there_an_index['Column_name']})", $is_there_an_index['Key_name'], $table, $is_there_an_index['Column_name'] );
} else {
$wpdb->query( "CREATE UNIQUE INDEX `{$is_there_an_index['Key_name']}` ON `{$table}` ({$is_there_an_index['Column_name']})", $is_there_an_index['Key_name'], $table, $is_there_an_index['Column_name'] );
}
}
}
}
// set default collate
$wpdb->query( "ALTER TABLE `{$table}` DEFAULT CHARACTER SET {$convert_tables_character_set_to} COLLATE {$convert_fields_collate_to}" );
if($show_debug_messages)echo "Finished with table $table \n";
}
$wpdb->hide_errors();