原文在http://bingu.net/472/latin1_swedish_ci-to-utf8_general_ci/

把下列文件保存为一个.php文件，然后运行

<?php

define('DB_NAME', 'putyourdbnamehere'); // 数据库名

define('DB_USER', 'usernamehere'); // MySQL用户名

define('DB_PASSWORD', 'yourpasswordhere'); // 密码

define('DB_HOST', 'localhost'); // 很大可能你无需修改此项

function UTF8_DB_Converter_DoIt() {

$tables = array();

$tables_with_fields = array();

// Since we cannot use the WordPress Database Abstraction Class (wp-db.php),

// we have to make an a stand-alone/direct connection to the database.

$link_id = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or die('Error establishing a database connection');

mysql_select_db(DB_NAME, $link_id);

// Gathering information about tables and all the text/string fields that can be affected

// during the conversion to UTF-8.

$resource = mysql_query("SHOW TABLES", $link_id);

while ( $result = mysql_fetch_row($resource) )

$tables[] = $result[0];

if ( !empty($tables) ) {

foreach ( (array) $tables as $table ) {

$resource = mysql_query("EXPLAIN $table", $link_id);

while ( $result = mysql_fetch_assoc($resource) ) {

if ( preg_match('/(char)|(text)|(enum)|(set)/', $result['Type']) )

$tables_with_fields[$table][$result['Field']] = $result['Type'] . " " . ( "YES" == $result['Null'] ? "" : "NOT " ) . "NULL " . ( !is_null($result['Default']) ? "DEFAULT '". $result['Default'] ."'" : "" );

}

}

// Change all text/string fields of the tables to their corresponding binary text/string representations.

foreach ( (array) $tables as $table )

mysql_query("ALTER TABLE $table CONVERT TO CHARACTER SET binary", $link_id);

// Change database and tables to UTF-8 Character set.

mysql_query("ALTER DATABASE " . DB_NAME . " CHARACTER SET utf8", $link_id);

foreach ( (array) $tables as $table )

mysql_query("ALTER TABLE $table CONVERT TO CHARACTER SET utf8", $link_id);

// Return all binary text/string fields previously changed to their original representations.

foreach ( (array) $tables_with_fields as $table => $fields ) {

foreach ( (array) $fields as $field_type => $field_options ) {

mysql_query("ALTER TABLE $table MODIFY $field_type $field_options", $link_id);

}

}

// Optimize tables and finally close the mysql link.

foreach ( (array) $tables as $table )

mysql_query("OPTIMIZE TABLE $table", $link_id);

mysql_close($link_id);

} else {

die('<strong>There are no tables?</strong>');

}

return true;

}

UTF8_DB_Converter_DoIt();

?>