php 数据库在线备份代码
function sqldumptable($table, $fp=0) {
$tabledump = "DROP TABLE IF EXISTS $table;n";
$tabledump .= "CREATE TABLE $table (n";
$firstfield=1;
$fields = mysql_query("SHOW FIELDS FROM $table");
while ($field = mysql_fetch_array($fields)) {
if (!$firstfield) {
$tabledump .= ",n";
} else {
$firstfield=0;
}
$tabledump .= " $field[Field] $field[Type]";
if (!empty($field["Default"])) {
$tabledump .= " DEFAULT '$field[Default]'";
}
if ($field['Null'] != "YES") {
$tabledump .= " NOT NULL";
}
if ($field['Extra'] != "") {
$tabledump .= " $field[Extra]";
}
}
mysql_free_result($fields);
$keys = mysql_query("SHOW KEYS FROM $table");
while ($key = mysql_fetch_array($keys)) {
$kname=$key['Key_name'];
if ($kname != "PRIMARY" and $key['Non_unique'] == 0) {
$kname="UNIQUE|$kname";
}
if(!is_array($index[$kname])) {
$index[$kname] = array();
}
$index[$kname][] = $key['Column_name'];
}
mysql_free_result($keys);
while(list($kname, $columns) = @each($index)) {
$tabledump .= ",n";
$colnames=implode($columns,",");
if ($kname == "PRIMARY") {
$tabledump .= " PRIMARY KEY ($colnames)";
} else {
if (substr($kname,0,6) == "UNIQUE") {
$kname=substr($kname,7);
}
$tabledump .= " KEY $kname ($colnames)";
}
}
$tabledump .= "n);nn";
if ($fp) {
fwrite($fp,$tabledump);
} else {
echo $tabledump;
}
$rows = mysql_query("SELECT * FROM $table");
$numfields = mysql_num_fields($rows);
while ($row = mysql_fetch_array($rows)) {
$tabledump = "INSERT INTO $table VALUES(";
$fieldcounter=-1;
$firstfield=1;
while (++$fieldcounter
if (!$firstfield) {
$tabledump.=", ";
} else {
$firstfield=0;
}
if (!isset($row[$fieldcounter])) {
$tabledump .= "NULL";
} else {
$tabledump .= "'".mysql_escape_string($row[$fieldcounter])."'";
}
}
$tabledump .= ");n";
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if ($fp) {
fwrite($fp,$tabledump);
} else {
echo $tabledump;
}
}
mysql_free_result($rows);
}
@mysql_connect($servername,$dbusername,$dbpassword) or die("数据库连接失败");
@mysql_select_db($dbname) or die("选择数据库失败");
$table = array_flip($_POST['table']);
$result = mysql_query("SHOW tables");
echo ($result) ? NULL : "出错: ".mysql_error();
$filename = basename($_SERVER['HTTP_HOST']."_MySQL.sql");
header('Content-type: application/unknown');
header('Content-Disposition: attachment; filename='.$filename);
$mysqldata = '';
while ($currow = mysql_fetch_array($result)) {
if (isset($table[$currow[0]])) {
$mysqldata.= sqldumptable($currow[0]);
$mysqldata.= $mysqldata."rn";
}
}
mysql_close();
exit;
