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备份,恢复数据库
Dec 23, 2009 10:53:21 PM | Comments(1) | Category:PHP学习 | Tags:备份 恢复数据库
<?php
/*备份数据库,参数$tables如果手工设定地话,不需要给出表前缀
$dbname 数据库名字
$bakfile可以不指定(备份在PHP程序同一目录下),
也可以是一个目录(自动生成个文件名备份在此目录下),也可以是一个包含路径的文件名
*/
public function backup($bakupFile = null, $tables = array())
{
if (empty($bakupFile)) {
$backupFile = $this->dbname . date("Ymdhis") . '.sql';
} elseif (is_dir($backupFile)) { //判断$backupFile是否为目录
if (preg_match('/\/$/', $backupFile)) { //如果$backupFile 的格式为 "目录名/"
$backupFile = $backupFile . $this->dbname . date("Ymdhis") . '.sql';
} else {
$backupFile = $backupFile . '/' . $this->dbname . date("Ymdhis") . '.sql';
}
}
if (!$tables) { //如果数组 $tables为空,则备份所有表
$this->query("SHOW TABLES");
while ($row = mysql_fetch_row($this->queryID)) {
$tables[] = $row[0];
}
} else {
foreach ($tables as $k => $v) {
$tables[$k] = $this->tablePrefix . $v;
}
}
if ($fp = fopen($bakfile, 'wb')) {
if ($this->dbcharset) { //是否设置了数据库的编码格式
fwrite($fp, "SET NAMES " . $this->dbcharset . ";\n\n");
}
foreach ($tables as $table) {
$this->dumpTable($table, $fp); //备份表
fwrite($fp, "\n");
}//foreach
fclose($fp);
return true;
} else {
return false;
}//if
}
//私有方法 导出表格
protected function dumpTable($table, $fp)
{
//备份表结构
//fwrite($fp, "-- \n-- {$table}\n-- \n");
$row = $this->findBySql("SHOW CREATE TABLE `{$table}`");
fwrite($fp, str_replace("\n","", $row['Create Table']) . ";\n\n" );
//备份表数据
$this->query("SELECT * FROM `{$table}`");
while ($row = mysql_fetch_assoc($this->queryID)) {
foreach ($row as $k=>$v) {
$row[$k] = "'" . $this->qstr($v) . "'" ; //用mysql_real_escape_string 转义字符
}
$sql = "INSERT INTO `$table` VALUES (" . join(",", $row) . ");\n";
fwrite($fp, $sql);
}
mysql_free_result($this->queryID);
fwrite($fp, "\n");
}
//恢复数据库文件
public function restore($bakfile)
{
if ($fp = fopen($bakfile, 'r')) {
$sql = '';
while (!feof($fp)) {
$line = fgets($fp);
if (strpos($line,'--')!==0)
{
$sql .= $line;
//pp($sql);
}
if (preg_match('/;\s*$/', $sql)) {
$this->query($sql);
$sql = '';
}
}
fclose($fp);
return true;
} else {
return false;
}
}
?>
/*备份数据库,参数$tables如果手工设定地话,不需要给出表前缀
$dbname 数据库名字
$bakfile可以不指定(备份在PHP程序同一目录下),
也可以是一个目录(自动生成个文件名备份在此目录下),也可以是一个包含路径的文件名
*/
public function backup($bakupFile = null, $tables = array())
{
if (empty($bakupFile)) {
$backupFile = $this->dbname . date("Ymdhis") . '.sql';
} elseif (is_dir($backupFile)) { //判断$backupFile是否为目录
if (preg_match('/\/$/', $backupFile)) { //如果$backupFile 的格式为 "目录名/"
$backupFile = $backupFile . $this->dbname . date("Ymdhis") . '.sql';
} else {
$backupFile = $backupFile . '/' . $this->dbname . date("Ymdhis") . '.sql';
}
}
if (!$tables) { //如果数组 $tables为空,则备份所有表
$this->query("SHOW TABLES");
while ($row = mysql_fetch_row($this->queryID)) {
$tables[] = $row[0];
}
} else {
foreach ($tables as $k => $v) {
$tables[$k] = $this->tablePrefix . $v;
}
}
if ($fp = fopen($bakfile, 'wb')) {
if ($this->dbcharset) { //是否设置了数据库的编码格式
fwrite($fp, "SET NAMES " . $this->dbcharset . ";\n\n");
}
foreach ($tables as $table) {
$this->dumpTable($table, $fp); //备份表
fwrite($fp, "\n");
}//foreach
fclose($fp);
return true;
} else {
return false;
}//if
}
//私有方法 导出表格
protected function dumpTable($table, $fp)
{
//备份表结构
//fwrite($fp, "-- \n-- {$table}\n-- \n");
$row = $this->findBySql("SHOW CREATE TABLE `{$table}`");
fwrite($fp, str_replace("\n","", $row['Create Table']) . ";\n\n" );
//备份表数据
$this->query("SELECT * FROM `{$table}`");
while ($row = mysql_fetch_assoc($this->queryID)) {
foreach ($row as $k=>$v) {
$row[$k] = "'" . $this->qstr($v) . "'" ; //用mysql_real_escape_string 转义字符
}
$sql = "INSERT INTO `$table` VALUES (" . join(",", $row) . ");\n";
fwrite($fp, $sql);
}
mysql_free_result($this->queryID);
fwrite($fp, "\n");
}
//恢复数据库文件
public function restore($bakfile)
{
if ($fp = fopen($bakfile, 'r')) {
$sql = '';
while (!feof($fp)) {
$line = fgets($fp);
if (strpos($line,'--')!==0)
{
$sql .= $line;
//pp($sql);
}
if (preg_match('/;\s*$/', $sql)) {
$this->query($sql);
$sql = '';
}
}
fclose($fp);
return true;
} else {
return false;
}
}
?>