这篇文章主要介绍“php备份数据库代码”，在日常操作中，相信很多人在php备份数据库代码问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”php备份数据库代码”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
单表备份
代码：
复制代码 代码如下:
<?php
class Db
{
var $conn;
function Db($host="localhost",$user="root",$pass="root",$db="test")
{
if(!$this->conn=mysql_connect($host,$user,$pass))
die("can't connect to mysql sever");
mysql_select_db($db,$this->conn);
mysql_query("SET NAMES 'UTF-8'");
}
function execute($sql)
{
return mysql_query($sql,$this->conn);
}
function findCount($sql)
{
$result=$this->execute($sql);
return mysql_num_rows($result);
}
function findBySql($sql)
{
$array=array();
$result=mysql_query($sql);
$i=0;
while($row=mysql_fetch_assoc($result))
{
$array[$i]=$row;
$i++;
}
return $array;
}
//$con的几种情况
//空：返回全部记录
//array：eg. array('id'=>'1') 返回id=1的记录
//string :eg. 'id=1' 返回id=1的记录
function toExtJson($table,$start="0",$limit="10",$cons="")
{
$sql=$this->generateSql($table,$cons);
$totalNum=$this->findCount($sql);
$result=$this->findBySql($sql." LIMIT ".$start." ,".$limit);
$resultNum = count($result);//当前结果数
$str="";
$str.= "{";
$str.= "'totalCount':'$totalNum',";
$str.="'rows':";
$str.="[";
for($i=0;$i<$resultNum;$i++){
$str.="{";
$count=count($result[$i]);
$j=1;
foreach($result[$i] as $key=>$val)
{
if($j<$count)
{
$str.="'".$key."':'".$val."',";
}
elseif($j==$count)
{
$str.="'".$key."':'".$val."'";
}
$j++;
}
$str.="}";
if ($i != $resultNum-1) {
$str.= ",";
}
}
$str.="]";
$str.="}";
return $str;
}
function generateSql($table,$cons)
{
$sql="";//sql条件
$sql="select * from ".$table;
if($cons!="")
{
if(is_array($cons))
{
$k=0;
foreach($cons as $key=>$val)
{
if($k==0)
{
$sql.="where '";
$sql.=$key;
$sql.="'='";
$sql.=$val."'";
}else
{
$sql.="and '";
$sql.=$key;
$sql.="'='";
$sql.=$val."'";
}
$k++;
}
}else
{
$sql.=" where ".$cons;
}
}
return $sql;
}
function toExtXml($table,$start="0",$limit="10",$cons="")
{
$sql=$this->generateSql($table,$cons);
$totalNum=$this->findCount($sql);
$result=$this->findBySql($sql." LIMIT ".$start." ,".$limit);
$resultNum = count($result);//当前结果数
header("Content-Type: text/xml");
$xml="<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n";
$xml.="<xml>\n";
$xml.="\t<totalCount>".$totalNum."</totalCount>\n";
$xml.="\t<items>\n";
for($i=0;$i<$resultNum;$i++){
$xml.="\t\t<item>\n";
foreach($result[$i] as $key=>$val)
$xml.="\t\t\t<".$key.">".$val."</".$key.">\n";
$xml.="\t\t</item>\n";
}
$xml.="\t</items>\n";
$xml.="</xml>\n";
return $xml;
}
//输出word表格
function toWord($table,$mapping,$fileName)
{
header('Content-type: application/doc');
header('Content-Disposition: attachment; filename="'.$fileName.'.doc"');
echo '<html xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:w="urn:schemas-microsoft-com:office:word"
xmlns="[url=http://www.w3.org/TR/REC-html40]http://www.w3.org/TR/REC-html40[/url]">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>'.$fileName.'</title>
</head>
<body>';
echo'<table border=1><tr>';
if(is_array($mapping))
{
foreach($mapping as $key=>$val)
echo'<td>'.$val.'</td>';
}
echo'</tr>';
$results=$this->findBySql('select * from '.$table);
foreach($results as $result)
{
echo'<tr>';
foreach($result as $key=>$val)
echo'<td>'.$val.'</td>';
echo'</tr>';
}
echo'</table>';
echo'</body>';
echo'</html>';
}
function toExcel($table,$mapping,$fileName)
{
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition:filename=".$fileName.".xls");
echo'<html xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns="[url=http://www.w3.org/TR/REC-html40]http://www.w3.org/TR/REC-html40[/url]">
<head>
<meta http-equiv="expires" content="Mon, 06 Jan 1999 00:00:01 GMT">
<meta http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<!--[if gte mso 9]><xml>
<x:ExcelWorkbook>
<x:ExcelWorksheets>
<x:ExcelWorksheet>
<x:Name></x:Name>
<x:WorksheetOptions>
<x:DisplayGridlines/>
</x:WorksheetOptions>
</x:ExcelWorksheet>
</x:ExcelWorksheets>
</x:ExcelWorkbook>
</xml><![endif]-->
</head>
<body link=blue vlink=purple leftmargin=0 topmargin=0>';
echo'<table width="100%" border="0" cellspacing="0" cellpadding="0">';
echo'<tr>';
if(is_array($mapping))
{
foreach($mapping as $key=>$val)
echo'<td>'.$val.'</td>';
}
echo'</tr>';
$results=$this->findBySql('select * from '.$table);
foreach($results as $result)
{
echo'<tr>';
foreach($result as $key=>$val)
echo'<td>'.$val.'</td>';
echo'</tr>';
}
echo'</table>';
echo'</body>';
echo'</html>';
}
function Backup($table)
{
if(is_array ($table))
{
$str="";
foreach($table as $tab)
$str.=$this->get_table_content($tab);
return $str;
}else{
return $this->get_table_content($table);
}
}
function Backuptofile($table,$file)
{
header("Content-disposition: filename=$file.sql");//所保存的文件名
header("Content-type: application/octetstream");
header("Pragma: no-cache");
header("Expires: 0");
if(is_array ($table))
{
$str="";
foreach($table as $tab)
$str.=$this->get_table_content($tab);
echo $str;
}else{
echo $this->get_table_content($table);
}
}
function Restore($table,$file="",$content="")
{
//排除file，content都为空或者都不为空的情况
if(($file==""&&$content=="")||($file!=""&&$content!=""))
echo"参数错误";
$this->truncate($table);
if($file!="")
{
if($this->RestoreFromFile($file))
return true;
else
return false;
}
if($content!="")
{
if($this->RestoreFromContent($content))
return true;
else
return false;
}
}
//清空表，以便恢复数据
function truncate($table)
{
if(is_array ($table))
{
$str="";
foreach($table as $tab)
$this->execute("TRUNCATE TABLE $tab");
}else{
$this->execute("TRUNCATE TABLE $table");
}
}
function get_table_content($table)
{
$results=$this->findBySql("select * from $table");
$temp = "";
$crlf="<br>";
foreach($results as $result)
{
/*(";
foreach($result as $key=>$val)
{
$schema_insert .= " `".$key."`,";
}
$schema_insert = ereg_replace(",$", "", $schema_insert);
$schema_insert .= ")
*/
$schema_insert = "INSERT INTO $table VALUES (";
foreach($result as $key=>$val)
{
if($val != "")
$schema_insert .= " '".addslashes($val)."',";
else
$schema_insert .= "NULL,";
}
$schema_insert = ereg_replace(",$", "", $schema_insert);
$schema_insert .= ");$crlf";
$temp = $temp.$schema_insert ;
}
return $temp;
}
function RestoreFromFile($file){
if (false !== ($fp = fopen($file, 'r'))) {
$sql_queries = trim(fread($fp, filesize($file)));
$this->splitMySqlFile($pieces, $sql_queries);
foreach ($pieces as $query) {
if(!$this->execute(trim($query)))
return false;
}
return true;
}
return false;
}
function RestoreFromContent($content)
{
$content = trim($content);
$this->splitMySqlFile($pieces, $content);
foreach ($pieces as $query) {
if(!$this->execute(trim($query)))
return false;
}
return true;
}
function splitMySqlFile(&$ret, $sql)
{
$sql= trim($sql);
$sql=split(';',$sql);
$arr=array();
foreach($sql as $sq)
{
if($sq!="");
$arr[]=$sq;
}
$ret=$arr;
return true;
}
}
$db=new db();
// 生成 word
//$map=array('No','Name','Email','Age');
//echo $db->toWord('test',$map,'档案');
// 生成 Excel
//$map=array('No','Name','Email','Age');
//echo $db->toExcel('test',$map,'档案');
// 生成 Xml
//echo $db->toExtXml('test',0,20);
// 生成 Json
//echo $db->toExtJson('test',0,20);
//备份
//echo $db->Backuptofile('test','backup');
?>
整表备份
复制代码 代码如下:
$link = mysql_connect(DB_HOST,DB_USER,DB_PASS);
$tables = mysql_list_tables(DB_NAME);
$cachetables = array(); $tableselected = array();
while ($table = mysql_fetch_row($tables))
{
$cachetables[$table[0]] = $table[0];
$tableselected[$table[0]] = 1;
}
$table = $cachetables;
$filename = DB_NAME . "_" . date("Y_m_d_H_i_s") . ".sql";
$path = "sql/" . $filename;
$filehandle = fopen($path, "w");
$result = mysql_query("SHOW tables");
while ($currow = mysql_fetch_array($result))
{
if (isset($table[$currow[0]]))
{
sqldumptable($currow[0], $filehandle);
fwrite($filehandle, "\n\n\n");
}
}
fclose($filehandle);
$update_data = array('filename' => $filename, 'postdate' => mktime());
$db->insert('backup_db', $update_data);
// data dump functions
function sqldumptable($table, $fp = 0)
{
$tabledump = "DROP TABLE IF EXISTS " . $table . ";\n";
$result = mysql_fetch_array(mysql_query("SHOW CREATE TABLE " . $table));
//echo "SHOW CREATE TABLE $table";
$tabledump .= $result[1] . ";\r\n";
if ($fp) {
fwrite($fp, $tabledump);
} else {
echo $tabledump;
}
// get data
$rows = mysql_query("SELECT * FROM " . $table);
// $numfields=$DB->num_fields($rows);
$numfields = mysql_num_fields($rows);
while ($row = mysql_fetch_array($rows)) {
$tabledump = "INSERT INTO " . $table . " VALUES(";
$fieldcounter = -1;
$firstfield = 1;
// get each field's data
while (++$fieldcounter < $numfields) {
if (!$firstfield) {
$tabledump .= ", ";
} else {
$firstfield = 0;
}
if (!isset($row[$fieldcounter])) {
$tabledump .= "NULL";
} else {
$tabledump .= "'" . mysql_escape_string($row[$fieldcounter]) . "'";
}
}
$tabledump .= ");\n";
if ($fp) {
fwrite($fp, $tabledump);
} else {
echo $tabledump;
}
}
mysql_free_result($rows);
}
导入数据库
复制代码 代码如下:
<?php
/************
*
PHP导入.sql文件
运行版本:php5,php4 使用的时候请选择
作者:panxp
邮件:coolpan123@gmail.com
*
*************/
$file_dir = dirname(__FILE__);
$file_name = "2010-05-09-bak.sql";
$conn = mysql_connect(DB_HOST,DB_USER,DB_PASS);
mysql_select_db(DB_NAME, $conn);
/** PHP5 版本 **/
$get_sql_data = file_get_contents($file_name, $file_dir);
/**
* PHP4 版本
if(file_exists($file_dir."/".$file_name))
{
$get_sql_data = fopen($file_dir."/".$file_name,"r");
if(!$get_sql_data)
{
echo "不能打开文件";
}
else
{
$get_sql_data = fread($get_sql_data, filesize ($file_dir."/".$file_name));
}
}
***/
$explode = explode(";", $get_sql_data);
$cnt = count($explode);
for ($i=0; $i<$cnt; $i++)
{
$sql = $explode[$i];
$result = mysql_query($sql);
mysql_query("set names 'utf8'");
if ($result) {
echo "成功:".$i."个查询<br>";
} else {
echo "导入失败:".mysql_error();
}
}
?>
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