| /**
* Description, this class is suitable for small web site database backup, built-in MySQL connection, simply configure the data connection
* and the location of the storage backup can be.
* Class is materialized and you can connect to the database to perform the following actions
* Get_db_table ($database) access to all data sheets
* Export_sql ($table, $subsection =0)) generates SQL files, noting that generating SQL files is only saved to the server directory and does not provide downloads
* IMPORT_SQL ($DIR) Recover data import only SQL files in the server directory
* This kind of production is simple, can spread arbitrarily, how do you have any proposal to this class, please send mail to shrimp
* @author Zhaohongjian [tian Xiao Shrimp]
* email:328742379@qq.com
* QQ Exchange Group: 69574955 Juyi Hall-Web page making hand
*/ Class Data {
Public $data _dir = "class/"; The path where the backup files are stored
Public $transfer = ""; Temporarily store sql[do not assign a value to this property, or you will generate an incorrect SQL statement. /**
* database connection
* @param string $host database host name
* @param string $user user name
* @param string $pwd Password
* @param string $db Select database name
* @param string $charset encoding
*/
&NB Sp;function connect_db ($host, $user, $pwd, $db, $charset = ' GBK ') {
if (! $conn = mysql_connect ($host, $user, $pwd) {
return false;
}
mysql_select_db ($DB);
mysql_query ("Set names $charset");
return true;
} /**
* Generate SQL statements
* @param $table The tables to be backed up
* @return $tabledump generated SQL statements
*/
Public Function Set_sql ($table, $subsection =0,& $tabledom = ') {
$tabledom. = "DROP table if exists $tablen";
$createtable = mysql_query ("Show create Table $table");
$create = Mysql_fetch_row ($createtable);
$create [1] = Str_replace ("n", "", $create [1]);
$create [1] = Str_replace ("T", "", $create [1]); $tabledom. = $create [1]. "; n "; $rows = mysql_query ("SELECT * from $table");
$numfields = Mysql_num_fields ($rows);
$numrows = mysql_num_rows ($rows);
$n = 1;
$sqlarry = Array ();
while ($row = Mysql_fetch_row ($rows)) {
$comma = "";
$tabledom. = "INSERT into $table values (";
for ($i = 0; $i < $numfields; $i + +)
{
$tabledom. = $comma. "'". Mysql_escape_string ($row [$i]). "'";
$comma = ",";
}
$tabledom. = ") n";
if ($subsection!= 0 && strlen ($this->transfer) >= $subsection *1000) {
$sqlarry [$n]= $tabledom;
$tabledom = '; $n + +;
}
}
return $sqlarry;
} /**
* Tables in the list database
* @param database $database The names of the databases to be manipulated
* @return Array $dbarray list of database tables
*/
Public Function get_db_table ($database) {
$result = Mysql_list_tables ($database);
while ($tmparry = Mysql_fetch_row ($result)) {
$dbarry [] = $tmparry [0];
}
return $dbarry;
} /**
* Verify that the directory is valid
* @param diretory $dir
* @return Booln
*/
function Check_write_dir ($dir) {
if (!is_dir ($dir)) {@mkdir ($dir, 0777);}
if (Is_dir ($dir)) {
if ($link = Opendir ($dir)) {
$filearry = Scandir ($dir);
for ($i =0; $i <count ($filearry); $i + +) {
if ($filearry [$i]!= '. ' | | $filearry!= '. ') {
@unlink ($dir. $filearry [$i]);
}
}
}
}
return true;
}
/**
* Write data to a file
* @param file $filename filename
* @param string $str the information to write
* Returns True @return Booln write success, or false
*/
Private Function Write_sql ($filename, $str) {
$re = true;
if (!@ $fp =fopen ($filename, "w+")) {$re =false echo "encountered an error opening the file, Backup failed!";}
if (! @fwrite ($FP, $str)) {$re =false echo encountered an error while writing the message, the backup failed! ";}
if (! @fclose ($fp)) {$re =false echo has encountered an error closing the file, backup failed! ";}
return $re;
} /**
* Generate SQL file
* @param string $sql SQL statement
* @param number $subsection the size of the volume, in kilobytes, 0 for non-volume
*/
Public Function Export_sql ($table, $subsection =0) {
if (! $this->check_write_dir ($this->data_dir)) {echo ' You do not have permission to manipulate directories, backup failed '; return false;}
if ($subsection = = 0) {
if (!is_array ($table)) {
$this->set_sql ($table, 0, $this->transfer);
}else{
for ($i =0; $i <count ($table); $i + +) {
$this->set_sql ($table [$i],0, $this->transfer);
}
}
$filename = $this->data_dir.date ("Ymd", Time ()). ' _all.sql ';
if (! $this->write_sql ($filename, $this->transfer)) {return false;}
}else{
if (!is_array ($table)) {
$sqlarry = $this->set_sql ($table, $subsection, $this->transfer);
$sqlarry [] = $this->transfer;
}else{
$sqlarry = Array ();
for ($i =0; $i <count ($table); $i + +) {
$tmparry = $this->set_sql ($table [$i], $subsection, $this->transfer);
$sqlarry = Array_merge ($sqlarry, $tmparry);
}
$sqlarry [] = $this->transfer;
}
for ($i =0; $i <count ($sqlarry); $i + +) {
$filename = $this->data_dir.date ("Ymd", Time ()). ' _part '. $i. '. sql ';
if (! $this->write_sql ($filename, $sqlarry [$i])) {return false;}
}
}
return true;
}
/**
* Load SQL file
* @param diretory $dir
* @return Booln
* Note: Please do not store other files or directories below the directory
* To save time for recovery
*/
Public Function Import_sql ($dir) {
if ($link = Opendir ($dir)) {
$filearry = Scandir ($dir);
$pattern = "_part[0-9]+.sql$|_all.sql$";
for ($i =0; $i <count ($filearry); $i + +) {
if (eregi ($pattern, $filearry [$i])) {
$sqls =file ($dir. $filearry [$i]);
foreach ($sqls as $sql) {
Str_replace ("R", "", $sql);
Str_replace ("n", "", $sql);
if (!mysql_query trim ($sql)) return false;
}
}
}
return true;
}
} }
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