使用表之间的键连接上传数据库时出现问题。
只要表之间没有连接，脚本就可以很好地工作。
我必须在我的 php 类中包含哪些 MySql 命令才能删除所有外键？所以我可以删除表，然后在创建所有表后将键连接重新添加到表中。
这是我正在使用的课程：
<?php
class BackupDB
{
private $host = '';
private $username = '';
private $passwd = '';
private $dbName = '';
private $charset = '';
function __construct($host, $username, $passwd, $dbName, $charset = 'utf8')
{
$this->host = $host;
$this->username = $username;
$this->passwd = $passwd;
$this->dbName = $dbName;
$this->charset = $charset;
$this->initializeDatabase();
}
protected
function initializeDatabase()
{
$conn = mysql_connect($this->host, $this->username, $this->passwd);
mysql_select_db($this->dbName, $conn);
if (!mysql_set_charset($this->charset, $conn))
{
mysql_query('SET NAMES ' . $this->charset);
}
}
/**
* Backup the whole database or just some tables
* Use '*' for whole database or 'table1 table2 table3...'
* @param string $tables
*/
public
function backupTables($tables = '*', $outputDir = '.')
{
try
{
/**
* Tables to export
*/
if ($tables == '*')
{
$tables = array();
$result = mysql_query('SHOW TABLES');
while ($row = mysql_fetch_row($result))
{
$tables[] = $row[0];
}
}
else
{
$tables = is_array($tables) ? $tables : explode(',', $tables);
}
$sql = 'CREATE DATABASE IF NOT EXISTS ' . $this->dbName . ";\n\n";
$sql.= 'USE ' . $this->dbName . ";\n\n";
/**
* Iterate tables
*/
foreach($tables as $table)
{
echo "Backing up " . $table . " table...";
$result = mysql_query('SELECT * FROM ' . $table);
$numFields = mysql_num_fields($result);
$sql.= 'DROP TABLE IF EXISTS ' . $table . ';';
$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE ' . $table));
$sql.= "\n\n" . $row2[1] . ";\n\n";
for ($i = 0; $i < $numFields; $i++)
{
while ($row = mysql_fetch_row($result))
{
$sql.= 'INSERT INTO ' . $table . ' VALUES(';
for ($j = 0; $j < $numFields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n", "\\n", $row[$j]);
if (isset($row[$j]))
{
$sql.= '"' . $row[$j] . '"';
}
else
{
$sql.= '""';
}
if ($j < ($numFields - 1))
{
$sql.= ',';
}
}
$sql.= ");\n";
}
}
$sql.= "\n\n\n";
echo " OK" . "<br />";
}
}
catch(Exception $e)
{
var_dump($e->getMessage());
return false;
}
return $this->saveFile($sql, $outputDir);
}
/**
* Save SQL to file
* @param string $sql
*/
protected
function saveFile(&$sql, $outputDir = '.')
{
if (!$sql) return false;
try
{
$outputfilename = $outputDir . '/db-backup-' . $this->dbName . '-' . date("d.m.Y_H.i.s") . '.sql';
$result = mysql_query('INSERT INTO backuplog (backup) VALUES ("' . $outputfilename . '")');
$handle = fopen($outputfilename, 'w+');
fwrite($handle, $sql);
fclose($handle);
echo '<span class="message">Zapisano ' . $outputfilename . ' link do bazy. </span>';
echo '<span class="message">Właśnie pobrano kopie zapasową. Dziękujemy Serdecznie. Życzymy miłego dnia.</span>';
}
catch(Exception $e)
{
$result = mysql_query('DELETE FROM backuplog WHERE backup ="' . $outputfilename . '"');
var_dump($e->getMessage());
echo '<span class="error">Notacja.Udało się pobrać bazedanych... ale #NIE zaladowano linku do formularza, aby odzyskać dane trzeba ręcznie wpisać nazwę folderu/orazpliku.sql</span>';
echo '<span class="error">UWAGA! Wystąpił błąd podczas zapisywania danych w bazie... Zadanie nie ukończone.</span>';
return false;
}
return true;
} //end f
public
function loadDB($filename)
{
// $result=exec('mysql --user='.$this->user.' --password='.$this->pass .'<DatabaseBackUp/'.$filename);
// mysql -u user_name -p <file_to_read_from.sql
$templine = '';
// Read in entire file
$lines = file($filename);
// Loop through each line
foreach($lines as $line)
{
// Skip it if it's a comment
if (substr($line, 0, 2) == '--' || $line == '') continue;
// Add this line to the current segment
$templine.= $line;
// If it has a semicolon at the end, it's the end of the query
if (substr(trim($line) , -1, 1) == ';')
{
// Perform the query
if (!mysql_query($templine))
{
echo "Błąd ładownia pliku.sql";
return false;
} //echo $templine //TEST!
// Reset temp variable to empty
$templine = '';
}
}
return true;
} //end function
} //End calss
/* USE EXAMPLE
// DOWNLOAD DB FROM SERVER AS SQL FILE TO
$backupDatabase = new BackupDB(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
$status = $backupDatabase->backupTables(TABLES, OUTPUT_DIR) ? 'OK' : 'KO';
echo "<br /><br /><br />Backup result: ".$status;
// RETRIVE DATA FROM SQL FILE TO DATABASE
$backupDatabase->loadDB("Path/to/mysqlfile.sql");
*/
?>
如果您知道如何从数据库中提取外键，将它们一个接一个地删除，删除所有表，然后重新打开外键，请分享您的知识。再次感谢您的调查。
再次对于那些喜欢使用这个脚本的人来说，它工作得很好......如果！数据库中的表不与外键连接。让我们希望这种状态很快就会改变。
输出 .sql 文件的简短示例：
CREATE DATABASE IF NOT EXISTS DATABASEONE;
USE DATABASEONE;
DROP TABLE IF EXISTS st_glowne_st_pages;
CREATE TABLE `st_glowne_st_pages` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`fk_glowne` varchar(50) COLLATE utf8_polish_ci NOT NULL,
`fk_pages` varchar(50) COLLATE utf8_polish_ci NOT NULL,
`kolejnosc` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `id` (`id`),
KEY `fk_glowne` (`fk_glowne`),
KEY `fk_pages` (`fk_pages`),
CONSTRAINT `st_glowne_st_pages_ibfk_1` FOREIGN KEY (`fk_glowne`) REFERENCES `st_glowne` (`name`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `st_glowne_st_pages_ibfk_2` FOREIGN KEY (`fk_pages`) REFERENCES `st_pages` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;
INSERT INTO st_glowne_st_pages VALUES("1","admin.php","pageadmin.php","1");
INSERT INTO st_glowne_st_pages VALUES("3","index.php","pageindex.php","1");
INSERT INTO st_glowne_st_pages VALUES("4","work.php","pagework.php","1");
INSERT INTO st_glowne_st_pages VALUES("7","register.php","pageregister.php","1");
INSERT INTO st_glowne_st_pages VALUES("8","login.php","pagelogin.php","1");