将每个 MySQL 表备份到它自己的文件中

Question

我正在尝试将每个数据库备份到其自己的文件中。

我有下面的脚本，但是每次循环运行时，它都会将以前的表添加到其中，我哪里出错了？

// Get All Table Names From the Database
$tables = array();
$sql = "SHOW TABLES";
$result = mysqli_query($conn, $sql);

while ($row = mysqli_fetch_row($result)) {
    $tables[] = $row[0];
}

$sqlScript = "";
foreach ($tables as $table) {

    
    // Prepare SQLscript for creating table structure
    $query = "SHOW CREATE TABLE $table";
       // echo"SHOW CREATE TABLE $table<br>";
    $result = mysqli_query($conn, $query);
    $row = mysqli_fetch_row($result);
    
    $sqlScript .= "\n\n" . $row[1] . ";\n\n";
    
    
    $query = "SELECT * FROM $table";
    $result = mysqli_query($conn, $query);
    
    $columnCount = mysqli_num_fields($result);
    
    // Prepare SQLscript for dumping data for each table
    for ($i = 0; $i < $columnCount; $i ++) {
        while ($row = mysqli_fetch_row($result)) {
            $sqlScript .= "INSERT INTO $table VALUES(";
            for ($j = 0; $j < $columnCount; $j ++) {
                $row[$j] = $row[$j];
                
                if (isset($row[$j])) {
                    $sqlScript .= '"' . $row[$j] . '"';
                } else {
                    $sqlScript .= '""';
                }
                if ($j < ($columnCount - 1)) {
                    $sqlScript .= ',';
                }
            }
            $sqlScript .= ");\n";
        }
    }
    
    $sqlScript .= "\n"; 

    
$myfile = fopen("backups/$datetime-$table.sql", "w") or die("Unable to open file!");
$txt = "$sqlScript";
fwrite($myfile, $txt);
fclose($myfile);


}

我正在尝试为数据库中的每个表实现一个文件...

Answer 1

移动

$sqlScript = "";

插入 foreach 循环，以便为每个表重置此变量的值。