Question

我想创建一个PHP脚本，用于从数据库备份我选择的表。从Stack Overflow我发现了这个：

<?php 
//ENTER THE RELEVANT INFO BELOW
$mysqlUserName      = "root";
$mysqlPassword      = "";
$mysqlHostName      = "localhost";
$DbName             = "test";
$backup_name        = "mybackup.sql";
$tables             = "msc_market";

//or add 5th parameter(array) of specific tables:      array("mytable1","mytable2","mytable3") for multiple tables

Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables=false, $backup_name=false );

function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
{
    $mysqli = new mysqli($host,$user,$pass,$name); 
    $mysqli->select_db($name); 
    $mysqli->query("SET NAMES 'utf8'");

    $queryTables    = $mysqli->query('SHOW TABLES'); 
    while($row = $queryTables->fetch_row()) 
    { 
        $target_tables[] = $row[0]; 
    }   
    if($tables !== false) 
    { 
        $target_tables = array_intersect( $target_tables, $tables); 
    }
    foreach($target_tables as $table)
    {
        $result         =   $mysqli->query('SELECT * FROM '.$table);  
        $fields_amount  =   $result->field_count;  
        $rows_num=$mysqli->affected_rows;     
        $res            =   $mysqli->query('SHOW CREATE TABLE '.$table); 
        $TableMLine     =   $res->fetch_row();
        $content        = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

        for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) 
        {
            while($row = $result->fetch_row())  
            { //when started (and every after 100 command cycle):
                if ($st_counter%100 == 0 || $st_counter == 0 )  
                {
                        $content .= "\nINSERT INTO ".$table." VALUES";
                }
                $content .= "\n(";
                for($j=0; $j<$fields_amount; $j++)  
                { 
                    $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); 
                    if (isset($row[$j]))
                    {
                        $content .= '"'.$row[$j].'"' ; 
                    }
                    else 
                    {   
                        $content .= '""';
                    }     
                    if ($j<($fields_amount-1))
                    {
                            $content.= ',';
                    }      
                }
                $content .=")";
                //every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
                if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) 
                {   
                    $content .= ";";
                } 
                else 
                {
                    $content .= ",";
                } 
                $st_counter=$st_counter+1;
            }
        } $content .="\n\n\n";
    }
    //$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
    $backup_name = $backup_name ? $backup_name : $name.".sql";
    header('Content-Type: application/octet-stream');   
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"".$backup_name."\"");  
    echo $content;
}
?>

现在，在此代码中，我更改 $ tables 值以选择单个表或更多表。对于多个表，我放置了一个包含表名的数组。但问题是每次我得到所有表的完整备份，即使我每次得到相同结果时都改变 $ tables 值。如何仅获取所选表的备份？请帮帮我。

Answer 1

如图所示，Export_Database（）中的第五个参数值在调用时被false值覆盖，您需要传递数据库表数组，因为array_intersect（）只能从数组参数中过滤类似的值。修改后的代码......

Export

Answer 2

您的问题是array_intersect正在处理值，而不是键。由于这些是一维数组，因此您需要像这样交叉键：

$target_tables = array_values(array_intersect(array_keys($target_tables), array_keys($tables)));

<强>说明：基本上，您首先将数组更改为键数组，然后将它们相交，然后将其转换回值。

使用PHP从MySQL备份多个表

2 个答案: