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用PHP格式化文本

sql php

homework · 技术社区 · 15 年前

有没有一种方法可以格式化一个列表以便通过SQL插入它?

我当前的列表格式是 test:test 我希望能够格式化它,这样它就可以插入到我的数据库中。

INSERT INTO `test` (`user`, `file`) VALUES
('test', 'test'),
('test2', 'test2'),
('test@test3.com', 'test3');

这有可能吗?

<?
if($_POST['oldlist']){

$sql = "SELECT * FROM test WHERE user='$_POST[oldlist]'";
$result = mysql_query($sql) or die(mysql_error());
if(mysql_num_rows($result) > 0) { echo "exists";} else {

$sqlq = "INSERT INTO test (`user` ,`file`)
VALUES ('$_POST[oldlist]');";
$add = mysql_query($sqlq) or die(mysql_error());
if($add){echo "done";}else {echo "failed";}
}}
?>

用这种方法做什么?我希望能够发布一个列表,并将其插入到我的数据库中,但必须先对其进行格式化。

2 回复 | 直到 10 年前

mattbasta 15 年前

代码中有严重的SQL注入缺陷。确保你逃避你的价值观!以下是我建议您转义代码并将其插入数据库的方法:

<?php
// Use isset to determine whether there is a value present
if(isset($_POST['oldlist'])){

    $oldlist = $_POST['oldlist'];
    // Escape your data. Makes sure someone inject code that can jack your DB
    $oldlist_esc = mysql_real_escape_string($oldlist);

    $sql = "SELECT * FROM test WHERE user='$oldlist_esc'";
    $result = mysql_query($sql) or die(mysql_error());
    if(mysql_num_rows($result) > 0)
        echo "exists";
    else {
        // I'll assume your data is line-delimited
        $oldlist = explode("\n", $oldlist);
        $new_oldlist = $oldlist;
        foreach($oldlist as $key=>$value) {
            $new_oldlist[$key] = explode(" ", $value, 1); // I'll assume each line is space-delimited

            // Escape the new data
            foreach($new_oldlist[$key] as $new_key=>$new_value)
                $new_oldlist[$kew_key] = mysql_real_escape_string($new_value);
        }
        $sqlq =    "INSERT INTO test (`user` ,`file`) VALUES ";

        // Build out the query
        $c = 0;
        foreach($new_oldlist as $value) {
            if($c++ > 0) $sqlq .= ',';
            $sqlq .= '("';
            $sqlq .= implode('","', $value);
            $sqlq .= '")';
        }

        $add = mysql_query($sqlq) or die(mysql_error());
        if($add)
            echo "done";
        else
            echo "failed";
    }
}

?>

可以在字符串中使用变量(例如:“asdfasdf$myvar asdfasdf”),但请记住使用 mysql_real_escape_string . 这样可以防止用户插入数据,如:

';DELETE FROM test WHERE true;--

这将有效地清除数据库。希望这有帮助!

Ast Derek 15 年前

如果您的$\u post在数组中有一些成对的值,请尝试用“:”分解数组中的每个元素,并使用适合于单个插入的语法将它们连接起来,然后为多个插入连接整个数组:

<?
// Just added 'olduser' as it seemed to go with WHERE user=... , change to your needs
if($_POST['olduser'] && $_POST['oldlist']){

$sql = "SELECT * FROM test WHERE user='$_POST[olduser]'";
$result = mysql_query($sql) or die(mysql_error());
if(mysql_num_rows($result) > 0) { echo "exists";} else {

foreach ($_POST['oldlist'] as &$each)
{
    $each = explode(":",$each);
    $each = "('".join("','",$each)."')";
}

$_POST['oldlist'] = join(",",$_POST['oldlist']);

// no semi-colon at end
$sqlq = "INSERT INTO test (`user` ,`file`) VALUES $_POST[oldlist]";
$add = mysql_query($sqlq) or die(mysql_error());
if($add){echo "done";}else {echo "failed";}
}}
?>

不管怎样,请小心处理您的语句,如果不清除查询,即使在本地使用,我也不会保留它。