Question

在从数据库搜索时我需要一些帮助。我曾使用嵌套循环在不同的表和列中进行搜索。

<?php
    $mysqli = new mysqli("localhost", "root", "", "mobirise");

    if ($mysqli->connect_error) {
        die("Connection failed: " . $mysqli->connect_error);
    }
    if(!empty ($_POST['stext'])){
        $query = $_POST['stext'];
        $min_length = 3;
        if(strlen($query) >= $min_length){
            $sql_r= $mysqli->query("show tables from mobirise;");
            while($table = mysqli_fetch_array($sql_r)) {
                $res=$table[0];
                //print"$res"."<br>";
                $sql_i= $mysqli->query("show columns from ".$res.";");
                while($tables = mysqli_fetch_array($sql_i)) {
                    $reslt=$tables[0];
                    //print"&nbsp;". "&nbsp;". "&nbsp;"."$reslt"."<br>";
                    $raw_results = $mysqli->query("SELECT * FROM $res WHERE $reslt LIKE '%".$query."%'");
                    print_r($raw_results);?><br><?php
                }
            }
        }
    }
?>

那样的打印结果

{
    mysqli_result Object ( 
        [current_field] => 0 
        [field_count] => 8 
        [lengths] => 
        [num_rows] => 0 
        [type] => 0 
) 
}

但是我想要表数据。

Answer 1

我找到了答案。我只是忘记了mysqli_fetch_array语句。更新的代码>

        <?php
$mysqli = new mysqli("localhost", "root", "", "mobirise");
    if ($mysqli->connect_error) {
        die("Connection failed: " . $mysqli->connect_error);
    }
    if(!empty ($_POST['stext'])){
        $query = $_POST['stext'];
        $min_length = 3;
        if(strlen($query) >= $min_length){
            $sql_r= $mysqli->query("show tables from mobirise;");
            while($table = mysqli_fetch_array($sql_r)) {
                $res=$table[0];
                $sql_i= $mysqli->query("show columns from ".$res.";");
                while($tables = mysqli_fetch_array($sql_i)) {
                    $reslt=$tables[0];
                    $raw_results = $mysqli->query("SELECT * FROM $res WHERE $reslt LIKE '%".$query."%'");
                    print_r(mysqli_fetch_array($raw_results));
                }
            }
        }
    }

？>

现在得到我的精确输出。

我如何使用php变量和循环通过mysql搜索数据库？

1 个答案: