php - 从 mysql 表获取行到 php 数组并将其传递给 ajax

Question

我正在尝试使用 mysql_query 和 mysql_fetch_array 的常规方式从 ajax 的常规表中获取值。调用php

if ($comtype==3){
        $getsteps = mysql_query("SELECT id FROM steps WHERE id = $id");

        $row = mysql_fetch_array($getsteps);
        if($row != false){
            $steps_array = array();
            while ($row = mysql_fetch_array($getsteps, MYSQL_ASSOC)) 
            {
                array_push($steps_array,$row);
            }
            $countsteps = count($steps_array);

            error_log("count: ".$countsteps);
            error_log(print_r($steps_array));

            echo json_encode(array("comtype" => $comtype, "countsteps" => $countsteps, "steps" => $steps_array)); 
        } else {
            //error
        }
    }

在 php错误日志:

[28-Aug-2017 11:25:32 UTC] count: 1 [28-Aug-2017 11:25:32 UTC] 1

虽然我知道它是 2 行!!!

以及 ajax

$.ajax({
            type:'POST',
            url:'app/check.php',
            data: {'ID':ID},
            dataType: 'json',
            success: function(value){
                if (value.comtype== "0") {
                        $("#newC").show();
                        $("#hadC").hide();
                    } else {
                        var method;
                        var com;
                        com = "<div class='clearfix'></div><br><h3>old.</h3>";
                        com += "By Stpes: <br>";

                            for (i = 0; i < value.countsteps; i++) { 
                                com += "Step " + Number(i)+1 + ": Greater Than " + value.steps_array['calfrom'] + " AND Less Than or Equal " + value.steps_array['calto'] + " Apply "  + value.steps_array['calapl'] + " % <br>";
                            }
                        }

                        $("#hadC").html(com);
                        $("#hadC").show();
                        $("#newC").hide();
                    }
                }   
            });

问题是: 1.我不知道如何将while中的数据插入数组？ 2.我不知道如何在ajax中循环进入这个数组以在html中查看它 分区？

Answer 1

问题是您在 while 循环之前调用 mysql_fetch_array()。这将获取第一行，循环将获取剩余的行。

如果要测试循环之前是否返回任何行，请调用mysql_num_rows()。您还可以使用它来代替 count($steps_array)。

if ($comtype==3){
    $getsteps = mysql_query("SELECT id FROM steps WHERE id = $id");

    $countsteps = mysql_num_rows($getsteps);
    if($countsteps > 0) {
        $steps_array = array();
        while ($row = mysql_fetch_array($getsteps, MYSQL_ASSOC)) 
        {
            array_push($steps_array,$row);
        }

        error_log("count: ".$countsteps);
        error_log(print_r($steps_array));

        echo json_encode(array("comtype" => $comtype, "countsteps" => $countsteps, "steps" => $steps_array)); 
    } else {
        //error
    }
}