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我正在寻找解决方案如何从MySQL数据库创建json文件。下面是一个代码:Json文件创建
*
<!DOCTYPE html>
<html>
<body>
<p id="container"></p>
<script>
var obj, dbParam, xmlhttp, myObj, x, txt = "";
obj = { "table":"produkty", "limit":10 };
dbParam = JSON.stringify(obj);
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myObj = JSON.parse(this.responseText);
for (x in myObj) {
txt += myObj[x].name + "<br>";
}
document.getElementById("demo").innerHTML = txt;
} <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
};
xmlhttp.open("POST", "test4.php", true);
xmlhttp.setRequestHeader("Content-type", "text/xml");
xmlhttp.send("x=" + dbParam);
</script>
<?php
header("Content-Type: application/json; charset=UTF-8");
$obj = json_decode($_POST["x"], false);
$conn = new mysqli("localhost", "root", "", "projekt_1");
$result = $conn->query("SELECT produkt FROM ".$obj->table." LIMIT ".$obj->limit);
$outp = array();
$outp = $result->fetch_all(MYSQLI_ASSOC);
echo json_encode($outp);
?>
</body>
</html>
*
在JSON文件我recievied信息:
<br />
<b>Notice</b>: Undefined index: x in <b>C:\xampp\htdocs\projekt_1\test4.php</b> on line <b>31</b><br />
<br />
<b>Notice</b>: Trying to get property of non-object in <b>C:\xampp\htdocs\projekt_1\test4.php</b> on line <b>34</b><br />
<br />
<b>Notice</b>: Trying to get property of non-object in <b>C:\xampp\htdocs\projekt_1\test4.php</b> on line <b>34</b><br />
<br />
<b>Fatal error</b>: Call to a member function fetch_all() on boolean in <b>C:\xampp\htdocs\projekt_1\test4.php</b> on line <b>36</b><br />
不知道在哪里是错误的。我很新,所以我的问题很明显。
在此先感谢。
我在这个论坛新的,我应该以前也检查回答我的问题,但是当我包括在该建议如下面的代码,并在Apache的白色屏幕运行说到。我已经从数据库中预测了前10行。我已经检查了白色屏幕出现时可以完成的步骤。它包含在一个文件中test4.php整个代码:
<?php
ini_set('display_errors', 1); error_reporting(~0);
?>
<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title>Test file</title>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<p id="container"></p>
<script>
var obj, dbParam, xmlhttp, myObj, x, txt = "";
obj = { "table":"produkty", "limit":10 };
dbParam = JSON.stringify(obj);
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myObj = JSON.parse(this.responseText);
for (x in myObj) {
txt += myObj[x].name + "<br>";
}
document.getElementById("container").innerHTML = txt;
}
};
xmlhttp.open("POST", "test4.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send("x=" + dbParam);
</script>
<?php
if (count($_POST)) {
header("Content-Type: application/json; charset=UTF-8");
$obj = json_decode($_POST["x"], false);
$conn = new mysqli("localhost", "root", "", "projekt_1");
$result = $conn->query("SELECT produkt FROM ".$obj->table." LIMIT ".$obj->limit);
$outp = array();
$outp = $result->fetch_all(MYSQLI_ASSOC);
echo json_encode($outp);
}
?>
</body>
</html>
所有这些错误消息已经讨论了很多次,所以请去_research_他们。 – CBroe
这是一个文件吗?你应该有一个单独的脚本,用于你的ajax调用,它只输出json而不是其他东西。 – jeroen
也显示test4.php。 – YvesLeBorg