Question

我的mysql数据库中有一个图像，类型为longblob。我有一个请求图像和成功的ajax调用，将我的html图像src更改为接收到的图像。我的ajax post响应是图像名称（114046.png），但它会触发ajax错误部分，而不是成功。有人可以查看我的代码并告诉我哪里出错了吗？

在DB中保存图像

    public function UploadImage($imageData) {
        global $dbCon;

        $imgFile = $imageData['file']['name'];
        $imgSize = $imageData['file']['size'];

        if(empty($imgFile)){
            error_log("image file empty");
        }

        $imgExt = strtolower(pathinfo($imgFile,PATHINFO_EXTENSION)); // get image extension

        // valid image extensions
        $valid_extensions = array('jpeg', 'jpg', 'png', 'gif'); // valid extensions

        if(!in_array($imgExt, $valid_extensions)) { 
            error_log("Sorry, only JPG, JPEG, PNG & GIF files are allowed."); 
        }  

        // Check file size '5MB'
        if($imgSize > 5000000) {
            error_log("Sorry, your file is too large.");
        }

        // rename uploading image
        $userpic = rand(1000,1000000).".".$imgExt;

        $sql = 'UPDATE userinfo SET image=(:image) WHERE username="'.$this->currentUsername.'"';

        $stmt = $dbCon->prepare($sql);

        $stmt->bindParam(':image', $userpic);
        $stmt->execute();

        if($stmt == false) { 
            error_log("Failed to put image info in DB");
        } else {
            //image uploaded
        }
    }

从数据库中获取图像

    public function GetImage() {
        global $dbCon;

        $stmt = $dbCon->query("SELECT image FROM userinfo WHERE username='".$this->currentUsername."'");

        $fetchResult = $stmt->fetch();
        $data = $fetchResult["image"];

        if($stmt == false) { 
            error_log("Failed to put image info in DB");
        } else {
            $this->LatestUpdate = "Get Image";
            $this->image = $data;
        }
    }

    public function GetTheImage() {
        return $this->image;
    }

回应ajax

        if($this->model->LatestUpdate() == "Get Image") {
            header("Content-type: image/png");
            echo $this->model->GetTheImage();
            exit();
        }

Ajax调用（将HTML图像设置为接收的图像）

window.onload = SetImage;

function SetImage() {
    data = "action=" + "getImage";
    $.ajax({
            url: '../index.php', // point to server-side PHP script 
            dataType: 'image/png',  // what to expect back from the PHP script, if anything
            data: data,                         
            type: 'post',
            success: function(image) {
                console.log("success");
                $("#profileImage").attr("src", image);
            }, error: function(xhr, status, error) {
                alert("Error" + xhr.responseText);
            }
     });
}

通过AJAX接收图像时不显示

0 个答案: