我想在数据库中存储图像。我尝试使用插入查询，但是通过更新（使用UPDATE查询）无法正常工作。而且检索查询不起作用。我想在三个位置检索图像。
这是我的代码...其他所有内容均已成功更新和检索，但未存储和检索图像..请帮助我解决问题。 我正在使用长Blob数据类型来存储图像。
更新是在PersonalDetails模式下完成的。这是我的模式及其php代码。
StudentProfile.php（需要在卡片和模式中都进行检索）
<?php
// Initialize the session
session_start();
// Include Connection file
require_once 'Connection.php';
//define variables
include('Variables.php');
//define variables for errors
$first_name_err=$middle_name_err=$last_name_err=$admitted_date_err=$academic_year_err=$course_err=$dob_err=$nic_err=$gender_err=$nationality_err=$religion_err=$race_err="";
//Create select query for retrieving data
$sql = "SELECT personal_details.*,contact_details.*,academic_details.*,extra_curricular_activities.* FROM personal_details JOIN contact_details ON personal_details.Student_ID = contact_details.Student_ID JOIN academic_details ON personal_details.Student_ID = academic_details.Student_ID JOIN extra_curricular_activities ON personal_details.Student_ID = extra_curricular_activities.Student_ID WHERE personal_details.Student_ID = '{$_SESSION['student_id']}'";
//Check query
$result = $connection->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
//Include Row File
include('Row.php');
}
} else {
echo "No results found";
}
//Close connection
$connection->close();
?>
//card
//Image need to retrieve here
<div class="col-3">
<?php echo '<img src="data:image/jpeg;base64,'.base64_encode($profile_picture).'" height="200" width="200" />';?>
</div>
<div class="col-9">
//modal
<!--Model body-->
<form action="PersonalDetails.php" method="post" enctype="multipart/form-data">
<div class="modal-body mx-3">
<div class="row">
<div class="md-form col-6">
<?php echo '<img src="data:image/jpeg;base64,'.base64_encode($profile_picture).'" height="200" width="200" class="img-thumnail" />';?><br><br>
<div class="custom-file">
<input type="file" name="profile_picture" class="custom-file-input" id="inputGroupFile01" aria-describedby="inputGroupFileAddon01">
<label class="custom-file-label" for="inputGroupFile01"></label>
</div>
</div>
PersonalDetails.php
<?php
// Initialize the session
session_start();
// Include Connection file
require_once 'Connection.php';
//define variables
include('Variables.php');
//define variables for errors
$first_name_err=$middle_name_err=$last_name_err=$admitted_date_err=$academic_year_err=$course_err=$dob_err=$nic_err=$gender_err=$nationality_err=$religion_err=$race_err="";
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
if(isset($_POST["save"])){
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate input fields
if(empty(trim($_POST['first_name'])) || empty(trim($_POST['middle_name'])) || empty(trim($_POST['last_name'])) || empty(trim($_POST['admitted_date'])) || empty(trim($_POST['academic_year'])) || empty(trim($_POST['course'])) || empty(trim($_POST['dob'])) || empty(trim($_POST['nic'])) || empty(trim($_POST['gender'])) || empty(trim($_POST['nationality'])) || empty(trim($_POST['religion'])) || empty(trim($_POST['race'])) ){
$_SESSION['empty'] = "Mandatory fields are missing.Please fill the empty fields.";
header('location: StudentProfile.php');
}
$first_name = test_input($_POST['first_name']);
$middle_name = test_input($_POST['middle_name']);
$last_name = test_input($_POST['last_name']);
// check if Name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$first_name) || !preg_match("/^[a-zA-Z ]*$/",$middle_name) || !preg_match("/^[a-zA-Z ]*$/",$last_name)) {
$_SESSION['charachter']= "Only letters and white space allowed";
header('location: StudentProfile.php');
}
// Check input errors before inserting in database
if(empty($_SESSION['empty']) && empty($_SESSION['charachter']) ){
// Prepare a select statement
$sql = "SELECT * FROM personal_details WHERE Student_ID = '{$_SESSION['student_id']}'";
$result = $connection->query($sql);
// Check if student id exists, if yes then create update query
if($result->num_rows > 0){
$file = addslashes(file_get_contents($_FILES["profile_picture"]["tmp_name"]));
$sql="UPDATE personal_details
SET Profile_Picture='$file',
First_Name='$first_name',
Middle_Name='$middle_name',
Last_Name='$last_name',
Admitted_Date='$admitted_date',
Academic_Year='$academic_year',
Course='$course',
DOB='$dob',
NIC='$nic',
Gender='$gender',
Nationality='$nationality',
Religion='$religion',
Race='$race'
WHERE Student_ID='{$_SESSION['student_id']}'";
if ($connection->query($sql) === TRUE) {
$_SESSION['success'] = "Updated Successfully!!";
header('location: StudentProfile.php');
} else {
$_SESSION['error'] = "Error: " . $sql . "<br>" . $connection->error;
}
} else{
$file = addslashes(file_get_contents($_FILES["profile_picture"]["tmp_name"]));
$allowed = array("jpeg","jpg","png");
// Create a insert query if student id doesn't exist
$sql= "INSERT INTO personal_details(Student_ID,Profile_Picture,First_Name,Middle_Name,Last_Name,Admitted_Date,Academic_Year,Course,DOB,NIC,Gender,Nationality,Religion,Race)
VALUES ('{$_SESSION['student_id']}','$file','$first_name','$middle_name','$last_name','$admitted_date','$academic_year','$course','$dob','$nic','$gender','$nationality','$religion','$race')";
if ($connection->query($sql) === TRUE) {
$_SESSION['success'] = "Submitted Successfully!!";
header('location: StudentProfile.php');
} else {
$_SESSION['error'] = "Error: " .$sql."<br>". $connection->error;
}
}
}
}
}
$connection->close();
?>