Cách lấy dữ liệu từ cơ sở dữ liệu trong php bằng cách sử dụng khái niệm oops

Các thao tác cơ sở dữ liệu trong PHP là một điều rất quan trọng, đặc biệt cần thiết trong các thao tác CRUD (Tạo, Đọc, Cập nhật và Xóa)

Trong bài viết này, chúng ta sẽ thảo luận về Đọc phần i. e. lấy dữ liệu từ cơ sở dữ liệu

Có hai cách để kết nối với cơ sở dữ liệu bằng PHP. Chúng như sau

  1. MySQLi (“i” là viết tắt của cải tiến)
  2. PDO (Đối tượng dữ liệu PHP)

MySQLi so với PDO. Cả hai cách đều thực sự tốt nhưng chỉ có một điểm khác biệt giữa hai phương pháp, PDO có thể hoạt động trên 12 hệ thống cơ sở dữ liệu khác nhau trong khi MySQLi chỉ hoạt động với cơ sở dữ liệu MySQL

Kết nối với cơ sở dữ liệu

  • Hướng đối tượng MySQLi

    $conn = new mysqli($servername, $username, $databasename)
  • Thủ tục MySQLi

    $conn = mysqli_connect($servername, 
        $username, $password, $databasename);
  • PDO

    $conn = new PDO("mysql:host=$servername;dbname=myDB",
        $username, $password, $databasename);

Thực hiện truy vấn. Sau khi kết nối với cơ sở dữ liệu, chúng ta cần chạy các truy vấn để tìm nạp dữ liệu. Trong hoạt động Đọc, chúng tôi sẽ chỉ sử dụng các truy vấn được chọn để tìm nạp dữ liệu từ cơ sở dữ liệu

  • Hướng đối tượng MySQLi

    $conn->query($query);
  • Thủ tục MySQLi

    mysqli_query($conn, $query)
  • PDO

    $stmt = $conn->prepare($query);
    $stmt->execute();

Đóng kết nối. Sau khi quá trình tìm nạp được thực hiện, bạn nên đóng kết nối tới cơ sở dữ liệu bằng hàm close()

$conn->close();

Cơ sở dữ liệu mẫu

Tạo Table trong cơ sở dữ liệu

CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);

Cách lấy dữ liệu từ cơ sở dữ liệu trong php bằng cách sử dụng khái niệm oops

Chi tiết sinh viên

Cách tiếp cận hướng đối tượng MySQLi

Mã PHP

PHP




$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
1

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
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    $username, $password, $databasename);
4
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5
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6
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7

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3
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9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
6
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

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    $username, $password, $databasename);
3____35

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->query($query);
7
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
9
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0
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4
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2

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3
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    $username, $password, $databasename);
9
mysqli_query($conn, $query)
2
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    $username, $password, $databasename);
4
mysqli_query($conn, $query)
2
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____52

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$stmt = $conn->prepare($query);
$stmt->execute();
4
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5
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7
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7

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8
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9
$stmt = $conn->prepare($query);
$stmt->execute();
5
$conn->close();
1
$conn->close();
2
$conn->query($query);
7
$conn->close();
4

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____66

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    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->close();
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
7
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
92
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

mysqli_query($conn, $query)
3
$stmt = $conn->prepare($query);
$stmt->execute();
4
$stmt = $conn->prepare($query);
$stmt->execute();
5
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
70

mysqli_query($conn, $query)
3____872

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
73
$conn = mysqli_connect($servername, 
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74

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73
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76
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5
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    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
01

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
73
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72

________ 104 ________ 105 ________ 106 ________ 62

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08
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78
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10
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11
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12
$conn = mysqli_connect($servername, 
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13
$conn->close();
2

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08
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78
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10
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18
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12
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20
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21

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08
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78
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10
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25
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12
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27
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21

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08
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78
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10
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32
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12
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34
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7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
73
$conn->close();
6

mysqli_query($conn, $query)
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
39

mysqli_query($conn, $query)
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
41
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
72

________ 873 ________ 105 ________ 145 ________ 17

mysqli_query($conn, $query)
3
$conn->close();
6

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
50
$conn->query($query);
7____152

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
54

đầu ra

CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9

Phương pháp thủ tục MySQLi

Mã PHP

PHP




$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
1

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
6
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
6
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____35

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->query($query);
7
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
82
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
84

mysqli_query($conn, $query)
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
9
mysqli_query($conn, $query)
2
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
mysqli_query($conn, $query)
2
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____52

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3_______54
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
97____37
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
99

$stmt = $conn->prepare($query);
$stmt->execute();
8
$stmt = $conn->prepare($query);
$stmt->execute();
9
$stmt = $conn->prepare($query);
$stmt->execute();
5
$conn->close();
1
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
04

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____66

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->close();
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
13
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3_______79
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
19____37____42
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$stmt = $conn->prepare($query);
$stmt->execute();
4
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
27
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
29

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
74

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
76______55
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
36
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
38

$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
39
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
05
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
06
$conn->close();
2
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
10
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
11
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
46

$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
39
$conn->close();
2
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
13
$conn->close();
2
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
10
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
18
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
12
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
34
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->close();
6

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____66____141
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
72

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
05
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
45
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____66

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3______37
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
52

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
54

đầu ra

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

Phương pháp tiếp cận PDO

Mã PHP

PHP




$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
1

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
6
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
6
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____35

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->query($query);
7
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
82
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
4
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
84

mysqli_query($conn, $query)
3
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
9
mysqli_query($conn, $query)
2
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
mysqli_query($conn, $query)
2
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
9
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____52

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3_______54
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
97____37
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
99

$stmt = $conn->prepare($query);
$stmt->execute();
8
$stmt = $conn->prepare($query);
$stmt->execute();
9
$stmt = $conn->prepare($query);
$stmt->execute();
5
$conn->close();
1
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
04

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____66

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
$conn->close();
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
33
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____337

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
3____872

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
7
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
9
$conn->query($query);
44

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
73
$conn->query($query);
46
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
84

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
73
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
9____42
$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
4
mysqli_query($conn, $query)
9

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

_______58____37____356

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
58
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
7
$conn->query($query);
61
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
1
mysqli_query($conn, $query)
9

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
65

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
58
$conn->query($query);
68

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
2

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
71
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5
$conn->query($query);
58
$conn->query($query);
74

$stmt = $conn->prepare($query);
$stmt->execute();
8
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
7

$stmt = $conn->prepare($query);
$stmt->execute();
8
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
5____358
$conn->query($query);
81

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
74

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn->query($query);
85
$stmt = $conn->prepare($query);
$stmt->execute();
5
CREATE TABLE `Student Details` (
  `Roll_No` int(11) NOT NULL,
  `Name` varchar(255) NOT NULL,
  `City` varchar(255) NOT NULL,
  `Age` int(11) NOT NULL,
  PRIMARY KEY (`Roll_No`)
);
9
$conn->query($query);
88
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn->query($query);
90

$stmt = $conn->prepare($query);
$stmt->execute();
8
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
72

$conn = new PDO("mysql:host=$servername;dbname=myDB",
    $username, $password, $databasename);
39
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
05
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
06
$conn->close();
2
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
10
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
11
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
12
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
13
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
21

$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
04
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
10
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
18
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
12
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
20
$conn->close();
2
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
78
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
10
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
25
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
12
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
34
$conn = mysqli_connect($servername, 
    $username, $password, $databasename);
7

Cách tìm nạp dữ liệu từ cơ sở dữ liệu trong PHP Rất tiếc?

Trong thao tác Đọc, chúng tôi sẽ chỉ sử dụng các truy vấn được chọn để tìm nạp dữ liệu từ cơ sở dữ liệu. .
Hướng đối tượng MySQLi $conn->query($query);
MySQLi Thủ tục mysqli_query($conn, $query)
PDO. $stmt = $conn->prepare($query);

Làm cách nào tôi có thể tìm nạp tất cả dữ liệu từ một bảng trong PHP?

Hàm fetch_all() / mysqli_fetch_all() tìm nạp tất cả các hàng kết quả và trả về tập kết quả dưới dạng một mảng kết hợp, một mảng số .

Khái niệm OOP được sử dụng trong PHP là gì?

PHP OOP là gì? . Lập trình thủ tục là viết các thủ tục hoặc hàm thực hiện các thao tác trên dữ liệu, trong khi lập trình hướng đối tượng là về tạo các đối tượng chứa cả dữ liệu và hàm .

Tìm nạp dữ liệu trong PHP là gì?

mysql_fetch_row() tìm nạp một hàng dữ liệu từ kết quả được liên kết với mã định danh kết quả đã chỉ định . Hàng được trả về dưới dạng một mảng. Mỗi cột kết quả được lưu trữ trong một mảng offset, bắt đầu từ offset 0.