Cách tìm nạp 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) Show 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
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
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
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() $conn->close(); Cơ sở dữ liệu mẫu Tạo Table trong cơ sở dữ liệu CREATE TABLE `Student Details` ( `Roll_No` int(11) NOT NULL, `Name` varchar(255) NOT NULL, `City` varchar(255) NOT NULL, `Age` int(11) NOT NULL, PRIMARY KEY (`Roll_No`) ); Chi tiết sinh viên Cách tiếp cận hướng đối tượng MySQLi Mã PHP PHP$conn = mysqli_connect($servername, $username, $password, $databasename);1 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______1_______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_______1_______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_______2_______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_______2_______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_______3_______5 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______3_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);5 $conn->query($query);9 mysqli_query($conn, $query)0 $conn = mysqli_connect($servername, $username, $password, $databasename);4 mysqli_query($conn, $query)2 mysqli_query($conn, $query)3 $conn = mysqli_connect($servername, $username, $password, $databasename);9 mysqli_query($conn, $query)2_______2_______4 mysqli_query($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_______5_______2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______5_______4 $stmt = $conn->prepare($query); $stmt->execute();5_______3_______7_______5_______7 $stmt = $conn->prepare($query); $stmt->execute();8_______5_______9 $stmt = $conn->prepare($query); $stmt->execute();5_______6_______1 $conn->close();2 $conn->query($query);7_______6_______4 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______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_______1_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);5 $conn->query($query);7 Roll No: 1 - Name: Ram | City: Delhi | Age: 18 Roll No: 2 - Name: Shyam | City: Mumbai | Age: 19 Roll No: 3 - Name: Rohit | City: Chennai | Age: 18 Roll No: 4 - Name: Suresh | City: Kolkata | Age: 202 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); $stmt->execute();5 CREATE TABLE `Student Details` ( `Roll_No` int(11) NOT NULL, `Name` varchar(255) NOT NULL, `City` varchar(255) NOT NULL, `Age` int(11) NOT NULL, PRIMARY KEY (`Roll_No`) );9 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh0 mysqli_query($conn, $query)3____87_______2 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh4 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh6 $stmt = $conn->prepare($query); $stmt->execute();5 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($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 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3____87_______2 $conn = mysqli_connect($servername, $username, $password, $databasename);04_______1_______05 $conn = mysqli_connect($servername, $username, $password, $databasename);06 $conn->close();2 $conn = mysqli_connect($servername, $username, $password, $databasename);08 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($servername, $username, $password, $databasename);10_______1_______11 $conn = mysqli_connect($servername, $username, $password, $databasename);12 $conn = mysqli_connect($servername, $username, $password, $databasename);13 $conn->close();2 $conn = mysqli_connect($servername, $username, $password, $databasename);08 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($servername, $username, $password, $databasename);10_______1_______18 $conn = mysqli_connect($servername, $username, $password, $databasename);12 $conn = mysqli_connect($servername, $username, $password, $databasename);20 $conn = mysqli_connect($servername, $username, $password, $databasename);21 $conn = mysqli_connect($servername, $username, $password, $databasename);08 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($servername, $username, $password, $databasename);10_______1_______25 $conn = mysqli_connect($servername, $username, $password, $databasename);12 $conn = mysqli_connect($servername, $username, $password, $databasename);27 $conn = mysqli_connect($servername, $username, $password, $databasename);21 $conn = mysqli_connect($servername, $username, $password, $databasename);08 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($servername, $username, $password, $databasename);10 $conn = mysqli_connect($servername, $username, $password, $databasename);32 $conn = mysqli_connect($servername, $username, $password, $databasename);12 $conn = mysqli_connect($servername, $username, $password, $databasename);34 $conn = mysqli_connect($servername, $username, $password, $databasename);7 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3_______6_______6 mysqli_query($conn, $query)3 $conn = mysqli_connect($servername, $username, $password, $databasename);39 mysqli_query($conn, $query)3 $conn = mysqli_connect($servername, $username, $password, $databasename);41 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh2 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3 $conn = mysqli_connect($servername, $username, $password, $databasename);05 $conn = mysqli_connect($servername, $username, $password, $databasename);45 $conn = mysqli_connect($servername, $username, $password, $databasename);7 mysqli_query($conn, $query)3_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);50 $conn->query($query);7 $conn = mysqli_connect($servername, $username, $password, $databasename);52 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);54 đầu ra Roll No: 1 - Name: Ram | City: Delhi | Age: 18 Roll No: 2 - Name: Shyam | City: Mumbai | Age: 19 Roll No: 3 - Name: Rohit | City: Chennai | Age: 18 Roll No: 4 - Name: Suresh | City: Kolkata | Age: 20 Phương pháp thủ tục MySQLi Mã PHP PHP$conn = mysqli_connect($servername, $username, $password, $databasename);1 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______1_______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_______1_______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_______2_______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_______2_______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_______3_______5 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______3_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);82 $conn = mysqli_connect($servername, $username, $password, $databasename);4_______1_______84 mysqli_query($conn, $query)3 $conn = mysqli_connect($servername, $username, $password, $databasename);9 mysqli_query($conn, $query)2_______2_______4 mysqli_query($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_______5_______2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______5_______4 $conn = mysqli_connect($servername, $username, $password, $databasename);97_______3_______7_______1_______99 $stmt = $conn->prepare($query); $stmt->execute();8_______5_______9_______5_______5 $conn->close();1 $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password, $databasename);04 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______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_______7_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______9 $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password, $databasename);19_______3_______7 mysqli_query($conn, $query)2 CREATE TABLE `Student Details` ( `Roll_No` int(11) NOT NULL, `Name` varchar(255) NOT NULL, `City` varchar(255) NOT NULL, `Age` int(11) NOT NULL, PRIMARY KEY (`Roll_No`) );1 mysqli_query($conn, $query)9 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______5_______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_______87_______4 $stmt = $conn->prepare($query); $stmt->execute();8_______87_______6 $stmt = $conn->prepare($query); $stmt->execute();5 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = new PDO("mysql:host=$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_______1_______05 $conn = mysqli_connect($servername, $username, $password, $databasename);06 $conn->close();2 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($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_______6_______2 $conn = mysqli_connect($servername, $username, $password, $databasename);13 $conn->close();2_______87_______8 $conn = mysqli_connect($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_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);41 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh2 $stmt = $conn->prepare($query); $stmt->execute();8_______1_______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_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______3_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);52 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);54 đầu ra Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh Phương pháp tiếp cận PDO Mã PHP PHP$conn = mysqli_connect($servername, $username, $password, $databasename);1 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______1_______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_______1_______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_______2_______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_______2_______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_______3_______5 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______3_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);82 $conn = mysqli_connect($servername, $username, $password, $databasename);4_______1_______84 mysqli_query($conn, $query)3 $conn = mysqli_connect($servername, $username, $password, $databasename);9 mysqli_query($conn, $query)2_______2_______4 mysqli_query($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_______5_______2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______5_______4 $conn = mysqli_connect($servername, $username, $password, $databasename);97_______3_______7_______1_______99 $stmt = $conn->prepare($query); $stmt->execute();8_______5_______9_______5_______5 $conn->close();1 $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password, $databasename);04 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______6 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______6_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______7_______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_______3_______37 $conn = mysqli_connect($servername, $username, $password, $databasename);3_______87_______2 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______7 $conn = mysqli_connect($servername, $username, $password, $databasename);5 $conn->query($query);9 $conn->query($query);44 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3_______3_______46 $conn = mysqli_connect($servername, $username, $password, $databasename);84 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh3 $conn = mysqli_connect($servername, $username, $password, $databasename);9 mysqli_query($conn, $query)2 $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password, $databasename);4_______4_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______7 $conn->query($query);56 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______58 $conn = mysqli_connect($servername, $username, $password, $databasename);5_______3_______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_______3_______65 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______58 $conn->query($query);68 $conn = mysqli_connect($servername, $username, $password, $databasename);2 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______71 $conn = mysqli_connect($servername, $username, $password, $databasename);5_______3_______58 $conn->query($query);74 $stmt = $conn->prepare($query); $stmt->execute();8_______7_______7 $stmt = $conn->prepare($query); $stmt->execute();8_______7_______9 $conn = mysqli_connect($servername, $username, $password, $databasename);5 $conn->query($query);58_______3_______81 $stmt = $conn->prepare($query); $stmt->execute();8_______87_______4 $stmt = $conn->prepare($query); $stmt->execute();8_______3_______85 $stmt = $conn->prepare($query); $stmt->execute();5_______7_______9 $conn->query($query);88 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn->query($query);90 $stmt = $conn->prepare($query); $stmt->execute();8_______87_______2 $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password, $databasename);39_______1_______05 $conn = mysqli_connect($servername, $username, $password, $databasename);06 $conn->close();2 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($servername, $username, $password, $databasename);10 $conn = mysqli_connect($servername, $username, $password, $databasename);11 $conn = mysqli_connect($servername, $username, $password, $databasename);12_______1_______13 $conn = mysqli_connect($servername, $username, $password, $databasename);21 $conn = mysqli_connect($servername, $username, $password, $databasename);04_______87_______8 $conn = mysqli_connect($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 Roll No: 1 - Name: Ram Roll No: 2 - Name: Shyam Roll No: 3 - Name: Rohit Roll No: 4 - Name: Suresh8 $conn = mysqli_connect($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 Làm cách nào để tìm nạp dữ liệu từ cơ sở dữ liệu trong PHP bằng OOP?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 để chèn dữ liệu vào cơ sở dữ liệu bằng OOP trong PHP?Cách chèn dữ liệu vào cơ sở dữ liệu bằng PHP Khái niệm OOPS . Đầu tiên tạo một biểu mẫu html. Mục lục. php. . Tạo cơ sở dữ liệu với tên demo. Bên trong cơ sở dữ liệu demo tạo bảng chèn dữ liệu. . Tạo chức năng trang php. php. Bên trong trang này, một lớp DB_con định nghĩa. . Định nghĩa một đối tượng và phân loại hàm chèn Khái niệm oops nào được sử dụng trong PHP?Lập trình hướng đối tượng trong PHP giúp các nhà phát triển xây dựng các ứng dụng web phức tạp và có thể tái sử dụng. Lập trình hướng đối tượng là một phong cách lập trình đề cập đến sự liên kết của các thành phần khác nhau và xoay quanh các khái niệm kế thừa, đa hình, đóng gói và trừu tượng hóa .
Làm cách nào để lấy dữ liệu từ cơ sở dữ liệu trong PHP và hiển thị trong bảng?php $connect=mysql_connect('localhost', 'root', 'mật khẩu'); |