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 một bản ghi trong PHP?Hàm fetch_row() / mysqli_fetch_row() tìm nạp một hàng từ tập kết quả và trả về dưới dạng một mảng liệt kê.
Làm cách nào để tìm nạp một dữ liệu từ cơ sở dữ liệu trong PHP?Truy xuất hoặc tìm nạp dữ liệu từ cơ sở dữ liệu trong PHP . CHỌN (các) tên_cột TỪ_tên_bảng $query = mysql_query("select * from tablename", $connection); $connection = mysql_connect("localhost", "root", ""); $db = mysql_select_db("công ty", kết nối $); $query = mysql_query("chọn * từ nhân viên", $connection); Làm cách nào để chỉ tìm nạp 1 hàng trong MySQL?Để chỉ trả về hàng đầu tiên phù hợp với truy vấn SELECT của bạn, bạn cần thêm mệnh đề LIMIT vào câu lệnh SELECT . Mệnh đề LIMIT được sử dụng để kiểm soát số lượng hàng được truy vấn của bạn trả về. Khi bạn thêm LIMIT 1 vào câu lệnh SELECT, thì chỉ một hàng sẽ được trả về.
Làm cách nào để tìm nạp một giá trị từ MySQL PHP?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. |