問(wèn)題描述

<?phpheader("Content-Type: text/html;charset=utf-8");$servername = "localhost";$username = "root";$password = "168168";$dbname = "mypet"; //數(shù)據(jù)庫(kù)名// 創(chuàng)建連接$conn = new mysqli($servername, $username, $password, $dbname);$conn->query('set names utf8');// Check connectionif ($conn->connect_error) { die("連接失敗: " . $conn->connect_error);} $sql = "SELECT * FROM `user`";// $sql = "SELECT * FROM `mypet`";// $sql = "SELECT * FROM `ggbond`";//查詢語(yǔ)句$result = $conn->query($sql);$arr=Array();$arr1=Array();if ($result->num_rows > 0) { // 輸出數(shù)據(jù) while($row = $result->fetch_assoc()) {$arr=array( 'PersonalName'=>$row['PersonalName'] 'AddPet_PetName_b'=>$row['AddPet_PetName_b'], 'IssueText'=>$row['IssueText'], 'Like'=>$row['Like']); //查詢項(xiàng)目$arr1[]=$arr; }}else { echo "讀取成功";}echo json_encode($arr1);$conn->close();?>

問(wèn)題解答

什么意思？下次貼代碼，截圖貼，如果是想聯(lián)表查用join,如果是兩個(gè)無(wú)關(guān)聯(lián)的表就查2次唄 https://www.runoob.com/mysql/mysql-join.html 這是聯(lián)表查的教程