api allow specify id

api.php

@@ -3,18 +3,42 @@
 header('Content-type: application/json');
 //载入数据库文件
 require("data.php");
-//查询随机一条记录
-$sql = "SELECT * FROM soul ORDER BY RAND() LIMIT 1";
+//检查是否有指定id
+if (isset($_GET['id'])) {
+    $id = $_GET['id'];
+    //查询指定id的记录
+    $sql = "SELECT * FROM soul WHERE id = $id";
+} else {
+    //查询随机一条记录
+    $sql = "SELECT * FROM soul ORDER BY RAND() LIMIT 1";
+}
 $result = mysqli_query($conn, $sql);
-$row = mysqli_fetch_assoc($result);
-//输出json
-echo json_encode(array(
-    "code" => 0,
-    "message" => "OK",
-    "data" => array(
-        "id" => $row["id"],
-        "title" => $row["title"],
-        "author" => $row["author"],
-        "from" => $row["from"]
-    )
-));
+//检查是否查询成功
+if ($result) {
+    $row = mysqli_fetch_assoc($result);
+    //检查是否找到记录
+    if (mysqli_num_rows($result) > 0) {
+        echo json_encode(array(
+            "code" => 0,
+            "message" => "OK",
+            "data" => array(
+                "id" => $row["id"],
+                "title" => $row["title"],
+                "author" => $row["author"],
+                "from" => $row["from"]
+            )
+        ));
+    } else {
+        echo json_encode(array(
+            "code" => 1,
+            "message" => "No results found",
+            "data" => null
+        ));
+    }
+} else {
+    echo json_encode(array(
+        "code" => 2,
+        "message" => "Error executing query",
+        "data" => null
+    ));
+}