Modify Model become abstract, create database interactions and do test.

App/Models/Post.php

@@ -0,0 +1,153 @@
+<?php
+namespace App\Models;
+
+class Post extends \Core\Model
+{
+    public function __construct()
+    {
+        $this->createTable(
+            'pengumuman',
+            [
+                'id int(3) NOT NULL AUTO_INCREMENT',
+                'category int(3) NOT NULL',
+                'created_at timestamp DEFAULT CURRENT_TIMESTAMP',
+                'expired_at timestamp NOT NULL',
+                'creator int(3) NOT NULL',
+                'edited_at timestamp',
+                'editor timestamp',
+                'content varchar(255) NOT NULL',
+                'PRIMARY KEY (id)'
+            ]
+        );
+    }
+
+    public function showAll()
+    {
+        try {
+            $db = static::connectDB();
+
+            $sql = "SELECT * FROM pengumuman ORDER BY created_at";
+
+            if ($stmt = $db->query($sql)) {
+                $result = $stmt->fetchAll(\PDO::FETCH_ASSOC);
+                return true;
+            }
+            return false;
+        } catch (PDOException $e) {
+            echo $e->getMessage();
+        }
+    }
+
+    public function showSingle($id)
+    {
+        try {
+            $db = static::connectDB();
+
+            $sql = "SELECT * FROM pengumuman WHERE id = ?";
+
+            $query = $db->prepare($sql);
+
+            if ($query->execute([$id])) {
+                if ($query->rowCount() === 1) {
+                    $result = $query->fetchAll(\PDO::FETCH_ASSOC);
+                    // For tests
+                    return true;
+                }
+            }
+            return false;
+        } catch (PDOException $e) {
+            echo $e->getMessage();
+        }
+    }
+
+    public function entry($fields, $vals)
+    {
+        if (count($fields) && count($vals) && count($fields) === count($vals)) {
+            $keys = '`'.implode('`, `', $fields).'`';
+
+            $x = 1;
+            $values = '';
+            foreach ($vals as $val) {
+                $values .= '?';
+                if ($x < count($vals)) {
+                    $values .= ', ';
+                }
+                $x++;
+            }
+
+            try {
+                $db = static::connectDB();
+
+                $sql = "INSERT INTO pengumuman ({$keys}) VALUES ({$values})";
+
+                $query = $db->prepare($sql);
+
+                $x = 1;
+
+                foreach ($vals as $val) {
+                    $query->bindValue($x, urldecode($val));
+                    $x++;
+                }
+
+                if ($query->execute()) {
+                    return true;
+                }
+                return false;
+            } catch (PDOException $e) {
+                echo $e->getMessage();
+            }
+        }
+    }
+
+    public function update($args, $id)
+    {
+        if (count($args)) {
+            $keys = array_keys($args);
+
+            $fields = [];
+            foreach ($keys as $key) {
+                $fields[] = $key.' = ?';
+            }
+
+            try {
+                $db = static::connectDB();
+
+                $sql = "UPDATE pengumuman SET ".implode(', ', $fields)." WHERE id = ?";
+
+                $query = $db->prepare($sql);
+                $x = 1;
+                foreach ($args as $value) {
+                    $query->bindValue($x, $value);
+                    $x++;
+                }
+                $query->bindValue($x, $id);
+
+                if ($query->execute()) {
+                    return true;
+                }
+                return false;
+            } catch (PDOException $e) {
+                echo $e->getMessage();
+            }
+        }
+    }
+
+    public function delete($id)
+    {
+        try {
+            $db = static::connectDB();
+
+            $sql = "DELETE FROM pengumuman WHERE id = ?";
+
+            $query = $db->prepare($sql);
+
+            if ($query->execute([$id])) {
+                return true;
+            }
+            return false;
+        } catch (PDOException $e) {
+            echo $e->getMessage();
+        }
+
+    }
+}