MAPG-43 initial classes for DB handling

src/Database/Query/Modify.php

@@ -0,0 +1,157 @@
+<?php namespace MapGuesser\Database\Query;
+
+use MapGuesser\Interfaces\Database\IConnection;
+use MapGuesser\Interfaces\Database\IResultSet;
+use MapGuesser\Database\Utils;
+
+class Modify
+{
+    private IConnection $connection;
+
+    private string $table;
+
+    private string $idName = 'id';
+
+    private array $attributes = [];
+
+    private array $original = [];
+
+    private bool $autoIncrement = false;
+
+    public function __construct(IConnection $connection, string $table)
+    {
+        $this->connection = $connection;
+        $this->table = $table;
+    }
+
+    public function setIdName(string $idName): Modify
+    {
+        $this->idName = $idName;
+
+        return $this;
+    }
+
+    public function setAutoIncrement(bool $autoIncrement = true): Modify
+    {
+        $this->autoIncrement = $autoIncrement;
+
+        return $this;
+    }
+
+    public function fill(array $attributes): Modify
+    {
+        $this->attributes = array_merge($this->attributes, $attributes);
+
+        return $this;
+    }
+
+    public function set(string $name, $value): Modify
+    {
+        $this->attributes[$name] = $value;
+
+        return $this;
+    }
+
+    public function setId($id): Modify
+    {
+        $this->attributes[$this->idName] = $id;
+
+        return $this;
+    }
+
+    public function save(): void
+    {
+        if (isset($this->attributes[$this->idName])) {
+            $this->update();
+        } else {
+            $this->insert();
+        }
+    }
+
+    public function delete(): void
+    {
+        if (!isset($this->attributes[$this->idName])) {
+            throw new \Exception('No primary key specified!');
+        }
+
+        $query = 'DELETE FROM ' . Utils::backtick($this->table) . ' WHERE ' . Utils::backtick($this->idName) . '=?';
+
+        $stmt = $this->connection->prepare($query);
+        $stmt->execute([$this->idName => $this->attributes[$this->idName]]);
+    }
+
+    private function insert(): void
+    {
+        if (!$this->autoIncrement) {
+            $this->attributes[$this->idName] = $this->generateKey();
+        }
+
+        $set = $this->generateColumnsWithBinding(array_keys($this->attributes));
+
+        $query = 'INSERT INTO ' . Utils::backtick($this->table) . ' SET ' . $set;
+
+        $stmt = $this->connection->prepare($query);
+        $stmt->execute($this->attributes);
+
+        if ($this->autoIncrement) {
+            $this->attributes[$this->idName] = $this->connection->lastId();
+        }
+    }
+
+    private function update(): void
+    {
+        $diff = $this->generateDiff();
+
+        if (count($diff) === 0) {
+            return;
+        }
+
+        $set = $this->generateColumnsWithBinding(array_keys($diff));
+
+        $query = 'UPDATE ' . Utils::backtick($this->table) . ' SET ' . $set . ' WHERE ' . Utils::backtick($this->idName) . '=?';
+
+        $stmt = $this->connection->prepare($query);
+        $stmt->execute(array_merge($diff, [$this->idName => $this->attributes[$this->idName]]));
+    }
+
+    private function readFromDB(array $columns): void
+    {
+        $select = (new Select($this->connection, $this->table))
+            ->setIdName($this->idName)
+            ->whereId($this->attributes[$this->idName])
+            ->columns($columns);
+
+        $this->original = $select->execute()->fetch(IResultSet::FETCH_ASSOC);
+    }
+
+    private function generateDiff(): array
+    {
+        $this->readFromDB(array_keys($this->attributes));
+
+        $diff = [];
+
+        foreach ($this->attributes as $name => $value) {
+            $original = $this->original[$name];
+
+            if ($original != $value) {
+                $diff[$name] = $value;
+            }
+        }
+
+        return $diff;
+    }
+
+    public static function generateColumnsWithBinding(array $columns): string
+    {
+        array_walk($columns, function(&$value, $key) {
+            $value = Utils::backtick($value) . '=?';
+        });
+
+        return implode(',', $columns);
+    }
+
+    private function generateKey(): string
+    {
+        return substr(hash('sha256', serialize($this->attributes) . random_bytes(10) . microtime()), 0, 7);
+    }
+}