From f7bfdf58def6aadc922e1632f407d1418269a0d7 Mon Sep 17 00:00:00 2001
From: Evgeny Zinoviev <me@ch1p.io>
Date: Sat, 9 Jul 2022 19:40:17 +0300
Subject: initial

---
 engine/database/CommonDatabase.php   | 107 +++++++++++++++++++++++++++++++++++
 engine/database/MySQLConnection.php  |  79 ++++++++++++++++++++++++++
 engine/database/SQLiteConnection.php |  90 +++++++++++++++++++++++++++++
 3 files changed, 276 insertions(+)
 create mode 100644 engine/database/CommonDatabase.php
 create mode 100644 engine/database/MySQLConnection.php
 create mode 100644 engine/database/SQLiteConnection.php

(limited to 'engine/database')

diff --git a/engine/database/CommonDatabase.php b/engine/database/CommonDatabase.php
new file mode 100644
index 0000000..13ea79c
--- /dev/null
+++ b/engine/database/CommonDatabase.php
@@ -0,0 +1,107 @@
+<?php
+
+abstract class CommonDatabase {
+
+    abstract public function query(string $sql, ...$args);
+    abstract public function escape(string $s): string;
+    abstract public function fetch($q): ?array;
+    abstract public function fetchAll($q): ?array;
+    abstract public function fetchRow($q): ?array;
+    abstract public function result($q, int $field = 0);
+    abstract public function insertId(): ?int;
+    abstract public function numRows($q): ?int;
+
+    protected function prepareQuery(string $sql, ...$args): string {
+        global $config;
+        if (!empty($args)) {
+            $mark_count = substr_count($sql, '?');
+            $positions = array();
+            $last_pos = -1;
+            for ($i = 0; $i < $mark_count; $i++) {
+                $last_pos = strpos($sql, '?', $last_pos + 1);
+                $positions[] = $last_pos;
+            }
+            for ($i = $mark_count - 1; $i >= 0; $i--) {
+                $arg_val = $args[$i];
+                if (is_null($arg_val)) {
+                    $v = 'NULL';
+                } else {
+                    $v = '\''.$this->escape($arg_val) . '\'';
+                }
+                $sql = substr_replace($sql, $v, $positions[$i], 1);
+            }
+        }
+        if (!empty($config['db']['log']))
+            logDebug(__METHOD__.': ', $sql);
+        return $sql;
+    }
+
+    public function insert(string $table, array $fields) {
+        return $this->performInsert('INSERT', $table, $fields);
+    }
+
+    public function replace(string $table, array $fields) {
+        return $this->performInsert('REPLACE', $table, $fields);
+    }
+
+    protected function performInsert(string $command, string $table, array $fields) {
+        $names = [];
+        $values = [];
+        $count = 0;
+        foreach ($fields as $k => $v) {
+            $names[] = $k;
+            $values[] = $v;
+            $count++;
+        }
+
+        $sql = "{$command} INTO `{$table}` (`" . implode('`, `', $names) . "`) VALUES (" . implode(', ', array_fill(0, $count, '?')) . ")";
+        array_unshift($values, $sql);
+
+        return $this->query(...$values);
+    }
+
+    public function update(string $table, array $rows, ...$cond) {
+        $fields = [];
+        $args = [];
+        foreach ($rows as $row_name => $row_value) {
+            $fields[] = "`{$row_name}`=?";
+            $args[] = $row_value;
+        }
+        $sql = "UPDATE `$table` SET ".implode(', ', $fields);
+        if (!empty($cond)) {
+            $sql .= " WHERE ".$cond[0];
+            if (count($cond) > 1)
+                $args = array_merge($args, array_slice($cond, 1));
+        }
+        return $this->query($sql, ...$args);
+    }
+
+    public function multipleInsert(string $table, array $rows) {
+        list($names, $values) = $this->getMultipleInsertValues($rows);
+        $sql = "INSERT INTO `{$table}` (`".implode('`, `', $names)."`) VALUES ".$values;
+        return $this->query($sql);
+    }
+
+    public function multipleReplace(string $table, array $rows) {
+        list($names, $values) = $this->getMultipleInsertValues($rows);
+        $sql = "REPLACE INTO `{$table}` (`".implode('`, `', $names)."`) VALUES ".$values;
+        return $this->query($sql);
+    }
+
+    protected function getMultipleInsertValues(array $rows): array {
+        $names = [];
+        $sql_rows = [];
+        foreach ($rows as $i => $fields) {
+            $row_values = [];
+            foreach ($fields as $field_name => $field_val) {
+                if ($i == 0) {
+                    $names[] = $field_name;
+                }
+                $row_values[] = $this->escape($field_val);
+            }
+            $sql_rows[] = "('".implode("', '", $row_values)."')";
+        }
+        return [$names, implode(', ', $sql_rows)];
+    }
+
+}
\ No newline at end of file
diff --git a/engine/database/MySQLConnection.php b/engine/database/MySQLConnection.php
new file mode 100644
index 0000000..9b473cb
--- /dev/null
+++ b/engine/database/MySQLConnection.php
@@ -0,0 +1,79 @@
+<?php
+
+class MySQLConnection extends CommonDatabase {
+
+    protected ?mysqli $link = null;
+
+    public function __construct(
+        protected string $host,
+        protected string $user,
+        protected string $password,
+        protected string $database) {}
+
+    public function __destruct() {
+        if ($this->link)
+            $this->link->close();
+    }
+
+    public function connect(): bool {
+        $this->link = new mysqli();
+        return !!$this->link->real_connect($this->host, $this->user, $this->password, $this->database);
+    }
+
+    public function query(string $sql, ...$args): mysqli_result|bool {
+        $sql = $this->prepareQuery($sql, ...$args);
+        $q = $this->link->query($sql);
+        if (!$q)
+            logError(__METHOD__.': '.$this->link->error."\n$sql\n".backtrace(1));
+        return $q;
+    }
+
+    public function fetch($q): ?array {
+        $row = $q->fetch_assoc();
+        if (!$row) {
+            $q->free();
+            return null;
+        }
+        return $row;
+    }
+
+    public function fetchAll($q): ?array {
+        if (!$q)
+            return null;
+        $list = [];
+        while ($f = $q->fetch_assoc()) {
+            $list[] = $f;
+        }
+        $q->free();
+        return $list;
+    }
+
+    public function fetchRow($q): ?array {
+        return $q?->fetch_row();
+    }
+
+    public function result($q, $field = 0) {
+        return $q?->fetch_row()[$field];
+    }
+
+    public function insertId(): int {
+        return $this->link->insert_id;
+    }
+
+    public function numRows($q): ?int {
+        return $q?->num_rows;
+    }
+
+    // public function affectedRows() {
+    //     return $this->link->affected_rows;
+    // }
+    //
+    // public function foundRows() {
+    //     return $this->fetch($this->query("SELECT FOUND_ROWS() AS `count`"))['count'];
+    // }
+
+    public function escape(string $s): string {
+        return $this->link->real_escape_string($s);
+    }
+
+}
diff --git a/engine/database/SQLiteConnection.php b/engine/database/SQLiteConnection.php
new file mode 100644
index 0000000..f124ced
--- /dev/null
+++ b/engine/database/SQLiteConnection.php
@@ -0,0 +1,90 @@
+<?php
+
+class SQLiteConnection extends CommonDatabase {
+
+    const SCHEMA_VERSION = 2;
+
+    protected SQLite3 $link;
+
+    public function __construct(string $db_path) {
+        $will_create = !file_exists($db_path);
+        $this->link = new SQLite3($db_path);
+        if ($will_create)
+            setperm($db_path);
+        $this->link->enableExceptions(true);
+        $this->upgradeSchema();
+    }
+
+    protected function upgradeSchema() {
+        $cur = $this->getSchemaVersion();
+        if ($cur == self::SCHEMA_VERSION)
+            return;
+
+        if ($cur < 1) {
+            $this->link->exec("CREATE TABLE users (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                username TEXT,
+                password TEXT
+            )");
+        }
+        if ($cur < 2) {
+            $this->link->exec("CREATE TABLE vk_processed (
+                last_message_time INTEGER
+            )");
+            $this->link->exec("INSERT INTO vk_processed (last_message_time) VALUES (0)");
+        }
+        $this->syncSchemaVersion();
+    }
+
+    protected function getSchemaVersion() {
+        return $this->link->query("PRAGMA user_version")->fetchArray()[0];
+    }
+
+    protected function syncSchemaVersion() {
+        $this->link->exec("PRAGMA user_version=".self::SCHEMA_VERSION);
+    }
+
+    public function query(string $sql, ...$params): SQLite3Result {
+        return $this->link->query($this->prepareQuery($sql, ...$params));
+    }
+
+    public function exec(string $sql, ...$params) {
+        return $this->link->exec($this->prepareQuery($sql, ...$params));
+    }
+
+    public function querySingle(string $sql, ...$params) {
+        return $this->link->querySingle($this->prepareQuery($sql, ...$params));
+    }
+
+    public function querySingleRow(string $sql, ...$params) {
+        return $this->link->querySingle($this->prepareQuery($sql, ...$params), true);
+    }
+
+    public function insertId(): int {
+        return $this->link->lastInsertRowID();
+    }
+
+    public function escape(string $s): string {
+        return $this->link->escapeString($s);
+    }
+
+    public function fetch($q): ?array {
+        // TODO: Implement fetch() method.
+    }
+
+    public function fetchAll($q): ?array {
+        // TODO: Implement fetchAll() method.
+    }
+
+    public function fetchRow($q): ?array {
+        // TODO: Implement fetchRow() method.
+    }
+
+    public function result($q, int $field = 0) {
+        return $q?->fetchArray()[$field];
+    }
+
+    public function numRows($q): ?int {
+        // TODO: Implement numRows() method.
+    }
+}
\ No newline at end of file
-- 
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