lazy create mysql connecion

src/Database/Mysql/Connection.php

@@ -7,48 +7,52 @@ use mysqli;
 
 class Connection implements IConnection
 {
-    private mysqli $connection;
+    private string $host;
+    private string $user;
+    private string $password;
+    private string $db;
+    private int $port;
+    private string $socket;
+    private ?mysqli $connection = null;
 
     public function __construct(string $host, string $user, string $password, string $db, int $port = -1, string $socket = null)
     {
-        if ($port < 0) {
-            $port = (int) ini_get('mysqli.default_port');
-        }
-
-        if ($socket === null) {
-            $socket = (string) ini_get('mysqli.default_socket');
-        }
-
-        mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
-        $this->connection = new mysqli($host, $user, $password, $db, $port, $socket);
-        $this->connection->set_charset('utf8mb4');
+        $this->host = $host;
+        $this->user = $user;
+        $this->password = $password;
+        $this->db = $db;
+        $this->port = $port < 0 ? (int) ini_get('mysqli.default_port') : $port;
+        $this->socket = $socket === null ? (string) ini_get('mysqli.default_socket') : $socket;
     }
 
     public function __destruct()
     {
+        if ($this->connection === null) {
+            return;
+        }
         $this->connection->close();
     }
 
     public function startTransaction(): void
     {
-        $this->connection->autocommit(false);
+        $this->getConnection()->autocommit(false);
     }
 
     public function commit(): void
     {
-        $this->connection->commit();
-        $this->connection->autocommit(true);
+        $this->getConnection()->commit();
+        $this->getConnection()->autocommit(true);
     }
 
     public function rollback(): void
     {
-        $this->connection->rollback();
-        $this->connection->autocommit(true);
+        $this->getConnection()->rollback();
+        $this->getConnection()->autocommit(true);
     }
 
     public function query(string $query): ?IResultSet
     {
-        $result = $this->connection->query($query);
+        $result = $this->getConnection()->query($query);
 
         if ($result !== true) {
             return new ResultSet($result);
@@ -59,36 +63,51 @@ class Connection implements IConnection
 
     public function multiQuery(string $query): array
     {
-        $this->connection->multi_query($query);
+        $this->getConnection()->multi_query($query);
 
         $ret = [];
         do {
-            if ($result = $this->connection->store_result()) {
+            if ($result = $this->getConnection()->store_result()) {
                 $ret[] = new ResultSet($result);
             } else {
                 $ret[] = null;
             }
 
-            $this->connection->more_results();
-        } while ($this->connection->next_result());
+            $this->getConnection()->more_results();
+        } while ($this->getConnection()->next_result());
 
         return $ret;
     }
 
     public function prepare(string $query): IStatement
     {
-        $stmt = $this->connection->prepare($query);
+        $stmt = $this->getConnection()->prepare($query);
 
         return new Statement($stmt);
     }
 
     public function lastId(): int
     {
-        return $this->connection->insert_id;
+        return $this->getConnection()->insert_id;
     }
 
     public function getAffectedRows(): int
     {
-        return $this->connection->affected_rows;
+        return $this->getConnection()->affected_rows;
+    }
+
+    private function getConnection(): mysqli
+    {
+        if ($this->connection === null) {
+            $this->createConnection();
+        }
+        return $this->connection;
+    }
+
+    private function createConnection(): void
+    {
+        mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
+        $this->connection = new mysqli($this->host, $this->user, $this->password, $this->db, $this->port, $this->socket);
+        $this->connection->set_charset('utf8mb4');
     }
 }