diff --git a/CHANGELOG.md b/CHANGELOG.md
index dcbc294f5..c7e82cd77 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@
 - Enh #878: Realize `ColumnBuilder` class (@Tigrov)
 - Enh #881: Refactor `ColumnSchemaInterface` and `AbstractColumnSchema` (@Tigrov)
 - End #882: Move `ArrayColumnSchema` and `StructuredColumnSchema` classes from `db-pgsql` package (@Tigrov)
+- Enh #885: Refactor `AbstractDsn` class (@Tigrov)
 
 ## 1.3.0 March 21, 2024
 
diff --git a/src/Connection/AbstractDsn.php b/src/Connection/AbstractDsn.php
index f8895c097..8689a04f2 100644
--- a/src/Connection/AbstractDsn.php
+++ b/src/Connection/AbstractDsn.php
@@ -6,8 +6,6 @@
 
 use Stringable;
 
-use function implode;
-
 /**
  * It's typically used to parse a DSN string, which is a string that has all the necessary information to connect
  * to a database, such as the database driver, hostname, database name, port, and options.
@@ -17,37 +15,37 @@
 abstract class AbstractDsn implements DsnInterface, Stringable
 {
     /**
-     * @psalm-param string[] $options
+     * @param string $driver The database driver name.
+     * @param string $host The database host name or IP address.
+     * @param string|null $databaseName The database name to connect to.
+     * @param string|null $port The database port. Null if isn't set.
+     * @param string[] $options The database connection options. Default value to an empty array.
+     *
+     * @psalm-param array<string,string> $options
      */
     public function __construct(
-        private string $driver,
-        private string $host,
-        private string|null $databaseName = null,
-        private string|null $port = null,
-        private array $options = []
+        private readonly string $driver,
+        private readonly string $host,
+        private readonly string|null $databaseName = null,
+        private readonly string|null $port = null,
+        private readonly array $options = []
     ) {
     }
 
     public function asString(): string
     {
-        $dsn = "$this->driver:" . "host=$this->host";
+        $dsn = "$this->driver:host=$this->host";
 
         if ($this->databaseName !== null && $this->databaseName !== '') {
-            $dsn .= ';' . "dbname=$this->databaseName";
+            $dsn .= ";dbname=$this->databaseName";
         }
 
         if ($this->port !== null) {
-            $dsn .= ';' . "port=$this->port";
+            $dsn .= ";port=$this->port";
         }
 
-        $parts = [];
-
         foreach ($this->options as $key => $value) {
-            $parts[] = "$key=$value";
-        }
-
-        if (!empty($parts)) {
-            $dsn .= ';' . implode(';', $parts);
+            $dsn .= ";$key=$value";
         }
 
         return $dsn;
@@ -86,7 +84,9 @@ public function getHost(): string
     }
 
     /**
-     * @return array The database connection options. Default value to an empty array.
+     * @return string[] The database connection options. Default value to an empty array.
+     *
+     * @psalm-return array<string,string>
      */
     public function getOptions(): array
     {