diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a3ef4a..7f2bbe0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+### Features
+
+ * Implemented pdo methods.
+
 ## v0.0.0 (2024-04-23)
 
 ### Features
diff --git a/src/pdo.phel b/src/pdo.phel
index d759e3b..78d15d4 100644
--- a/src/pdo.phel
+++ b/src/pdo.phel
@@ -3,12 +3,22 @@
 
 (defstruct connection [pdo])
 
+(defn set-attribute
+  "Set an attribute"
+  [conn attribute value]
+  (php/-> (conn :pdo) (setAttribute attribute value)))
+
+(defn get-attribute
+  "Retrieve a database connection attribute"
+  [conn attribute]
+  (php/-> (conn :pdo) (getAttribute attribute)))
+
 (defn connect
   "Connect database and return connection object.
   Throws a PDOException if the attempt to connect to the requested database fails "
   [dsn & [username password options]]
   (let [conn (connection (php/new \PDO dsn username password options))]
-    (php/-> (conn :pdo) (setAttribute (php/:: \PDO ATTR_ERRMODE) (php/:: \PDO ERRMODE_EXCEPTION)))
+    (set-attribute conn (php/:: \PDO ATTR_ERRMODE) (php/:: \PDO ERRMODE_EXCEPTION))
     conn))
 
 (defn exec
@@ -46,13 +56,32 @@
   [conn string & [type]]
   (php/-> (conn :pdo) (quote string (or type (php/:: \PDO PARAM_STR)))))
 
+(defn last-insert-id
+  "Returns the ID of the last inserted row or sequence value"
+  [conn]
+  (php/intval (php/-> (conn :pdo) (lastInsertId))))
+
+(defn error-code
+  "Fetch the SQLSTATE associated with the last operation on the database handle"
+  [conn]
+  (php/intval (php/-> (conn :pdo) (errorCode))))
+
+(defn error-info
+  "Fetch extended error information associated with the last operation on the database handle"
+  [conn]
+  (let [[error-code driver-error-code driver-message] (values (php-array-to-map (php/-> (conn :pdo) (errorInfo))))]
+    [(php/intval error-code) (php/intval driver-error-code) driver-message]))
+
+(defn in-transaction
+  "Checks if inside a transaction"
+  [conn]
+  (php/-> (conn :pdo) (inTransaction)))
+
+(defn get-available-drivers
+  "Return an array of available PDO drivers"
+  [conn]
+  (values (php-array-to-map (php/-> (conn :pdo) (getAvailableDrivers)))))
+
 # not implement yet.
 
-#PDO::errorCode — Fetch the SQLSTATE associated with the last operation on the database handle
-#PDO::errorInfo — Fetch extended error information associated with the last operation on the database handle
-#PDO::getAttribute — Retrieve a database connection attribute
 #PDO::getAvailableDrivers — Return an array of available PDO drivers
-#PDO::inTransaction — Checks if inside a transaction
-#PDO::lastInsertId — Returns the ID of the last inserted row or sequence value
-#PDO::prepare — Prepares a statement for execution and returns a statement object
-#PDO::setAttribute — Set an attribute
diff --git a/tests/feature/pdo.phel b/tests/feature/pdo.phel
index c539d93..076a6c5 100644
--- a/tests/feature/pdo.phel
+++ b/tests/feature/pdo.phel
@@ -76,4 +76,65 @@
   (let [conn (pdo/connect "sqlite::memory:")]
     (is (= "'I''m fine.'" (pdo/quote conn "I'm fine.")))))
 
+(deftest test-last-insert-id
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (is (= 0 (pdo/exec
+               conn
+               "create table t1 (id integer primary key autoincrement, name varchr(10))")))
+    (is (= 1 (pdo/exec
+               conn
+               "insert into t1 (name) values ('phel')")))
+    (is (= 1 (pdo/last-insert-id conn)))))
+
+(deftest test-error-code
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (is (= 0 (pdo/exec
+               conn
+               "create table t1 (id integer primary key autoincrement, name varchr(10))")))
+    (is (= 1 (pdo/exec
+               conn
+               "insert into t1 (name) values ('phel')")))
+    (try
+      (pdo/exec
+        conn
+        "insert into t1 (id, name) values (1, 'php')")
+      (catch \PDOException e "error"))
+    (is (= 23000 (pdo/error-code conn)))))
 
+(deftest test-error-info
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (is (= 0 (pdo/exec
+               conn
+               "create table t1 (id integer primary key autoincrement, name varchr(10))")))
+    (is (= 1 (pdo/exec
+               conn
+               "insert into t1 (name) values ('phel')")))
+    (try
+      (pdo/exec
+        conn
+        "insert into t1 (id, name) values (1, 'php')")
+      (catch \PDOException e "error"))
+    (is (= [23000 19 "UNIQUE constraint failed: t1.id"] (pdo/error-info conn)))))
+
+(deftest test-attribute
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (pdo/set-attribute
+               conn
+               (php/:: \PDO ATTR_ERRMODE)
+               (php/:: \PDO ERRMODE_SILENT))
+    (is (= (php/:: \PDO ERRMODE_SILENT)
+           (pdo/get-attribute
+             conn
+             (php/:: \PDO ATTR_ERRMODE))))))
+
+(deftest test-in-transaction
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (is (= false (pdo/in-transaction conn)))
+    (is (pdo/begin conn))
+    (is (= true (pdo/in-transaction conn)))
+    (is (pdo/commit conn))
+    (is (= false (pdo/in-transaction conn)))))
+
+(deftest test-get-available-drivers
+  (let [conn (pdo/connect "sqlite::memory:")]
+    (is (= ["sqlite"] (pdo/get-available-drivers conn)))))