diff --git a/sqlite3.go b/sqlite3.go
index 25b646f..f879718 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -198,11 +198,11 @@ type SQLiteResult struct {
 }
 
 func (r *SQLiteResult) LastInsertId() (int64, error) {
-	return int64(C.sqlite3_last_insert_rowid(r.s.s)), nil
+	return int64(C.sqlite3_last_insert_rowid(r.s.c.db)), nil
 }
 
 func (r *SQLiteResult) RowsAffected() (int64, error) {
-	return int64(C.sqlite3_changes(r.s.s)), nil
+	return int64(C.sqlite3_changes(r.s.c.db)), nil
 }
 
 func (s *SQLiteStmt) Exec(args []interface{}) (driver.Result, error) {
diff --git a/sqlite3_test.go b/sqlite3_test.go
index c46c2e3..ede867c 100644
--- a/sqlite3_test.go
+++ b/sqlite3_test.go
@@ -1,7 +1,6 @@
 package sqlite
 
 import (
-	"fmt"
 	"testing"
 	"exp/sql"
 	"os"
@@ -10,7 +9,7 @@ import (
 func TestOpen(t *testing.T) {
 	db, err := sql.Open("sqlite3", "./foo.db")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to open database:", err)
 		return
 	}
 	defer os.Remove("./foo.db")
@@ -30,7 +29,7 @@ func TestOpen(t *testing.T) {
 func TestInsert(t *testing.T) {
 	db, err := sql.Open("sqlite3", "./foo.db")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to open database:", err)
 		return
 	}
 	defer os.Remove("./foo.db")
@@ -42,15 +41,20 @@ func TestInsert(t *testing.T) {
 		return
 	}
 
-	_, err = db.Exec("insert into foo(id) values(123)")
+	res, err := db.Exec("insert into foo(id) values(123)")
 	if err != nil {
 		t.Errorf("Failed to insert record:", err)
 		return
 	}
+	affected, _ := res.RowsAffected()
+	if affected != 1 {
+		t.Errorf("Expected %d for affected rows, but %d:", 1, affected)
+		return
+	}
 
 	rows, err := db.Query("select id from foo")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to select records:", err)
 		return
 	}
 	defer rows.Close()
@@ -67,7 +71,7 @@ func TestInsert(t *testing.T) {
 func TestUpdate(t *testing.T) {
 	db, err := sql.Open("sqlite3", "./foo.db")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to open database:", err)
 		return
 	}
 	defer os.Remove("./foo.db")
@@ -79,21 +83,52 @@ func TestUpdate(t *testing.T) {
 		return
 	}
 
-	_, err = db.Exec("insert into foo(id) values(123)")
+	res, err := db.Exec("insert into foo(id) values(123)")
 	if err != nil {
 		t.Errorf("Failed to insert record:", err)
 		return
 	}
+	expected, err := res.LastInsertId()
+	if err != nil {
+		t.Errorf("Failed to get LastInsertId:", err)
+		return
+	}
+	affected, _ := res.RowsAffected()
+	if err != nil {
+		t.Errorf("Failed to get RowsAffected:", err)
+		return
+	}
+	if affected != 1 {
+		t.Errorf("Expected %d for affected rows, but %d:", 1, affected)
+		return
+	}
 
-	_, err = db.Exec("update foo set id = 234")
+	res, err = db.Exec("update foo set id = 234")
 	if err != nil {
 		t.Errorf("Failed to update record:", err)
 		return
 	}
+	lastId, err := res.LastInsertId()
+	if err != nil {
+		t.Errorf("Failed to get LastInsertId:", err)
+		return
+	}
+	if expected != lastId {
+		t.Errorf("Expected %q for last Id, but %q:", expected, lastId)
+	}
+	affected, _ = res.RowsAffected()
+	if err != nil {
+		t.Errorf("Failed to get RowsAffected:", err)
+		return
+	}
+	if affected != 1 {
+		t.Errorf("Expected %d for affected rows, but %d:", 1, affected)
+		return
+	}
 
 	rows, err := db.Query("select id from foo")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to select records:", err)
 		return
 	}
 	defer rows.Close()
@@ -110,7 +145,7 @@ func TestUpdate(t *testing.T) {
 func TestDelete(t *testing.T) {
 	db, err := sql.Open("sqlite3", "./foo.db")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to select records:", err)
 		return
 	}
 	defer os.Remove("./foo.db")
@@ -122,21 +157,50 @@ func TestDelete(t *testing.T) {
 		return
 	}
 
-	_, err = db.Exec("insert into foo(id) values(123)")
+	res, err := db.Exec("insert into foo(id) values(123)")
 	if err != nil {
 		t.Errorf("Failed to insert record:", err)
 		return
 	}
+	expected, err := res.LastInsertId()
+	if err != nil {
+		t.Errorf("Failed to get LastInsertId:", err)
+		return
+	}
+	affected, err := res.RowsAffected()
+	if err != nil {
+		t.Errorf("Failed to get RowsAffected:", err)
+		return
+	}
+	if affected != 1 {
+		t.Errorf("Expected %d for cout of affected rows, but %q:", 1, affected)
+	}
 
-	_, err = db.Exec("delete from foo where id = 123")
+	res, err = db.Exec("delete from foo where id = 123")
 	if err != nil {
 		t.Errorf("Failed to delete record:", err)
 		return
 	}
+	lastId, err := res.LastInsertId()
+	if err != nil {
+		t.Errorf("Failed to get LastInsertId:", err)
+		return
+	}
+	if expected != lastId {
+		t.Errorf("Expected %q for last Id, but %q:", expected, lastId)
+	}
+	affected, err = res.RowsAffected()
+	if err != nil {
+		t.Errorf("Failed to get RowsAffected:", err)
+		return
+	}
+	if affected != 1 {
+		t.Errorf("Expected %d for cout of affected rows, but %q:", 1, affected)
+	}
 
 	rows, err := db.Query("select id from foo")
 	if err != nil {
-		fmt.Println(err)
+		t.Errorf("Failed to select records:", err)
 		return
 	}
 	defer rows.Close()