diff --git a/.env b/.env
new file mode 100644
index 0000000..697542c
--- /dev/null
+++ b/.env
@@ -0,0 +1,14 @@
+# server configuration
+# --------------------
+
+PORT=4000
+ENVIRONMENT=dev # option : dev, stage, prod
+
+# PostgreSQL Database Codnfiguration
+# ---------------------------------
+DB_HOST=202.46.20.160
+DB_PORT=2003
+DB_USER=5803025014
+DB_PASSWORD=5803025014
+DB_NAME=5803025014
+DB_SSLMODE=disable # disable or quitel` 
\ No newline at end of file
diff --git a/CMD b/CMD
deleted file mode 100644
index e69de29..0000000
diff --git a/Internal b/Internal
deleted file mode 100644
index e69de29..0000000
diff --git a/api/handler/handler.go b/api/handler/handler.go
new file mode 100644
index 0000000..abeebd1
--- /dev/null
+++ b/api/handler/handler.go
@@ -0,0 +1 @@
+package handler
diff --git a/cmd/server/main.go b/cmd/server/main.go
new file mode 100644
index 0000000..7503987
--- /dev/null
+++ b/cmd/server/main.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/jackc/pgx/v5"
+)
+
+func main() {
+	// urlExample := "postgres://username:password@localhost:5432/database_name"
+	conn, err := pgx.Connect(context.Background(), os.Getenv("DATABASE_URL"))
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
+		os.Exit(1)
+	}
+	defer conn.Close(context.Background())
+
+	var name string
+	var weight int64
+	err = conn.QueryRow(context.Background(), "select name, weight from widgets where id=$1", 42).Scan(&name, &weight)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "QueryRow failed: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(name, weight)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..d4c1282
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module 5803025015/w04
+
+go 1.27.0
+
+require (
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/pgx/v5 v5.11.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..8dd7169
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
+github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.11.0 h1:IzBBtyK9AHqf98cctWFifYSci2hgQR/cd56wB4p+ogg=
+github.com/jackc/pgx/v5 v5.11.0/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/config/config.go b/internal/config/config.go
new file mode 100644
index 0000000..d912156
--- /dev/null
+++ b/internal/config/config.go
@@ -0,0 +1 @@
+package config
diff --git a/internal/database/database.go b/internal/database/database.go
new file mode 100644
index 0000000..636bab8
--- /dev/null
+++ b/internal/database/database.go
@@ -0,0 +1 @@
+package database
diff --git a/pkg/mypackage/mypackage.go b/pkg/mypackage/mypackage.go
new file mode 100644
index 0000000..0ae4d9a
--- /dev/null
+++ b/pkg/mypackage/mypackage.go
@@ -0,0 +1 @@
+package mypackage