create postgres connection

config/config.go

@@ -18,6 +18,15 @@ type config struct {
         DBNAME string
         OPTION string
     }
+    Postgres struct {
+        DBMS   string
+        USER   string
+        PASS   string
+        HOST   string
+        PORT   string
+        DBNAME string
+        OPTION string
+    }
 }
 
 var C config
@@ -31,9 +40,9 @@ func LoadConfig() {
     viper.AutomaticEnv()
 
     if err := viper.ReadInConfig(); err != nil {
-    fmt.Println("load config error")
-    fmt.Println(err)
-    os.Exit(1)
+        fmt.Println("load config error")
+        fmt.Println(err)
+        os.Exit(1)
     }
 
     if err := viper.Unmarshal(&Conf); err != nil {

config/config.yml

@@ -6,3 +6,11 @@ mysql:
     port: "3306"
     dbname: "goSample"
     option: "?charset=utf8&parseTime=True&loc=Local"
+postgres:
+    dbms: "postgres"
+    user: "user"
+    pass: "secret"
+    host: "0.0.0.0"
+    port: "5432"
+    dbname: "goSample"
+    option: "sslmode=disable"

infrastructure/datastore/dbPostgreSQL.go

@@ -0,0 +1,31 @@
+package datastore
+
+import (
+    "fmt"
+
+    "github.com/jinzhu/gorm"
+    _ "github.com/jinzhu/gorm/dialects/postgres"
+
+    "api/config"
+)
+
+func NewPostgreSQL() *gorm.DB {
+    connectString := fmt.Sprintf(
+        "host=%s port=%s user=%s dbname= %s password=%s %s",
+        config.C.Postgres.HOST,
+        config.C.Postgres.PORT,
+        config.C.Postgres.USER,
+        config.C.Postgres.DBNAME,
+        config.C.Postgres.PASS,
+        config.C.Postgres.OPTION,
+    )
+    db, err := gorm.Open(config.C.Postgres.DBMS, connectString)
+
+    if err != nil {
+        panic(err.Error())
+    }
+
+    db.LogMode(true)
+
+    return db
+}