support pgsql model generation

providers/database/postgres.go

@@ -0,0 +1,36 @@
+package database
+
+import (
+	"atom/providers/config"
+	"log"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/schema"
+)
+
+func NewPostgres(conf *config.PostgreSQL) (*gorm.DB, error) {
+	dbConfig := postgres.Config{
+		DSN: conf.DSN(), // DSN data source name
+	}
+	log.Println("PostgreSQL DSN: ", dbConfig.DSN)
+
+	gormConfig := gorm.Config{
+		NamingStrategy: schema.NamingStrategy{
+			TablePrefix:   conf.Prefix,
+			SingularTable: conf.Singular,
+		},
+		DisableForeignKeyConstraintWhenMigrating: true,
+	}
+
+	db, err := gorm.Open(postgres.New(dbConfig), &gormConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	sqlDB, _ := db.DB()
+	sqlDB.SetMaxIdleConns(conf.MaxIdleConns)
+	sqlDB.SetMaxOpenConns(conf.MaxOpenConns)
+
+	return db, err
+}