feat: add db config and setup

internal/database/database.go

@@ -0,0 +1,44 @@
+package database
+
+import (
+	"database/sql"
+	"fmt"
+	"os"
+	"time"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+var DB *sql.DB
+var dbName = os.Getenv("DB_NAME")
+var dbUser = os.Getenv("DB_USER")
+var dbPassword = os.Getenv("DB_PASSWORD")
+var dbHost = os.Getenv("DB_HOST")
+var dbPort = os.Getenv("DB_PORT")
+
+var Conn_string = fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?parseTime=true&charset=utf8mb4&collation=utf8mb4_unicode_ci", dbUser, dbPassword, dbHost, dbPort, dbName)
+
+func InitDB(dataSourceName string) error {
+	var err error
+
+	DB, err = sql.Open("mysql", dataSourceName)
+	if err != nil {
+		return err
+	}
+
+	DB.SetMaxOpenConns(25)
+	DB.SetMaxIdleConns(25)
+	DB.SetConnMaxLifetime(5 * time.Minute)
+
+	if err = DB.Ping(); err != nil {
+		return err
+	}
+	println("DB connected")
+	return nil
+}
+
+func CloseDB() {
+	if DB != nil {
+		DB.Close()
+	}
+}