新增数据库连接及gorm框架

libs/database.go

@@ -0,0 +1,58 @@
+package libs
+
+import (
+	"fmt"
+	"go-desk-service/config"
+	"log"
+	"time"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+var DB *gorm.DB
+
+func Connect() (*gorm.DB, error) {
+	appConfig, dberr := config.LoadConfig()
+	if dberr != nil {
+		fmt.Println("读取配置失败")
+	}
+
+	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%d sslmode=disable TimeZone=Asia/Shanghai",
+		appConfig.Database.Host,
+		appConfig.Database.Username,
+		appConfig.Database.Password,
+		appConfig.Database.Database,
+		appConfig.Database.Port)
+	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to database: %w", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get sql.DB: %w", err)
+	}
+	sqlDB.SetMaxIdleConns(10)
+	sqlDB.SetMaxOpenConns(100)
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
+	log.Println("Database connection established")
+	DB = db
+	return db, nil
+}
+
+func GetDB() *gorm.DB {
+	if DB == nil {
+		panic("database connection is not initialized")
+	}
+	return DB
+}
+
+func Close() error {
+	sqlDB, err := DB.DB()
+	if err != nil {
+		return err
+	}
+	return sqlDB.Close()
+}