1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/callbacks/transaction.go

@@ -0,0 +1,32 @@
+package callbacks
+
+import (
+	"gorm.io/gorm"
+)
+
+func BeginTransaction(db *gorm.DB) {
+	if !db.Config.SkipDefaultTransaction && db.Error == nil {
+		if tx := db.Begin(); tx.Error == nil {
+			db.Statement.ConnPool = tx.Statement.ConnPool
+			db.InstanceSet("gorm:started_transaction", true)
+		} else if tx.Error == gorm.ErrInvalidTransaction {
+			tx.Error = nil
+		} else {
+			db.Error = tx.Error
+		}
+	}
+}
+
+func CommitOrRollbackTransaction(db *gorm.DB) {
+	if !db.Config.SkipDefaultTransaction {
+		if _, ok := db.InstanceGet("gorm:started_transaction"); ok {
+			if db.Error != nil {
+				db.Rollback()
+			} else {
+				db.Commit()
+			}
+
+			db.Statement.ConnPool = db.ConnPool
+		}
+	}
+}