1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/clause/delete.go

@@ -0,0 +1,23 @@
+package clause
+
+type Delete struct {
+	Modifier string
+}
+
+func (d Delete) Name() string {
+	return "DELETE"
+}
+
+func (d Delete) Build(builder Builder) {
+	builder.WriteString("DELETE")
+
+	if d.Modifier != "" {
+		builder.WriteByte(' ')
+		builder.WriteString(d.Modifier)
+	}
+}
+
+func (d Delete) MergeClause(clause *Clause) {
+	clause.Name = ""
+	clause.Expression = d
+}