1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/clause/set.go

@@ -0,0 +1,60 @@
+package clause
+
+import "sort"
+
+type Set []Assignment
+
+type Assignment struct {
+	Column Column
+	Value  interface{}
+}
+
+func (set Set) Name() string {
+	return "SET"
+}
+
+func (set Set) Build(builder Builder) {
+	if len(set) > 0 {
+		for idx, assignment := range set {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(assignment.Column)
+			builder.WriteByte('=')
+			builder.AddVar(builder, assignment.Value)
+		}
+	} else {
+		builder.WriteQuoted(Column{Name: PrimaryKey})
+		builder.WriteByte('=')
+		builder.WriteQuoted(Column{Name: PrimaryKey})
+	}
+}
+
+// MergeClause merge assignments clauses
+func (set Set) MergeClause(clause *Clause) {
+	copiedAssignments := make([]Assignment, len(set))
+	copy(copiedAssignments, set)
+	clause.Expression = Set(copiedAssignments)
+}
+
+func Assignments(values map[string]interface{}) Set {
+	keys := make([]string, 0, len(values))
+	for key := range values {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+
+	assignments := make([]Assignment, len(keys))
+	for idx, key := range keys {
+		assignments[idx] = Assignment{Column: Column{Name: key}, Value: values[key]}
+	}
+	return assignments
+}
+
+func AssignmentColumns(values []string) Set {
+	assignments := make([]Assignment, len(values))
+	for idx, value := range values {
+		assignments[idx] = Assignment{Column: Column{Name: value}, Value: Column{Table: "excluded", Name: value}}
+	}
+	return assignments
+}