1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/clause/locking.go

@@ -0,0 +1,38 @@
+package clause
+
+const (
+	LockingStrengthUpdate    = "UPDATE"
+	LockingStrengthShare     = "SHARE"
+	LockingOptionsSkipLocked = "SKIP LOCKED"
+	LockingOptionsNoWait     = "NOWAIT"
+)
+
+type Locking struct {
+	Strength string
+	Table    Table
+	Options  string
+}
+
+// Name where clause name
+func (locking Locking) Name() string {
+	return "FOR"
+}
+
+// Build build where clause
+func (locking Locking) Build(builder Builder) {
+	builder.WriteString(locking.Strength)
+	if locking.Table.Name != "" {
+		builder.WriteString(" OF ")
+		builder.WriteQuoted(locking.Table)
+	}
+
+	if locking.Options != "" {
+		builder.WriteByte(' ')
+		builder.WriteString(locking.Options)
+	}
+}
+
+// MergeClause merge order by clauses
+func (locking Locking) MergeClause(clause *Clause) {
+	clause.Expression = locking
+}