update

clauses/merge.go

@@ -0,0 +1,49 @@
+package clauses
+
+import (
+	"gorm.io/gorm/clause"
+)
+
+type Merge struct {
+	Table clause.Table
+	Using []clause.Interface
+	On    []clause.Expression
+}
+
+func (merge Merge) Name() string {
+	return "MERGE"
+}
+
+func MergeDefaultExcludeName() string {
+	return "exclude"
+}
+
+// Build build from clause
+func (merge Merge) Build(builder clause.Builder) {
+	clause.Insert{}.Build(builder)
+	builder.WriteString(" USING (")
+	for idx, iface := range merge.Using {
+		if idx > 0 {
+			builder.WriteByte(' ')
+		}
+		builder.WriteString(iface.Name())
+		builder.WriteByte(' ')
+		iface.Build(builder)
+	}
+	builder.WriteString(") ")
+	builder.WriteString(MergeDefaultExcludeName())
+	builder.WriteString(" ON (")
+	for idx, on := range merge.On {
+		if idx > 0 {
+			builder.WriteString(", ")
+		}
+		on.Build(builder)
+	}
+	builder.WriteString(")")
+}
+
+// MergeClause merge values clauses
+func (merge Merge) MergeClause(clause *clause.Clause) {
+	clause.Name = merge.Name()
+	clause.Expression = merge
+}