Add Upsert 方法

dbpool.go

@@ -143,10 +143,22 @@ func (this *dbPool) Replace(
 func (this *dbPool) Upsert(
 	dataSource string,
 	tblName string,
-	whereKv map[string]string,
+	whereKv [][]string,
-	updateKv map[string]string,
+	updateKv [][]string,
-	insertKv map[string]string,
+	insertKv [][]string,
 	cb ExecResultCb) {
+	this.OrmSelectOne(dataSource, tblName, whereKv,
+		func(err error, ds *DataSet) {
+			if err != nil {
+				cb(err, 0, 0)
+				return
+			}
+			if ds.Next() {
+				this.Update(dataSource, tblName, updateKv, whereKv, cb)
+			} else {
+				this.Insert(dataSource, tblName, insertKv, cb)
+			}
+		})
 }
 
 func (this *dbPool) PageQuery(