增加mongodb驱动，简单版本

dri/mongodb/mongodb.go

@@ -65,6 +65,32 @@ func (that *mongoDb) InsertMany(table string, data ...interface{}) Slice {
 
 }
 
+func (that *mongoDb) Update(table string, data Map, where Map) int64 {
+	collection := that.DataBase.Collection(table)
+	re, err := collection.UpdateMany(that.Ctx, where, data)
+
+	if err != nil {
+		that.LastErr = err
+		return 0
+	}
+
+	return re.ModifiedCount
+
+}
+
+func (that *mongoDb) Delete(table string, where Map) int64 {
+	collection := that.DataBase.Collection(table)
+	re, err := collection.DeleteMany(that.Ctx, where)
+
+	if err != nil {
+		that.LastErr = err
+		return 0
+	}
+
+	return re.DeletedCount
+
+}
+
 func (that *mongoDb) Get(table string, where Map) Map {
 	results := []Map{}
 	var cursor *mongo.Cursor
@@ -86,7 +112,11 @@ func (that *mongoDb) Get(table string, where Map) Map {
 		that.LastErr = err
 		return nil
 	}
-	return results[0]
+	if len(results) > 0 {
+
+		return results[0]
+	}
+	return nil
 }
 
 func (that mongoDb) Select(table string, where Map, page, pageRow int64) []Map {