Golang uses Mongo driver operation - query (Advanced)

For more complex queries, I can't think of any occasion to use them , So I will add it slowly when I have it .

and and or Combine ：

//  Show complex and and or Relation combination query 
func AdvanceAndOr(mongo *mongo.Database, ctx context.Context) {
    
	//  Usually our conditions are implicit and Relationship , But because it needs to be used twice at the same time $or, So it is necessary to display and use and
	filter := bson.M{
    "$and": bson.A{
    bson.M{
    "$or": bson.A{
    bson.M{
    "int32": math.MaxInt32}, bson.M{
    "int32": math.MaxInt32 - 1}}}, bson.M{
    "$or": bson.A{
    bson.M{
    "boolean": true}, bson.M{
    "boolean": false}}}}}
	//  Query data , And parse it into a structure 
	cur, _ := mongo.Collection("test").Find(ctx, filter)
	//  Traversal data 
	for cur.TryNext(ctx) {
    
		result, _ := cur.Current.Elements()
		fmt.Println(result)
	}
	cur.Close(ctx)
}

In my opinion, complex queries are often combined with various keywords , therefore , Here are some keywords that have not been practiced , For future reference .

keyword	explain	link
ne	It's not equal to	link
not	Reverse results , All documents except matching criteria	link
nor	Return documents that do not match each condition or do not have this field , It's very similar to the one above , But there's a difference	link
exists	Documents with specified fields	link
type	Match field type	link
expr	Aggregate expression , It's very powerful , Very complicated	link
jsonSchema	Document verification rules , The data of the document itself has no restrictions , Use this to limit	link
mod	modulus , Use remainder as query condition	link
regex	Regular Expression Matching	link
text Text search , But you need to build an index , impractical	link