Question

Trying to get a query that has both AND and OR to work in C#.

In SQL Server would be something like:

... where (Code = 'abc' OR Description = 'def') AND (Flag = 0)

With MongoVUE I seemed to have gotten it to work with this:

{ "$or" : [{ "Description" : /def/i }, { "Code" : /abc/i }], "$and": [{ "Flag" : 0 }] }

but can’t seem to get it with the C#:
tried this:

List<IMongoQuery> qryValue = new List<IMongoQuery>();
qryValue.Add(Query.EQ("Code", "abc"));
qryValue.Add(Query.EQ("Description", "def"));
qryValue.Add(Query.And(Query.EQ("Flag", 1)));
var query = Query.Or(qryValue.ToArray());

but get this back:

{ "$or" : [{ "Code" : "abc" }, { "Description" : "def" }, { "Flag" : 1 }] }

and this doesn’t give the correct results: missing the AND part.

Anyone can help with this?

Answer 1

You’re getting that back because you’re are putting all of your Query.EQ into the Query.Or on the last line. Passing in a single value to a Query.And doesn’t do anything; it’s the same as if you passed a single value to any other method. You haven’t and-ed it with anything.

You need to write it in code as you have above in SQL: respect the parenthesis.

Group your Or together first, and pass it as the first parameter to the And, followed by the single, additional clause for Flag.

var clauses = new[] { Query.EQ("Code", "abc"), Query.EQ("Description", "def") };
var query = Query.AND(Query.OR(clauses), Query.EQ("Flag", 1))

Something like that should work.