Does Dapper support the like operator?

Solution 1:

Try:

term = "whateverterm";
var encodeForLike = term => term.Replace("[", "[[]").Replace("%", "[%]");

string term = "%" + encodeForLike(term) + "%";
var data = conn.Query(@"
   select top 25 
  Term as Label, 
  Type, 
  ID 
  from SearchTerms 
  WHERE Term like @term", 
  new { term });

There is nothing special about like operators, you never want your params inside string literals, they will not work, instead they will be interpreted as a string.

note

The hard-coded example in your second snippet is strongly discouraged, besides being a huge problem with sql injection, it can cause dapper to leak.

caveat

Any like match that is leading with a wildcard is not SARGable, which means it is slow and will require an index scan.

Solution 2:

Best way to use this to add concat function in query as it save in sql injecting as well, but concat function is only support above than sql 2012

string query = "SELECT * from country WHERE Name LIKE CONCAT('%',@name,'%');"
var results = connection.query<country>(query, new {name});

Solution 3:

Yes it does. This simple solution has worked for me everytime:

db.Query<Remitente>("SELECT * 
                     FROM Remitentes 
                     WHERE Nombre LIKE @n", new { n = "%" + nombre + "%" })
                   .ToList();