Sql select query using like

Question

I am trying to run this code

 public long getTopicCountWithTag(String tag)
    {
        long count;
        query = " SELECT count(*) FROM [DB_us2].[dbo].[discns] where tags like '%@tags%'";
        try
        {
            com = new SqlCommand(query, con);
            com.Parameters.AddWithValue("@tags", tag);
            con.Open();          
            sdr = com.ExecuteReader();
            sdr.Read();
            count= sdr.GetInt32(0);

        }
        catch (Exception e)
        {
            count = -1;
            throw e;
        }
        finally
        {
            con.Close();
        }
        return count;
    }

its giving output 0 . So i try figure out what is the problem and run sample query on management studio but output is different its giving 1. After trying all permutation combination, i think problem is with this statement com.Parameters.AddWithValue("@tags", tag); might be possible @tags is not replaced in query.

Answer 1

I think your query should be

string query = "SELECT count(*) FROM [DB_us2].[dbo].[discns] where tags like @tags";

And add the wildcard to the parameter

com.Parameters.AddWithValue("@tags", "%" + tag + "%");