I am having c# code like this:
using (MySqlConnection con = new MySqlConnection(AR.ConnectionString))
{
con.Open();
using (MySqlCommand cmd = new MySqlCommand(@"SELECT PORUDZBINAID, USERID, BRDOKKOM, DATUM,
STATUS, MAGACINID, PPID, INTERNIKOMENTAR, REFERENT_OBRADE, NACIN_PLACANJA, TAG FROM
PORUDZBINA WHERE TAG LIKE '%@MOB%'", con))
{
cmd.Parameters.AddWithValue("@MOB", Mobilni);
MySqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
list.Add(new Porudzbina()
{
PorudzbinaID = Convert.ToInt32(dr[0]),
UserID = Convert.ToInt32(dr[1]),
BrDokKom = Convert.ToInt32(dr[2]),
Datum = Convert.ToDateTime(dr[3]),
Status = (PorudzbinaStatus)Convert.ToInt32(dr[4]),
MagacinID = Convert.ToInt32(dr[5]),
PPID = (dr[6] is DBNull) ? (int?)null : Convert.ToInt32(dr[6]),
InterniKomentar = (dr[7] is DBNull) ? null : dr[7].ToString(),
ReferentObrade = (dr[8] is DBNull) ? (int?)null : Convert.ToInt32(dr[8]),
NacinUplate = (PorudzbinaNacinUplate)Convert.ToInt32(dr[9]),
Tag = JsonConvert.DeserializeObject<Properties>(dr["TAG"].ToString())
});
}
}
I put breakpoint and it passes good paramter to query but doesn't enter while() loop (so i is not reading) and it returns no rows.
When i enter same query in my mysql and replace @MOB with parameter passed there, it does return me one row.
I guess problem is something with passing LIKE through c# but not sure why it does that.
You need to change how you are adding parameters slightly:
In your SQL, no quotes and no % symbols.
using (MySqlCommand cmd = new MySqlCommand(@"SELECT PORUDZBINAID, USERID, BRDOKKOM, DATUM,
STATUS, MAGACINID, PPID, INTERNIKOMENTAR, REFERENT_OBRADE, NACIN_PLACANJA, TAG FROM
PORUDZBINA WHERE TAG LIKE @MOB", con))
{
Then the parameter like this, without quotes.
cmd.Parameters.AddWithValue("@MOB", "%" + Mobilni + "%");
BTW: Ideally you should not use AddWithValue, but rather Add(). See this blog: https://blogs.msmvps.com/jcoehoorn/blog/2014/05/12/can-we-stop-using-addwithvalue-already/
And this SO post: MySqlCommand Command.Parameters.Add is obsolete
Instead, it should be like this:
cmd.Parameters.Add("@MOB", SqlDbType.Varchar).Value = "%" + Mobilni + "%";
//you must update to use the correct DBType for your data
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