what is the problem mysql reader problem ı dont understand?

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MySqlConnection conn = new MySqlConnection(baglan.connStr);
conn.Open();
sqlll = "select * from `mbs`.`kimlik` where id= '" + idd + "' and name='" + Adii + "' and surname='" + soyadii + "' and father_name='" + babaadii + "' and birth_day=" + dogum_tarih + "";
MySqlCommand cmd = new MySqlCommand(sqlll, conn);
MySqlDataReader rdr = cmd.ExecuteReader();
while(rdr.Read())
{
xxxxx
}

everything is ok.sqlll query is work there is no problem sqlll

but program not get in while (rdr.read()){}
it is going to rdr.close
cmd.close line

ı dont understand

Posted 12-Feb-12 7:20am

Member-2338430

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E.F. Nijboer 12-Feb-12 13:37pm

Do you get any results if you take the value of sqlll and execute it directly in MySQL Workbench (or whatever you use)?

Member-2338430 12-Feb-12 13:52pm

ok ı found error but still ı dont understand mysql column type utf8 turkish ci
surname capital father name capital I changed lower case it is run but why this kind of error gives me ı dont understand

Member-2338430 12-Feb-12 13:53pm

I will change all data lower case?

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-02-12T07:55:00

If so, it simply means that the result of your query is empty.

Now, an important note for you: You are compose your query using string concatenation. This is bad. 1) first, repeated string concatenation is ineffective because string is immutable; 2) more importantly, this method of making a query is considered to be vulnerable to SQL injection; you should use parametrized query instead.

See also:

http://en.wikipedia.org/wiki/SQL_injection[^],
http://msdn.microsoft.com/en-us/library/ms254953.aspx[^];

http://stackoverflow.com/questions/652978/parameterized-query-for-mysql-with-c-sharp[^],
http://www.dailycoding.com/Posts/addparameterizedqueriesinmysqloledb.aspx[^].

—SA