我如何在C＃中使用like语句

Question

i am adding parameter by

qry = qry.Replace("{criteria}", "info.abc LIKE '%?val%'");

command not worked if i removed ' ' from the command then it give a error how i can search the table in c#

Answer 1

As per the syntax of TSQL - Like you require to put search value between ' '

Example :

WHERE title LIKE '%computer%'

syntax

match_expression [ NOT ] LIKE pattern [ ESCAPE escape_character ]

Answer 2

Another way to do this which is more explicit - and in my opinion more readable because it avoids the crockety parts of the SQL syntax:

SqlDataReader r = new SqlCommand("SELECT * FROM the_table").ExecuteReader();
object[] values = new object[5000];
r.GetValues(values);
foreach (string value in values)
    if (value.Length > 4)
        if (value.Contains("val"))
            new SqlCommand("UPDATE the_table SET value = 'newValue' WHERE "+
                           "value = '"+value+"'").ExecuteNonQuery();