错误“; 预期”，sql语句

Question

String l="UPDATE counselor SET firstName="qwe" WHERE id=1";

Could anyone tell me what's wrong with above statement,as q sql statement. Netbeans displays as "; expected". I can't understand why it isn't correct at least as a string. Code is as follows.

String l="UPDATE counselor SET firstName="qwe" WHERE id=1";
Statement m=conn.createStatement();
ResultSet v=m.executeQuery(l);

Answer 1

In SQL, you should escape strings with ' . So,

String l="UPDATE counselor SET firstName='qwe' WHERE id=1";

Answer 2

String l="UPDATE counselor SET firstName=\"qwe\" WHERE id=1";

If you want to put quotes within quotes you must use the escape sequence, \\", on the interior quotes. To print the sentence. For example

She said "Hello!" to me.

you would write

System.out.println("She said \"Hello!\" to me.");