Java选择带参数的查询字符串

Question

This is the query

 String query = 
 "SELECT idPlayers 
 FROM pendu.players 
 WHERE first= 'Super'AND last='Man' AND pass=12345";

I want to change (first='Super') to the first = tboxFirst.getText() etc

Thanks for helping me

Frank

Answer 1

If you are using a string you can just create the string with the value in it like this:

 String query = "SELECT idPlayers FROM pendu.players WHERE first= '" + tboxFirst.getText() + "'AND last='Man' AND pass=12345";

You should also take a look at PreparedStatement as that's a much better solution.

Answer 2

  PreparedStatement pstmt = con.prepareStatement(
  "SELECT idPlayers FROM pendu.players WHERE 
       first= ? AND last= ? AND pass=?");

   pstmt.setString(1, tboxFirst.getText());
   pstmt.setString(2, ....);
   ....

Answer 3

字符串查询=“从pendu.players中选择idPlayers，其中first =（'” + tboxFirst.getText（）+“'）AND pass = 12345”;

Answer 4

You can use either
String query = "SELECT idPlayers FROM pendu.players WHERE first='"+tboxFirst.getText()+"'AND last='Man' AND pass=12345";

or

String query = String.format(SELECT idPlayers FROM pendu.players WHERE first='%s'AND last='Man' AND pass=12345", tboxFirst.getText());

And if you are using JDBC, you can use PreparedStatement
PreparedStatement pstmt = con.prepareStatement("SELECT idPlayers FROM pendu.players WHERE first=? AND last=? AND pass=?");
pstmt.setString(1, "Super");
pstmt.setString(2, "Man");
pstmt.setString(3, "12345");