Java的选择查询字符串参数

Question

这是查询

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

我想改变（第一=“超级”）到第一= tboxFirst.getText（）等

谢谢你帮我

弗兰克

Answer 1

如果你使用一个字符串你可以创建这样有什么意义的字符串：

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

您还应该看看PreparedStatement，因为这是一个更好的解决方案。

Answer 2

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

Answer 3

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

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

Answer 4

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

或

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

如果你正在使用JDBC，你可以使用PreparedStatement的
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");