爲什麼我得到錯誤語法錯誤？

Question

Class.forName("com.mysql.jdbc.Driver"); 
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/hibernate","root","root"); 
String query1= "select * from registration where email= ? and password= ? "; 
PreparedStatement ps = con.prepareStatement(query1); 
ps.setString(1,email); 
ps.setString(2,password); 
ResultSet rs1= ps.executeQuery(query1); 
rs1.next(); 
String s= rs1.getString("type"); 
out.println(s); 

我收到以下錯誤 -

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your 
    SQL syntax; check the manual that corresponds to your MySQL server version for the 
    right syntax to use near '? and password= ?' at line 1 

Answer 1

ps.executeQuery(query1) 

必須改變，以

ps.executeQuery() 

否則，你不執行與綁定參數準備好的查詢，但沒有準備好查詢，沒有任何參數綁定。