如何从输入到JTextField的数据中生成sql insert string

Question

我有一些问题让插入字符串工作它给我一个语法错误，但无法弄清楚为什么，任何帮助？

String sql = "INSERT INTO user VALUES ('"+ jtfEmailAddr.getText()+"'," + 
             "'"+ jtfPassword2.getText() + "'," + 
             "'"+ jtfFName.getText() +"','" + jtfSurname.getText() +"')" +
             "ON DUPLICATE KEY UPDATE password='" + jtfPassword2.getText() + "'"+ `enter code here`
             "firstname='" + jtfFName.getText() + "'," +
             "lastname='" + jtfSurname.getText() + "'";
database.insertIntoDatabase(sql);

ERROR：

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 'rr'nn)' at line 1

字母rr nn对于测试目的而言只是随机的

Answer 1

尝试在那里添加逗号''，“ 没有更多的信息是我看错的部分 （当然除了“在这里输入代码”......）