[英]how to import a txt file into a JTable and make the first column auto increment according to the number of lines of the file
[英]Auto increment field not display in JTable first show
我数据库中的表有5个字段。 第一个字段(ID)是自动递增。
这是我添加新用户的表格: (由于是自动递增,因此未请求ID字段)
现在,当我添加新用户时,首先显示时, ID
字段不显示!
刷新后,显示ID :(数字24)
这是我的代码:
public class UserPage extends JFrame implements ActionListener {
...
public void addAction() {
AddUserDialog UserDialog = new AddUserDialog(this);
Object[] myRow = new Object[]{UserDialog.getfName(), UserDialog.getlName(), UserDialog.getGender(), UserDialog.getDate()}; // how get ID here?
if (addQuery(UserDialog.getfName(), UserDialog.getlName(), UserDialog.getGender(), UserDialog.getDate())) {
model.addRow(myRow);
}
}
public boolean addQuery(String fname, String lname, String gender, String date) {
try {
Connection con;
Statement statement;
String query = "insert into UserTable(FirstName,LastName,Gender,Date) " +
"values ( '" + fname + "' , '" + lname + "' , '" + gender + "', '" + date + "' ) ";
con = DriverManager.getConnection(...);
statement = con.createStatement();
if (statement.execute(query)) {
return true;
}
} catch (SQLException sqle) {
sqle.printStackTrace();
return false;
}
return true;
}
}
第一次显示时如何获得ID显示? 谢谢!
这个:
public String addQuery2(String fname, String lname, String gender, String date) throws Exception {
String getMe = null;
ResultSet res = null;
try {
Connection con;
PreparedStatement pStatement;
String query = "insert into UserTable(FirstName,LastName,Gender,Date) " +
"values ( '" + fname + "' , '" + lname + "' , '" + gender + "', '" + date + "' ) ";
con = DriverManager.getConnection(...);
pStatement = con.prepareStatement(query, Statement.RETURN_GENERATED_KEYS);
pStatement.execute(query)
res = pStatement.getGeneratedKeys();
getMe = String.valueOf(res.getInt(1));
} catch (SQLException sqle) {
sqle.printStackTrace();
}
return getMe;
}
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