Question

我正在制作一个需要在登录页面输入用户名和密码的应用程序。如何从黑莓10级联数据库中检索用户名和密码？请提一下代码......

Answer 1

通过结果集从数据库中获取require用户和密码。

String user=usertx.getText();
char[] password=pswdtx.getPassword();
String pswd=String.valueOf(password);   \\here is important to put a char password in string.`

我们通过以下方式调用require用户及其密码：

Resultset rs= stmt.excuteQuery("SELECT * FROM USERS WHERE NAME='"+user+"' AND PASSWORD='"+pswd+"'");

此代码将仅获取所选用户的行和他在行上的信息，并将其设置为（rs）。代码rs.next()：

while(rs.next()){
    rsuser=rs.getString("NAME");         //get user and set it in rsuser.
    rspswd=rs.getString("PASSWORD");}    //get password and set it in rspswd.
if ((user.equals(rsuser)) && (pswd.equals(rspswd))){  //the equevlant statment.
    JOptionPane.showMessageDialog(null, "Username and Password exist");}
else {
    JOptionPane.showMessageDialog(null, "Please Check Username and Password ");}
}

这里是完整的代码：

private void submitActionPerformed(java.awt.event.ActionEvent evt) {                                       
    try {
        String user=usertx.getText();
        char[] password=pswdtx.getPassword();
        String pswd=String.valueOf(password);

        String rsuser=null;
        String rspswd=null;
        String Q="SELECT * FROM USERS WHERE NAME='"+user+"' AND PASSWORD='"+pswd+"'";
        rs=stmt.executeQuery(Q);

        while(rs.next()){
        rsuser=rs.getString("NAME");
        rspswd=rs.getString("PASSWORD");}
        if ((user.equals(rsuser)) && (pswd.equals(rspswd))){
        JOptionPane.showMessageDialog(null, "Username and Password exist");}
        else {
            JOptionPane.showMessageDialog(null, "Please Check Username and Password ");}
        } 
    catch (SQLException ex) {ex.printStackTrace();}
}

Answer 2

将以下行添加到.pro文件中 LIBS + = -lbbdata

然后你可以编写以下代码：

    QVariant searchResult;
    QVariantList searchList;
    QString userName, password;

    bb::data::SqlDataAccess sda(QDir::currentPath() + "/app/native/assets/sample.sqlite");

    searchResult = sda.execute("select * from usersTable where userId=5");
    searchList = searchResult.value<QVariantList>();

    userName = searchList.at(0).toMap()["name"];
    password = searchList.at(0).toMap()["password"];

从数据库中检索用户名和密码

2 个答案: