我正在执行一种方法，该方法应该更新我在本地数据库中具有的标签（卡）的位置，此方法（UpdateWallet）接受用户的输入并根据用户插入的内容覆盖数据库中的记录。在此方法代码的末尾，如果在数据库中找到了输入的“标签”并成功更新了其位置，则它应返回true并输出一条消息，说明更新已成功。否则，返回false，但是我有2个问题：

1-虽然我收到上一条消息（它已成功更新），但值没有更新。

2-无论我输入什么值，我的方法都很满意，并声称它“更新”了记录。即使插入的标签在我的数据库中不存在！在这种情况下，它应该只返回false。

我的更新方法：

public boolean UpdateWallet(wallet upWallet) throws SQLException {
    Connection dbConnection = null;
    Statement statement = null;

    String update = " UPDATE wallets  SET Location  = '"+upWallet.getWalletLocation()+"'  WHERE Tag = '"
    + upWallet.getWalletTag()+"';";

    try {
        dbConnection = getDBConnection();
        statement = dbConnection.createStatement();
        // execute SQL update
        statement.executeUpdate(update);
        System.out.println("It has been updated successfully");

    } catch (SQLException e) {

        System.out.println(e.getMessage());
        return false;

    } finally {

        if (statement != null) {
            statement.close();
        }
        if (dbConnection != null) {
            dbConnection.close();
        }
    }
    return true;
}

控制器代码：

System.out.println("Please enter a tag to update its location");
String tag = input.next();

System.out.println("Please enter Location ");
String loc = input.next();

wallet w = new wallet(tag,loc); 
WalletsDAO.UpdateWallet(w);

钱包类：

public class wallet {
    private String Name;
    private String Location;
    private String Tag;

    public wallet(String Name,String Location,String Tag) {
        this.Name = Name;
        this.Location = Location;
        this.Tag = Tag;
    }

    public wallet(String Tag) {
        this.Tag = Tag;

    }

    public wallet(String Location,String Tag) {
        this.Name = Name;
        this.Location = Location;
        this.Tag = Tag;
    }

    public String getWalletName() {
        return Name;
    }

    public void setWalletName(String Name) {
        this.Name = Name;
    }

    public String getWalletLocation() {
        return Location;
    }

    public void setWalletLocation(String Location) {
        this.Location = Location;
    }

    public String getWalletTag() {
        return Tag;
    }

    public void setWalletTag(String Tag) {
        this.Tag = Tag;
    }

    @Override
    public String toString() {
        String p = (this.Name + ',' + this.Location + ',' + this.Tag);

        return p;
    }
}

有人可以帮我吗？