Question

在我的应用程序中，用户登录。首先，我在邮件地址上验证用户。

protected Boolean doAuthenticateWithEmail(final String mEmail, String mPassword)

在onTuthenticated的回调方法中，用户使用以下POJO存储在Firebase数据库中：

public class User {

private String emailAddress;
private String profitNumber;
private String userName;

public User() {
    //Default constructor used by Firebase
}

public User(String emailAddress, String profitNumber, String userName) {
    this.emailAddress = emailAddress;
    this.profitNumber = profitNumber;
    this.userName = userName;
}

public String getEmailAddress() {
    return emailAddress;
}

public String getProfitNumber() {
    return profitNumber;
}

public String getUserName() {
    return userName;
}}

这是将userobject存储在代表邮件地址的节点下的代码。

Firebase userRef = new Firebase(Constants.FIREBASE_URL_USERS);
userRef.setValue(user.getEmailAddress().replace(".",","));
Firebase mailRef = userRef.child(user.getEmailAddress().replace(".",","));
mailRef.setValue(user);

我的问题是：如果此用户已存在，最佳做法是什么？我应该首先检查数据是否存在，或者只是覆盖现有数据。

Answer 1

事实证明需要进行检查。

     /**
     * Encode user email replacing "." with "," to be able to use it
     * as a Firebase db key
     */
    String mEncodedEmail = mEmail.replace(".", ",");

    /* If the user doesn't exists, make a user */
    final Firebase userLocation = new Firebase(Constants.FIREBASE_URL_USERS).child(mEncodedEmail);
    userLocation.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
                /* If nothing is there ...*/
            if (dataSnapshot.getValue() == null) {

                userLocation.setValue(user);
            }
        }

将现有POJO对象存储在Firebase数据库中的最佳做法

1 个答案: