java - 获取特定行的 SQLite android
问题描述
我是 Android 新手,当用户通过电子邮件和密码登录时我想要它。通过电子邮件将其余信息(例如名字和出生日期)提供给用户。有没有办法做到这一点?
“有没有我可以添加的功能,通过电子邮件登录后无法带入所有用户信息”
这是我的数据库代码:
public class DatabaseHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "UserManager.db";
private static final String TABLE_USER = "user";
private static final String COLUMN_USER_ID = "user_id";
private static final String COLUMN_USER_FIRST_NAME = "user_first_name";
private static final String COLUMN_USER_LAST_NAME = "user_last_name";
private static final String COLUMN_USER_EMAIL = "user_email";
private static final String COLUMN_USER_PHONE_NUMBER = "user_phone_number";
private static final String COLUMN_USER_BARTH_DAY = "user_barth_day";
private static final String COLUMN_USER_PASSWORD = "user_password";
private static final String COLUMN_USER_GENDER = "user_gender";
private String CREATE_USER_TABLE = "CREATE TABLE "+TABLE_USER + "("+
COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"+
COLUMN_USER_FIRST_NAME + " TEXT,"+ COLUMN_USER_LAST_NAME + " TEXT,"+
COLUMN_USER_EMAIL + " TEXT PRIMARY KEY,"+COLUMN_USER_PHONE_NUMBER + " TEXT,"+
COLUMN_USER_BARTH_DAY+" TEXT,"+ COLUMN_USER_PASSWORD+" TEXT," +
COLUMN_USER_GENDER+" TEXT"+ ")";
private String DROP_USER_TABLE = "DROP TABLE IF EXISTS "+ TABLE_USER ;
public DatabaseHelper(Context context) {
super(context , DATABASE_NAME, null , DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_USER_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(DROP_USER_TABLE);
onCreate(db);
}
public void addUser(User user){
SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_USER_FIRST_NAME , user.getFirstName());
values.put(COLUMN_USER_LAST_NAME , user.getLastName());
values.put(COLUMN_USER_EMAIL , user.getEmail());
values.put(COLUMN_USER_PHONE_NUMBER , user.getPhoneNumber());
values.put(COLUMN_USER_BARTH_DAY , user.getBarthDay());
values.put(COLUMN_USER_PASSWORD , user.getPassword());
values.put(COLUMN_USER_GENDER , user.getGender());
database.insert(TABLE_USER , null, values);
database.close();
}
public boolean checkUser (String email){
String [] columns = {
COLUMN_USER_ID
};
SQLiteDatabase database = this.getWritableDatabase();
String selection = COLUMN_USER_EMAIL + " = ?";
String[] selectionArgs = {email};
Cursor cursor = database.query(TABLE_USER,
columns,selection , selectionArgs,null,null,null);
int cursorCount = cursor.getCount();
cursor.close();
database.close();
if (cursorCount > 0){
return true;
}else {
return false;
}
}
public boolean checkUser (String email , String password){
String [] columns = {
COLUMN_USER_ID
};
SQLiteDatabase database = this.getWritableDatabase();
String selection = COLUMN_USER_EMAIL + " = ?" + " AND " + COLUMN_USER_PASSWORD + " = ?";
String[] selectionArgs = {email , password};
Cursor cursor = database.query(TABLE_USER,
columns,selection , selectionArgs,null,null,null);
int cursorCount = cursor.getCount();
cursor.close();
database.close();
if (cursorCount > 0){
return true;
}else {
return false;
}
}
}
解决方案
对于您的第一个问题,您可以添加以下功能并使用它。
public User getSingleUserInfo(String email){
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery("SELECT * FROM " + TABLE_USER + " WHERE " + COLUMN_USER_EMAIL + "=" + email);
cursor.moveToFirst();
//setting related user info in User Object
User user = new User();
user.setUserId(cursor.getInt(cursor.getColumnIndexCOLUMN_USER_ID ));
user.setFirstName(cursor.getString(cursor.getColumnIndex(COLUMN_USER_FIRST_NAME));
user.setLastName(cursor.getString(cursor.getColumnIndex(COLUMN_USER_LAST_NAME ));
user.setEmail(cursor.getString(cursor.getColumnIndex(COLUMN_USER_EMAIL ));
user.setPhoneNumber(cursor.getString(cursor.getColumnIndex(COLUMN_USER_PHONE_NUMBER ));
user.setBirthday(cursor.getString(cursor.getColumnIndex(COLUMN_USER_BARTH_DAY ));
user.setPassword(cursor.getString(cursor.getColumnIndex(COLUMN_USER_PASSWORD));
user.setGender(cursor.getString(cursor.getColumnIndex(COLUMN_USER_GENDER ));
//close cursor & database
cursor.close();
database.close();
return user;
}
注意:请注意您的
User
对象setter
功能,这些功能可能与我的示例和数据类型不同。使用c.getInt()
ifint
和c.getString()
ifString
。
推荐阅读
- git - 配置 git 以使用 flyway 对具有不同名称模式的文件进行提交差异
- javascript - 有什么方法可以将 urn:ietf:wg:oauth:2.0:oob 与 ADAL JS 一起使用
- python - 删除 Xarray 子图中的共享颜色条
- google-sheets - 在空格处拆分,后跟字符
- c++ - 重写一个基本程序,以便它使用参数和参数代替全局变量
- python - Canny边缘检测后如何填补字母中的空白
- ruby-on-rails - 执行后如何继续将作业添加到后台队列?
- javascript - 日期排序和反转
- asp.net-core - ASP.NET Core 应用程序作为 Windows 服务 CI/CD 管道
- javascript - 使用 XSS 在服务器端更改已经存在的 javascript 文件