Question

如何使用android studio sqlite中其他表中的列创建视图？

Answer 1

public class DBHelper extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "user_detail.db";




    public DBHelper(Context context) {
        super(context,DATABASE_NAME,null,1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + UserProfile.User.TABLE_NAME + "("+UserProfile.User.col_1+" Integer primary key autoincrement," +
                "" +UserProfile.User.col_2 + " text," +
                ""+UserProfile.User.col_3+ " text," +
                ""+UserProfile.User.col_4+ " text," +
                ""+UserProfile.User.col_5+ " text )");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion) {
        db.execSQL(("drop table if exists " + UserProfile.User.TABLE_NAME));
        onCreate(db);
    }
    public boolean addInfo(String userName,String password){
        SQLiteDatabase db= this.getWritableDatabase();
        ContentValues con=new ContentValues();
        //con.put(col_1,ID);
        con.put(UserProfile.User.col_2,userName);
        con.put(UserProfile.User.col_5,password);
        //con.put(col_3,dateOfBirth);
        //con.put(col_4,Gender);

        long result=db.insert(UserProfile.User.TABLE_NAME,null,con);
        db.close();
        if(result==-1){
            return false;
        }else{
            return true;
        }
    }
    public boolean updateInfor(String username,String dateOfBirth,String gender, String password){


        SQLiteDatabase db=this.getWritableDatabase();
        ContentValues con= new ContentValues();
        //con.put(UserProfile.User.col_1,userId);
        con.put(UserProfile.User.col_2,username);
        con.put(UserProfile.User.col_3,dateOfBirth);
        con.put(UserProfile.User.col_5,password);
        con.put(UserProfile.User.col_4,gender);

        db.update(UserProfile.User.TABLE_NAME,con,UserProfile.User.col_2+"=?",new String[]{String.valueOf(username)});
       // db.close();



        return true;


    }
    public Integer DeleteInfor(String userName){
        SQLiteDatabase db=this.getReadableDatabase();


        return db.delete(UserProfile.User.TABLE_NAME,UserProfile.User.col_2+"=?",new String[]{userName});

    }
    public Cursor getData(){
        SQLiteDatabase db= this.getWritableDatabase();
        Cursor res=db .rawQuery(("select * from "+UserProfile.User.TABLE_NAME ),null);
        return  res;
    }
    public List<User> getAllUser(String users){
        String[] columns={
                UserProfile.User.col_1,
                UserProfile.User.col_2,
                UserProfile.User.col_3,
                UserProfile.User.col_4,
                UserProfile.User.col_5,
        };
        String sortOrder=UserProfile.User.col_1 +"ASC";

        List<User>userList = new ArrayList <User>();
        SQLiteDatabase db= this.getReadableDatabase();

        Cursor cursor = db.query(UserProfile.User.TABLE_NAME,
                columns,
                null,
                null,
                null,
                null,
                sortOrder);

        if(cursor.moveToFirst()){
            do{
                User user= new User();
                user.setUserId(cursor.getString(cursor.getColumnIndex(UserProfile.User.col_1)));
                user.setUserName(cursor.getString(cursor.getColumnIndex(UserProfile.User.col_2)));
                user.setDateOfBirth(cursor.getString(cursor.getColumnIndex(UserProfile.User.col_3)));
                user.setGender(cursor.getString(cursor.getColumnIndex(UserProfile.User.col_4)));
                user.setPassword((cursor.getString(cursor.getColumnIndex(UserProfile.User.col_5))));
                userList.add(user);
            }while (cursor.moveToNext());
        }
        cursor.close();
        db.close();

        return userList;
    }
    public boolean checkUser(String username){
        String[] columns={UserProfile.User.col_1};

        SQLiteDatabase db=this.getReadableDatabase();
         String selection  = UserProfile.User.col_2+"=?";

         String [] selectionArgs={username};

         Cursor cursor=db.query(UserProfile.User.TABLE_NAME,
                 columns,
                 selection,
                 selectionArgs,
                 null,
                 null,
                 null);
         int cursorCount=cursor.getCount();
         cursor.close();
         db.close();

         if(cursorCount>0){
             return true;
         }

        return false;
    }
    public boolean checkUsers(String username,String password) {
        String[] columns={UserProfile.User.col_1};

        SQLiteDatabase db=this.getReadableDatabase();
        String selection  = UserProfile.User.col_2+"=? and "+UserProfile.User.col_5 +"=?";

        String [] selectionArgs={username,password};

        Cursor cursor=db.query(UserProfile.User.TABLE_NAME,
                columns,
                selection,
                selectionArgs,
                null,
                null,
                null);
        int cursorCount=cursor.getCount();
        cursor.close();
        db.close();

        if(cursorCount>0){
            return true;
        }

        return false;
    }

Answer 2

~/mydir/a.bat
~/mydir/a.sh
~/mydir/a-lib/a-1.0.0.jar
~/mydir/a-lib/a-dep1-1.2.3.jar
~/mydir/a-lib/a-dep2-4.5.6.jar
~/mydir/b.bat
~/mydir/b.sh
~/mydir/b-lib/b-1.0.0.jar

Answer 3

使用SQLite Database Helper类

public class SQLiteHandler extends SQLiteOpenHelper {

private static final String TAG = SQLiteHandler.class.getSimpleName();

private static final int DATABASE_VERSION = 1;

// Database Name
private static final String DATABASE_NAME = "android_api";

// Login table name
private static final String TABLE_USER = "user";

// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_EMAIL = "email";
private static final String KEY_UID = "uid";
private static final String KEY_CREATED_AT = "created_at";

public SQLiteHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_USER + "("
            + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
            + KEY_EMAIL + " TEXT UNIQUE," + KEY_UID + " TEXT,"
            + KEY_CREATED_AT + " TEXT" + ")";
    db.execSQL(CREATE_LOGIN_TABLE);

    Log.d(TAG, "Database tables created");
}

// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Drop older table if existed
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER);

    // Create tables again
    onCreate(db);
}

}

在android studio中使用sqlite。我该如何创建视图？

3 个答案: