SQLite的 - 如何解決語法錯誤（代碼1）

Question

裏面我Input.java文件我有

public class Input { 

    private int _id; 
    private String _username; 

    public Input(){ 

    } 

    public Input(String username){ 
     this._username = username; 
    } 

    public void set_id(int _id) { 
     this._id = _id; 
    } 

    public void set_username(String _username) { 
     this._username = _username; 
    } 

    public int get_id() { 
     return _id; 
    } 

    public String get_username() { 
     return _username; 
    } 
} 

和我DBHandler.java內

public class DBHandler extends SQLiteOpenHelper { 

    private static final int DATABASE_VERSION = 1; 
    private static final String DATABASE_NAME = "input.db"; 
    public static final String TABLE_INPUT = "input"; 
    public static final String COLUMN_ID = "_id"; 
    public static final String COLUMN_USERNAME = "username"; 

public DBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) { 
     super(context, DATABASE_NAME, factory, DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    String query = "CREATE TABLE " + TABLE_INPUT + "(" + 
      COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT " + 
      COLUMN_USERNAME + " TEXT " + 
      ");"; 
    db.execSQL(query); 
} 

每當我試着執行此，我得到錯誤：

Caused by: android.database.sqlite.SQLiteException: near "username": syntax error (code 1): , while compiling: CREATE TABLE input(_id INTEGER PRIMARY KEY AUTOINCREMENT username TEXT); 

我究竟在做什麼錯？

Answer 1

您的用戶名之前缺少一個逗號：

" INTEGER PRIMARY KEY AUTOINCREMENT<missing comma here> " 

更正如下代碼：

String query = "CREATE TABLE " + TABLE_INPUT + "(" + 
      COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      COLUMN_USERNAME + " TEXT " + 
      ");";