Question

我正在创建一个todo任务应用程序，我使用SQLite数据库，当我向数据库添加一个新项目时，应用程序始终打破我不知道这是什么类型的错误。任务类：

public class Task {
    String name;
    String discrb;
    int day , month , year ,donecheck ,periocheck;
    public Task()
    {
        donecheck =0;   
    }
}

SQLite代码：

public class TodoDb extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "todolistdb";
    private static final String TABLE_TASKS = "tasks";
    private static final String KEY_NAME="Task_Name";
    private static final String KEY_DESC ="Description";
    private static final String KEY_DAY="Day";
    private static final String KEY_MON="Month";
    private static final String KEY_YEAR="Year";
    private static final String KEY_DONE="Done";
    private static final String KEY_PRI="Priority";

    public TodoDb(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        String create_table= "Create Table" + TABLE_TASKS + " (" + KEY_NAME +" TEXT PRIMARY KEY ," +
        KEY_DESC +" TEXT , " +KEY_DAY +" INTEGER , "+KEY_MON +" INTEGER , "+KEY_YEAR +" INTEGER , "+
        KEY_DONE +" INTEGER , "+KEY_PRI +" INTEGER "+ " ) ";
        db.execSQL(create_table);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_TASKS);
        onCreate(db); 
    }

    // The add task function
    public void addTask(Task task)
    {
        SQLiteDatabase db=this.getWritableDatabase();
        ContentValues values=new ContentValues();
        values.put(KEY_NAME, task.name);
        values.put(KEY_DESC, task.discrb);
        values.put(KEY_DAY, task.day);
        values.put(KEY_MON, task.month);
        values.put(KEY_YEAR, task.year);
        values.put(KEY_DONE, task.donecheck);
        values.put(KEY_PRI, task.periocheck);
        db.insert(TABLE_TASKS,null, values);
        db.close();
    }
}

那么代码中的错误是什么

Answer 1

打印时

String create_table= "Create Table" + TABLE_TASKS + " (" + KEY_NAME +" TEXT PRIMARY KEY ," +
        KEY_DESC +" TEXT , " +KEY_DAY +" INTEGER , "+KEY_MON +" INTEGER , "+KEY_YEAR +" INTEGER , "+
        KEY_DONE +" INTEGER , "+KEY_PRI +" INTEGER "+ " ) ";

Table之后没有空格，因此创建表语法错误，给出这样的空格

String create_table= "Create Table " + TABLE_TASKS + " (" + KEY_NAME +" TEXT PRIMARY KEY ," +
            KEY_DESC +" TEXT , " +KEY_DAY +" INTEGER , "+KEY_MON +" INTEGER , "+KEY_YEAR +" INTEGER , "+
            KEY_DONE +" INTEGER , "+KEY_PRI +" INTEGER "+ " ) ";

为什么在我向SQLite数据库添加项目时应用程序会中断

1 个答案: