Question

数据库：

  db.execSQL("CREATE TABLE " + TABLE_NAME_NOTE + " ("
                + BaseColumns._ID + " INTEGER PRIMARY KEY,"
                + NoteColumns.TITLE + " NVARCHAR(200),"
                + NoteColumns.NOTE + " TEXT,"
                + NoteColumns.CREATED_DATE + " INTEGER,"
                + NoteColumns.MODIFIED_DATE + " INTEGER,"
                + NoteColumns.TYPE + " INTEGER,"
                + NoteColumns.NEED_NOTICE + " INTEGER,"
                + NoteColumns.NOTICE_WAY + " INTEGER,"
                + NoteColumns.NOTICE_TIME + " INTEGER"
                + ");");

这是我的疑问：

Cursor cursor = mContext.managedQuery(mContext.getIntent().getData(), 
            NoteEntry.PROJECTION_NOTE,
            null, null, NoteColumns.DEFAULT_SORT_ORDER);

当NoteEntry.PROJECTION_NOTE

时，代码正常工作

public static final String[] PROJECTION_NOTE = new String[] {
    BaseColumns._ID, // 0
    NoteColumns.TITLE, // 1
    NoteColumns.NOTE };

但是当我设置此

时，我得到“无效的列类型”异常

public static final String[] PROJECTION_NOTE = new String[] {
    BaseColumns._ID, // 0
    NoteColumns.TITLE, // 1
    NoteColumns.NOTE,
    NoteColumns.CREATED_DATE,
    NoteColumns.MODIFIED_DATE,
    NoteColumns.TYPE,
    NoteColumns.NEED_NOTICE,
    NoteColumns.NOTICE_WAY,
    NoteColumns.NOTICE_TIME
};

太困惑了。
另一个问题，我应该使用INTEGER类型将Date数据存储为Created_Date字段，sdk中的代码示例。我是sqlite和android的新手请帮帮我。谢谢。

Answer 1

将日期也设为 TEXT 类型而不是 INTEGER 类型，因为日期可能包含一些特殊字符。

Answer 2

“Type”是列名并发现这种方式解决问题，仍然不明白：

public static final String[] PROJECTION_NOTE = new String[] {
        BaseColumns._ID, // 0
        NoteColumns.TITLE, // 1
        NoteColumns.NOTE,
        NoteColumns.CREATED_DATE,
        NoteColumns.MODIFIED_DATE,
        NoteColumns.TYPE + " as " + NoteColumns.TYPE,
        NoteColumns.NEED_NOTICE + " as " + NoteColumns.NEED_NOTICE,
        NoteColumns.NOTICE_WAY + " as " + NoteColumns.NOTICE_WAY,
        NoteColumns.NOTICE_TIME + " as " + NoteColumns.NOTICE_TIME,
    };

Sqlite查询错误：列类型无效

2 个答案: