SQLite 和游標

Question

我的問題是我無法使用 Cursor 從數據庫中檢索數據，並且在所有情況下都會拋出 SQLite 異常

db.execSQL("CREATE TABLE BOOKS ("
     + "_ID INTEGER PRIMARY KEY AUTOINCREMENT, "
     + "Name TEXT, "
     + "Sub_Field TEXT, "
     + "Cover INTEGER, "
     + "Priority INTEGER);");

ContentValues BookValue = new ContentValues();

BookValue.put("Name", "Cisco");
BookValue.put("Sub_Field", "Net");
BookValue.put("Cover", R.drawable.cappuccino );
BookValue.put("Priority", 1);

db.insert("BOOKS", null, BookValue);

主要活動：

try {
  SQLiteOpenHelper myDatabase = new myDatabase(this);
  db = myDatabase.getWritableDatabase();
  myText = (TextView) findViewById(R.id.txt);

  cursor = db.query("BOOK", new String[] {"Name", "Sub_Field"}, null,null,  null, null,null);

  if (cursor != null) {
     cursor.moveToFirst();
     String name = cursor.getString(0);
     myText.setText(name);
  }

} catch (SQLiteException e ) {
   myText = (TextView) findViewById(R.id.txt);
   myText.setText("Try Again, you're soon to achieve your Goal...");
   myText.setTextSize(20);
}

Answer 1

在您查詢（選擇）您的表名是“BOOK”，但您正在創建表“BOOKS”並將數據插入“BOOKS”