android查询数据库查询不到数据，不知道为什么

[ZSQ_ANDROID]

String[] columns = { "content", "optionA", "optionB", "optionC",
"optionD" };
String selection = "examSubject='" + ll_a
+ "' and chapter=? and type=? and difficult=? and num=?";
String[] selectionArgs = { "1", "1", "1", "10001" };
Cursor cursor = sqldb.query("q_question", columns, selection,
selectionArgs, null, null, null);
startManagingCursor(cursor);
Log.i("nnnnnnnnnnnn", cursor.getCount()
+ "nnnnnnnnnnnnn");//显示的是0？？？？？？？？？？？？？
while (cursor.moveToNext()) {
Log.i("valcontnet", cursor.getColumnIndex("content")
+ "cccccccccccc");

byte[] val = cursor.getBlob(cursor.getColumnIndex("content"));
Log.i("valcontnet", cursor.getColumnIndex("content")
+ "cccccccccccc");
byte[] vala =
cursor.getBlob(cursor.getColumnIndex("optionA"));
byte[] valb =
cursor.getBlob(cursor.getColumnIndex("optionB"));
byte[] valc =
cursor.getBlob(cursor.getColumnIndex("optionC"));
byte[] vald =
cursor.getBlob(cursor.getColumnIndex("optionD"));
try {
content.setText(new String(val, "GBK"));
opA.setText(new String(vala, "GBK"));
opB.setText(new String(valb, "GBK"));
opC.setText(new String(valc, "GBK"));
opD.setText(new String(vald, "GBK"));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

图片上显示的是从数据库里查找到的数据，但是在android类里就查找不到，不知道为什么，请求帮助？？？？

[hotkarriver]

是不是URI不对？要不试试selection里用大写的AND？

[mmorss]

sqldb。getReadableDatabase();

[tcmakebest]

得先有数据才能查，呵呵

[ZSQ_ANDROID]

数据库是从外边导入的，从这个导入的数据库中查找东西，一个条件的可以查询，多条件查询就查不出数据，我用sqlite3多条件就能查出来数据，谁遇到过这样的问题