Android SQLite使用
创建表
db.execSQL("CREATE TABLE IF NOT EXISTS "
+ RadioDbConst.RadioStation.TABLE_NAME + " ("
+ RadioDbConst.RadioStation._ID
+ " integer primary key autoincrement,"
+ RadioDbConst.RadioStation.FREQUENCY + " text,"
+ RadioDbConst.RadioStation.TITLE + " text,"
+ RadioDbConst.RadioStation.BAND + " integer,"
+ RadioDbConst.RadioStation.IS_STERO + " integer,"
+ RadioDbConst.RadioStation.TYPE + " integer);");
使用Cursor实现增删改查功能
使用Cursor增加和修改：
ContentValues values = new ContentValues();
values.put(RadioDbConst.RadioStation.BAND, station.getBand());
values.put(RadioDbConst.RadioStation.FREQUENCY, station.getFrequencyStr());
values.put(RadioDbConst.RadioStation.IS_STERO, station.isStereoInt());
values.put(RadioDbConst.RadioStation.TYPE, station.getType());
ContentResolver resolver = mContext.getContentResolver();
StationInfo mInfo = getCollectStation(station.getBand(), station.getFrequencyStr());
if (null != mInfo) {
Log.i(TAG, "collect -- has");
if (mInfo.getType() != 2 || mInfo.isStereoInt() != station.isStereoInt()) {
Log.i(TAG, "collect -- update");
String selection = RadioDbConst.RadioStation.TYPE + " = ?" + " and " + RadioDbConst.RadioStation.IS_STERO + " ?";
String[] selectionArgs = { String.valueOf(2), String.valueOf(station.isStereoInt()) };
resolver.update(RadioProvider.CONTENT_URI_COLLECT, values, selection, selectionArgs);
}
} else {
Log.i(TAG, "collect -- insert value:" + values.getAsString(RadioDbConst.SavedStation.FREQUENCY));
resolver.insert(RadioProvider.CONTENT_URI_COLLECT, values);
}
使用Cursor删除：
int id = mContext.getContentResolver().delete(RadioProvider.CONTENT_URI_RADIO_STATION, selection, selectionArgs);
使用Cursor查询：
String selection = RadioDbConst.RadioStation.BAND + " = ? " + "and" + RadioDbConst.RadioStation.FREQUENCY + " = ?";
String[] selectionArgs = { fre };
StationInfo si = null;
Cursor cursor = mContext.getContentResolver().query(RadioProvider.CONTENT_URI_COLLECT, null, selection, selectionArgs, null);
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
int b = cursor.getInt(cursor.getColumnIndex(RadioDbConst.RadioStation.IS_STERO));
int type = cursor.getInt(cursor.getColumnIndex(RadioDbConst.RadioStation.TYPE));
si = new StationInfo(band, fre, b, type);
Log.e("si", si.toString());
}
cursor.close();