// 插入数据
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
Uri insertUri = null;
switch (MATCHER.match(uri)) {
case PERSONS:
long rowid = db.insert("person", "name", values);
insertUri = ContentUris.withAppendedId(uri, rowid);
break;
default:
throw new IllegalArgumentException("Unkwon Uri:" + uri.toString());
}
return insertUri;
}
// 删除数据
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
int count = 0;
switch (MATCHER.match(uri)) {
case PERSONS:
count = db.delete("person", selection, selectionArgs);
return count;
case PERSON:
long id = ContentUris.parseId(uri);
String where = "_id=" + id;
if (selection != null && !"".equals(selection)) {
where = selection + " and " + where;
}
count = db.delete("person", where, selectionArgs);
return count;
default:
throw new IllegalArgumentException("Unkwon Uri:" + uri.toString());
}
}
// 查询数据
@Override
public Cursor query(
Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
switch (MATCHER.match(uri)) {
case PERSONS:
// 查询所有的数据
return db.query("person", projection, selection, selectionArgs, null, null, sortOrder);
case PERSON:
// 查询某个ID的数据
// 通过ContentUris这个工具类解释出ID
long id = ContentUris.parseId(uri);
String where = " _id=" + id;
if (!"".equals(selection) && selection != null) {
where = selection + " and " + where;
}
return db.query("person", projection, where, selectionArgs, null, null, sortOrder);
default:
throw new IllegalArgumentException("unknow uri" + uri.toString());
}
}