【发布时间】：2015-04-04 16:47:30
【问题描述】：
我正在尝试将数据插入到 sqlite 数据库中，它们都是从 mysql 数据库中获取的名称、消息和图像。问题是如何使用 Blob 昆虫图像。图像是从 url 获取的。我想把它放在 sqite 表中....我知道他们说最好将其保存在 sdcard 上并将位置放在 sqlite 表中....但唯一的问题是用户可以删除一些我不想要的图像或重命名它们。
这是我的 sqlite 数据库类
public class DBTool extends SQLiteOpenHelper {
private Context appContext;
static final String firstname="firstname";
static final String lastname="lastname";
public DBTool(Context applicationContext){
super(applicationContext, "friend.db", null, 1);
this.appContext = applicationContext;
}
@Override
public void onCreate(SQLiteDatabase database) {
String query = "CREATE TABLE friends ( contactId INTEGER PRIMARY KEY, name TEXT, " +
"message TEXT, image BLOB)";
database.execSQL(query);
}
@Override
public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
String query = "DROP TABLE IF EXISTS friends";
database.execSQL(query);
onCreate(database);
}
public void insertContact(HashMap<String, String> queryValues){
SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", queryValues.get("name"));
values.put("message", queryValues.get("message"));
values.put("image", queryValues.get("image"));
database.insert("friends", null, values);
database.close();
}
public int updateContact(HashMap<String, String> queryValues){
SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", queryValues.get("name"));
values.put("message", queryValues.get("message"));
values.put("image", queryValues.get("image"));
return database.update("friends", values,
"contactId" + " = ?", new String[] {queryValues.get("contactId") });
}
public void deleteContact(){
SQLiteDatabase database = this.getWritableDatabase();
String deleteQuery = "DELETE FROM friends ";
database.execSQL(deleteQuery);
}
public ArrayList<HashMap<String, String>> getAllContacts(){
ArrayList<HashMap<String, String>> contactArrayList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM friends ";
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if(cursor.moveToFirst()){
do{
HashMap<String, String> contactMap = new HashMap<String, String>();
contactMap.put("name", cursor.getString(0));
contactMap.put("message", cursor.getString(1));
contactMap.put("image", cursor.getString(2));
contactArrayList.add(contactMap);
} while(cursor.moveToNext());
}
return contactArrayList;
}
public HashMap<String, String> getContactInfo(String id){
HashMap<String, String> contactMap = new HashMap<String, String>();
SQLiteDatabase database = this.getReadableDatabase();
String selectQuery = "SELECT * FROM friends WHERE contactId='" + id + "'";
Cursor cursor = database.rawQuery(selectQuery, null);
if(cursor.moveToFirst()){
do{
contactMap.put("name", cursor.getString(0));
contactMap.put("message", cursor.getString(1));
contactMap.put("image", cursor.getString(2));
} while(cursor.moveToNext());
}
return contactMap;
}
}
这是我获取数据和昆虫的课程
public class Chat extends SherlockListFragment {
JSONParser jsonParser = new JSONParser();
private static final String TAG_POSTS = "posts";
public static final String TAG_ID = "id";
public static final String TAG_NAME = "name";
public static final String TAG_pic = "pic";
public static final String TAG_MESSAGE = "message";
public static final String TAG_CATEGORIES_LOGO = "categories_logo";
DBTool dbTool = new DBTool(getActivity());
/*
user details
private static final String NAME = "name";
private static final String AGE = "age";
private static final String STATUS = "status";
private static final String PIC = "pic";
private static final String SEX = "sex"; String friendname,status;
private static final String TAG_SUCCESS = "success";*/
//user
private static final String URL_CATEGORY = "http://10.0.2.2/ochat/selectchat.php";
private ListView lv;
SharedPreferences sp ;
Bundle bon = new Bundle();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.friends, container, false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
new LoadComments().execute();
}
class LoadComments extends AsyncTask<Void, Void, ArrayList<HashMap<String,String>>> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
}
@Override
protected ArrayList<HashMap<String, String>> doInBackground(Void... arg0) {
ArrayList<HashMap<String, String>> categoryList = new ArrayList<HashMap<String, String>>();
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
String username = sp.getString("username", "anon");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
JSONObject json = jsonParser.makeHttpRequest(URL_CATEGORY, "POST",
params);
try {
JSONArray categories = json.getJSONArray(TAG_POSTS);
for (int i = 0; i < categories.length(); i++) {
String id = categories.getJSONObject(i).getString("TAG_ID");
String name = categories.getJSONObject(i).getString("TAG_NAME");
String pic = categories.getJSONObject(i).getString("TAG_pic");
String message = categories.getJSONObject(i).getString("TAG_MESSAGE");
HashMap<String, String> queryValuesMap = new HashMap<String, String>();
queryValuesMap.put("name", name);
queryValuesMap.put("message",message);
DefaultHttpClient mHttpClient = new DefaultHttpClient();
HttpGet mHttpGet = new HttpGet(pic);
HttpResponse mHttpResponse = mHttpClient.execute(mHttpGet);
if (mHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = mHttpResponse.getEntity();
if ( entity != null) {
// insert to database
queryValuesMap.put("image", EntityUtils.toByteArray(entity));
}
}
dbTool.insertContact(queryValuesMap);
}
}catch (Throwable e){
e.printStackTrace();
}
return categoryList;
}
@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
super.onPostExecute(result);
}
}
}
问题出在
queryValuesMap.put("image", EntityUtils.toByteArray(entity));
在说
HashMap类型中的put(String, String)方法不适用于参数(String, byte[])
我不知道这是我安排的方式还是有更好的方法来做到这一点.. 去想法from this site。
【问题讨论】：