android 怎么讀取數(shù)據(jù)庫中的數(shù)據(jù)

android讀取數(shù)據(jù)庫可以使用sqlite一些api進(jìn)行讀取，實例如下：

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/**

* 查找一條數(shù)據(jù)

* @param uid

*/

public User find(Integer uid){

SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //創(chuàng)建數(shù)據(jù)庫輔助類

Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //創(chuàng)建一個游標(biāo)

if(cursor.moveToFirst()){ //循環(huán)遍歷查找數(shù)組

int uid2=cursor.getInt(cursor.getColumnIndex("uid"));

String uname=cursor.getString(cursor.getColumnIndex("uname"));

String uaddress=cursor.getString(cursor.getColumnIndex("uaddress"));

User user=new User();

user.setUid(uid2);

user.setUname(uname);

user.setUaddress(uaddress);

return user;

}

cursor.close();

return null;

}

android怎么直接獲取數(shù)據(jù)庫數(shù)據(jù)

android讀取數(shù)據(jù)庫可以使用sqlite一些api進(jìn)行讀取，實例如下：

/**

* 查找一條數(shù)據(jù)

* @param uid

*/

public User find(Integer uid){

SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //創(chuàng)建數(shù)據(jù)庫輔助類

Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //創(chuàng)建一個游標(biāo)

if(cursor.moveToFirst()){ //循環(huán)遍歷查找數(shù)組

int uid2=cursor.getInt(cursor.getColumnIndex("uid"));

String uname=cursor.getString(cursor.getColumnIndex("uname"));

String uaddress=cursor.getString(cursor.getColumnIndex("uaddress"));

User user=new User();

user.setUid(uid2);

user.setUname(uname);

user.setUaddress(uaddress);

return user;

}

cursor.close();

return null;

}

android 怎樣獲取后臺的數(shù)據(jù)？

可使用android自帶的httpclient框架，向后臺發(fā)起請求，獲取數(shù)據(jù)。\x0d\x0a\x0d\x0a1. GET 方式傳遞參數(shù)\x0d\x0a//先將參數(shù)放入List，再對參數(shù)進(jìn)行URL編碼\x0d\x0aList params = new LinkedList();\x0d\x0aparams.add(new BasicNameValuePair("param1", "數(shù)據(jù)")); //增加參數(shù)1\x0d\x0aparams.add(new BasicNameValuePair("param2", "value2"));//增加參數(shù)2\x0d\x0aString param = URLEncodedUtils.format(params, "UTF-8");//對參數(shù)編碼\x0d\x0aString baseUrl = "服務(wù)器接口完整URL";\x0d\x0aHttpGet getMethod = new HttpGet(baseUrl + "?" + param);//將URL與參數(shù)拼接\x0d\x0aHttpClient httpClient = new DefaultHttpClient();\x0d\x0atry {\x0d\x0a HttpResponse response = httpClient.execute(getMethod); //發(fā)起GET請求\x0d\x0a Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //獲取響應(yīng)碼\x0d\x0a Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//獲取服務(wù)器響應(yīng)內(nèi)容\x0d\x0a} catch (ClientProtocolException e) {\x0d\x0a e.printStackTrace();\x0d\x0a} catch (IOException e) {\x0d\x0a e.printStackTrace();\x0d\x0a}\x0d\x0a\x0d\x0a2. POST方式 方式傳遞參數(shù)\x0d\x0a//和GET方式一樣，先將參數(shù)放入List\x0d\x0aparams = new LinkedList();\x0d\x0aparams.add(new BasicNameValuePair("param1", "Post方法"));//增加參數(shù)1\x0d\x0aparams.add(new BasicNameValuePair("param2", "第二個參數(shù)"));//增加參數(shù)2\x0d\x0atry {\x0d\x0a HttpPost postMethod = new HttpPost(baseUrl);//創(chuàng)建一個post請求\x0d\x0a postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //將參數(shù)填入POST Entity中\(zhòng)x0d\x0a HttpResponse response = httpClient.execute(postMethod); //執(zhí)行POST方法\x0d\x0a Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //獲取響應(yīng)碼\x0d\x0a Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //獲取響應(yīng)內(nèi)容\x0d\x0a} catch (UnsupportedEncodingException e) {\x0d\x0a e.printStackTrace();\x0d\x0a} catch (ClientProtocolException e) {\x0d\x0a e.printStackTrace();\x0d\x0a} catch (IOException e) {\x0d\x0a e.printStackTrace();\x0d\x0a}

android中在怎么獲取數(shù)據(jù)庫數(shù)據(jù)

android讀取數(shù)據(jù)庫可以使用sqlite一些api進(jìn)行讀取，實例如下：

/**

* 查找一條數(shù)據(jù)

* @param uid

*/

public User find(Integer uid){

SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //創(chuàng)建數(shù)據(jù)庫輔助類

Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //創(chuàng)建一個游標(biāo)

if(cursor.moveToFirst()){ //循環(huán)遍歷查找數(shù)組

int uid2=cursor.getInt(cursor.getColumnIndex("uid"));

String uname=cursor.getString(cursor.getColumnIndex("uname"));

String uaddress=cursor.getString(cursor.getColumnIndex("uaddress"));

User user=new User();

user.setUid(uid2);

user.setUname(uname);

user.setUaddress(uaddress);

return user;

}

cursor.close();

return null;

}

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