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android读取数据,android读取数据线数据
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android 怎么读取数据库中的数据
android读取数据库可以使用sqlite一些api进行读取，实例如下：
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/**
* 查找一条数据
* @param uid
*/
public User find(Integer uid){
SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //创建数据库辅助类
Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //创建一个游标
if(cursor.moveToFirst()){ //循环遍历查找数组
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;
}
相关问答
Q1: android怎么直接获取数据库数据
android读取数据库可以使用sqlite一些api进行读取，实例如下：
/**
* 查找一条数据
* @param uid
*/
public User find(Integer uid){
SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //创建数据库辅助类
Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //创建一个游标
if(cursor.moveToFirst()){ //循环遍历查找数组
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;
}
Q2: android 怎样获取后台的数据？
可使用android自带的httpclient框架，向后台发起请求，获取数据。\x0d\x0a\x0d\x0a1. GET 方式传递参数\x0d\x0a//先将参数放入List，再对参数进行URL编码\x0d\x0aList params = new LinkedList();\x0d\x0aparams.add(new BasicNameValuePair("param1", "数据")); //增加参数1\x0d\x0aparams.add(new BasicNameValuePair("param2", "value2"));//增加参数2\x0d\x0aString param = URLEncodedUtils.format(params, "UTF-8");//对参数编码\x0d\x0aString baseUrl = "服务器接口完整URL";\x0d\x0aHttpGet getMethod = new HttpGet(baseUrl + "?" + param);//将URL与参数拼接\x0d\x0aHttpClient httpClient = new DefaultHttpClient();\x0d\x0atry {\x0d\x0a HttpResponse response = httpClient.execute(getMethod); //发起GET请求\x0d\x0a Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码\x0d\x0a Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//获取服务器响应内容\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 方式传递参数\x0d\x0a//和GET方式一样，先将参数放入List\x0d\x0aparams = new LinkedList();\x0d\x0aparams.add(new BasicNameValuePair("param1", "Post方法"));//增加参数1\x0d\x0aparams.add(new BasicNameValuePair("param2", "第二个参数"));//增加参数2\x0d\x0atry {\x0d\x0a HttpPost postMethod = new HttpPost(baseUrl);//创建一个post请求\x0d\x0a postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将参数填入POST Entity中\x0d\x0a HttpResponse response = httpClient.execute(postMethod); //执行POST方法\x0d\x0a Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码\x0d\x0a Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //获取响应内容\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}
Q3: android中在怎么获取数据库数据
android读取数据库可以使用sqlite一些api进行读取，实例如下：
/**
* 查找一条数据
* @param uid
*/
public User find(Integer uid){
SQLiteDatabase db=dbOpenHelper.getReadableDatabase(); //创建数据库辅助类
Cursor cursor =db.rawQuery("select * from user where uid=?", new String[]{uid.toString()}); //创建一个游标
if(cursor.moveToFirst()){ //循环遍历查找数组
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;
}
