php - 读取所有带有用户ID的mysql数据库项

Question

大家好，我正在实现一些读取所有 mysql 数据库项目并将其显示在 ListView 中的功能，但使用 WHERE 子句 (SELECT * FROM tb_class_record WHERE coach_id = '?') 类似的东西。我的目标是当我使用 ID 为“INST-20131296”登录时，仅显示 ID 为“INST-20131296”的项目。对于具有不同 ID 的其他用户也是如此。这是主页，您可以看到我使用 ID“INST-20131296”登录 http://imgur.com/wDQTscU

这是填充项目的类(class)记录页面 http://imgur.com/y3yglaK

我的问题是，当我登录填充的 ListView 时，它显示具有不同 ID 的所有项目，我想要的是它应该显示具有我的用户 ID 的项目，例如 INST-20131296

这是我的 php 脚本:

<?php   
$link = mysql_pconnect("localhost", "root", "") or die("Could not connect");
mysql_select_db("dbmobile_class_record") or die("Could not select database");

$arr = array();

$rs = mysql_query("SELECT * FROM tb_class_record ");

while($obj = mysql_fetch_object($rs)) {
$arr[] = $obj;
}
echo '{"class_records":'.json_encode($arr).'}';
?>

这是我的java文件

public class ClassRecord extends AppCompatActivity {
    private ListView mylistView;
    String text;
    TextView inst_id, desc, sc, sched,hour, day, room, acad;
    FloatingActionButton fab;
    ArrayList<HashMap<String, String>> classrecordList = new ArrayList<HashMap<String, String>>();

    private static String url = "http://192.168.0.106/MobileClassRecord/getClassRecord.php";

    private static final String TAG_CR = "class_records";
    private static final String TAG_ID = "instructor_id";
    private static final String TAG_DESC = "description";
    private static final String TAG_SC = "subj_code";
    private static final String TAG_SCHED = "sched_type";
    private static final String TAG_HOUR = "hour";
    private static final String TAG_DAY = "day";
    private static final String TAG_RM = "room";
    private static final String TAG_ACAD = "acad";

    JSONArray classrecord = null;


    @Override
    public void onBackPressed() {
        Intent intent = new Intent(ClassRecord.this, MainActivity.class);
        startActivity(intent);
        super.onBackPressed();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_class_record);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent fabIntent = new Intent(ClassRecord.this, AddClassRecord.class);
                startActivity(fabIntent);

            }
        });
        new JSONParse().execute();
        classrecordList =new ArrayList<HashMap<String, String>>();

    }

    class JSONParse extends AsyncTask<String, String, JSONObject>{
        private ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            inst_id = (TextView) findViewById(R.id.inst_id);
            desc = (TextView) findViewById(R.id.desc);
            sc = (TextView) findViewById(R.id.subj_code);
            sched= (TextView) findViewById(R.id.sched);
            hour=(TextView) findViewById(R.id.hour);
            day=(TextView) findViewById(R.id.day);
            room = (TextView) findViewById(R.id.room);
            acad = (TextView) findViewById(R.id.acad);
            pDialog = new ProgressDialog(ClassRecord.this);
            pDialog.setMessage("Getting Data from Database...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected JSONObject doInBackground(String... params) {
            JSONParser jParser = new JSONParser();

            JSONObject json = jParser.getJSONFromUrl(url);
            return json;
        }

        @Override
        protected void onPostExecute(JSONObject jsonObject) {
            pDialog.dismiss();
            try {
                classrecord = jsonObject.getJSONArray(TAG_CR);
                for (int i = 0; i < classrecord.length(); i++){
                    JSONObject c = classrecord.getJSONObject(i);

                    final String Inst_id = c.getString(TAG_ID);
                    String Desc = c.getString(TAG_DESC);
                    String Sc = c.getString(TAG_SC);
                    String Sched = c.getString(TAG_SCHED);
                    String Hour = c.getString(TAG_HOUR);
                    String Day = c.getString(TAG_DAY);
                    String Rm = c.getString(TAG_RM);
                    String Acad = c.getString(TAG_ACAD);

                    HashMap<String, String> map = new HashMap<String, String>();

                    map.put(TAG_ID, Inst_id);
                    map.put(TAG_DESC, Desc);
                    map.put(TAG_SC, Sc);
                    map.put(TAG_SCHED, Sched);
                    map.put(TAG_HOUR, Hour);
                    map.put(TAG_DAY, Day);
                    map.put(TAG_RM, Rm);
                    map.put(TAG_ACAD, Acad);

                    classrecordList.add(map);

                    mylistView = (ListView) findViewById(R.id.list);
                    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
                    fab.attachToListView(mylistView);
                    ListAdapter adapter = new SimpleAdapter(ClassRecord.this, classrecordList,
                            R.layout.list, new String[]{TAG_ID, TAG_DESC, TAG_SC, TAG_SCHED, TAG_HOUR, TAG_DAY, TAG_RM, TAG_ACAD},
                            new int[]{R.id.inst_id, R.id.desc, R.id.subj_code, R.id.sched, R.id.hour, R.id.day, R.id.room, R.id.acad});

                    mylistView.setAdapter(adapter);
                    mylistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                                    String DESC = ((TextView) (view.findViewById(R.id.desc))).getText().toString();
                                    String CODE = ((TextView) (view.findViewById(R.id.subj_code))).getText().toString();
                                    SharedPreferences preferences = getSharedPreferences("MyApp", MODE_PRIVATE);
                                    preferences.edit().putString("desc", DESC).commit();
                                    preferences.edit().putString("code", CODE).commit();
                                    Intent intent = new Intent(ClassRecord.this, SpecificClassRecord.class);
                                    startActivity(intent);

                        }
                    });
                }
            }catch (JSONException e){
                e.printStackTrace();
            }
        }
    }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_class_record, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()){
            case android.R.id.home:
                Intent intent = new Intent(ClassRecord.this, MainActivity.class);
                startActivity(intent);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

正如已经指出的 - 使用旧的、现已弃用的 mysql_* 系列函数不是一个好主意，而是使用 mysqli 或 PDO

假设您的 Java 代码可以将 ID 发送到 PHP 脚本，那么我希望您可以利用以下内容(尽管我不太确定我的字段是否正确 - 它们是根据 Java 代码猜测的)

/* Create your mysqli connection */
$dbhost =   'localhost';
$dbuser =   'root'; 
$dbpwd  =   'xxx'; 
$dbname =   'mydb';

$conn   =   new mysqli( $dbhost, $dbuser, $dbpwd, $dbname );

$arr=array();

/* Prepare your sql & bind the placeholder */
$sql='select 
            `class_records`,
            `instructor_id`,
            `description`,
            `subj_code`,
            `sched_type`,
            `hour`,
            `day`,
            `room`,
            `acad` 
            from `tb_class_record` where `id`=?';

$stmt=$conn->prepare( $sql );
$stmt->bind_param('s', $id );

/*
  assuming you can append the Java ID variable to the url....
  private static String url = "http://192.168.0.106/MobileClassRecord/getClassRecord.php?id=<ID_VAR>";
*/

/* How are you passing the value of ID to PHP? via GET or POST? */
$id=$_GET['id'];

$res=$stmt->execute();

$stmt->bind_result( $class_records, $instructor_id, $description, $subj_code, $sched_type, $hour, $day, $room, $acad );


if( $res ){
    $stmt->fetch();

    $arr['class_records']=array(
        'class_records'=>$class_records,
        'instructor_id'=>$instructor_id,
        'description'=>$description,
        'subj_code'=>$subj_code,
        'sched_type'=>$sched_type,
        'hour'=>$hour,
        'day'=>$day,
        'room'=>$room,
        'acad'=>$acad
    );      
}

$stmt->close();
$conn->close();


/* Send the json response */
echo json_encode( $arr );

/*

*/