大家好,我正在实现读取所有mysql数据库项并将其显示在listview中的功能,但使用了类似的WHERE子句(SELECT * FROM tb_class_record WHERE instructor_id = '?'
)。我的目标是当我使用ID"INST-20131296"登录时,因此只显示ID为"INST-20132196"的项目。其他ID不同的用户也是如此。这是主页,正如你所看到的,我是用"INST-20131296"登录的https://i.stack.imgur.com/zkNYU.jpg
这是类记录页面,项目在其中填充https://i.stack.imgur.com/U2MCH.jpg
我的问题是,当我登录到填充的列表视图时,它显示了具有不同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);
}
}
正如已经指出的那样,使用旧的、现已弃用的mysql_*
函数族不是一个好主意,而是使用mysqli
或PDO
假设您的Java代码可以将ID发送到PHP脚本,那么我希望您可以使用以下内容(当然,虽然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 );
/*
*/
好吧!我找到了我正在寻找的答案:)感谢@RamRaider,他的PHP脚本是我解决问题的基础:)非常感谢!。
这是脚本:
<?php
error_reporting(0);
$link = mysql_pconnect("localhost", "root", "") or die("Could not connect");
mysql_select_db("dbmobile_class_record") or die("Could not select database");
// array for JSON response
$response = array();
$id=$_GET['instructor_id'];
// get all items from tb_class_record table
$result = mysql_query("SELECT * FROM tb_class_record WHERE instructor_id = '$id'") or die(mysql_error());
if (mysql_num_rows($result) > 0) {
$response["class_records"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$class_record = array();
$class_record["class_record_id"] = $row["class_record_id"];
$class_record["instructor_id"] = $row["instructor_id"];
$class_record["subj_code"] = $row["subj_code"];
$class_record["description"] = $row["description"];
$class_record["sched_type"] = $row["sched_type"];
$class_record["hour"] = $row["hour"];
$class_record["day"] = $row["day"];
$class_record["room"] = $row["room"];
$class_record["acad"] = $row["acad"];
// push recorded items into response array
array_push($response["class_records"], $class_record);
}
// success
$response["success"] = 1;
}
else {
// class_record is empty
$response["success"] = 0;
$response["message"] = "No Records Found";
}
// echoing JSON response
echo json_encode($response);
?>