Select Query ArrayList java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0

【问题标题】：Select Query ArrayList java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0Select Query ArrayList java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
【发布时间】：2020-02-01 18:39:18
【问题描述】：

我收到此错误：

"java.lang.IndexOutOfBoundsException: 无效索引 0，大小为 0"。

我有 DatabaseHelper、Select 和 Insert Classes。所以我试图从 DatabaseHelper 类中获取数据以显示在 Search(Select)Class 上。我在 DatabaseHelper 上将“UrunKodu”声明为列名，但我不知道下一步该做什么在我的搜索类上连接这个“UrunKodu”声明。

这是数据库助手

public class DatabaseHelper extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "Urunler.db";
private static final String TABLE_NAME = "urunler_tablosu";
private static final String COL_2 = "UrunKodu";
private static final String COL_3 = "UrunAdi";
private static final String COL_4 = "Adet";              
private static final String COL_5 = "AlisFiyati";
private static final String COL_6 = "SatisFiyati";
private ArrayList<HashMap<String, String>> YourList = new ArrayList<>();


DatabaseHelper(Context context){
    super(context,DATABASE_NAME,null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("create table " + TABLE_NAME +" (UrunKodu TEXT,UrunAdi TEXT,Adet REAL,AlisFiyati REAL,SatisFiyati REAL )");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    db.execSQL("DROP TABLE IF EXISTS urunler_tablosu");
    onCreate(db);
}


boolean insertData(String ukodu, String uadi, String adet, String afiyati, String sfiyati){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COL_2,ukodu);
    contentValues.put(COL_3,uadi);
    contentValues.put(COL_4,adet);
    contentValues.put(COL_5,afiyati);
    contentValues.put(COL_6,sfiyati);
    long result = db.insert(TABLE_NAME,null,contentValues);
    return result != -1;
}

//Get all item in your database
public ArrayList<HashMap<String, String>> getAllDatabaseData(String UrunKodu) { // we use the id to find it corresponding user details
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor res =  db.rawQuery(" SELECT * FROM '" + TABLE_NAME + "' WHERE UrunKodu='" + UrunKodu + "'",null);
    res.moveToFirst();
    while(!res.isAfterLast()){
        HashMap<String, String> array_list = new HashMap<>();
        array_list.put("Urunkodu",res.getString(res.getColumnIndex(COL_2)));
        array_list.put("UrunAdi",res.getString(res.getColumnIndex(COL_3)));
        array_list.put("Adet",res.getString(res.getColumnIndex(COL_4)));
        array_list.put("AlisFiyati",res.getString(res.getColumnIndex(COL_5)));
        array_list.put("SatisFiyati",res.getString(res.getColumnIndex(COL_6)));
        YourList.add(array_list);
        res.moveToNext();
    }
    return YourList;

}

}

这是搜索（选择类）

public class UrunKontrol extends AppCompatActivity {

private ArrayList<HashMap<String, String >>DataList = new ArrayList<>();
EditText editkontukodu,editkontuadi,editkontadet,editkontafiyati,editkontsfiyati;
Button arabuton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_urun_kontrol);

    editkontukodu = (EditText)findViewById(R.id.kontrolbarkodno);
    editkontuadi = (EditText)findViewById(R.id.kontrolurunadi);
    editkontadet = (EditText)findViewById(R.id.kontrolurunadeti);
    editkontafiyati = (EditText)findViewById(R.id.kontrolurunalisfiyati);
    editkontsfiyati = (EditText)findViewById(R.id.kontrolurunsatisfiyati);
    arabuton = (Button)findViewById(R.id.aramabutonu);
    arabuton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            DataList = new DatabaseHelper(UrunKontrol.this).getAllDatabaseData(UrunKodu);   //Here I am getting error
            editkontuadi.setText(DataList.get(0).get("UrunAdi"));
            editkontadet.setText(DataList.get(0).get("Adet"));
            editkontafiyati.setText(DataList.get(0).get("AlisFiyati"));
            editkontsfiyati.setText(DataList.get(0).get("SatisFiyati"));
        }
    });

}

}

这是插入类

public class Urunkayit extends AppCompatActivity {

DatabaseHelper myDb;
EditText editkayitbarkodno,editkontrolurunadi,editkontrolurunadeti,editkontrolurunalisfiyati,editkontrolurunsatisfiyati;
Button kaydetbuton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_urunkayit);

    myDb = new DatabaseHelper(this);

    editkayitbarkodno = (EditText)findViewById(R.id.kayitbarkodno);
    editkontrolurunadi = (EditText)findViewById(R.id.kayiturunadi);
    editkontrolurunadeti = (EditText)findViewById(R.id.kayiturunadeti);
    editkontrolurunalisfiyati = (EditText)findViewById(R.id.kayiturunalisfiyati);
    editkontrolurunsatisfiyati = (EditText)findViewById(R.id.kayiturunsatisfiyati);
    kaydetbuton = (Button) findViewById(R.id.kayitbutonu);

    urunKaydetme();

}
public void urunKaydetme(){
    kaydetbuton.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    boolean isInserted = myDb.insertData(editkayitbarkodno.getText().toString(),
                            editkontrolurunadi.getText().toString(),
                            editkontrolurunadeti.getText().toString(),
                            editkontrolurunalisfiyati.getText().toString(),
                            editkontrolurunsatisfiyati.getText().toString());
                    if (isInserted = true){
                        Toast.makeText(Urunkayit.this,"Ürün Kaydedildi",Toast.LENGTH_LONG).show();
                        editkayitbarkodno.setText("");
                        editkontrolurunadi.setText("");
                        editkontrolurunadeti.setText("");
                        editkontrolurunalisfiyati.setText("");
                        editkontrolurunsatisfiyati.setText("");

                    }
                    else
                        Toast.makeText(Urunkayit.this,"Ürün Kaydedilemedi",Toast.LENGTH_LONG).show();
                }
            }
    );
}

}

我不知道如何在搜索类中声明它们（大小和 UrunKodu）

【问题讨论】：

    标签： android sqlite indexoutofboundsexception


    【解决方案1】：

    完整的示例，包含您想要的数据库代码以及正常工作和测试的插入、查看和搜索功能。
    总共 6 个 java 文件和 4 个布局文件。
    1.Database.java

    public class Database {
public static final String DATABASE_NAME = "Urunler";
public static final String TABLE_NAME = "urunler_tablosu";
public static final int DATABSE_VERSION = 1;


public static final String URUNKODU = "UrunKodu";
public static final String URUNADI = "UrunAdi";
public static final String ADET = "Adet";
public static final String ALISFIYATI = "AlisFiyati";
public static final String SATISFIYATI = "SatisFiyati";


//to create a table
private static final String TABLE_CREATE_URUNLER_TABLOSU = "create table urunler_tablosu(UrunKodu TEXT,UrunAdi TEXT,Adet REAL,AlisFiyati REAL,SatisFiyati REAL);";

private Context context;
SQLiteDatabase db;    // manipulation with database
DatabaseHelper dbhelper;

public Database(Context ctx) {
    // TODO Auto-generated constructor stub
    this.context = ctx;
    dbhelper = new DatabaseHelper(ctx);
}


//SQLITEOpenHelper has methods to creae and open
class DatabaseHelper extends SQLiteOpenHelper {
    //DatabaseHelper's constructor will create the database
    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABSE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(TABLE_CREATE_URUNLER_TABLOSU);
        Log.d("table is created..", "URUNLER_TABLOSU");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
        onCreate(db);
    }


}


public Database Open() throws SQLException {
    db = dbhelper.getWritableDatabase();
    return this;
}

public void Close() {
    dbhelper.close();
}

//==== as mapping REAL in sql is float in java =================
public long insertData(String UrunKodu, String UrunAdi, float Adet, float AlisFiyati, float SatisFiyati) {
    ContentValues initialvalues = new ContentValues();

    initialvalues.put(URUNKODU, UrunKodu);
    initialvalues.put(URUNADI, UrunAdi);
    initialvalues.put(ADET, Adet + "");
    initialvalues.put(ALISFIYATI, AlisFiyati + "");
    initialvalues.put(SATISFIYATI, SatisFiyati + "");

    Log.d(URUNKODU, UrunKodu + "");
    Toast.makeText(context, "Data inserted", Toast.LENGTH_LONG).show();

    return db.insert(TABLE_NAME, null, initialvalues);

}

public Cursor getAllData() {
    String query = "SELECT * FROM " + TABLE_NAME;
    Log.d("gks query=", query + "");
    Cursor cur = db.rawQuery(query, null);
    return cur;
}

}

    2.POJOUrunKodu.java

    public class POJOUrunKodu {

String UrunKodu, UrunAdi,  Adet,  AlisFiyati,  SatisFiyati;

public POJOUrunKodu(String urunKodu, String urunAdi, String adet, String alisFiyati, String satisFiyati) {
    UrunKodu = urunKodu;
    UrunAdi = urunAdi;
    Adet = adet;
    AlisFiyati = alisFiyati;
    SatisFiyati = satisFiyati;
}
}

    3.CustomAdapter.java

    public class CustomAdapter extends BaseAdapter {

private ArrayList<POJOUrunKodu> _data;
Context _c;

CustomAdapter( Context c,ArrayList<POJOUrunKodu> data) {
    _data = data;
    _c = c;
    Log.d("inside customAdapter", "inside customAdapter constructor...");
}

public int getCount() {
    // TODO Auto-generated method stub
    return _data.size();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return _data.get(position);
}

public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) _c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.entityurunkodu, null);
    }

    TextView tvlist_urunKodu = (TextView) v.findViewById(R.id.tvlist_urunKodu);
    TextView tvlist_urunAdi = (TextView) v.findViewById(R.id.tvlist_urunAdi);
    TextView tvlist_adet = (TextView) v.findViewById(R.id.tvlist_adet);
    TextView tvlist_alisFiyati = (TextView) v.findViewById(R.id.tvlist_alisFiyati);
    TextView tvlist_satisFiyati = (TextView) v.findViewById(R.id.tvlist_satisFiyati);

    Log.d("tvcredit==>", " "+tvlist_urunAdi.getText().toString());

    POJOUrunKodu tpj = _data.get(position);
    tvlist_urunKodu.setText(tpj.UrunKodu+"");
    tvlist_urunAdi.setText(tpj.UrunAdi+"");
    tvlist_adet.setText(tpj.Adet+"");
    tvlist_alisFiyati.setText(tpj.AlisFiyati+"");
    tvlist_satisFiyati.setText(tpj.SatisFiyati+"");

    return v;
}

}

    4.InsertActivity.java

    public class InsertActivity extends AppCompatActivity {

EditText edt_UrunKodu, edt_UrunAdi, edt_Adet, edt_AlisFiyati, edt_SatisFiyati;

Button btn_insert;

Database db;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_insert);


    //======== findviewbyid starts ======
    edt_UrunKodu = (EditText) findViewById(R.id.edt_UrunKodu);
    edt_UrunAdi = (EditText) findViewById(R.id.edt_UrunAdi);
    edt_Adet = (EditText) findViewById(R.id.edt_Adet);
    edt_AlisFiyati = (EditText) findViewById(R.id.edt_AlisFiyati);
    edt_SatisFiyati = (EditText) findViewById(R.id.edt_SatisFiyati);

    btn_insert = (Button) findViewById(R.id.btn_insert);
    //======== findviewbyid ends ======


    db=new Database(getApplicationContext());
    db.Open();
    db.Close();

    btn_insert.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (edt_UrunKodu.getText().toString().trim().length() != 0 ||
                    edt_UrunAdi.getText().toString().trim().length() != 0 ||
                    edt_Adet.getText().toString().trim().length() != 0 ||
                    edt_AlisFiyati.getText().toString().trim().length() != 0 ||
                    edt_SatisFiyati.getText().toString().trim().length() != 0) {

                String sUrunKodu=edt_UrunKodu.getText().toString().trim();
                String sUrunAdi=edt_UrunAdi.getText().toString().trim();
                String sAdet=edt_Adet.getText().toString().trim();
                String sAlisFiyati=edt_AlisFiyati.getText().toString().trim();
                String sSatisFiyati=edt_SatisFiyati.getText().toString().trim();


                db.Open();
                db.insertData(sUrunKodu,sUrunAdi,Float.parseFloat(sAdet),Float.parseFloat(sAlisFiyati),Float.parseFloat(sSatisFiyati));
                db.Close();

            }
        }
    });
}
}

    5.SearchViewActivity.java

    public class SearchViewActivity extends AppCompatActivity {

EditText edt_search;
ListView lv_data;

Database db;

ArrayList<POJOUrunKodu> arrayListUrunKodu;
ArrayList<POJOUrunKodu> arrayListUrunKodu_search;

CustomAdapter customAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search_view);


    edt_search=(EditText)findViewById(R.id.edt_search);
    lv_data=(ListView)findViewById(R.id.lv_data);

    db=new Database(getApplicationContext());
    db.Open();
    db.Close();

    load_all_data();

    edt_search.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            String text = s.toString();
            filter(text);
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });



}


public void load_all_data()
{
    arrayListUrunKodu=new ArrayList<>();
    arrayListUrunKodu_search=new ArrayList<>();
    db.Open();

    Cursor cur=db.getAllData();

    if(cur.moveToFirst())
    {
        do {

            String sUrunKodu=cur.getString(0);
            String sUrunAdi=cur.getString(1);
            String sAdet=cur.getString(2);
            String sAlisFiyati=cur.getString(3);
            String sSatisFiyati=cur.getString(4);

            arrayListUrunKodu.add(new POJOUrunKodu(sUrunKodu,sUrunAdi,sAdet,sAlisFiyati,sSatisFiyati));
            arrayListUrunKodu_search.add(new POJOUrunKodu(sUrunKodu,sUrunAdi,sAdet,sAlisFiyati,sSatisFiyati));

        }while (cur.moveToNext());
    }

    cur.close();
    db.Close();

    customAdapter=new CustomAdapter(SearchViewActivity.this,arrayListUrunKodu);
    lv_data.setAdapter(customAdapter);
}

// =========Filter method starts=======
public void filter(String charText) {
    charText = charText.toLowerCase(Locale.getDefault());
    Log.d("filter",charText+"");
    arrayListUrunKodu.clear();
    if (charText.length() == 0) {
        arrayListUrunKodu.addAll(arrayListUrunKodu_search);
        Log.d("data","all");
        Log.d("data size=",arrayListUrunKodu.size()+"");
    } else {
        for (POJOUrunKodu pod : arrayListUrunKodu_search) {

            if (pod.UrunKodu.toLowerCase(Locale.getDefault()).contains(charText)||
                    pod.UrunAdi.toLowerCase(Locale.getDefault()).contains(charText)) {
                arrayListUrunKodu.add(pod);
            }

        }
        Log.d("data","filter");
        Log.d("filter size=",arrayListUrunKodu.size()+"");
    }
    customAdapter.notifyDataSetChanged();


}
}

    6.MainActivity.java

    public class MainActivity extends AppCompatActivity {

Button btn_insert_data,btn_search_view_data;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    btn_insert_data=(Button)findViewById(R.id.btn_insert_data);
    btn_search_view_data=(Button)findViewById(R.id.btn_search_view_data);


    btn_insert_data.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_insert=new Intent(MainActivity.this,InsertActivity.class);
            startActivity(intent_insert);
        }
    });

    btn_search_view_data.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_insert=new Intent(MainActivity.this,SearchViewActivity.class);
            startActivity(intent_insert);
        }
    });

}
}

    布局文件在这里，自定义适配器需要这个实体文件

    1.entityurunkodu.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
>

<TextView
    android:id="@+id/tvlist_urunKodu"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:textColor="#f00"
    ></TextView>

<TextView
    android:id="@+id/tvlist_urunAdi"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:textColor="#789"
    android:layout_marginTop="5dp"
    ></TextView>

<TextView
    android:id="@+id/tvlist_adet"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:textColor="#00f"
    android:layout_marginTop="5dp"
    ></TextView>

<TextView
    android:id="@+id/tvlist_alisFiyati"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:textColor="#f0f"
    android:layout_marginTop="5dp"
    ></TextView>

<TextView
    android:id="@+id/tvlist_satisFiyati"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:textColor="#000"
    android:layout_marginTop="5dp"
    ></TextView>

    ==content_search_view.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".SearchViewActivity"
tools:showIn="@layout/activity_search_view"
android:orientation="vertical">


<EditText
    android:id="@+id/edt_search"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="seach urunkodu"
    android:textSize="15sp"
    android:textColor="#f00"/>

<ListView
    android:id="@+id/lv_data"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"/>

    =====content_insert.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".InsertActivity"
tools:showIn="@layout/activity_insert"
android:orientation="vertical">

<EditText
    android:id="@+id/edt_UrunKodu"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="UrunKodu"
    android:layout_marginTop="20dp"/>

<EditText
    android:id="@+id/edt_UrunAdi"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="UrunAdi"
    android:layout_marginTop="10dp"/>

<EditText
    android:id="@+id/edt_Adet"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Adet"
    android:layout_marginTop="10dp"/>

<EditText
    android:id="@+id/edt_AlisFiyati"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="AlisFiyati"
    android:layout_marginTop="10dp"/>

<EditText
    android:id="@+id/edt_SatisFiyati"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="SatisFiyati"
    android:layout_marginTop="10dp"/>


<Button
    android:id="@+id/btn_insert"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="INSERT"
    android:textSize="25sp"
    android:textColor="#fff"
    android:background="#f00"
    android:layout_marginTop="10dp"/>

    =====activity_main.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
android:gravity="center">

<Button
    android:id="@+id/btn_insert_data"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="INSERT DATA"
    android:textSize="25sp"
    android:textColor="#fff"
    android:background="#f00"/>

<Button
    android:id="@+id/btn_search_view_data"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Search and View DATA"
    android:layout_marginTop="50dp"
    android:textSize="25sp"
    android:textColor="#fff"
    android:background="#00f"/>

    因此，它是与 xml 文件、java 文件和活动文件完美结合的代码。 您可以根据需要添加内容和活动。您可以在 android studio 中使用 ALT+CLTR+L 进行对齐的任何地方。肯定会对你有所帮助。

    【讨论】：

    • 感谢您的回答，但我需要应用程序的功能，就像我尝试编写的那样。我将使用条形码扫描仪设备，它的功能是读、写、按 Enter。所以我想要的是在我将产品代码写入“editurunkodu”后，我将按回车键。然后有关产品的所需项目将显示在其他编辑文本上。
    • 我的意思是在输入产品后，你会有任何带有列表的警告对话框吗？
    • 我希望看到“产品不在数据库中”之类的内容，否则我只想将项目放置到编辑文本中。
    • 产品是怎么来的？
    • 他们不这样做 :D 我想这样做，但我不知道该怎么做 :) 我如何将结果放到编辑文本中？
    【解决方案2】：

    你的DataList返回空列表，访问前检查大小

    arabuton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        DataList = new DatabaseHelper(UrunKontrol.this).getAllDatabaseData(UrunKodu);   //Here I am getting error
        if(DataList.size > 0){
          editkontuadi.setText(DataList.get(0).get("UrunAdi"));
          editkontadet.setText(DataList.get(0).get("Adet"));
          editkontafiyati.setText(DataList.get(0).get("AlisFiyati"));
          editkontsfiyati.setText(DataList.get(0).get("SatisFiyati"));
        }
    }
});

    注意：还要调试您尝试获取的值是否存在于数据库中

    【讨论】：

    • 我对这些很陌生。你能告诉我我该怎么做吗？
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