数据已插入SQLite Android数据库中，但未显示

时间：2018-12-26 05:03:43

标签： android sqlite

我试图插入一些取自用户的实时值，并试图将其传递给SQLite DB。数据已成功插入，但是当我转到下一个活动时，单击“显示数据”按钮，我得到的是空值。

尽管我可以看到，如果我继续添加这些值...列表会继续增加。

这是我的DataHelper类的代码

public class DataBaseHelper extends SQLiteOpenHelper {

public static final String DATABASE_NAME = "contact.db";
public static final String TABLE_NAME = "contact_table";

public static final String col_id = "ID";
public static final String col_name = "Name";
public static final String col_contact = "Contact";

public DataBaseHelper(Context context) {
    super(context, DATABASE_NAME, null, 1);

}

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    String sql_query = "CREATE TABLE " + TABLE_NAME + "("
            + col_id + " INTEGER PRIMARY KEY," + col_name + " TEXT,"
            + col_contact + " TEXT" + ")";
    sqLiteDatabase.execSQL(sql_query);

}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
    sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
    onCreate(sqLiteDatabase);
}

public boolean insertdata(String name, String contact) {
    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(col_name, name);
    contentValues.put(col_contact, contact);
    long result = sqLiteDatabase.insert(TABLE_NAME, null, contentValues);
    sqLiteDatabase.close();
    // To check whether data is inserted or not
    if (result == -1) {
        return false;
    } else {
        return true;
    }
}

public Cursor getAllData() {
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor res = db.rawQuery("Select * from " + TABLE_NAME, null);
    return res;
}
}

现在我有一个函数 ClickMe（），该函数在我的插入按钮

的OnClickListener中调用 
     private void ClickMe() {
    String NAME = name.getText().toString();
    String CONTACT = contact.getText().toString();
    Boolean result = dataBaseHelper.insertdata(NAME,CONTACT);
    if (result==true){
        Toast.makeText(this, "Data Inserted", Toast.LENGTH_SHORT).show();
        Log.d(NAME,"");
        Log.d(CONTACT,"");
    }
    else {
        Toast.makeText(this, "Sorry", Toast.LENGTH_SHORT).show();
    }
}

我正在为成功插入数据敬酒。 转到下一个下一个活动：

 button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
           Clickme();
        }
    });

此 Clickme（）的代码是：

 private void Clickme() {
     res = dataBaseHelper.getAllData();
    StringBuffer stringBuffer = new StringBuffer();
    if(res!= null && res.getCount()>0){
        while (res.moveToNext()){
            stringBuffer.append("Name: " + res.getString(1)+"\n");
            stringBuffer.append("Contact: " + res.getString(2)+"\n"+"\n");
        }
        name_tv.setText(stringBuffer.toString());
        Toast.makeText(this, "Data Retrieved Successfully", Toast.LENGTH_SHORT).show();
    }
    else{
        Toast.makeText(this, "No Data to retrieve", Toast.LENGTH_SHORT).show();
    }
}

结果...我得到姓名和联系人的空值。 我试图弄清楚为什么尽管插入了值却没有得到显示的值。

你们能帮我吗.. ??

如果还有比这更好的方法……那么请建议我。 谢谢.. !!

这是LOGCAT报告

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Remote Branch                    : refs/tags/AU_LINUX_ANDROID_LA.UM.7.3.R1.08.00.00.423.039
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2 个答案:

答案 0 :(得分：0)

使用以下命令更新您的Clickme函数：

private void Clickme() {
     res = dataBaseHelper.getAllData();
    StringBuffer stringBuffer = new StringBuffer();
    if(res!= null && res.getCount() > 0 && res.moveToFirst()){
       do {
            stringBuffer.append("Name: " + res.getString(1)+"\n");
            stringBuffer.append("Contact: " + res.getString(2)+"\n"+"\n");
        } while (res.moveToNext());

        name_tv.setText(stringBuffer.toString());
        Toast.makeText(this, "Data Retrieved Successfully", Toast.LENGTH_SHORT).show();
    }
    else{
        Toast.makeText(this, "No Data to retrieve", Toast.LENGTH_SHORT).show();
    }
}

我在您的if块中添加了一个附加条件：res.moveToFirst() 并将您的while循环更改为do-while

如果您想知道为什么我添加了moveToFirst，Refer this SO link； 另外，请不要忘记致电res.close()

来close your cursor

编辑：

也许是您的插入函数内部存在的问题：

您要插入Name和Contact，但是Id中没有ContentValues：

您的插入方法：

SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(col_name, name);
contentValues.put(col_contact, contact);
long result = sqLiteDatabase.insert(TABLE_NAME, null, contentValues);

由于您已经提到 Id 作为主键，并且没有任何价值，因此数据永远不会插入。

现在，您有两种方法可以解决此问题：

  1. 通过添加带有以下内容的AUTOINCREMENT来更改您的创建表查询：

    String sql_query = "CREATE TABLE " + TABLE_NAME + "(" + col_id + " INTEGER PRIMARY KEY AUTOINCREMENT," + col_name + " TEXT," + col_contact + " TEXT" + ")";

  2. 在插入ContentValues的同时添加另一个密钥：

    contentValues.put(col_id, 1);

我建议使用选项1

答案 1 :(得分：0)

请为您的getAllData方法替换以下代码。

public Cursor getAllData() {
    Cursor cursor = this.database.query(TABLE_NAME , new String[]{col_id, col_name , col_contact }, null, null, null, null, null);
    if (cursor != null) {
        cursor.moveToFirst();
    }
    return cursor;
}

更新：您的 col_id 是 INTEGER PRIMARY KEY ，并且您没有插入任何值，因此必须使用自动递增主键，方法是使用以下代码在onCreate方法中，更改后请卸载您的应用程序（由于数据库已经创建，因此您需要新的数据库，因为您是change列的属性），然后尝试一下，希望它可以工作

String sql_query = "CREATE TABLE " + TABLE_NAME + "("
            + col_id + " INTEGER PRIMARY KEY AUTOINCREMENT," + col_name + " TEXT,"
            + col_contact + " TEXT" + ")";
    sqLiteDatabase.execSQL(sql_query);
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