java.lang.IllegalArgumentException：如果列'_id'不存在 [英] java.lang.IllegalArgumentException: column '_id' does not exist

问题描述

我想调试我在真实设备上的应用程序，并有一个错误。但在模拟器中进行测试时，错误没有露面。以下是错误：

I'm trying to debug my application on a real device and having an error. But when testing on emulator, the error didn't show up. Here is the error:

ERROR / AndroidRuntime（981）：产生的原因：   java.lang.IllegalArgumentException异常：   列'_id'不存在

ERROR/AndroidRuntime(981): Caused by: java.lang.IllegalArgumentException: column '_id' does not exist

的误差给出的以下code中的最后一行。这是在活动。

The error is given in the last line of the following code. This is in the Activity.

adapter = new SimpleCursorAdapter(this, R.layout.list_item, c, new String[] {   
            DataHandlerDB.CONTACT_NAME_COL,
            DataHandlerDB.CONTACT_NUMBER_COL,
            DataHandlerDB.CONTACT_DURATION_COL,
            DataHandlerDB.CONTACT_DATE_COL }, new int[] {
            R.id.contact_name, R.id.phone_number, R.id.duration, R.id.date });

下面是我的活动：

public class MyActivity extends Activity {

    private static final String LOG_TAG = "MyActivity";
    private ListView listview;
    private SimpleCursorAdapter adapter;        
    private DataHandlerDB handler;
    private SQLiteDatabase db;
    private OpenHelper helper;
    private Cursor c;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);     
        setContentView(R.layout.main);

        helper = new OpenHelper(this);
        db = helper.getWritableDatabase();
        helper.onCreate(db);
        setBasicContent();
        c.close();
    }   


    @Override
    public void onDestroy(){

        super.onDestroy();
        DataHandlerDB.makeTheSelection(this).close();
        db.close();
        helper.close();

    }

    @Override
    public void onPause(){

        super.onPause();
        DataHandlerDB.makeTheSelection(this).close();
        db.close();
        helper.close();

    }

    @Override
    public void onStop(){

        super.onStop();
        DataHandlerDB.makeTheSelection(this).close();
        db.close();
        helper.close();

    }


    @Override
    protected void onResume(){

        super.onResume();
        setBasicContent();

    }   

    public void setBasicContent() {

        listview = (ListView) findViewById(R.id.list_view); 

        Log.i(LOG_TAG, "listview " + listview);

        c = DataHandlerDB.makeTheSelection(this);

        c.moveToFirst();

        if(db.isOpen())
            Log.i(LOG_TAG, "db is opened");

        Log.i(LOG_TAG, "cursor: " + c.getCount());

        startManagingCursor(c);

        adapter = new SimpleCursorAdapter(this, R.layout.list_item, c, new String[] {   
                DataHandlerDB.CONTACT_NAME_COL,
                DataHandlerDB.CONTACT_NUMBER_COL,
                DataHandlerDB.CONTACT_DURATION_COL,
                DataHandlerDB.CONTACT_DATE_COL }, new int[] {
                R.id.contact_name, R.id.phone_number, R.id.duration, R.id.date });

        Log.i(LOG_TAG, "before setAdapter");
        Toast.makeText(this, "Before setAdapter", Toast.LENGTH_SHORT).show();

        listview.setAdapter(adapter);

        db.close();

        if(db.isOpen()){

            Log.i(LOG_TAG, "db is opened.");

        }

        if(!c.isClosed()){

            Log.i(LOG_TAG, "cursor is opened");

        }           
    }       
}

这是查询并返回游标的方法是在类 DataHandlerDB 。

The method that query and return the cursor is in the class DataHandlerDB.

public class DataHandlerDB {

private static final String DATABASE_NAME = "calls.db";
private static final int DATABASE_VERSION = 1;

protected static String CONTACT_NAME_COL = "contact_name";
protected static String CONTACT_NUMBER_COL = "contact_number";
protected static String CONTACT_DURATION_COL = "duration";
protected static String CONTACT_DATE_COL = "date";
protected static String CONTACT_MONTH_COL = "month";

// create the DB
public static SQLiteDatabase createDB(Context ctx) {
    OpenHelper helper = new OpenHelper(ctx);
    SQLiteDatabase db = helper.getWritableDatabase();
    helper.onCreate(db);
    helper.onOpen(db);
    db.close();
    return db;
}

public static Cursor makeTheSelection(Context ctx) {

    OpenHelper helper = new OpenHelper(ctx);
    SQLiteDatabase db = helper.getWritableDatabase();

    Cursor cursor = db.query(TABLE_NAME_2, null, null, null, null, null,
            "duration desc");

    cursor.moveToFirst();
    db.close();

    return cursor;
}
    // class OpenHelper
public static class OpenHelper extends SQLiteOpenHelper {

    private final Context mContext;

    OpenHelper(Context context) {

        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        this.mContext = context;

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        Log.i(LOG_TAG, "entrou no onCreate");
        String[] sql = mContext.getString(
                R.string.MyAppDatabase_OnCreate).split("\n");

        db.beginTransaction();

        try {
            execMultipleSQL(db, sql);
            db.setTransactionSuccessful();
        } catch (SQLException e) {

            Log.e("Error creating tables and debug data", e.toString());
            throw e;

        } finally {
            db.endTransaction();

        }
    }

    private void execMultipleSQL(SQLiteDatabase db, String[] sql) {

        for (String s : sql) {

            if (s.trim().length() > 0) {

                db.execSQL(s);
            }
        }

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

         Log.w("MyDB Database",
         "Upgrading database, this will drop tables and recreate.");
         db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); onCreate(db);

    }

    @Override
    public void onOpen(SQLiteDatabase db) {

        super.onOpen(db);
    }
}
}

下面是使用SQL命令的XML文件。

Here is the xml file with the sql command.

<string name="MyAppDatabase_OnCreate">
    "CREATE TABLE IF NOT EXISTS contact_data(_id INTEGER PRIMARY KEY AUTOINCREMENT, contact_id INTEGER, contact_name VARCHAR(50), number_type VARCHAR(50), contact_number VARCHAR(50), duration TIME, duration_sum TIME, date DATE, current_time TIME, cont INTEGER, type VARCHAR, month VARCHAR(50), day VARCHAR(50), year VARCHAR(50));"
</string>

从我的角度来看，我觉得开始的时候它的应用程序不创建数据库。因为，它可以找到列 _id ，但它明确地写在XML code与 _id 列。我认为，这也是因为我已经明确地写在列的选择方法，包括 _id 。我不喜欢这样的：

From my point of view, I think the application is not creating the db when starting it. Because, it can find the column _id, but it is explicity written in the xml code to create it with the _id column. And I think that also because I've explicity written the columns in the select method, including the _id. I did like this:

Cursor cursor = db.query(TABLE_NAME_2, 
                new String[]{
                "_id", 
                "contact_id", 
                "contact_name", 
                "number_type", 
                "contact_number", 
                "duration", 
                "duration_sum", 
                "date", 
                "current_time", 
                "cont", "type", 
                "month", 
                "day", 
                "year"}, null, null, null, null,
                "duration desc");

和附带于该情况下的错误是几乎相同的：

And the error that comes for this case is almost the same:

引起的：   android.database.sqlite.SQLiteException：   没有这样的列：_id：，而   编译：选择_id，CONTACT_ID，   CONTACT_NAME，NUMBER_TYPE，   contact_number，持续时间，   duration_sum，日期，CURRENT_TIME，   续，类型，月，日，一年   contact_data ORDER BY时间递减

Caused by: android.database.sqlite.SQLiteException: no such column: _id: , while compiling: SELECT _id, contact_id, contact_name, number_type, contact_number, duration, duration_sum, date, current_time, cont, type, month, day, year FROM contact_data ORDER BY duration desc

任何人有任何解决方案？我不知道为什么我测试模拟器错误没有显示了，但在真正的设备它发生了。

Anyone has any solution?? I dont know why I tested it on emulator the error didnt show up, but in a real device it happened.

更新

我刚刚登录这样的数据库

I just logged the first column of the database like this

Log.i(LOG_TAG, "Cursor(0)" + cursor.getColumnName(0));

和它印 ID 不是 _id 。但正如你所看到的恰好有 _id 写在声明中。

and it printed id not _id. But as you can see there is exactly _id written in the statement.

在此先感谢。

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