如何確保所選日期在數據庫中相同？

我會使用日期選擇器將DATE插入到DATABASE中。它將作爲STRING存儲在數據庫中。我的另一個步驟是檢查日期。通過這個，我的意思是我會有一個edittext和一個按鈕。在編輯文本中，它將使用datapicker選擇日期。如何確保所選日期在數據庫中相同？

點擊按鈕，它會檢查數據庫是否有日期。如果有，它會直接到另一個頁面，否則它不會提供這樣的日期。

這是我的代碼：

selection.java 

public class selection extends Activity { 


    Button newButton; 
    Button updateButton; 
    Button deleteButton; 
    Button summaryButton; 
    static EditText updateEdit; 
    private int mYear; 
    private int mMonth; 
    private int mDay; 

    static final int DATE_DIALOG_ID = 0; 




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

     updateEdit = (EditText)findViewById(R.id.updateEdit); 


     updateEdit.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v) { 
        // showDialog(DATE_DIALOG_ID); 
        DialogFragment newFragment = new DatePickerFragment(); 
        newFragment.show(getFragmentManager(), "datePicker"); 
       } 
      }); 



     newButton = (Button) findViewById(R.id.newBTN); 
     newButton.setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 

       Intent mainAct=new Intent(getApplicationContext(),MainActivity.class); 
       startActivity(mainAct); 

      } 

      }); 












     updateButton = (Button) findViewById(R.id.updateBTN); 
     updateButton.setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 

       Intent updateAct=new Intent(getApplicationContext(),update.class); 
       startActivity(updateAct); 

      } 

      }); 
















     deleteButton = (Button) findViewById(R.id.deleteBTN); 
     deleteButton.setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 

       Intent updateAct=new Intent(getApplicationContext(),update.class); 
       startActivity(updateAct); 

      } 

      }); 

     summaryButton = (Button) findViewById(R.id.summaryBTN); 
     summaryButton.setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 

       Intent summaryView=new Intent(getApplicationContext(),summary.class); 
       startActivity(summaryView); 

      } 

      }); 



     } 
    public static class DatePickerFragment extends DialogFragment 
    implements DatePickerDialog.OnDateSetListener { 

     public EditText editText; 
     DatePicker dpResult; 

    public Dialog onCreateDialog(Bundle savedInstanceState) { 
    // Use the current date as the default date in the picker 

    final Calendar c = Calendar.getInstance(); 
    int year = c.get(Calendar.YEAR); 
    int month = c.get(Calendar.MONTH); 
    int day = c.get(Calendar.DAY_OF_MONTH); 
    //return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day); 

    // Create a new instance of DatePickerDialog and return it 
    return new DatePickerDialog(getActivity(), this, year, month, day); 
    } 

    public void onDateSet(DatePicker view, int year, int month, int day) { 

     updateEdit.setText(String.valueOf(day) + "/" 
       + String.valueOf(month + 1) + "/" + String.valueOf(year)); 
     // set selected date into datepicker also 


    } 
    } 
}

DBAdapter.java

public class DBAdapter { 



    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_DATE = "date"; 
    public static final String KEY_PRICE = "fuelprice"; 
    public static final String KEY_FUEL = "fuelpump"; 
    public static final String KEY_COST = "tcost"; 
    public static final String KEY_ODM = "odometer"; 
    public static final String KEY_CON = "fcon"; 

    private static final String TAG = "DBAdapter"; 

    private static final String DATABASE_NAME = "MyDB"; 
    private static final String DATABASE_TABLE = "fuelLog"; 
    private static final int DATABASE_VERSION = 2; 



    private static final String DATABASE_CREATE = 
      "create table fuelLog (_id integer primary key autoincrement, " + "date text not null, fuelprice text not null, fuelpump text not null, tcost text not null, odometer text not null, fcon text not null);"; 


     private final Context context;  

     private DatabaseHelper DBHelper; 
     private SQLiteDatabase db; 

     public DBAdapter(Context ctx){ 
      this.context = ctx; 
      DBHelper = new DatabaseHelper(context); 
     } 

     private static class DatabaseHelper extends SQLiteOpenHelper 
     { 
      DatabaseHelper(Context context){ 
       super(context, DATABASE_NAME, null, DATABASE_VERSION); 
      } 

      public void onCreate(SQLiteDatabase db) 
      { 
       try{ 
        db.execSQL(DATABASE_CREATE);  
       }catch (SQLException e){ 
        e.printStackTrace(); 
       } 
      }//onCreate 

      public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
      { 
       Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
         + newVersion + ", which will destroy all old data"); 
       db.execSQL("DROP TABLE IF EXISTS contacts"); 
       onCreate(db); 
      }//onUpgrade 

     }//DatabaseHelper 


     public DBAdapter open() throws SQLException 
     { 
      db = DBHelper.getWritableDatabase(); 
      return this; 
     }//open 


     //---closes the database---  
     public void close() 
     { 
      DBHelper.close(); 
     }//close 


     //---insert a log into the database--- 
     public long insertLog(String date, String fuelprice, String fuelpump,String tcost,String odometer,String fcon) 
     { 
      ContentValues initialValues = new ContentValues(); 
      initialValues.put(KEY_DATE, date); 
      initialValues.put(KEY_PRICE, fuelprice); 
      initialValues.put(KEY_FUEL, fuelpump); 
      initialValues.put(KEY_COST, tcost); 
      initialValues.put(KEY_ODM, odometer); 
      initialValues.put(KEY_CON, fcon); 


      return db.insert(DATABASE_TABLE, null, initialValues); 
     }//insertLog 
     }

selection.xml

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


    <TableLayout 
     android:id="@+id/tableLayout1" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:stretchColumns="1 "> 

     <TableRow 
      android:id="@+id/tableRow1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content"> 

      <Button 
      android:id="@+id/newBTN" 
      android:text="New" 
      android:layout_width="wrap_content" 
      android:layout_height="60px" > 
     </Button> 
     </TableRow> 

     <TableRow 
      android:id="@+id/tableRow2" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" > 
      <Button 
      android:id="@+id/updateBTN" 
      android:text="Update" 
      android:layout_width="wrap_content" 
      android:layout_height="60px" > 
     </Button> 
      <EditText 
       android:id="@+id/updateEdit" 
       android:text="" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
        android:editable="false" 
       android:enabled="true"> 
      </EditText> 
     </TableRow> 
     <TableRow 
      android:id="@+id/tableRow3" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" > 
      <Button 
      android:id="@+id/deleteBTN" 
      android:text="Delete" 
      android:layout_width="wrap_content" 
      android:layout_height="60px" > 
     </Button> 
      <EditText 
       android:id="@+id/deleteEdit" 
       android:text="" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content"> 
      </EditText> 
     </TableRow> 


      <TableRow 
      android:id="@+id/tableRow4" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" > 
      <Button 
      android:id="@+id/summaryBTN" 
      android:text="Summary" 
      android:layout_width="wrap_content" 
      android:layout_height="60px" > 
     </Button> 

     </TableRow> 




     </TableLayout> 





</LinearLayout>

來源

2014-01-22 Chloe

從您的數據庫中獲取所有日期，並與您在循環中選擇的日期進行比較。插入的日期與您從日期選擇器中選擇的日期格式相同嗎？ – longwalker

可能重複的[日期比較在Android]（http://stackoverflow.com/questions/10008911/date-comparison-in-android） –

@longwalker插入字符串中的日期.. – Chloe

在DBAdapter實現方法得到的日期到一個數組或數組列表例如datesList：

public ArrayList<String> getAllDates() { 
     ArrayList<String> datesList = new ArrayList<String>(); 

     Cursor cursor = database.query(MySQLiteHelper.DATABASE_TABLE, 
       yourColumn, null, null, null, null, null); 

     cursor.moveToLast(); 
     while (!cursor.isBeforeFirst()) { 

      // I am thinking your date is located at 1 
      String date = cursor.getString(1); 
      datesList.add(date); 
      cursor.moveToPrevious(); 
     } 
     // Make sure to close the cursor 
     cursor.close(); 
     return datesList; 
    }

以及用於比較的日期，開始一個循環是這樣的：

DBAdapter adapter = new DBAdapter(); 
adapter.open(); 
ArrayList <String> datesList = adapter.getAllDates(); 
for (String d:datesList){ 
     if (d.equals(date)){ 
      // do something 

      return; 
     } 
    }

從數據庫和日期選擇器日期的方式是很重要的，如「DD/MM是很重要的/ YYYY」。希望它有幫助

來源

2014-01-22 15:41:11 longwalker

如何確保所選日期在數據庫中相同？

回答

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