Question

这个代码在一个表格中正常工作....并附加了文件现在我要创建两个表，第一个活动是在table1中插入数据...但是第二个活动没有插入数据....没有日志消息........在调用attach时它给出了下面给出的日志：

      E/SQLiteLog: (1)

我的数据库类是

public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME="GEOTAG.db";
public static final String TABLE_NAME1="Coordinates_table";
public static final String TABLE_NAME2="Form1_table";
public static final String CoL_1="ID";
public static final String CoL_2="LATITUDE";
public static final String CoL_3="LONGITUDE";
public static final String CoL_4="IDForm1";
public static final String CoL_5="Residence";
public static final String CoL_6="Gender";
public static final int DATABASE_VERSION = 3;
public static Context c;
Intent intent =null,chooser=null;
File file =null;
String myFile="Data";
String fpath;
String fileName;
FileOutputStream fileOutputStream=null;

public DatabaseHelper(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
    c=context;

}

@Override
public void onCreate(SQLiteDatabase db) {
    try {
        db.execSQL("CREATE TABLE " + TABLE_NAME1 + " (" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 +" TEXT,"+ CoL_3 +" TEXT)");
        db.execSQL("CREATE TABLE " + TABLE_NAME2 + " (" + CoL_4 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_5 +" NTEXT,"+ CoL_6 +" NTEXT)");
    } catch (SQLException e) {
        Log.e("HEY","Error creating");
        e.printStackTrace();
    }

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    try{
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME1);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME2);
    onCreate(db);}
    catch (SQLException e){
        e.printStackTrace();
    }

}




public boolean insertData (String lat,String lng){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues =new ContentValues();
    contentValues.put(CoL_2,lat);
    contentValues.put(CoL_3,lng);

    long res =db.insert(TABLE_NAME1,null,contentValues);
    db.close();
    return res != -1;



}

public boolean insertForm1 (String a,String b){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues =new ContentValues();
    contentValues.put(CoL_5,a);
    contentValues.put(CoL_6,b);


    long res =db.insert(TABLE_NAME2,null,contentValues);
    db.close();
    return res != -1;



}


public void Attach()
{
    int id ;
    String latitude ;
    String longitude ;
    String residence ;
    String gender ;
    SQLiteDatabase db =this.getWritableDatabase();
    String[] columns={CoL_1, CoL_2, CoL_3,CoL_5,CoL_6};
    Cursor cursor1,cursor2;
    cursor1 = db.query(TABLE_NAME1,columns,null,null,null,null,null);
    cursor2 = db.query(TABLE_NAME2,columns,null,null,null,null,null);

    fileName= myFile+"." +"txt";
   // writing file on external storage
    try {
        File sdCard = Environment.getExternalStorageDirectory();
        File dir = new File(sdCard.getAbsolutePath() + "/Files");
        dir.mkdirs();
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                new File(dir, children[i]).delete();
            }
        }
        file = new File(dir, fileName);
    }
    catch (Exception e){
        e.printStackTrace();
    }



    try {
        fileOutputStream = new FileOutputStream(file);
        fpath = file.toString();

    while (cursor1.moveToNext() ) {
        int index1 = cursor1.getColumnIndex(CoL_1);
        int index2 = cursor1.getColumnIndex(CoL_2);
        int index3 = cursor1.getColumnIndex(CoL_3);
        int index4 = cursor2.getColumnIndex(CoL_5);
        int index5 = cursor2.getColumnIndex(CoL_6);
        id = cursor1.getInt(index1);
        latitude = cursor1.getString(index2);
        longitude = cursor1.getString(index3);
        residence = cursor2.getString(index4);
        gender = cursor2.getString(index5);


            String text1 = Integer.toString(id) + " ";
            String text2 = latitude + " ";
            String text3 = longitude + " ";
            String text4 = residence + " ";
            String text5 = gender + "\n";

            fileOutputStream.write(text1.getBytes());
            fileOutputStream.write(text2.getBytes());
            fileOutputStream.write(text3.getBytes());
            fileOutputStream.write(text4.getBytes());
            fileOutputStream.write(text5.getBytes());




        Toast.makeText(c,"Wait while the file is being attached", Toast.LENGTH_LONG).show();


    }
        Toast.makeText(c,"Ready to Send", Toast.LENGTH_LONG).show();

        fileOutputStream.flush();
        fileOutputStream.close();
    } catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        fileOutputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}





}


public void SendData(){
    if(fpath!= null) {
    File targetFile = new File(fpath);
    Uri docUri = Uri.fromFile(targetFile);
        intent = new Intent(Intent.ACTION_SEND);
        intent.putExtra(Intent.EXTRA_STREAM, docUri);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_TEXT, "Attached Data.txt");
        chooser = Intent.createChooser(intent, "Send Email....");
        c.startActivity(chooser);
    }
    else
    {
        Toast.makeText(c,"Please attach file before Sending", Toast.LENGTH_LONG).show();
    }
}


public void reset(){
    SQLiteDatabase db =this.getWritableDatabase();
    db.delete(TABLE_NAME1,null,null);
    db.delete(TABLE_NAME2,null,null);
    Toast.makeText(c,"Resetting Database", Toast.LENGTH_LONG).show();



}

}

我想从8个不同的表中保存8个不同活动的数据，最后读取数据库并通过文本文件发送...还有其他方法吗？。

我已经尝试过，我创建了一个包含5个cloumns的表...第一个活动是在前3列插入数据，第二个活动是在第4和第5列插入数据........但它创建了两行，第一行有最后两列空值，第二行有前三列空值.....我想要一行而不是两行

Answer 1

当您将数据插入同一行时，您应该更新行而不是再次调用insert。例如： -

 ContentValues cv = new ContentValues();
cv.put("Field1","value"); //These Fields should be your String values of

然后调用update而不是insert

myDB.update(TableName, cv, "_id="+id, null);

你可以refer this

Answer 2

现在工作正常

  public boolean update(String Res, String Gen){ SQLiteDatabase db = 
     this.getWritableDatabase(); ContentValues contentValues =new 
  ContentValues(); contentValues.put(CoL_4,Res); contentValues.put(CoL_5,Gen); 
 db.update(TABLE_NAME,contentValues, "Residence = ?",new String[] { "A" }); 
 return true; }

Sqlite没有在第二个表中插入数据

2 个答案: