Question

Activity:

        public void delete(View v){
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setMessage("Are you sure you want to delete this account?")
                       .setCancelable(false)
                       .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                           public void onClick(DialogInterface dialog, int id) {
                                deleteCheque();
                           }
                       })
                       .setNegativeButton("No", new DialogInterface.OnClickListener() {
                           public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                           }
                       });
                AlertDialog alert = builder.create();
                alert.show();

            }
            public void deleteCheque(){
                try {
                    db=new databaseone(this);
                    Details dt=new Details();
                    int rows=db.delete1(dt);
                    if ( rows == 1) {
                        Toast.makeText(this, "Cheque Deleted Successfully!", Toast.LENGTH_LONG).show();
                        this.finish();
                    }
                    else
                        Toast.makeText(this, "Could not delete cheque!", Toast.LENGTH_LONG).show();


                }catch (Exception ex) {
                    Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();
                }



            }
            }

Database:

public int delete1(Details dt) {    
            sdb=this.getWritableDatabase();
            int rows = sdb.delete(TABLE_NAME, "id=?", new String[] { dt.getId()})
            sdb.close();
            return rows;
        }


Logcat :




    03-11 14:51:50.508: D/dalvikvm(384): GC_EXPLICIT freed 5844 objects / 303200 bytes in 363ms
    03-11 14:52:05.698: D/dalvikvm(412): GC_EXTERNAL_ALLOC freed 951 objects / 64736 bytes in 78ms
    03-11 14:52:20.648: V/one(412): 4

我是android的新手..我想使用警告对话框从数据库中删除所选数据..没有正常工作......任何人都可以帮助................ .................................................. .................... ................................

Answer 1

我不知道细节而且这个功能不太好。尝试改变这一点。

public Cursor delete1(Details dt) { 
        sdb=this.getWritableDatabase();
        int rows = sdb.delete(TABLE_NAME, "id=?", new String[] { dt.getId() }); //Where is id?
        return rows;
    }

Answer 2

你应该使用详细信息类的id，它在详细信息表中用作主键。

我认为id在Detail类中。检查详细类中的id。获得ID后，您可以使用

public int delete1(Details dt) { 
    sdb=this.getWritableDatabase();
    int rows = sdb.delete(TABLE_NAME, "id=?", new String[] { dt.<id of detail class>});
     sdb.close();
    return rows;
}

从数据库中删除所选数据

2 个答案: