I have the below code where I am using nested cursors. Both of them are not null but I am getting error
"android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0" on the inner cursor.
Cursor cursor3 = null;
Cursor cursor2 = db.getAllFriendsChat();
cursor2.moveToFirst();
while (!cursor2.isAfterLast()) {
String number = cursor2.getString(cursor2.getColumnIndexOrThrow(ChatModel.COLUMN_CHAT_SENT_TO));
cursor3 = db.getName(number);
String name = cursor3.getString(cursor3.getColumnIndexOrThrow(db.KEY_NAME));
db.insertList(name, number);
cursor3.close();
cursor2.moveToNext();
}
cursor2.close();
getName() Method:
public Cursor getName(String phone) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor c = db.rawQuery("select * from " + TABLE_STUDENTS + " where phone_number = " + phone, null);
if (c != null) {
c.moveToFirst(); //***I see that this statement is executed.***
}
return c;
}
I am unable to understand where I am doing mistake. Is there a different way to handle nested cursors in sqlite db. Pls help.
Thanks !
rawQuery() never returns null.
To test whether a cursor is empty, you have to check whether moveToFirst() succeeds, or call isAfterLast().
Related
OK I have a app that has a Listview and uses sqlite data to populate it. But I also want to be able to email the contents of each view for the body of the message. I tried doing this with a global string variable and catching the data in the CarCursorAdapter activity in the BindView section like this:
// Update the TextViews with the attributes for the current move
vinTxtView.setText(vinStr);
dateTxtView.setText(dateStr);
mvFromTxtView.setText(mvFrom);
mvToTxtView.setText(mvTo);
MyProperties.getInstance().bodyStrGlobal = MyProperties.getInstance().bodyStrGlobal+vinStr+"-"+mvFrom+"->"+mvTo+"-"+dateStr+"\n";
And then I use that string in the email intent. But the problem is it keeps adding to this string every time the listview is populated so I get all kinds of double entries. What would be the best way to just capture this once when the email feature is selected? Or reset the string to null at some place? Maybe just read from each listview item instead of from the cursor loader? There is probably a way to just cycle through the database table but I'm getting all kinds of errors and haven't had any luck.
Found this to work. My MainActivity is very busy now, but everything works.
public String getEmailText(){
String tempStr = "";
String[] projection = {
CarEntry._ID,
CarEntry.COLUMN_CAR_VIN,
CarEntry.COLUMN_CAR_DATE,
CarEntry.COLUMN_CAR_MOVEFROM,
CarEntry.COLUMN_CAR_MOVETO};
Cursor cursor = getContentResolver().query(Uri.parse("content://gregorykraft.com.scanvin/cars"),projection,null,null,null);
if
(cursor == null || cursor.getCount() < 1) {
Toast.makeText(this, getString(R.string.error_uri),
Toast.LENGTH_SHORT).show();
return "";
}
int i = 0;
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
i++;
String s =String.valueOf(i);
String vinStr = cursor.getString(cursor.getColumnIndex(CarEntry.COLUMN_CAR_VIN));
String mvFrom = cursor.getString(cursor.getColumnIndex(CarEntry.COLUMN_CAR_MOVEFROM));
String mvTo = cursor.getString(cursor.getColumnIndex(CarEntry.COLUMN_CAR_MOVETO));
String dateStr = cursor.getString(cursor.getColumnIndex(CarEntry.COLUMN_CAR_DATE));
tempStr = tempStr+s+") "+vinStr + "-" + mvFrom + "->" + mvTo + "-" + dateStr + "\n";
cursor.moveToNext();
}
cursor.close();
}
return tempStr;
}
Gridview is not populating any data from Sqlite database while saving the data in to database. Logcat is not generating any error also.
My DB is.
public Cursor getAllRows() {
SQLiteDatabase db = this.getReadableDatabase();
//String where = null;
Cursor c = db.rawQuery("SELECT * FROM " + DATAALL_TABLE, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
Mainactivity.
public void populateListView() {
Cursor cursor = db.getAllRows();
String[] fromFieldNames = new String[] {
DBHelper.COURSES_KEY_FIELD_ID1, DBHelper.FIELD_MATERIALDESC, DBHelper.FIELD_MATERIALNUM
};
int[] toViewIDs = new int[] {
R.id.textView1, R.id.textView3, R.id.textView2
};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getBaseContext(), android.R.layout.activity_list_item, cursor, fromFieldNames, toViewIDs, 0);
GridView myList = (GridView) findViewById(R.id.gridView1);
myList.setAdapter(myCursorAdapter);
}
Post to the honorable member #MikeT advise its works fine but need alignment ,
as is
expected format
Your issue, assuming that there is data in the table, is likely that R.id.textView1 .... 3 are nothing to do with the layout passed to the SimpleCursorAdapter. i.e. Your issue is likely to do with the combination of the layout passed to the SimpleCursorAdapter and the Id's of the views passed as the to id's.
If you were to use :-
gridview = this.findViewById(R.id.gridView1);
csr = DBHelper.getAllRows();
myCursorAdapter = new SimpleCursorAdapter(
getBaseContext(),
//android.R.layout.simple_list_item_2,
android.R.layout.activity_list_item,
csr,
new String[]{
SO50674769DBHelper.COURSES_KEY_FIELD_ID1
//SO50674769DBHelper.FIELD_MATERIALDESC,
//SO50674769DBHelper.FIELD_MATERIALNUM
},
new int[]{android.R.id.text1}, //<<<< ID of the available view
0
);
gridview.setAdapter(myCursorAdapter);
Then result would be along the lines of :-
Changing to use a different stock layout and 2 fields as per :-
gridview = this.findViewById(R.id.gridView1);
csr = DBHelper.getAllRows();
myCursorAdapter = new SimpleCursorAdapter(
getBaseContext(),
android.R.layout.simple_list_item_2,
//android.R.layout.activity_list_item, //<<<< Changed Layout
csr,
new String[]{
SO50674769DBHelper.COURSES_KEY_FIELD_ID1,
SO50674769DBHelper.FIELD_MATERIALDESC,
//SO50674769DBHelper.FIELD_MATERIALNUM
},
new int[]{android.R.id.text1, android.R.id.text2}, //<<<< ID's of the 2 views
0
);
gridview.setAdapter(myCursorAdapter);
Note The DatabaseHelper class is so named for my convenience.
Would result in :-
As such I suspect that you need to change the layout to a one of your own.
Additionally, as hinted at your getAllRows method is not at all ideal.
Checking for a null Cursor is useless as a Cursor returned from rawQuery will not be null. It may be empty in which case the Cursor getCount method would return 0 ().
moveToFirst is also a waste.
Simply have :-
public Cursor getAllRows() {
SQLiteDatabase db = this.getReadableDatabase();
return db.rawQuery("SELECT * FROM " + DATAALL_TABLE, null);
}
I tried to select multiple lines using selenium automation like below.
this.selectLineInTable(Locator.LOCATOR_LIST, "name", t1.getName()).
this.selectLineInTable(Locator.LOCATOR_LIST,"name",t2.getName()));
but its not working. Can anyone help me how to solve this issue?
try something like below:
Actions act = new Actions(driver);
act.keyDown(Keys.CONTROL).moveToElement(driver.findElement(By.xpath("first element to select"))).click().build().perform();
act.moveToElement(driver.findElement(By.xpath("second element to select"))).click().release().build().perform();
Actions act = new Actions(driver);
String m1 = this.selectLineInTable(Constant.LOCATOR_LIST_MOFULL, "name",psv.getName());//1st element
String m2=this.selectLineInTable(Constant.LOCATOR_LIST_MOFULL, "name",psTest.getName());// 2nd element
act.keyDown(Keys.CONTROL).moveToElement(driver.findElement(By.name(m1))).click().build().perform();
act.moveToElement(driver.findElement(By.name(m2))).click().release().build().perform();
protected String selectLineInTable(String scLocatorBody, String key, String value) throws Exception {
String scLocatorLine = this.findLineInTable(scLocatorBody, key, value);
if (scLocatorLine == null) {
// No line for key / value
this.logError("The row [" + key + "=" + value + "] does not exist", null);
} else {
// Click on the line
StringBuffer lRow = new StringBuffer();
lRow.append(scLocatorLine).append("col[fieldName=").append(key).append("]/");
this.clickOnElement(lRow.toString());
sleep(500);
}
return scLocatorLine;
}
Caused by: org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"name","selector":"scLocator=//ListGrid[ID=\"ssr_grid\"]/body/row[0]/"}
I have problem with my database row number. My table has 3 columns(ROWID,WORD,DEFINITION) and 3 row. I delete second row and then I try to query same row, my app fails. is this an autoincrement problem? what should I do?
Here is my code;
//Get that function
public String getThat(int id) {
String result= "";
String[] columns = new String[]{KEY_ROWID,KEY_WORD,KEY_DEFINITION};
Cursor c = ourDatabase.query(DB_TABLE, columns, KEY_ROWID +
"=" + id, null, null, null, null,null);
if(c!=null){
c.moveToFirst();
}
result = c.getString(c.getColumnIndex(KEY_DEFINITION));
return result;
}
//delete function
public boolean deleteRecords(long rowId){
return ourDatabase.delete(DB_TABLE, KEY_ROWID +"="+rowId,null)>0;
}
When the query doesn't match anything, a non-null Cursor is returned anyway but it doesn't contain any rows. When you try to access data from a non-existing row an exception is thrown.
Change this
if(c!=null){
c.moveToFirst();
}
result = c.getString(c.getColumnIndex(KEY_DEFINITION));
to something like
if(c.moveToFirst()){
result = c.getString(c.getColumnIndex(KEY_DEFINITION));
}
i.e. check the return value of moveTo..() and only access cursor data if the move succeeded and the cursor points to a valid row.
when I call select in other function, there is problem in line number 3.
Is it wrong?
public String[] select(int n){
db = helper.getReadableDatabase();
Cursor c = db.rawQuery("SELECT * FROM info WHERE number='" + n + "'", null);
}
The rawQuery() looks good, though usually you wouldn't quote integers as 'string literal'.
However, a non-void method must return a value and your method doesn't return anything. Add return null; to make it compile; implement a loop that builds a string array to return a non-null value.