I am trying to update a row in a table in an SQLite database using C++, but I want to update it relative to its current value.
This is what I have tried so far:
int val=argv[2];
string bal = "UPDATE accounts SET balance = balance + " + argv[1] + "WHERE account_id = " + bal + argv[2];
if (sqlite3_open("bank.db", &db) == SQLITE_OK)
{
sqlite3_prepare( db, balance.c_str(), -1, &stmt, NULL );//preparing the statement
sqlite3_step( stmt );//executing the statement
}
So that the first parameter is the account_id, and the second parameter is the current balance.
However, this does not work. What can I do to have the database successfully update?
Thank you!
EDIT: Sorry for the confusion. The primary situation is having a table with many entries, each with a unique account id. For example, one has an id of 1 with a balance of 5.
If I run this program with the parameters "1 5", the balance should now be 10. If I run it again with "1 7", it should be 17.
You cannot use the + operator to concatenate C-style strings and string literals. A quick and dirty fix:
string bal = string("UPDATE accounts SET balance = balance + ") + argv[1] + string( " WHERE account_id = " ) + argv[2];
Related
In Power BI Desktop i have a table from an excel file and i want to split a row based on a division between the value of a specific column and a default number.
In more details lets assume tha we have a table like this :
if the default value we want to devide column Amount is 50,then the desirable result would be something like that :
Do you have any idea how can i implement that in Power query editor or with dax?
Thanks
Tested this in Power Query for Excel, but hopefully should work for you in Power BI too. If you create a function like:
divisionToList = (numberToDivide as number, numberToDivideBy as number) as list =>
let
divisionResult = numberToDivide / numberToDivideBy,
isResultValid = (divisionResult >= 0) and (Number.Mod(divisionResult, 1) = 0),
errorIfInvalid = Error.Record("Cannot create a list with " & Text.From(divisionResult) & " items", Number.ToText(numberToDivide) & " / " & Number.ToText(numberToDivideBy) & " = " & Text.From(divisionResult), null),
listOrError = if isResultValid then List.Repeat({divisionResult}, divisionResult) else error errorIfInvalid
in listOrError,
It should divide two numbers and return a list of length d in which each element is d (d is the result of the division). This list can then, in the context of a table, be expanded into new rows.
There is some basic error handling in the function for cases where the division yields a problematic number (since you can't have a list with, for example, 5.1 elements or -1 elements). You can change/remove this handling if necessary.
I think this code below takes me from your first image to your second image -- and hopefully will give you some idea on how to go about achieving this.
let
mockData = Table.FromColumns({{200, 400}, {"A", "B"}}, type table [Amount = number, Description = text]),
defaultValue = 50, // Not sure what logic is required for arriving at this figure, so have simply assigned it.
divisionToList = (numberToDivide as number, numberToDivideBy as number) as list =>
let
divisionResult = numberToDivide / numberToDivideBy,
isResultValid = (divisionResult >= 0) and (Number.Mod(divisionResult, 1) = 0),
errorIfInvalid = Error.Record("Cannot create a list with " & Text.From(divisionResult) & " items", Number.ToText(numberToDivide) & " / " & Number.ToText(numberToDivideBy) & " = " & Text.From(divisionResult), null),
listOrError = if isResultValid then List.Repeat({divisionResult}, divisionResult) else error errorIfInvalid
in listOrError,
invokeFunction = Table.TransformColumns(mockData, {{"Amount", each divisionToList(_, defaultValue), type list}}),
expanded = Table.ExpandListColumn(invokeFunction, "Amount")
in
expanded
I don't understand whats wrong with the code, I have read a lot of times but I can't find the error
pstmt = con->prepareStatement("SELECT (?) FROM votos WHERE id = (?)");
pstmt->setString(1, eleccion);
pstmt->setInt(2, p->getId());
res = pstmt->executeQuery();
while(res->next())
{
p->setVoto(res->getInt(1));
}
When the eleccion and id variables are Provincial and 1 respectively the getInt(1) function should return 1, but it returns 0.
The command (in the mysql command line):
SELECT Provincial from Votos WHERE id=1
Returns a table with one row and one column with the value 1
Side notes:
Spelling was checked
The getId() function works correctly
The compiler doesn't give any error
You can't use a placeholder in a prepared query for a column name. It's returning the value of the string eleccion, not using it as the name of a column in the table. You need to do string concatenation to substitute the column name.
std::string sql = std::string("SELECT `") + eleccion + "` FROM votos WHERE id = ?";
pstmt = con->prepareStatement(sql.c_str());
pstmt->setInt(1, p->getId());
res = pstmt->executeQuery();
while(res->next())
{
p->setVoto(res->getInt(1));
}
If the value of eleccion is coming from the user or some other untrusted source, make sure you validate it before concatenating, to prevent SQL injection.
In Siddhi query, I am importing two stream S1 and S2. If I receive in S1 stream I will insert in event table T1, and when I receive in S2 I will update in the T1 table based on the id, and also I will send the updated values from the table into Output stream O1.
As a part of the requirement, I need to get the content which table T1, which is inserted before 5 min(ie, if a record resides more than 5 min) and send to another output stream O2.
#name('S1')
from S1
select id, srcId, 'null' as msgId, 'INP' as status
insert into StatusTable;
#name('S2')
from S2#window.time(1min) as g join StatusTable[t.status == 'INP'] as t
on ( g.srcId == t.id)
select t.id as id, g.msgId as msgId, 'CMP' as status
update StatusTable on TradeStatusTable.id == id;
#name('Publish')
from S2 as g join StatusTable[t.status == 'CMP'] as t on ( g.srcId == t.id and t.status == 'CMP')
select t.id as id, t.msgId as msgId, t.status as status
insert into O1;
How to add a query in this existing query to fetch the records from TradeStatus table, which receides more than 5 minutes. Since the table cannot be used alone, I need to join it with a stream, how to do this scenario?
String WebAttackSuccess = "" +
"#info(name = 'found_host_charged1') "+
"from ATDEventStream[ rid == 10190001 ]#window.timeBatch(10 sec) as a1 "+
"join ATDEventStream[ rid == 10180004 ]#window.time(10 sec) as a2 on a2.src_ip == a1.src_ip and a2.dst_ip == a1.dst_ip " +
" select UUID() as uuid,1007 as cid,a1.sensor_id as sensor_id,a1.interface_id as interface_id,a1.other_id as other_id,count(a1.uuid) as event_num,min(a1.timestamp) as first_seen,max(a2.timestamp) as last_seen,'' as IOC,a1.dst_ip as victim,a1.src_ip as attacker,a1.uuid as NDE4,sample:sample(a2.uuid) as Sample_NDE4 " +
" insert into found_host_charged1;"+
""+
"#info(name = 'found_host_charged2') "+
"from every a1 = found_host_charged1 " +
"-> a2 = ATDEventStream[dns_answers != ''] "+
"within 5 min "+
"select UUID() as uuid,1008 as cid,a2.sensor_id as sensor_id,a2.interface_id as interface_id,a2.other_id as other_id,count(a2.uuid) as event_num,a1.first_seen as first_seen,max(a2.timestamp) as last_seen,a2.dns_answers as IOC,a2.dst_ip as victim,a2.src_ip as attacker,a1.uuid as NDE5,sample:sample(a2.uuid) as Sample_NDE5 " +
"insert into found_host_charged2; ";
This is part of my work,i use two stream,maybe you can get the data from StatusTable in your second stream.If not yet resolved,you can change StatusTable to S1.
Hello guys i hope you could enlighten me with this issue i am facing!
Initial Output:
The sample text file is below and the format is as follow (Item Desc:Price:Quantity:Date).
STRAW:10:10:11NOV1991
BARLEY:5.10:5:19OCT1923
CHOCOLATE:50:50:11NOV1991
I am required to print out a daily summary report of the total amt of sales on that day. Based on the sample above, the result will be on 11 NOV 1991 the total amt of sales(2 items) will be 60 while on 19OCT1923 the total amt of sales(1 item) will be 5.
Desired Output:
11Nov1991 Total amt of sales:60
19Oct1923 Total amt of sales:5
My question is, how do i generate the code to show only one unique date with the total amount of sales? I have created a loop to check if that a certain year exist for testing purposes but it isn't working. I want it to be able to iterate through a file and check if a certain year exist and if it exist already, the next vector element that has the same year won't be written to a file but instead only the item price will be added. Below is the code i am trying to implement.
ifstream readReport("DailyReport.txt");
ofstream writeDailyReport("EditedDailyReport.txt");
string temp1 = "";
//Read from empty report.txt
while(getline(readReport,temp1))
{
for(int i=0; i < itemDescVec.size(); i++)
{
stringstream streamYearSS;
streamYearSS << itemDescVec[i].dateYear;
string stringYear = streamYearSS.str();
size_t found1 = temp1.find(stringYear);
//If can find year
if (found1 != string::npos )
{
cout << "Can find" << endl;
}
//If cannot find year
else if (found1 == string::npos )
{
cout << "Cannot find" << endl;
writeDailyReport << itemDescVec[i].itemDescription << ":" << itemDescVec[i].unitPrice << ":"
<< itemDescVec[i].quantity << ":" << itemDescVec[i].dateDay << "/" << itemDescVec[i].dateMonth << "/" << itemDescVec[i].dateYear
<< endl;
}
}
}
readReport.close();
writeDailyReport.close();
remove("DailyReport.txt");
rename("EditedDailyReport.txt", "DailyReport.txt");
It would be better to use your own object to store the data - then you can write, for example, salesRecord.quantity (or salesRecord.getQuantity() if you have written a getter) instead of salesrecord.at(2). This is a lot more readable and is better practice than remembering that 2 = quantity (etc.).
Now as to your actual question... I would say something like this:
Iterate over the list. For each item:
Check if the date of the item has already been added to your new list.
If the date does not already exist, simply add the item in its entireity.
If it does already exist, edit the existing item such that previousQuantity += quantityToAdd
On the sorted list
BARLEY:5.10:5:19OCT1923
STRAW:10:10:11NOV1991
CHOCOLATE:50:50:11NOV1991
this would work as follows:
Try to add barley data - nothing for that date so far, so add it:
19OCT1923 - 5 units
Try to add strawberry data - nothing for that date so far, so add it:
19OCT1923 - 5 units
11NOV1991 - 10 units
Try to add chocolate data - 11NOV1991 already exists, so add 50 to the 10 that's already there:
19OCT1923 - 5 units
11NOV1991 - 60 units
I have been struggling with this piece of code. Everything is being updated except my items table in the database. Need the sales part to be plus 1 each time someone makes a purchase.
$setQuery = '';
if($extended) {
$setQuery = " `status` = 'extended_buy', ";
}
$mysql->query("
UPDATE `items`
SET `sales` = `sales` + 1,
$setQuery
`earning` = `earning` + '".sql_quote($price)."'
WHERE `id` = '".intval($item['id'])."'
");
return true;
}
You will need to use Subquery for the same
It would be somewhat like this
SET sales = (From items where WHERE id = '".intval($item['id']) + 1,
You will need to pull its value and then Add it.
In other case you can pick it in variable and update it.