I am trying to insert into my SQL database using QT. I have been successful with other SQL commands like delete. But here Nothing is added to my database. I am wondering if maybe there is a syntax error somewhere.
QSqlQuery task;
task.prepare("insert or replace into animals(name, type, breed, gender, age, lifespan, noise, intelligence, adaptability, personality, diet, environment, pastOwners, timeDedication, costDedication, medication, reproductability, appetite, energyLevel, weight, height) values ('" + name + "', '" + type + "','" + breed + "','" + gender + "', " + age + ", " + lifespan + ", " + noise + ", " + intelligence + ", " + adaptability + " ,'" + personality + "', '" + diet + "', '" + environment + "', " + pastOwners + ", " + timeDedication + ", " + costDedication + ", " + medication + ", " + reproductability + ", '" + appetite + "', " + energyLevel + ", " + weight + ", " + height + ");");
task.exec();
For prepared query you need write something like this:
QSqlQuery query;
query.prepare("INSERT INTO person (id, forename, surname) "
"VALUES (:id, :forename, :surname)");
query.bindValue(":id", 1001);
query.bindValue(":forename", "Bart");
query.bindValue(":surname", "Simpson");
query.exec();
Binding values will help avoid sql injection.
Related
I am creating two tables with the following queries. Based on the region, the number of columns might be different and some columns might not be used for some regions.
String currentTableQuery = "CREATE TABLE \"" + currentTable + "\" \n" +
"AS \n" +
"SELECT " + columns + "\n" +
"FROM \"" + region + "\" \n" +
"WHERE partition_0=\'" + date + "\' AND partition_1=\'" + table + "\';";
Columns is an array:
String[] columns = new String[]{"col0", "col1", "col2", "col3", "col4", ...
Previous table:
String previousTableQuery = "CREATE TABLE \"" + previousTable + "\" \n" +
"AS \n" +
"SELECT " + columns + "\n" +
"FROM \"" + region + "\" \n" +
"WHERE partition_0=\'" + previousDate + "\' AND partition_1=\'" + table + "\';";
And after this, I am creating a delta table like below:
String deltaProcessingQuery =
"CREATE TABLE " + deltaTable + "\n" +
"WITH (\n" +
"format = 'TEXTFILE', \n" +
"field_delimiter = '\\t', \n" +
"write_compression = 'NONE', \n" +
"external_location = \'" + uploadLocation + "\' \n" +
")" + "\n" +
"AS" + "\n" +
"SELECT * FROM \"" + currentTable + "\" \n" +
"EXCEPT" + "\n" +
"SELECT * FROM \"" + previousTable + "\" ;";
But in the final delta table, columns which do not have data (or are extra columns) are backfilled with garbage data: \N. I am not sure where this data (\N) is coming from. How can I change that to be empty data?
I'm trying to parse date time from a PNG file but can't quite get it with QRegExp
this_png_20211208_1916.png
QDateTime Product::GetObstime()
{
QDateTime obstime;
QString filename = FLAGS_file_name.c_str();
QString year, month, day, hour, minute, second;
QRegExp regexp = QRegExp("^.*\\w+_(\\d{4}\\d{2}\\d{2})_(\\d{2}\\d{2})\\.png$");
VLOG(3) << " filename: " << filename.toStdString();
if(regexp.indexIn(filename) !=-1)
{
VLOG(3) << " filename: " << filename.toStdString();
QStringList dt_bits = regexp.capturedTexts();
if(dt_bits.size() >=2)
{
year = dt_bits.at(1).mid(0, 4);
month = dt_bits.at(1).mid(5, 2);
day = dt_bits.at(1).mid(8, 2);
hour = dt_bits.at(2).mid(0, 2);
minute = dt_bits.at(2).mid(3, 2);
second = dt_bits.at(2).mid(3, 2);
VLOG(3) << " Year: " << year.toStdString()
<< " Month: " << month.toStdString()
<< " Day: " << day.toStdString()
<< " Hour: " << hour.toStdString()
<< " Min: " << minute.toStdString()
<< " Sec: " << second.toStdString();
QString datetime_str = year + "-" + month + "-" + day +
"T" + hour + ":" + minute + second + "00Z";
obstime = QDateTime::fromString(datetime_str, Qt::ISODate);
if (obstime.isValid())
{
VLOG(3)<<"Date iS VALID: "<<obstime.toString(Qt::ISODate).toStdString();
}
else
{
LOG(ERROR)<<" Error! Date Time bits did not match format.";
}
}
}
return obstime;
}
been using tools like https://regex101.com/
but to no avail. am I missing something?
You have the following errors in your code:
month = dt_bits.at(1).mid(5, 2); should be month = dt_bits.at(1).mid(4, 2); because the index is 0-based, not 1-based
day = dt_bits.at(1).mid(8, 2); should be day = dt_bits.at(1).mid(6, 2);
minute = dt_bits.at(2).mid(3, 2); should be minute = dt_bits.at(2).mid(2, 2);
second = dt_bits.at(2).mid(3, 2); should be second = "00"; because your filenames do not contain seconds
Generally I would recommend doing all of the work in the regex instead of doing some fancy splitting using QString::mid():
QRegExp regexp = QRegExp("^.*\\w+_(\\d{4})(\\d{2})(\\d{2})_(\\d{2})(\\d{2})\\.png$");
This gives you all the fields in separate groupings, no need for QString::mid() at all.
This question already has answers here:
How to concatenate a std::string and an int
(25 answers)
Closed 1 year ago.
#include <iostream>
#include <vector>
#include <string>
std::string likes(const std::vector<std::string> &names)
{
if (names.size() == 0)
return "no one likes this";
else if (names.size() == 1)
return names[0] + " likes this";
else if (names.size() == 2)
return names[0] + " and " + names[1] + " like this";
else if (names.size() == 3)
return names[0] + ", " + names[1] + " and " + names[2] + " like this";
else if(names.size() > 3)
return names[0] + ", " + names[1] + " and " + (names.size()-2) + " others like this"; /*this line isn't working, i guess the problem is in names.size() */
The last line is causing my application to not run, i have tried every possible way i know to solve this but nothing really helped, can you please help?
you can't concatenate a str with an int/float
corrected code:
#include <iostream>
#include <vector>
#include <string>
std::string likes(const std::vector<std::string> &names)
{
if (names.size() == 0)
return "no one likes this";
else if (names.size() == 1)
return names[0] + " likes this";
else if (names.size() == 2)
return names[0] + " and " + names[1] + " like this";
else if (names.size() == 3)
return names[0] + ", " + names[1] + " and " + names[2] + " like this";
else if(names.size() > 3)
return names[0] + ", " + names[1] + " and " + std::to_string(names.size()-2) + " others like this";
CLICK HERE TO SEE THE IMAGE PROBLEM
C++ - I'm having a big problem with my code and I don't understand where I did the mistake because I'm not getting the result that I want for example the 1st output that problem is asking me :(
My FULL CODE
Outputs that I'm getting wrong
#include <iostream>
#include <string>
using namespace std;
int main() {
string firstName, middleName, lastName, theName;
getline(cin, theName);
int findN = theName.find(" ");
firstName = theName.substr(0, findN);
int findN2 = theName.find(" ", findN + 1);
if (findN2 != string::npos){
middleName = theName.substr(findN2 + 1, findN2 - findN - 1);
lastName = theName.substr(findN2 + 1, theName.length() - findN2 - 1);
cout << lastName << ", " << firstName[0] << "." << middleName[0] << "." << endl;
}
else {
lastName = theName.substr(findN + 1, theName.length() - findN - 1);
cout << lastName << ", " << firstName[0] << " . " << endl;
}
return 0;
}
I suggest learning to use debugger.
#include <iostream>
#include <string>
using namespace std;
int main() {
string firstName, middleName, lastName, theName;
getline(cin, theName);
int findN = theName.find(" ");
firstName = theName.substr(0, findN);
int findN2 = theName.find(" ", findN + 1);
if (findN2 != string::npos) {
//changed from findN2 + 1 to findN + 1
middleName = theName.substr(findN + 1, findN2 - findN - 1);
lastName = theName.substr(findN2 + 1, theName.length() - findN2 - 1);
cout << lastName << ", " << firstName[0] << "." << middleName[0] << "." << endl;
}
else {
lastName = theName.substr(findN + 1, theName.length() - findN - 1);
//fixed the white space " . " -> ". "
cout << lastName << ", " << firstName[0] << ". " << endl;
}
return 0;
}
This is easily solved with debugger.
If there is a second space, both of your middleName and middleName are assigned substring starting from findN2 + 1.
If there is no second space, you have extra spaces around . here: " . "
im wondering how to dynamicaly declare variable name with ionic 2.
i want to implemet a read more function with ion-list result but to do it i need to have individual variable names.
// my ts file
import { Component } from '#angular/core';
import { NavController,Platform ,LoadingController, NavParams } from 'ionic-
angular';
import { GardeService } from '../../app/services/Garde.service';
#Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class Home {
//data:any;
public newslist: Array<Object>;
mytext:any;
prewords:any;
textpreview:any;
fulltext:any;
constructor(public data:GardeService) {}
ngOnInit()
{
this.loadnews();
this.fulltext = true;
this.textpreview = false;
}
public loadnews(){
this.newslist = [];
var map: {[key:string]:string} = {};
this.data.LoadNews().subscribe(
data => {
for(let i=0;i<data.length;i++){
//this.newslist.push(data[i]);
//console.log("news",data[i].content);
this.mytext = data[i].content.split(' ');
this.prewords = this.mytext[0] + " " + this.mytext[1] + " " +
this.mytext[2] + " " + this.mytext[3] + " " +
this.mytext[4] + " " + this.mytext[5] + " " + this.mytext[6] + " " +
this.mytext[7] + " " + this.mytext[8] + " " +
this.mytext[9] + " " + this.mytext[10] + " " + this.mytext[11] + " "
+ this.mytext[12] + " " + this.mytext[13] + " " +
this.mytext[14] + " " + this.mytext[15] + " " + this.mytext[16] + ""
+ this.mytext[17] + " " + this.mytext[18] + " " +
this.mytext[19] + " " + this.mytext[20];
//map['fulltext'+i] = true;
this.textpreview = false;
this.newslist.push({poster: data[i].poster, title: data[i].title,
img:data[i].img, content:data[i].content,
pre:this.prewords});
//console.log("les mots descriptifs",this.prewords);
}
},
err => {
console.log(err);
},
() => console.log('news loaded')
);
}
public readMore(){
this.textpreview = true;
this.fulltext = false;
}
}
// my html file
ion-col width-100 text-wrap>
<p style="text-align:justify;" color="dark" ion-text>
<span ion-text [hidden]="textpreview">{{item.pre}}</span><span
ion-text (click)="readMore()">...Lire plus</span>
<span ion-text [hidden]="fulltext">{{item.content}}</span>
</p>
</ion-col>
i want to have dynamic changing this.fulltext and this.textpreview variable names in order to do that because when i click the read more link all the content of all the ion-itens extend . i only want it to happen the place i click