I have to make a select statement on a database and than compare the results with a text file using only C# in Visual Studio. If the text file has a bigger value than the record in the database, the program returns the value from the text file, and if the database record has a bigger value, the program returns the value from the database. The results are added to a list being a class WynikPorownania{}. The user types in the file an index of a product and the value(in this case the value is it's availability condition).
For example:
The textfile says this:
WYR_WR_CZ1=12
VIDIS_JIMU_BOX=3
REREK_KOTEK_T=5
In the database, theses indexes are connected to an availability condition like this
WYR_WR_CZ1=-1.0000
VIDIS_JIMU_BOX=-13.0000
REREK_KOTEK_T=0.0000
Now the program should return the bigger value in a list being the WynikPorownania{} class.
For now, I managed to do this much: I took every record from the select query and put it in to a list as a class. I have a function that checks the "standysp"(availability condition) for a specified index, and I asigned the text file value to a string. I think that it could be done maybe with this "zwr" function and maybe a loop but I don't really know where to go from now on. This is my code for now:
using System;
using FirebirdSql.Data.FirebirdClient;
using System.Collections.Generic;
using System.Linq;
using System.IO;
namespace dokselect
{
class indexstan
{
public string index;
public double standysp;
}
class WynikPorownania
{
public string Indeks;
public int Ilosc;
}
class Program
{
public static void Main()
{
///////CONNECTION
string conn = "database=C:/PCBiznes/BAZA/IXION2_LOGMAG.FB;user=SYSDBA;password=masterkey;DataSource=192.168.24.112;Port=3050";
FbConnection myConnection = new FbConnection(conn);
FbDataReader myReader = null;
string sql = "select KARTOTEKA.indeks,STANMAG.standysp FROM kartoteka JOIN stanmag using(ID_KARTOTEKA);";
FbCommand myCommand = new FbCommand(sql, myConnection);
myConnection.Open();
myReader = myCommand.ExecuteReader();
///////LIST lista1
List<indexstan> lista1 = new List<indexstan>();
double standysp;
string index;
while (myReader.Read())
{
index = myReader[0].ToString();
standysp = Convert.ToDouble(myReader[1]);
lista1.Add(new indexstan { index=index, standysp=standysp });
//Console.WriteLine(myReader[0].ToString());
}
myConnection.Close();
Console.WriteLine(lista1.Count);
//RETURN STANDYSP FUNCTION
double zwr(string myIndex)
{
var result = lista1.FirstOrDefault(lista1 => lista1.index == myIndex).standysp;
return result;
}
zwr("EMPIS_DESKA_FASOLKA");
//READ FROM TXT
string path = "C:/Users/Praktykant/Documents/textdocs/dok1.txt";
string plik = File.ReadAllText(path);
//Console.WriteLine(plik);
StreamReader objReader = new StreamReader(path);
myConnection.Close();
}
}
You mean something like this?
var list = File.ReadAllLines(path).Select(line =>
{
var tokens = line.Split("=");
var index = tokens[0];
var value = int.Parse(tokens[1]);
return new WynikPorownania
{
Indeks = index,
Ilosc = (int)Math.Max(value, zwr(index).standysp)
}
}).ToList();
(Depending on the size of the file, a StreamReader would be better than ReadAllLines)
You're almost there.
Extract text file line by line, and compute bigger value
StringReader r = new StringReader(plik);
string line;
while((line = r.ReadLine()) != null)
{
string index = line.Split('=')[0];
string textValue = line.Split('=')[1];
double biggerValue = Math.Max(
zwr(index),
double.Parse(textValue);
Console.WriteLine($"{index} > {biggerValue}");
}
Related
I have a list filled with objects. I have to make a function that when given a certain value of one of the class atributes, gives back another one. In my case, when you specify the "index", the function will return "standysp"(I'm sorry if I can't explain it to well). I need to make this function work but I don't even know when to start. Here is my Code:
using System;
using FirebirdSql.Data.FirebirdClient;
using System.Collections.Generic;
namespace dokselect
{
class PozycjaMagazynowa
{
public double standysp;
public string nazwagrupy;
public string index;
public string nazwadl;
}
class Program
{
public static void Main()
{
string conn = "SECRET";
FbConnection myConnection = new FbConnection(conn);
FbDataReader myReader = null;
string sql = "select STANMAG.standysp,GRUPAKART.nazwagrupy, KARTOTEKA.indeks, kartoteka.nazwadl FROM stanmag JOIN kartoteka using(ID_KARTOTEKA) JOIN wystgrkart using(ID_KARTOTEKA) JOIN grupakart using(ID_GRUPAKART) ORDER BY nazwagrupy;";
FbCommand myCommand = new FbCommand(sql, myConnection);
myConnection.Open();
myReader = myCommand.ExecuteReader();
List<PozycjaMagazynowa> lista1 = new List<PozycjaMagazynowa>();
double standysp;
string nazwagrupy;
string index;
string nazwadl;
while (myReader.Read())
{
standysp = Convert.ToDouble(myReader[0]);
nazwagrupy = myReader[1].ToString();
index = myReader[2].ToString();
nazwadl = myReader[3].ToString();
lista1.Add(new PozycjaMagazynowa { standysp = standysp, nazwagrupy = nazwagrupy, index = index, nazwadl = nazwadl });
}
myConnection.Close();
Console.WriteLine(lista1.Count);
//LISTA DONE
void wyswietl()
{
//????????
}
}
}
}
I'm not sure you're doing it the right way.
First the List you create is not accessible to others methods.
Secund, maybe the List is not appropriate and you may use a HashSet<T> or Dictionnary with your PozycjaMagazynowa class implementing IEqualityComparer
I used this method and it worked thank you for help:
double wyswietl()
{
string myIndex="WSIP_MAT_GIM";
var result = lista1.FirstOrDefault(lista1 => lista1.index == myIndex).standysp;
Console.WriteLine(myIndex + " Zostalo zwrocone przez funkcje");
Console.WriteLine(result + " - to stan dyspozycyjny pasujacy do podanego indexu");
return result;
}
wyswietl();
I have a SQLite database that returns 1 number to
Select value from Income where symbol = "AE" and statementitem = "Revenues" and periodtype = "Annual" and yearmonth = "Dec 2019"; --1811.2
I use a bit of c# code to test this to make sure nothing is missed:
public string GetIncome(string dbFile, string symbol, string aq, string yearmonth)
{
var answer = String.Empty;
try
{
using (var con = new SQLiteConnection($"URI=file:{dbFile}"))
{
con.Open();
using var cmd = new SQLiteCommand(con)
{
CommandText = $"Select value from Income where symbol = '{symbol}' and statementitem = 'Revenues' and periodtype = '{aq}' and yearmonth = '{yearmonth}';"
};
using SQLiteDataReader dataReader = cmd.ExecuteReader();
while (dataReader.Read())
{
answer = dataReader.GetString(1);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
throw ex;
}
return answer;
}
This errors out with System.IndexOutOfRangeException : Index was outside the bounds of the array.
Whats the best way to pick up on that value please?
See official docs:
https://learn.microsoft.com/en-us/dotnet/api/microsoft.data.sqlite.sqlitedatareader.getstring?view=msdata-sqlite-3.1.0#Microsoft_Data_Sqlite_SqliteDataReader_GetString_System_Int32_
It tells that GetString only argument is "The zero-based column ordinal". In your case you're trying to access second item (by index 1), but your query has only single field returned. Use index 0 in
answer = dataReader.GetString(0);
I am using MySQLClient with a local database. I wrote a method which returns a list of data about the user, where I specify the columns I want the data from and it generates the query dynamically.
However, the reader is only returning the column names rather than the actual data and I don't know why, since the same method works previously in the program when the user is logging in.
I am using parameterised queries to protect from SQL injection.
Here is my code. I have removed parts which are unrelated to the problem, but i can give full code if needed.
namespace Library_application
{
class MainProgram
{
public static Int32 user_id;
static void Main()
{
MySqlConnection conn = LoginProgram.Start();
//this is the login process and works perfectly fine so i won't show its code
if (conn != null)
{
//this is where things start to break
NewUser(conn);
}
Console.ReadLine();
}
static void NewUser(MySqlConnection conn)
{
//three types of users, currently only using student
string query = "SELECT user_role FROM Users WHERE user_id=#user_id";
Dictionary<string, string> vars = new Dictionary<string, string>
{
["#user_id"] = user_id.ToString()
};
MySqlDataReader reader = SQLControler.SqlQuery(conn, query, vars, 0);
if (reader.Read())
{
string user_role = reader["user_role"].ToString();
reader.Close();
//this works fine and it correctly identifies the role and creates a student
Student user = new Student(conn, user_id);
//later i will add the logic to detect and create the other users but i just need this to work first
}
else
{
throw new Exception($"no user_role for user_id - {user_id}");
}
}
}
class SQLControler
{
public static MySqlDataReader SqlQuery(MySqlConnection conn, string query, Dictionary<string, string> vars, int type)
{
MySqlCommand cmd = new MySqlCommand(query, conn);
int count = vars.Count();
MySqlParameter[] param = new MySqlParameter[count];
//adds the parameters to the command
for (int i = 0; i < count; i++)
{
string key = vars.ElementAt(i).Key;
param[i] = new MySqlParameter(key, vars[key]);
cmd.Parameters.Add(param[i]);
}
//runs this one
if (type == 0)
{
Console.WriteLine("------------------------------------");
return cmd.ExecuteReader();
//returns the reader so i can get the data later and keep this reusable
}
else if (type == 1)
{
cmd.ExecuteNonQuery();
return null;
}
else
{
throw new Exception("incorrect type value");
}
}
}
class User
{
public List<string> GetValues(MySqlConnection conn, List<string> vals, int user_id)
{
Dictionary<string, string> vars = new Dictionary<string, string> { };
//------------------------------------------------------------------------------------
//this section is generating the query and parameters
//using parameters to protect against sql injection, i know that it ins't essential in this scenario
//but it will be later, so if i fix it by simply removing the parameterisation then im just kicking the problem down the road
string args = "";
for (int i = 0; i < vals.Count(); i++)
{
args = args + "#" + vals[i];
vars.Add("#" + vals[i], vals[i]);
if ((i + 1) != vals.Count())
{
args = args + ", ";
}
}
string query = "SELECT " + args + " FROM Users WHERE user_id = #user_id";
Console.WriteLine(query);
vars.Add("#user_id", user_id.ToString());
//-------------------------------------------------------------------------------------
//sends the connection, query, parameters, and query type (0 means i use a reader (select), 1 means i use non query (delete etc..))
MySqlDataReader reader = SQLControler.SqlQuery(conn, query, vars, 0);
List<string> return_vals = new List<string>();
if (reader.Read())
{
//loops through the reader and adds the value to list
for (int i = 0; i < vals.Count(); i++)
{
//vals is a list of column names in the ame order they will be returned
//i think this is where it's breaking but im not certain
return_vals.Add(reader[vals[i]].ToString());
}
reader.Close();
return return_vals;
}
else
{
throw new Exception("no data");
}
}
}
class Student : User
{
public Student(MySqlConnection conn, int user_id)
{
Console.WriteLine("student created");
//list of the data i want to retrieve from the db
//must be the column names
List<string> vals = new List<string> { "user_forename", "user_surname", "user_role", "user_status"};
//should return a list with the values in the specified columns from the user with the matching id
List<string> return_vals = base.GetValues(conn, vals, user_id);
//for some reason i am getting back the column names rather than the values in the fields
foreach(var v in return_vals)
{
Console.WriteLine(v);
}
}
}
What i have tried:
- Using getstring
- Using index rather than column names
- Specifying a specific column name
- Using while (reader.Read)
- Requesting different number of columns
I have used this method during the login section and it works perfectly there (code below). I can't figure out why it doesnt work here (code above) aswell.
static Boolean Login(MySqlConnection conn)
{
Console.Write("Username: ");
string username = Console.ReadLine();
Console.Write("Password: ");
string password = Console.ReadLine();
string query = "SELECT user_id, username, password FROM Users WHERE username=#username";
Dictionary<string, string> vars = new Dictionary<string, string>
{
["#username"] = username
};
MySqlDataReader reader = SQLControler.SqlQuery(conn, query, vars, 0);
Boolean valid_login = ValidLogin(reader, password);
return (valid_login);
}
static Boolean ValidLogin(MySqlDataReader reader, string password)
{
Boolean return_val;
if (reader.Read())
{
//currently just returns the password as is, I will implement the hashing later
password = PasswordHash(password);
if (password == reader["password"].ToString())
{
MainProgram.user_id = Convert.ToInt32(reader["user_id"]);
return_val = true;
}
else
{
return_val = false;
}
}
else
{
return_val = false;
}
reader.Close();
return return_val;
}
The problem is here:
string args = "";
for (int i = 0; i < vals.Count(); i++)
{
args = args + "#" + vals[i];
vars.Add("#" + vals[i], vals[i]);
// ...
}
string query = "SELECT " + args + " FROM Users WHERE user_id = #user_id";
This builds a query that looks like:
SELECT #user_forename, #user_surname, #user_role, #user_status FROM Users WHERE user_id = #user_id;
Meanwhile, vars.Add("#" + vals[i], vals[i]); ends up mapping #user_forename to "user_forename" in the MySqlParameterCollection for the query. Your query ends up selecting the (constant) value of those parameters for each row in the database.
The solution is:
Don't prepend # to the column names you're selecting.
Don't add the column names as variables to the query.
You can do this by replacing that whole loop with:
string args = string.Join(", ", vals);
I have a table and one of the column is YesNo which is of type varchar(3). I have two radio buttons in my PDF file which is in an array:
pg1rb (radio group field)
--> c1 (radio button one (yes))
--> c2 (radio button two (no))
I set textboxes like this in my code:
formFieldMap["topmostSubform[0].Page1[0].f1_01_0_[0]"] = reader.GetValue(0).ToString();
How can I select YES or NO radio button based on the row value?
Can I do something like this:
formFieldMap["pg1rb"] = reader.GetBoolean(10); //10 is the 9th column which is Yes/No value
Or do I get the value and based on it select the radio button, something like this:
if (reader.GetValue(10).ToString() == "Yes") {
formFieldMap["pg1rb"][c1] = "1";
else {
formFieldMap["pg1rb"][c2] = "1";
}
My SQL table:
I am trying to follow this site: Website example
My function that actually does the conversion:
public void writeData(string k, string c)
{
Conn = new SqlConnection(cString);
Conn.Open();
//MessageBox.Show(k);
//MessageBox.Show(c);
var pdfPath = Path.Combine(Server.MapPath("~/PDFTemplates/forme.pdf"));
// Get the form fields for this PDF and fill them in!
var formFieldMap = PDFHelper.GetFormFieldNames(pdfPath);
//if more than multiple entries, verify by name and the last four ssn
sqlCode = "SELECT * FROM [DSPCONTENT01].[dbo].[TablePDFTest] WHERE [name] = '" + k + "' AND [ssn3] = " + c + "";
//sqlCode = "SELECT * FROM [DSPCONTENT01].[dbo].[TablePDFTest] WHERE [name] = #name2 AND [ssn3] = #ssnnum";
//MessageBox.Show("" + sqlCode.ToString());
using (SqlCommand command = new SqlCommand(sqlCode, Conn))
{
command.CommandType = CommandType.Text;
//command.Parameters.AddWithValue("name2", k);
//command.Parameters.AddWithValue("ssnnum", c);
using (reader = command.ExecuteReader())
{
if (reader.HasRows)
{
if (reader.Read())
{
//MessageBox.Show(reader.GetValue(0).ToString());
/*formFieldMap["topmostSubform[0].Page1[0].f1_01_0_[0]"] = reader.GetValue(0).ToString();
formFieldMap["topmostSubform[0].Page1[0].f1_02_0_[0]"] = reader.GetValue(1).ToString();
formFieldMap["topmostSubform[0].Page1[0].f1_04_0_[0]"] = reader.GetValue(2).ToString();
formFieldMap["topmostSubform[0].Page1[0].f1_05_0_[0]"] = reader.GetValue(3).ToString();
formFieldMap["topmostSubform[0].Page1[0].f1_07_0_[0]"] = reader.GetValue(4).ToString();
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField1[0]"] = reader.GetValue(5).ToString();
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[0]"] = reader.GetValue(6).ToString();
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[1]"] = reader.GetValue(7).ToString();
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[2]"] = reader.GetValue(8).ToString();
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[3]"] = reader.GetValue(9).ToString();*/
if (reader.GetValue(10).ToString() == "Yes")
{
//MessageBox.Show("YES");
}
else if (reader.GetValue(10).ToString() == "No")
{
//MessageBox.Show("NO");
}
}
}
}
}
// Requester's name and address (hard-coded)
formFieldMap["topmostSubform[0].Page1[0].f1_06_0_[0]"] = "Medical Group\n12 Westchester Ave\nPurchase, NY 10121";
var pdfContents = PDFHelper.GeneratePDF(pdfPath, formFieldMap);
PDFHelper.ReturnPDF(pdfContents, "Completed-W9.pdf");
}
The PDFHelper class:
using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Web;
using System.IO;
using iTextSharp.text.pdf;
public class PDFHelper
{
public static Dictionary<string, string> GetFormFieldNames(string pdfPath)
{
var fields = new Dictionary<string, string>();
var reader = new PdfReader(pdfPath);
foreach (DictionaryEntry entry in reader.AcroFields.Fields)
fields.Add(entry.Key.ToString(), string.Empty);
reader.Close();
return fields;
}
public static byte[] GeneratePDF(string pdfPath, Dictionary<string, string> formFieldMap)
{
var output = new MemoryStream();
var reader = new PdfReader(pdfPath);
var stamper = new PdfStamper(reader, output);
var formFields = stamper.AcroFields;
foreach (var fieldName in formFieldMap.Keys)
formFields.SetField(fieldName, formFieldMap[fieldName]);
stamper.FormFlattening = false;
stamper.Close();
reader.Close();
return output.ToArray();
}
// See http://stackoverflow.com/questions/4491156/get-the-export-value-of-a-checkbox-using-itextsharp/
public static string GetExportValue(AcroFields.Item item)
{
var valueDict = item.GetValue(0);
var appearanceDict = valueDict.GetAsDict(PdfName.AP);
if (appearanceDict != null)
{
var normalAppearances = appearanceDict.GetAsDict(PdfName.N);
// /D is for the "down" appearances.
// if there are normal appearances, one key will be "Off", and the other
// will be the export value... there should only be two.
if (normalAppearances != null)
{
foreach (var curKey in normalAppearances.Keys)
if (!PdfName.OFF.Equals(curKey))
return curKey.ToString().Substring(1); // string will have a leading '/' character, so remove it!
}
}
// if that doesn't work, there might be an /AS key, whose value is a name with
// the export value, again with a leading '/', so remove it!
var curVal = valueDict.GetAsName(PdfName.AS);
if (curVal != null)
return curVal.ToString().Substring(1);
else
return string.Empty;
}
public static void ReturnPDF(byte[] contents)
{
ReturnPDF(contents, null);
}
public static void ReturnPDF(byte[] contents, string attachmentFilename)
{
var response = HttpContext.Current.Response;
if (!string.IsNullOrEmpty(attachmentFilename))
response.AddHeader("Content-Disposition", "attachment; filename=" + attachmentFilename);
response.ContentType = "application/pdf";
response.BinaryWrite(contents);
response.End();
}
}
Your question was confusing because it used a reader object that didn't refer to iTextSharp's PdfReader class and it used a formFieldMap object of which the type was unknown (it doesn't seem related to iTextSharp). Your edit was very welcome to understand the question.
The field names you mention look as if they are fields in an XFA form, but the article you refer to talks about filling out AcroForm documents, so let's assume that your form was indeed born as an XFA form, but later on converted to an AcroForm.
In this case, nobody will be able to tell you which values to pick to set the radio buttons without seeing the PDF. Please download chapter 6 of my book and read section 6.3.5, more specifically where it says Inspecting the form and its fields. On page 183, you can read that the possible values for a group of radio buttons is either "Off"–no radio button is selected— or a code that is defined in the form itself.
For instance: in the example from the book, the possible values for the category group were spec, toro, anim, etc...
This means that you can set a radio box in that group like this:
formFields.SetField("category", "spec");
or:
formFields..SetField("category", "toro");
or:
formFields.SetField("category", "anim");
and so on.
So, if you want to set a radio button in a radiogroup named pg1rb, you first need to know which are the possible values. You assume that the possible values are "Yes" and "No" in which case you could use:
formFields.SetField("pg1rb", "Yes");
or
formFields.SetField("pg1rb", "No");
But the possible values could also be "1" and "0", "On" and "Off", "true" and "false",... The possible values were chosen by the person who created the form.
You can get these values programmatically by using the code from page 182:
StringBuilder sb = new StringBuilder();
sb.Append("Possible values for pg1rb:");
sb.Append(Environment.NewLine);
states = form.GetAppearanceStates("pg1rb");
for (int i = 0; i < states.Length - 1; i++) {
sb.Append(states[i]);
sb.Append(", ");
}
sb.Append(states[states.Length - 1]);
Inspect what was written to the sb object and you have the values you are looking for.
So I have a basic web service that is grabbing data from a MSSQL database. It works as it's supposed to in terms of SQL connections and queries however, I would like to know if it's possible to have the data displayed a little more elegantly. My goal is to return one name on each line but the web service just spits it all out between string tags and all on one line. I'm EXTREMELY new to C# and ASP.NET and am amazed I made it this far. I just need to format the data in a more pleasant way if possible.
Here is my Code
namespace CustomerService
{
/// <summary>
/// Summary description for Service1
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class Service1 : System.Web.Services.WebService
{
[WebMethod]
//create new webMethod to get names
public string getNames()
{
int size = DataHelper.name().Count();
string[] names = new string[size];
names = DataHelper.name();
return toString(names);
}
//take array passed in and convert to one single string
public string toString(string[] names)
{
int size = names.Count();
string[] nameArray = new string[size];
nameArray = names;
string output = "";
for (int x = 0; x < size; x++)
{
output = output + "\n" + nameArray[x];
}
return output;
}
}
}
And then the DataHelper service:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
namespace CustomerService
{
public class DataHelper
{
//create method to get names from customer DB
public static string[] name()
{
string currentName ="";
string[] names = new string[100];
double checkingBal;
double savingsBal;
double cdBal;
double mmBal;
//create connection
SqlConnection conn = new SqlConnection(#"Data Source=STE2074;Initial Catalog=ATMWeb;Persist Security Info=True;User ID=stp;Password=stp48329");
//create command to get names
string sqlString = "SELECT * FROM tblUsers";
SqlCommand cmd = new SqlCommand(sqlString, conn);
conn.Open();
int x = 0;
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
currentName = reader["firstName"].ToString();
names[x] = currentName;
x++;
}
//close connections
conn.Close();
reader.Close();
return names;
}
}
}
And this is the final result:
<?xml version="1.0" encoding="UTF-8"?>
<string xmlns="http://tempuri.org/"> Stephen lisa steve kyle s Lisa steven Customer chelsea jon karen jessica meagan </string>
I would like a new line after each name...is this possible?
Create a class and return that.
PUBLIC Class MyOldStringNames
{
property string NameHolder { get; set; }
}
End Class
List<MyOldStringNames> myListOfOldStringNames = new List<MyOldStringNames>();
For Each item in names
MyOldStringNames myItemToAdd = new MyOldStringNames() { NameHolder = item.toString() };
myListOfOldStringNames.add(myItemToAdd);
End
return myListOfOldStringNames;
Of course your method would then be something like this. :
public List<MyOldStringNames> getNames()
{
int size = DataHelper.name().Count();
string[] names = new string[size];
names = DataHelper.name();
//Do stuff above
//return data as shown above;
}