i am trying to insert this command in a dynamic way in a unity project:
public static string insertPlayerCmd = "INSERT INTO Player (Name) VALUES (?);";
I am using this method on a repository to insert a name into the database:
public AccountContents SaveAccount(string newName)
{
string name = newName;
var transaction = Finder.DB.DatabaseConnection.BeginTransaction();
var command = Finder.DB.DatabaseConnection.CreateCommand();
AccountContents newAccountContents = null;
try
{
command.CommandText = ConstantDbRequests.insertPlayerCmd;
command.Parameters.Add(newName);
var newAccount = command.ExecuteReader();
transaction.Commit();
newAccountContents = new AccountContents(newAccount.GetInt32(0), newAccount.GetString(1));
}
catch (Exception e)
{
Debug.Log(e.ToString());
}
return newAccountContents;
}
the line command.Parameters.Add(newName); throws an invalid cast exception.
I verified my database in SQLite, and the column to insert is of Text type, all the names on the SQL command are writen correctly, but i can't add the parameter to replace the ? wildcard
Related
So, I'm creating a desktop banking application. It's nothing too serious, I'm just trying to practice and get better.
// Method I use to get a connection. I know this works.
public static Connection getConnection() throws SQLException {
String sCon = "jdbc:sqlite:banking.sqlite";
Connection connection = DriverManager.getConnection(sCon);
return connection;
}
.
..
...
.....Other code
Method I attempt to use to create and manipulate the data in the result set.
The problem I believe starts here. With this code, I am only able to return one row of the result set and only the last row.
public static Customers getAccounts(Customers c) {
String query = "select RowCount, Customers.Account_Number, "
+ "Customers.First_Name, Last_Name, Address, "
+ "Phone_Number, Accounts.Balance "
+ "from Customers "
+ "join Accounts ";
try (Connection connection = getConnection();
PreparedStatement ps = connection.prepareStatement(query);
ResultSet rs = ps.executeQuery()) {
while (rs.next()) {
String fName = rs.getString("First_Name");
String lName = rs.getString("Last_Name");
String address = rs.getString("Address");
String phone = rs.getString("Phone_Number");
String accNum = rs.getString("Account_Number");
String balance = rs.getString("Balance");
c.setFirstName(fName);
c.setLastName(lName);
c.setAddress(address);
c.setPhoneNumber(phone);
c.setAccountNumber(accNum);
c.setBalance(balance);
}
return c;
} catch (SQLException e) {
System.err.println(e);
}
return null;
}
}
Here is the method that is linked to the button I use to perform what I'm trying to attempt. It's part of the Controller class. I believe this method is also a part of the problem. Any ideas? Thank for all you guys do. This website is a real benefit to the community.
public void next() {
Customers c = new Customers();
DBInterface.getAccounts(c);
firstNameF2.setText(c.getFirstName());
lastNameF2.setText(c.getLastName());
addressF2.setText(c.getAddress());
phoneNumberF2.setText(c.getPhoneNumber());
accNumF.setText(c.getAccountNumber());
balanceF.setText(c.getBalance());
}
If you are expecting to get multiple Customers objects, then you definitely should return a list of that.
public static List<Customers> getAccounts() {
// Whatever you originally had...
final List<Customers> ret = new ArrayList<>();
while (rs.next()) {
String fName = rs.getString("First_Name");
String lName = rs.getString("Last_Name");
String address = rs.getString("Address");
String phone = rs.getString("Phone_Number");
String accNum = rs.getString("Account_Number");
String balance = rs.getString("Balance");
final Customers cust = new Customers();
cust.setFirstName(fName);
cust.setLastName(lName);
cust.setAddress(address);
cust.setPhoneNumber(phone);
cust.setAccountNumber(accNum);
cust.setBalance(balance);
ret.add(cust);
}
return ret;
}
I have removed the part about passing in the instance of Customers (which would have ended up as passing in List<Customers>. If you really need to do that, you can add back in and do all the necessary checks.
I have datain my database (shown in the screen)
But the returned values are null? How is that possible, in the output I got this:
This is the code I'm using:
public static SQLiteConnection dbConnection = new SQLiteConnection("RPR_REKENSOFTWARE_DB.db");
public static List<String> GetParts()
{
var items = new List<String>();
try
{
string sSQL = #"SELECT * FROM parts;";
ISQLiteStatement dbState = dbConnection.Prepare(sSQL);
// Get the records
while (dbState.Step() == SQLiteResult.ROW)
{
// Say what it is.
string partNr = dbState[1] as string;
items.Add(partNr);
}
return items;
}
catch (Exception ex)
{
Debug.WriteLine(ex);
throw ex;
}
}
This is the database I'm using:
The reason is that you are converting the value from database to string, although it is actually an int. You should do:
string partNr = ( ( int )dbState[ 1 ] ).ToString();
Or more simply:
string partNr = dbState[ 1 ].ToString();
The reason is that the row returned from database is contains .NET equivalents of the DB column types and hence dbState[1] is an int. When you use as string on an int however, it cannot be cast and you get null.
I'm very new in programming and this is my first post (question) here, so please don't judge me.
I'm trying to build my first individual WCF service for my project. Let me first display my code , so it will be easier to understand.
This is my data access layer:
public class DataAccessLayer : IDisposable
{
string DBConnectionString = "DBCS";
public int ValidateUser(string employeeLogin, string employeePassword)
{
int outputResult = 0;
try
{
DatabaseProviderFactory factory = new DatabaseProviderFactory();
Database db = factory.Create(DBConnectionString);
string storedProcedureName = "uspValidateUser";
DbCommand dbCommand = db.GetStoredProcCommand(storedProcedureName);
db.AddInParameter(dbCommand, "#EmployeeLogin", DbType.String, employeeLogin);
db.AddInParameter(dbCommand, "#EmployeePassword", DbType.String, employeePassword);
db.AddOutParameter(dbCommand, "#OutRes", DbType.Int32, outputResult);
using (IDataReader reader = db.ExecuteReader(dbCommand))
{
Mapper.Reset();
Mapper.CreateMap<IDataReader, Int32>();
outputResult = (int)Mapper.Map<IDataReader, Int32>(reader);
}
}
catch (Exception ex)
{
throw ex;
}
return outputResult;
}
public void Dispose()
{
}
}
This is my stored procedure:
ALTER PROCEDURE [dbo].[uspValidateUser]
#EmployeeLogin VARCHAR(20),
#EmployeePassword VARCHAR(20),
#OutRes int Output
AS
SET #OutRes = (select count(*)
from dbo.tblEmployee
where EmployeeLogin = #EmployeeLogin
and EmployeePassword = #EmployeePassword)
if (#OutRes = 1)
BEGIN
SET NOCOUNT ON;
set #OutRes = 1 --Login is correct
end
else
BEGIN
set #OutRes = 0 -- Login is incorrect
END
And code behind my web form:
public int ValidateUser(string employeeLogin, string employeePassword)
{
int outputResults = 0;
try
{
using (HospitalWCFService.ContractsClient objWCFService = new HospitalWCFService.ContractsClient())
{
outputResults = objWCFService.ValidateUser(employeeLogin, employeePassword);
}
}
catch (Exception ex)
{
lgnEmployeeLogin.FailureText = ex.Message;
}
return outputResults;
}
protected void ValidateUser(object sender, AuthenticateEventArgs e)
{
int outputResults = 0;
outputResults = ValidateUser(lgnEmployeeLogin.UserName, lgnEmployeeLogin.Password);
if (outputResults == 1)
{
Session["UserName"] = lgnEmployeeLogin.UserName.ToString();
FormsAuthentication.RedirectFromLoginPage(lgnEmployeeLogin.UserName, lgnEmployeeLogin.RememberMeSet);
}
else
{
lgnEmployeeLogin.FailureText = "Username and/or password is incorrect.";
}
}
To get user credentials I'm using login control lgnEmployeeLogin.
I'm having problems of retrieving that output integer #OutRes parameter from database using Mapper (I need to use mapper)
If it is possible, please explain solution in easiest language possible as I might not understand difficult technical slang.
Thank you all in advance!
Your lack of answers could be because you say that you have to use mapper - but I chose to ignore that, because ExecuteReader is for dealing with the rows and columns returned by a stored procedure, not for its output parameters. The stored procedure you provided has no result set!
This could be as simple as
db.ExecuteNonQuery();
OutputResult = db.Parameters( "#OutRes").value
to be clear, this replaces your using...ExecuteReader block
Also note: your code did not deal with opening (and closing) the SQL connection (db.Connection.Open();, so I ignored that here too.
I am trying to find a recored with an encrypted string like
description = "oYAFfrNS2OszASY7Vo182A=="
and it is stored in sqlite database like
oYAFfrNS2OszASY7Vo182A==
in the description field.
My android code is:
Cursor c = db.query(table, columns,
whereclause,
null,
null,
null,
null);
try {
if (c.getCount() == 0) {
c.close();
return "";
}
c.moveToFirst();
int namecol = c.getColumnIndex(columns[0]);
li = (c.getString(namecol));
c.close();
} catch (Exception e) {
System.out.println("Exception: " + e.toString());
}
where table name, where clause and columns all are correct for sure but I am unable to get the result with encrypted string which I have mentioned.
I found the problem by debugging further actually there is one new line character in my encrypted string which were not passed in this.
in my asp.net application, i am calling a stored procedure (oracle) to get some values from database.
Following is the sp:
create or replace PROCEDURE GetUserData(
--SQLWAYS_EVAL# ARCHAR(100)
UserName IN NVARCHAR2, v_refcur OUT SYS_REFCURSOR)
as
BEGIN
BEGIN --SQLWAYS_EVAL# =#Password;
open v_refcur for SELECT StaffId,
UserName,
Password,
Pin,
LastUpdateId,
LastUpdateDate,
FullName,
PinFailedAttempts,
PinFailedDate
FROM UserData
WHERE UserName = UserName;
END;
RETURN;
END;
Can anyone help me how to call this sp from my asp.net code.
Using ODP, you'll can do something like the following:
make your stored procedure a function that takes the user name in parameter and returns a refcursor
create or replace FUNCTION GetUserData(UserName IN NVARCHAR2) RETURN SYS_REFCURSOR;
and then
using (var connection = new OracleConnection(connectionString))
{
using (var command = new OracleCommand("GetUserData", connection))
{
command.CommandType = CommandType.StoredProcedure;
command.BindByName = true;
// Return value parameter has to be added first !
var returnValueParameter = new OracleParameter();
returnValueParameter.Direction = ParameterDirection.ReturnValue;
returnValueParameter.OracleDbType = ParameterDirection.RefCursor;
command.Parameters.Add(returnValueParameter);
var userNameParameter = command.Parameters.Add("UserName", userName);
returnValueParameter.Direction = ParameterDirection.In;
using (OracleDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
// Read the current record's fields
}
}
}
}
The Microsoft Enterprise Library simplifies the discovery and binding of Oracle Stored Procedures. It is not too difficult to build a Data Access Layer between your Business Objects and the Oracle database. I am more a fan of ORM tools these days like DevExpress's XPO, which in the latest release supports calling stored procedures. However, the Microsoft Entlib is free whereas DevExpress is not.
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using Microsoft.Practices.EnterpriseLibrary.Data;
using Your.BusinessObjects;
namespace DataAccess
{
public class UserDataDAL
{
public static Database dataBase = DatabaseFactory.CreateDatabase(); ///< Use default connection string configured in web.config
public static List<UserInfo> GetData(string userName)
{
List<UserInfo> listOfUserInfo = new List<UserInfo>();
UserInfo userInfo;
DbCommand cmd = dataBase.GetStoredProcCommand("SCHEMA.GETUSERDATA");
dataBase.DiscoverParameters(cmd);
dataBase.SetParameterValue(cmd, "USERNAME", userName);
using (IDataReader dr = dataBase.ExecuteReader(cmd))
{
while (dr.Read())
{
userInfo = new UserInfo();
userInfo.StaffId = dr["STAFFID"] != DBNull.Value ? Convert.ToInt32(dr["STAFFID"]) : 0;
userInfo.UserName = dr["USERNAME"] != DBNull.Value ? Convert.ToString(dr["USERNAME"]) : String.Empty;
userInfo.Password = dr["PASSWORD"] != DBNull.Value ? Convert.ToString(dr["PASSWORD"]) : String.Empty;
userInfo.LastUpdateId = Convert.ToInt32(dr["LASTUPDATEID"]);
userInfo.LastUpdateDate = dr["LASTUPDATEDATE"] != null ? Convert.ToDateTime(dr["LASTUPDATEDATE"]) : new DateTime();
listOfUserInfo.Add(userInfo);
}
}
return listOfUserInfo;
}
}
}
If you only ever expect one row to be returned from the procedure, then you can return the first item in the list if present etc.