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• casting BSTR as char* in a dll; different results depnding on VB/C# caller.

  - by Toby Wilson

  I have a dll function that takes BSTR parameters. These are casted as char* before being used for other things. When the dll is called from VB code this works fine. However, when it is called from C# code, only the first character is pointed to. Both of these are excel addIns for Pre-2007 and 2007+ versions of Office, which call into a faster C++ AddIn. They actually call it directly, not through Excel. The VB function declaration looks like this: Private Declare Function Test Lib "ExcelAddIn.xll" (ByVal param As String) As String The C# function declaration looks like this: [DllImport("ExcelAddIn.xll", CharSet=CharSet.Ansi)] [return:MarshalAs(UnmanagedType.BStr)] private static extern string Test([MarshalAs(UnmanagedType.BStr)] string param); When debugging the dll and watching the input BSTR values, they appear to be correct from both; just the C# one only casts the first character. Charset=CharSet.Unicode makes no difference. Any ideas anyone?

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• Comparing strings that contain formatting in C#

  - by Finglas

  I'm working on a function that given some settings - such as line spacing, the output (in string form) is modified. In order to test such scenarios, I'm using string literals, as shown below for the expected result. The method, using a string builder, (AppendLine) generates the said output. One issue I have run into is that of comparing such strings. In the example below, both are equal in terms of what they represent. The result is the area which I care about, however when comparing two strings, one literal, one not, equality naturally fails. This is because one of the strings emits line spacing, while the other only demonstrates the formatting it contains. What would be the best way of solving this equality problem? I do care about formatting such as new lines from the result of the method, this is crucially important. Code: string expected = @"Test\n\n\nEnd Test."; string result = "Test\n\n\nEnd Test"; Console.WriteLine(expected); Console.WriteLine(result); Output: Test\n\n\nEnd Test. Test End Test

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• error string list handle in C#

  - by Chelsea_cole

  Same namespace: 2 forms. public class Account //frm1 { public string Username; public string Password; } public class ListAcc { public static List<Account> UserList; } private void button1_Click(object sender, EventArgs e) { List<Account> UserList = new List<Account>(); Account acc = new Account(); acc.Username = textBox1.Text; acc.Password = textBox2.Text; UserList.Add(acc); } private void button2_Click(object sender, EventArgs e) //frm2 { string p = frmDangky.ListAcc.UserList[0].Username; // null ->error string p = frmDangky.ListAcc.UserList[0].Password; // null ->error } Someone help me? :( why my string is NULL???????? The textBox is not empty... Thanks!

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• Ravendb 960 does not honor JsonIgnore with property of Dictionary<string, object>

  - by David Robbins

  Does JsonIgnore not work when a property has data? I have the followin class: public class SomeObject { public string Name { get; set; } public DateTime Created { get; set; } public List<string> ErrorList { get; set; } [JsonIgnore] public Dictionary<string, object> Parameters { get; set; } public SomeObject() { this.ErrorList = new List<string>(); this.Parameters = new Dictionary<string, object>(); } } My expectation was that JsonIgnore would exclude properties from De- / Serialization. My RavenDB document has data. Am I missing something?

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• What is an efficient way to erase substrings?

  - by Legend

  I have a long string and a set of <end-index, string> list like the following: long_sentence = "This is a long long long long sentence" indices = [[6, "is"], [8, "is a"], [18, "long"], [23, "long"]] An element 6, "is" indicates that 6 is the end index of the word "is" in the string. I want to get the following string in the end: >> print long_sentence This .... long ......... long sentence" I tried an approach like this: temp = long_sentence for i in indices: temp = temp[:int(i[0]) - len(i[1])] + '.'*(len(i[1])+1) + temp[i[0]+1:] While this seems to be working, it is taking exceptionally long time (more than 6 hours on 5000 strings inside a 300 MB file). Is there a way to speed this up?

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• Can not issue data manipulation statements with executeQuery in java

  - by user225269

  I'm trying to insert records in mysql database using java, What do I place in this code so that I could insert records: String id; String name; String school; String gender; String lang; Scanner inputs = new Scanner(System.in); System.out.println("Input id:"); id=inputs.next(); System.out.println("Input name:"); name=inputs.next(); System.out.println("Input school:"); school= inputs.next(); System.out.println("Input gender:"); gender= inputs.next(); System.out.println("Input lang:"); lang=inputs.next(); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/employee_record", "root", "MyPassword"); PreparedStatement statement = con.prepareStatement("insert into employee values('id', 'name', 'school', 'gender', 'lang');"); statement.executeUpdate();

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• Removing whitespace in Java string?

  - by waitinforatrain

  Hi guys, I'm writing a parser for some LISP files. I'm trying to get rid of leading whitespace in a string. The string contents are along the lines of: :FUNCTION (LAMBDA (DELTA PLASMA-IN-0) (IF (OR (>= #61=(+ (* 1 DELTA) PLASMA-IN-0) 100) (<= #61# 0)) PLASMA-IN-0 #61#)) The tabs are all printed as 4 spaces in the file, so I want to get rid of these leading tabs. I tried to do this: string.replaceAll("\\s{4}", " ") - but it had no effect at all on the string. Does anyone know what I'm doing wrong? Is it because it is a multi-line string? Thanks

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• What is the best DBMS for the job?

  - by Evernoob

  Just had a discussion at work about the merits of using PostgreSQL over MySQL and vice-versa. Does anyone have any practical experience where there is a valid reason to use one over the other? Some people were saying that Postgre is better for security purposes whereas MySQL is becoming more feature rich... I'm not sure what to make of it.

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• Which database invented the "limit" SQL query syntax?

  - by Howard

  MySQL has a nice feature (although non standard) which allow to query resultsets' limit, offset as SELECT * FROM TABLE LIMIT M, N; Is it created by MySQL? or Postgres?

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• is the code given in description is executable in Windows system?

  - by OM The Eternity

  is the code given is executable in Windows system? as it seems to be Linux commands echo 'create database foo2' | mysql -uroot mysqldump --skip-triggers -uroot foo | mysql -uroot foo2

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• How can i convert a string into byte[] of unsigned int 32 C#

  - by Miroo

  i have string like "0x5D, 0x50, 0x68, 0xBE, 0xC9, 0xB3, 0x84, 0xFF" i wanna convert it into byte[] key= new byte[] { 0x5D, 0x50, 0x68, 0xBE, 0xC9, 0xB3, 0x84, 0xFF}; i thought about splitting the string by ',' then loop on it and setvalue into another byte[] in index of i string Key = "0x5D, 0x50, 0x68, 0xBE, 0xC9, 0xB3, 0x84, 0xFF"; string[] arr = Key.Split(','); byte[] keybyte= new byte[8]; for (int i = 0; i < arr.Length; i++) { keybyte.SetValue(Int32.Parse(arr[i].ToString()), i); } but seems like it doesn't work i get error in converting the string into unsigned int32 on the first beginning an help would be appreciated

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• Phase REST XML into variable

  - by 001

  I want to get a response from the REST XML web service, and phase it into variables so I can use them in my program. 1) How come this code does not work? I get an empty string... // Get response string ws_response=""; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { // Get the response stream StreamReader reader = new StreamReader(response.GetResponseStream()); // web service response string ws_response = reader.ReadToEnd; // <---???? I get an empty string // do phasing here (ie XML element into variable) etc.. // }

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• Looking for open sourced BI (My Sql)

  - by fatnjazzy

  Hi, I know that there are few open sourced / Free BI projects and I am looking recommendations. I have a growing Mysql database that i got tired from writing sql queries + gui + filtering over and over again. if i am not able to find a free one than my budget will be: (1$ - 2500$ ) My needs are: Mysql 5 Connection. user permissions export options Basic Dashboard -- nice to have: Web Based GUI Development framework integration in PHP

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• Reading a part of a alpha numeric string in SQL

  - by novice

  I have a table with one column " otname " table1.otname contains multiple rows of alpha-numeric string resembling the following data sample: 11.10.32.12.U.A.F.3.2.21.249.1 2001.1.1003.8281.A.LE.P.P 2010.1.1003.8261.A.LE.B.B I want to read the fourth number in every string ( part of the string in bold ) and write a query in Oracle 10g to read its description stored in another table. My dilemma is writing the first part of the query.i.e. choosing the fourth number of every string in a table My second query will be something like this: select description_text from table2 where sncode = 8281 -- fourth part of the data sample in every string Many thanks. novice

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• How do I conditionally select a field from one of two tables?

  - by freakwincy

  I have two tables invoices and pending_payments both of which have the following rows in common: invoice_id and balance. I want to do a select in MySQL that'll work thus: [pseudo-code] if(invoice_id exists in pending_payments table) { select balance from pending_payments where invoice_id = yadayadayada } else { select balance from invoices where invoice_id = yadayadayada } Is this even doable in MySQL? If so, how?

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• Average rating script

  - by MILESMIBALERR

  I need to know how to make a rating script for a site. I have a form that submits a rating out of ten to mysql. How would you get the average rating to be displayed from the mysqk column? ---using PHP with mysql

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• Adapting pseudocode to java implementation for finding the longest word in a trie

  - by user1766888

  Referring to this question I asked: How to find the longest word in a trie? I'm having trouble implementing the pseudocode given in the answer. findLongest(trie): //first do a BFS and find the "last node" queue <- [] queue.add(trie.root) last <- nil map <- empty map while (not queue.empty()): curr <- queue.pop() for each son of curr: queue.add(son) map.put(son,curr) //marking curr as the parent of son last <- curr //in here, last indicate the leaf of the longest word //Now, go up the trie and find the actual path/string curr <- last str = "" while (curr != nil): str = curr + str //we go from end to start curr = map.get(curr) return str This is what I have for my method public static String longestWord (DTN d) { Queue<DTN> holding = new ArrayQueue<DTN>(); holding.add(d); DTN last = null; Map<DTN,DTN> test = new ArrayMap<DTN,DTN>(); DTN curr; while (!holding.isEmpty()) { curr = holding.remove(); for (Map.Entry<String, DTN> e : curr.children.entries()) { holding.add(curr.children.get(e)); test.put(curr.children.get(e), curr); } last = curr; } curr = last; String str = ""; while (curr != null) { str = curr + str; curr = test.get(curr); } return str; } I'm getting a NullPointerException at: for (Map.Entry<String, DTN> e : curr.children.entries()) How can I find and fix the cause of the NullPointerException of the method so that it returns the longest word in a trie?

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• app.config and 64-bit machines

  - by Dale Lutes

  I have an app that works fine on 32-bit systems, but fails on XP 64 bit systems. I've tracked it down to the connection string defined in my app.config thus: <connectionStrings> <clear/> <add name="IFDSConnectionString" connectionString="Data Source=fdsdata;Initial Catalog=IFDS; Trusted_Connection=true;Connect Timeout=0" providerName="System.Data.SqlClient" /> </connectionStrings> When I try to reference it in code, I find that the ConfigurationManager.ConnectionStrings collection only contains the LocalSqlServer connection string from the machine.config file and not my custom string. Another oddity is that it works fine when I run the app out of Visual Studio. It is only when I run out of the release folder that the connection string does not get defined. The application's .exe.config file is there in the release folder along with the .exe file and is up to date.

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• Queries stuck in "copying to tmp table"

  - by Parik

  I am running some sample tests against mysql, and finding that there are a bunch of queries which are stuck in "copying to tmp tables". They remain stuck in the same state. They are usually aggregate queries and I can kill those queries. But how can I find out what is causing them to be stuck? I am using mysql 5.1.42 with the innodb plugin.

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• Select one column from a row in hibernate

  - by ComfortablyNumb

  I am trying to do a simple query to get a unique result back in hibernate here is my code. public String getName(Integer id) { Session session = getSessionFactory().openSession(); String name = (String)session.createSQLQuery("SELECT name FROM users WHERE user_id = :userId").setParameter("userId", id).uniqueResult(); return name; } The name that is being returned is stored as HTML text that includes html syntacx language. I think this is what is causing the problem but it doesnt make sense I just want to return it as a string. It is only happening on this one field name, I can get every other field in the row but this one it gives me the error. I am getting an exception. The exception I am getting is No Dialect mapping for JDBC type: -1; nested exception is org.hibernate.HibernateException How do you query for a specific column on a row in hibernate?

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• Getting duplicate count when executing INSERT IGNORE via JDBC

  - by Nickolay Komar

  Is it possible to get the duplicate count when executing MySQL "INSERT IGNORE" statement via JDBC? For example, when I execute an INSERT IGNORE statement on the mysql command line, and there are duplicates I get something like Query OK, 0 rows affected (0.02 sec) Records: 1 Duplicates: 1 Warnings: 0 Note where it says "Duplicates: 1", indicating that there were duplicates that were ignored. Is it possible to get the same information when executing the query via JDBC? Thanks.

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• Can I create a database using PDO in PHP

  - by thearchitect

  I am create a class which uses PDO to interact with MySQL. Can I create a new MySQL table using PDO?

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• Maintain case sensitivity when importing db into windows

  - by razass

  I have an export from a MYSQL database on a linux machine however when importing that database into MYSQL on windows all of the table names that were camel cased are now all lower case. The sql dump has the correct case in it but the importing via phpmyadmin seams to remove these. How can I import it and keep the case? Thanks

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• gauge chart is not displaying any thing

  - by Sandy

  i am trying to display the latest speed in mysql database on guage chart. i have tried so many things but gauge is not display plz any can help me...my code is attached and php part shows the correct value but dont know why guage is not display <?php $host="localhost"; // Host name $username="root"; // Mysql username $password=""; // Mysql password $db_name="mysql"; // Database name $tbl_name="gpsdb"; // Table name // Connect to server and select database. $con=mysql_connect("$host", "$username")or die("cannot connect"); mysql_select_db("$db_name")or die("cannot select DB"); $data = mysql_query("SELECT speed FROM gpsdb WHERE DeviceId=1234 ORDER BY TIME DESC LIMIT 1") or die(mysql_error()); while ($nt = mysql_fetch_assoc($data)) { $speed = $nt['speed']; $jsonTable = json_encode($speed); echo $jsonTable; } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <title> Google Visualization API Sample </title> <script type="text/javascript" src="//www.google.com/jsapi"></script> <script type="text/javascript"> google.load('visualization', '1', {packages: ['gauge']}); </script> <script type="text/javascript"> function drawVisualization() { // Create and populate the data table. var data = new google.visualization.DataTable(<?=$speed?>); // Create and draw the visualization. new google.visualization.Gauge(document.getElementById('visualization')). draw(data); } google.setOnLoadCallback(drawVisualization); </script> </head> <body style="font-family: Arial;border: 0 none;"> <div id="visualization" style="width: 600px; height: 300px;"></div> </body> </html>

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• How to get the substring in C#?

  - by Nano HE

  Hi, I can get the first three characters with the function below. However, how can I get the output of the last five characters (Three) with Substring() function. Or other string function will be used? Thank you. static void Main() { string input = "OneTwoThree"; // Get first three characters string sub = input.Substring(0, 3); Console.WriteLine("Substring: {0}", sub); // Output One. }

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