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  • Creating an instance within the Class itself

    - by didxga
    What's going on when the assignment statement executed at Line 4, does compiler ignore the new operator and keep the foo variable being null or something else happen to handle this awkward moment? public class Foo { // creating an instance before its constructor has been invoked, suppose the "initializing" // gets printed in constructor as a result of the next line, of course it will not print it private Foo foo = new Foo();//Line 4 public Foo() { System.out.println("initializing"); } }

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  • Play a wav file retrieved from a database on the iPhone?

    - by user312917
    I have alot of wav files stored in sqlite3, but when I retrieve one of them, I can't play it. The retrieve code is NSData *soundData = (NSDATA *)sqlite3_column_blob(statement, 0); mPlayer = [[AVAudioPlayer alloc] initWithData:soundData error:&error]; The data is stored as binary and it's there when I search for it using sqlite3.

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  • How can I left-justify numerical output in fortran?

    - by mishaF
    I am writing some simple output in fortran, but I want whitespace delimiters. If use the following statement, however: format(A20,ES18.8,A12,ES18.8) I get output like this: p001t0000 3.49141273E+01obsgp_oden 1.00000000E+00 I would prefer this: p001t0000 3.49141273E+01 obsgp_oden 1.00000000E+00 I tried using negative values for width (like in Python) but no dice. So, is there a way to left-justify the numbers? Many thanks in advance!

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  • Improving performance for WRITE operation on Oracle DB in Java

    - by Lucky
    I've a typical scenario & need to understand best possible way to handle this, so here it goes - I'm developing a solution that will retrieve data from a remote SOAP based web service & will then push this data to an Oracle database on network. Also, this will be a scheduled task that will execute every 15 minutes. I've event queues on remote service that contains the INSERT/UPDATE/DELETE operations that have been done since last retrieval, & once I retrieve the events for last 15 minutes, it again add events for next retrieval. Now, its just pushing data to Oracle so all my interactions are INSERT & UPDATE statements. There are around 60 tables on Oracle with some of them having 100+ columns. Moreover, for every 15 minutes cycle there would be around 60-70 Inserts, 100+ Updates & 10-20 Deletes. This will be an executable jar file that will terminate after operation & will again start on next 15 minutes cycle. So, I need to understand how should I handle WRITE operations (best practices) to improve performance for this application as whole ? Current Test Code (on every cycle) - Connects to remote service to get events. Creates a connection with DB (single connection object). Identifies the type of operation (INSERT/UPDATE/DELETE) & table on which it is done. After above, calls the respective method based on type of operation & table. Uses Preparedstatement with positional parameters, & retrieves each column value from remote service & assigns that to statement parameters. Commits the statement & returns to get event class to process next event. Above is repeated till all the retrieved events are processed after which program closes & then starts on next cycle & everything repeats again. Thanks for help !

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  • Help Desk Database Design

    - by user237244
    The company I work at has very specific and unique needs for a help desk system, so none of the open source systems will work for us. That being the case, I created a custom system using PHP and MySQL. It's far from perfect, but it's infinitely better than the last system they were using; trust me! It meets most of our needs quite nicely, but I have a question about the way I have the database set up. Here are the main tables: ClosedTickets ClosedTicketSolutions Locations OpenTickets OpenTicketSolutions Statuses Technicians When a user submits a help request, it goes in the "OpenTickets" table. As the technicians work on the problem, they submit entries with a description of what they've done. These entries go in the "OpenTicketSolutions" table. When the problem has been resolved, the last technician to work on the problem closes the ticket and it gets moved to the "ClosedTickets" table. All of the solution entries get moved to the "ClosedTicketSolutions" table as well. The other tables (Locations, Statuses, and Technicians) exist as a means of normalization (each location, status, and technician has an ID which is referenced). The problem I'm having now is this: When I want to view a list of all the open tickets, the SQL statement is somewhat complicated because I have to left join the "Locations", "Statuses", and "Technicians" tables. Fields from various tables need to be searchable as well. Check out how complicated the SQL statement is to search closed tickets for tickets submitted by anybody with a first name containing "John": SELECT ClosedTickets.*, date_format(ClosedTickets.EntryDate, '%c/%e/%y %l:%i %p') AS Formatted_Date, date_format(ClosedDate, '%c/%e/%y %l:%i %p') AS Formatted_ClosedDate, Concat(Technicians.LastName, ', ', Technicians.FirstName) AS TechFullName, Locations.LocationName, date_format(ClosedTicketSolutions.EntryDate, '%c/%e/%y') AS Formatted_Solution_EntryDate, ClosedTicketSolutions.HoursSpent AS SolutionHoursSpent, ClosedTicketSolutions.Tech_ID AS SolutionTech_ID, ClosedTicketSolutions.EntryText FROM ClosedTickets LEFT JOIN Technicians ON ClosedTickets.Tech_ID = Technicians.Tech_ID LEFT JOIN Locations ON ClosedTickets.Location_ID = Locations.Location_ID LEFT JOIN ClosedTicketSolutions ON ClosedTickets.TicketNum = ClosedTicketSolutions.TicketNum WHERE (ClosedTickets.FirstName LIKE '%John%') ORDER BY ClosedDate Desc, ClosedTicketSolutions.EntryDate, ClosedTicketSolutions.Entry_ID One thing that I'm not able to do right now is search both open and closed tickets at the same time. I don't think a union would work in my case. So I'm wondering if I should store the open and closed tickets in the same table and just have a field indicating whether or not the ticket is closed. The only problem I can forsee is that we have so many closed tickets already (nearly 30,000) so the whole system might perform slowly. Would it be a bad idea to combine the open and closed tickets?

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  • subqueries in UPDATE SET (sql server 2005)

    - by itdebeloper
    I have a question about using subqueries in an Update statement. My example: UPDATE TRIPS SET locations = city + ', ' FROM (select Distinct city from poi where poi.trip_guid = trips.guid) Is it possible to refer to main table value (trips.guid) in subqueries? When i try to use trips.guid I get the error: "The multi-part identifier "trips.guid" could not be bound."

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  • A stupid question in if block

    - by priyanka.sarkar_2
    I have a very stupid issue if (updateYN.ToUpper() != Constants.NO || updateYN.ToUpper() != Constants.N) { // execute code for any other updateYN } I am trying to perform a filteration that if the value of updateYN is not NO(Constants.NO) or N(Constants.N), then execute the statement. But the problem is that , irresptive of the values , the if block is executing. What wrong is there Thanks

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  • Objective C @autoreleasepool directive

    - by Cemre
    I am reading a book which says (if I am not getting it wrong) wrapping some code with @autoreleasepool statement enables the ARC. First of all is this the case ? My second concern is when I am doing some iOS example programs, although I enable ARC when creating a new project, I never see this directive being used anywhere (in the automatically generated code). Does this mean that ARC is not being used ? Any ideas/pointers is appreciated.

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  • Flexible array members in C - bad?

    - by Lionel
    I recently read that using flexible array members in C was poor software engineering practice. However, that statement was not backed by any argument. Is this an accepted fact? (Flexible array members are a C feature introduced in C99 whereby one can declare the last element to be an array of unspecified size. For example: ) struct header { size_t len; unsigned char data[]; };

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  • SQL ENQUIRY In how to Get defined number of records

    - by ramadan2050
    I have a select statement, retrieve about 1000 record I want to modify it to return only some records defined by @startIndex and @count e.g. : If I said @startIndex=20 and @count=20 the result will be : from the 21th record to 40th I try to make it, but it take the same time as if I retrieve the 1000 record what is the best way to do that

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  • Adding Refresh Tag to View

    - by RJL
    I need a view to refresh automatically every 20 seconds, and have added the following code to the view header via the views GUI - with no success. The code (or portions of it) are simply displayed on the view and no updating is performed. I've tried omitting both and just the ending ?php statement. If someone can tell me the proper code to use, or a better approach at updating the view automatically, I'd be very appreciative. Thanks. print ";

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  • Rails - Always have to check exists, and then value?

    - by Jason B
    I am checking to see if a value in a related table exists quite often in my view, in this case, expenses have approvals. If they have not been submitted, then there is no record of them in the approvals table. I am ending up with some really awkward code <% if !expense_item.expense_approval || expense_item.expense_approval.approval_status == 0 %> Is there a way to do an if statement on a value, without having to check if it exists first? Or some default way to set it nil?

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  • Table Adapter query Builder ASP.NET

    - by kmsony32
    I want to connect my Table adapter with the Oracle, for that I am preparing a sql query with the query builder. The query which is running fine in Oracle but makes syntax error with query builder.It shows unable to parse the query text. I am using case statement and joins within the query.

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  • MVC 4 Controller Compilation Error trying to return a Model

    - by Joe
    This is a newbie configuration problem I suspect. See return statement comment in code snippet. [HttpGet] public ActionResult TestService() { ViewBag.Message = "DataLayer Service"; Service dataLayerService = new Service {CookieContainer = new CookieContainer()}; dataLayerService.SetSessionAppName("SAND"); WebServiceModel webServiceModel = new WebServiceModel(); webServiceModel.Result = dataLayerService.GetSessionAppName(); return this.View(webServiceModel); // <== Cannot resolve View "TestService" }

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  • Combine First, Middle Initial, Last name and Suffix in T-SQL (No extra spaces)

    - by Paul
    I'm trying not to reinvent the wheel here...I have these four fields [tbl_Contacts].[FirstName], [tbl_Contacts].[MiddleInitial], [tbl_Contacts].[LastName], [tbl_Contacts].[Suffix] And I want to create a FullName field in a view, but I can't have extra spaces if fields are blank...So I can't do FirstName + ' ' + MiddleInitial + ' ' + LastName + ' ' + Suffix...Because if there is no middle initial or suffix I'd have 2 extra spaces in the field. I think I need a Case statement, but I thought someone would have a handy method for this...Also, the middleinitial and suffix may be null.

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  • Phpmyadmin mysql foreign key help

    - by Alan
    Hey guys i'm using phpmyadmin (php & mysql) and i'm having alot of trouble linking the tables using foreign keys. I'm getting negative values for the field countyId (which is the foriegn key). However it is linking to my other table fine and it's cascading fine. So when I go to add data there will be a drop box for the CountyId and the vlaues will look something like this, " -1 1- " Here is my alter statement, ALTER TABLE Baronies ADD FOREIGN KEY (CountyId) REFERENCES Counties (CountyId) ON DELETE CASCADE

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  • graph with database

    - by Flip_novidade
    I need to make two graphs with data coming from the database. I do not know where I am going wrong. If someone can show me the correct way, or provide any examples. must be two graphs, a graph of a specific student another graph of all students thank you public class NotasBean { private Notas notas; private Notas selectedNotas; private List<Notas> filtroNotass; public Notas getNotas() { return notas; } public void setNotas(Notas notas) { this.notas = notas; } public Notas getSelectedNotas() { return selectedNotas; } public void setSelectedNotas(Notas selectedNotas) { this.selectedNotas = selectedNotas; } public List<Notas> getFiltroNotass() { return filtroNotass; } public void setFiltroNotass(List<Notas> filtroNotass) { this.filtroNotass = filtroNotass; } public void prepararAdicionarNotas(){ notas = new Notas(); } public void adicionarNotas(){ dao.NotasDao obj_dao = new dao.NotasDao(); obj_dao.save(notas); } } package dao; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import javax.faces.application.FacesMessage; import javax.faces.context.FacesContext; import model.Aluno; import model.Notas; import model.Notas; public class NotasDao { private Conexao obj_conexao; public NotasDao() { obj_conexao = new Conexao(); } public List<Notas> list() { List<Notas> array_registros = new ArrayList<Notas>(); try { String sql = "Select alu_in_ra, dis_st_sigla, ald_fl_p1, ald_fl_p2, ald_fl_p3, ald_fl_trab1, ald_fl_trab2 from cad_aluno_disciplina"; Statement comando_sql = (Statement) obj_conexao.getConexao() .createStatement(); ResultSet obj_result = comando_sql.executeQuery(sql); while (obj_result.next()) { Notas obj_notas = new Notas(); obj_notas.setAlura(obj_result.getInt("alu_in_ra")); obj_notas.setDiscsigla(obj_result.getString("dis_st_sigla")); obj_notas.setP1(obj_result.getInt("ald_fl_p1")); obj_notas.setP2(obj_result.getInt("ald_fl_p2")); obj_notas.setP3(obj_result.getInt("ald_fl_p3")); obj_notas.setTrb1(obj_result.getInt("ald_fl_trab1")); obj_notas.setTrb2(obj_result.getInt("ald_fl_trab2")); array_registros.add(obj_notas); } } catch (Exception e) { System.out.println("Erro no select" + e.getMessage()); } finally { obj_conexao.fecharConexao(); } return array_registros; } public void select(Aluno obj_aluno){ FacesContext mensagem = FacesContext.getCurrentInstance(); try{ String comando_sql = "Select alu_in_ra, dis_st_sigla, ald_fl_p1, ald_fl_p2, ald_fl_p3, ald_fl_trab1, ald_fl_trab2 from cad_aluno_disciplina where alu_in_ra=?"; PreparedStatement obj_sql = (PreparedStatement) obj_conexao.getConexao().prepareStatement(comando_sql); obj_sql.setInt(1, obj_aluno.getRa()); obj_sql.executeUpdate(); mensagem.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN, "Erro ao selecionar aluno!","Snif")); }catch(Exception e){ mensagem.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_FATAL, "Erro na inclusão: "+e.getMessage()," Ocoreu o erro: "+e.getMessage())); }finally{ obj_conexao.fecharConexao(); } return; } }//fecha a classe package model; import java.io.Serializable; public class Notas implements Serializable{ private static final long serialVersionUID = 1L; private int alura; private String discsigla; private float p1; private float p2; private float p3; private float trb1; private float trb2; public Notas() { } public Notas (int alura, String discsigla, float p1, float p2, float p3, float trb1, float trb2){ super(); this.alura=alura; this.discsigla=discsigla; this.p1=p1; this.p2=p2; this.p3=p3; this.trb1=trb1; this.trb2=trb2; } public int getAlura() { return alura; } public void setAlura(int alura) { this.alura = alura; } public String getDiscsigla() { return discsigla; } public void setDiscsigla(String discsigla) { this.discsigla = discsigla; } public float getP1() { return p1; } public void setP1(float p1) { this.p1 = p1; } public float getP2() { return p2; } public void setP2(float p2) { this.p2 = p2; } public float getP3() { return p3; } public void setP3(float p3) { this.p3 = p3; } public float getTrb1() { return trb1; } public void setTrb1(float trb1) { this.trb1 = trb1; } public float getTrb2() { return trb2; } public void setTrb2(float trb2) { this.trb2 = trb2; } } <p:panel header="Grafico Notas Aluno" style="width: 550px"> <p:lineChart id="linear" value="#{notasDao.aluno.alura}" var="notas" xfield="#{notas.alura}" height="300px" width="500px" style="chartStyle"> <p:chartSeries label="Prova 1" value="#{notas.p1}" /> <p:chartSeries label="Prova 2" value="#{notas.p2}" /> <p:chartSeries label="Prova 3" value="#{notas.p3}" /> <p:chartSeries label="Trabalho 1" value="#{notas.trb1}" /> <p:chartSeries label="Trabalho 2" value="#{notas.trb2}" /> </p:lineChart> </p:panel> <p:panel header="Grafico Notas" style="width: 550px"> <p:lineChart id="linear" value="#{notasDao.natas}" var="notas" xfield="#{notas.p1}" height="300px" width="500px" style="chartStyle"> <p:chartSeries label="Prova 1" value="#{notas.p1}" /> <p:chartSeries label="Prova 2" value="#{notas.p2}" /> <p:chartSeries label="Prova 3" value="#{notas.p3}" /> <p:chartSeries label="Trabalho 1" value="#{notas.trb1}" /> <p:chartSeries label="Trabalho 2" value="#{notas.trb2}" /> </p:lineChart> </p:panel>

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  • How do I escape reserved words used as column names? MySQL/Create Table

    - by acidzombie24
    I am generating tables from classes in .NET and one problem is a class may have a field name key which is a reserved MySQL keyword. How do I escape it in a create table statement? (Note: The other problem below is text must be a fixed size to be indexed/unique) create table if not exists misc_info ( id INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL, key TEXT UNIQUE NOT NULL, value TEXT NOT NULL)ENGINE=INNODB;

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  • pls give reason why this java program always comes to the else part

    - by Anbu
    public class Test { public static void main(String[] args){ if (5.0 5) // (5.0<5) for both case it is going to else System.out.println("5.0 is greater than 5"); else System.out.println("else part always comes here"); /another sample/ if (5.0 == 5) System.out.println("equals"); else System.out.println("not equal"); } } can any one explain the first "if statement" why it always come to else part

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