esercizio pl/sql e psp. lo schema create table studenti ( nome varchar2(15) not null, cognome...
TRANSCRIPT
ESERCIZIO PL/SQL e PSP
LO SCHEMA
create table studenti (
nome VARCHAR2(15) not null,
cognome VARCHAR2(15) not null,
eta NUMBER
);
COPIATE I FILES
• Copiate i files dalla pagina web del corso, oppure da ~ghelli/bdl03/esepsp/*
CREATE LO SCHEMA
• Aprite il file per guardarlo (con notepad o wordpad):– createtable.sql
• Connettetevi al server su datatop (usando sqlplus worksheet) e fategli leggere il file (fileopen...)
• Risposta:– drop table studenti– *– ERRORE alla riga 1:– ORA-00942: table or view does not exist– Creata tabella.– Creata 1 riga....
Voglio creare la pagina:
• <html><head><title>Mostra studenti</title></head> <body> <h1>Elenco studenti </h1> <table><tr> <td> <i> Cognome </i> </td> <td> <i>Nome </i> </td> </tr><tr> <td> Carto </td> <td> Lina </td> </tr><tr> <td> Mando </td> <td> Lino </td> </tr><tr> <td> Aspi </td> <td> Rina </td> </tr><tr> <td> Compi </td> <td> Tino </td> </tr> </table></body> </html>
Ecco il codice PL/SQL
create or replace PROCEDURE provapl AS begin htp.prn(' <HTML> <HEAD><TITLE>Mostra studenti
</TITLE></HEAD> <BODY> <H1>Elenco studenti </H1> <TABLE> <TR> <TD> <I>Cognome</I></TD> <TD> <I>Nome </I> </TD> </TR> ');
for studente in (select nome, cognome from studenti)
loop htp.prn(' <TR> <TD> ' || studente.cognome ); htp.prn(' </TD> <TD> ' || studente.nome ); htp.prn(' </TD> </TR> ');
end loop; htp.prn(' </TABLE> </BODY> </HTML> ');end;
Compilate provapl.sql
• Guardate provapl.sql
• Compilatelo da sqlplus worksheet
• Test:– //datatop.di.unipi.it/webdb/user.provapl
PASSARE UN PARAMETRO
create or replace PROCEDURE provaparpl ( ilCognome IN VARCHAR2) AS
begin htp.prn(' <HTML> <HEAD../HEAD> <BODY>
<H1>Elenco studenti </H1> <TABLE> <TR> <TD> <I>Cognome</I></TD> <TD> <I>Nome </I> </TD> </TR> ');
for studente in (select nome, cognome from studenti s
where s.Cognome = ilCognome) loop
htp.prn(' <TR> <TD> ‘ || studente.cognome ); htp.prn(' </TD> <TD> ‘ || studente.nome ); htp.prn(' </TD> </TR> ');
end loop; htp.prn(' </TABLE> </BODY> </HTML> ');end;
Compilate provaparpl.sql
• Guardate provaparpl.sql
• Compilatelo
• Test://datatop.di.unipi.it/webdb/user.provaparpl
Errore//da.../webdb/user.provaparpl?ilCognome=Mando
Successo//.../webdb/user.provaparpl?ilCognome=ghelli
???
Un modo più semplice
<%@ page language="PL/SQL" %><HTML><HEAD><TITLE>Mostra studenti</TITLE></HEAD><BODY> <H1>Elenco studenti </H1><TABLE> <TR> <TD> <I> Cognome </I> </TD> <TD> <I> Nome </I> </TD> </TR><% for studente in
(select nome, cognome from studenti) loop %> <TR> <TD> <%= studente.cognome %> </TD> <TD> <%= studente.nome %> </TD> </TR><% end loop; %></TABLE> </BODY> </HTML>
COMPILATE provapsp.psp
• Guardate provapsp.psp• Compilatelo da una command shell (run: cmd,
oppure accessoriescommand prompt)– cd C:\...\esepsp
– loadpsp –replace –user user/[email protected] provapsp.psp• "provapsp.psp": procedure "..." created.
• Test:– datatop.di.unipi.it/webdb/user.provapsp
Per vedere il file generato
• http://datatop.di.unipi.it/webdb
• browse
• Schema = user; premere browse
• Show: packages, procedures & functions
• provapsp
• Show Object Information (in alto a destra)
IL FILE GENERATOcreate or replace PROCEDURE provapsp AS
BEGIN NULL;htp.prn(' <HTML> <HEAD><TITLE>Mostra studenti </TITLE></HEAD> <BODY> <H1>Elenco studenti </H1> <TABLE> <TR> <TD> <I><font size=+1> Cognome </font></I> </TD> <TD> <I><font size=+1> Nome </font></I> </TD> </TR> ');for studente in (select nome, cognome from studenti)loop htp.prn(' <TR> <TD> '); htp.prn(studente.cognome); htp.prn(' </TD> <TD> '); htp.prn(studente.nome); htp.prn(' </TD> </TR> ');end loop;htp.prn(' </TABLE> </BODY> </HTML> ');END;
PARAMETRO PSP
<%@ page language="PL/SQL" %><%@ plsql parameter="ilCognome" %><HTML><HEAD><TITLE>Mostra studenti</TITLE></HEAD><BODY> <H1>Elenco studenti </H1><TABLE> <TR> <TD> <I> … </I> </TD> </TR><% for studente in
(select nome, cognome from studenti where studenti.cognome = ilCognome)
loop %> <TR> <TD> … </TD> </TR><% end loop; %></TABLE> </BODY> </HTML>
COMPILATE provaparpsp.psp
• Guardate provaparpsp.psp– cat provaparpsp.psp
• Compilatelo– loadpsp –replace –user user/[email protected] file.psp•“....psp": procedure "..." created.
TEST
• //datatop.di.unipi.it/webdb/user.provaparpl– Errore
• //da.../webdb/user.provaparpsp?ilCognome=Mando– Successo
• //.../webdb/user.provaparpl?ilCognome=– ???
ESERCIZI
• Modificate le procedure per mostrare anche l’età