PL/SQL Server Pages (Web Programming with PL/SQL) Erdogan Dogdu Georgia State University Computer Science Department edogdu@cs.gsu.edu http://db.gsu.edu/~edogdu
Content Disadvantages of Web Toolkit PL/SQL Server Pages Syntax Loading PSP Pages Example
Disadvantages of Web Toolkit PL/SQL Web Toolkit (htp, htf) generates HTML code form PL/SQL programs. Generating nice web pages is difficult, you cannot author PL/SQL programs in Frontpage. Solution is PSP (next)
PL/SQL Server Pages (PSP) Author web pages using script-friendly HTML authoring tools. Drop in PL/SQL code within HTML code using scripting tag <% %>. In short: Web Toolkit: generate HTML from PL/SQL PSP: embedded PL/SQL within HTML
Syntax of PL/SQL Server Pages Same script tag syntax as in ASP and JSP: <% … %> PSP files should have .psp extension Can be as simple as an HTML page (no PL/SQL script) Specifying the scripting language <%@ page language="PL/SQL" %>
Syntax of PL/SQL Server Pages Parameter passing <%@ plsql parameter="varname" %> Returned document type <%@ page contentType="MIMEtype" %> Such as text/xml, text/plain, image/jpeg Stored procedure name <%@ page procedure="procname" %>
Loading PL/SQL Server Pages Loading psp document to Oracle loadpsp [ -replace ] -user username/password[@connect_string] [ include_file_name ... ] [ error_file_name ] psp_file_name ...
More Syntax Statements Expression Conditional blocks <% PL/SQL Statement; [ PL/SQL Statement; ] … %> Expression <%= PL/SQL Expression %> Conditional blocks <% if condition then %> [HTML code] <% else %> <% end if; %>
More Syntax Including files PL/SQL declarations <%@ include file="path name" %> PL/SQL declarations <%! PL/SQL declaration; [ PL/SQL declaration; ] ... %>
PSP Example: Grade Book First page: get_access.psp Overview: Allows login to application <%@ page language="PL/SQL" %> <%@ plsql procedure="get_access" %> <HTML> <HEAD> <TITLE>Get password</TITLE> <H1>Grade Book Access Page</H1> </HEAD> (cont. next slide)
PSP Example: Grade Book <BODY> <FORM ACTION="<%=owa_util.get_owa_service_path%>start_session" METHOD="POST"> <BR> Today is <%=to_char(sysdate, 'Day')%>, <%=to_char(sysdate, 'Dd / Mon / YYYY HH:MI AM')%> <BR><BR> (cont. next slide)
PSP Example: Grade Book <TABLE><TR> <TD><STRONG>USER ID: </STRONG></TD> <TD><INPUT TYPE="text" NAME="usid" SIZE="20" MAXLENGTH="50"></TD> </TR> <TR> <TD><STRONG>PASSWORD: </STRONG></TD> <TD><INPUT TYPE="password" NAME="passwd" SIZE="20" MAXLENGTH="50"></TD> </TR></TABLE> <INPUT TYPE="submit" VALUE=" Proceed "> <INPUT TYPE="reset" VALUE="Reset"> </FORM></BODY></HTML>
PSP Example: Grade Book
Form Processing This form processing program does not generate any HTML code. Therefore, we leave it as a PL/SQL program (start_session.sql) create or replace procedure start_session( usid in varchar2 DEFAULT NULL, passwd in varchar2 DEFAULT NULL) AS … begin select A.userid, A.password, A.lastAccess, A.authority into user_buffer, passwd_buffer, time_buffer, auth_buffer from users A where upper(A.userid)=upper(start_session.usid); end start_session;
Form Processing in PSP Example: <%@ page language="PL/SQL" %> <%@ plsql procedure="teacher_menu" %> <%@ plsql parameter="u_access" type="varchar2" default="null" %> <%@ plsql parameter="userid" type="varchar2" default="null" %> …