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Oracle® Database PL/SQL Packages and Types Reference
11g Release 2 (11.2)

Part Number E16760-04
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193 OWA_UTIL

The OWA_UTIL package contains utility subprograms for performing operations such as getting the value of CGI environment variables, printing the data that is returned to the client, and printing the results of a query in an HTML table.

See Also:

For more information about implementation of this package:

This chapter contains the following topics:


Using OWA_UTIL


Overview

The OWA_UTIL package contains three types of utility subprograms.


Types

DATETYPE Data Type

The TODATE Function converts an item of this type to the type DATE, which is understood and properly handled as data by the database. The procedure CHOOSE_DATE Procedure enables the user to select the desired date.

TYPE dateType IS TABLE OF VARCHAR2(10) INDEX BY BINARY_INTEGER;

IDENT_ARR Data Type

This data type is used for an array.

TYPE ident_arr IS TABLE OF VARCHAR2(30) INDEX BY BINARY_INTEGER;

IP_ADDRESS Data Type

This data type is used by the GET_CLIENT_IP Function in the "OWA_SEC" package on .

TYPE ip_address IS TABLE OF INTEGER INDEX BY BINARY_INTEGER;

Summary of OWA_UTIL Subprograms

Table 193-1 OWA_UTIL Package Subprograms

Subprogram Description

BIND_VARIABLES Function

Prepares a SQL query and binds variables to it

CALENDARPRINT Procedures

Prints a calendar

CELLSPRINT Procedures

Prints the contents of a query in an HTML table

CHOOSE_DATE Procedure

Generates HTML form elements that allow the user to select a date

GET_CGI_ENV Function

Returns the value of the specified CGI environment variable

GET_OWA_SERVICE_PATH Function 

Returns the full virtual path for the PL/SQL Gateway

GET_PROCEDURE Function

Returns the name of the procedure that is invoked by the PL/SQL Gateway

HTTP_HEADER_CLOSE Procedure

Closes the HTTP header

LISTPRINT Procedure

Generates a HTML form element that contains data from a query

MIME_HEADER Procedure

Generates the Content-type line in the HTTP header

PRINT_CGI_ENV Procedure

Generates a list of all CGI environment variables and their values

REDIRECT_URL Procedure

Generates the Location line in the HTTP header

SHOWPAGE Procedure

Prints a page generated by the HTP and HTF packages in SQL*Plus

SHOWSOURCE Procedure

Prints the source for the specified subprogram

SIGNATURE procedure

Prints a line that says that the page is generated by the PL/SQL Agent

STATUS_LINE Procedure

Generates the Status line in the HTTP header

TABLEPRINT Function

Prints the data from a table in the database as an HTML table

TODATE Function

Converts dateType data to the standard PL/SQL date type

WHO_CALLED_ME Procedure

Returns information on the caller of the procedure.



BIND_VARIABLES Function

This function prepares a SQL query by binding variables to it, and stores the output in an opened cursor. Use this function as a parameter to a procedure sending a dynamically generated query. Specify up to 25 bind variables.

Syntax

OWA_UTIL.BIND_VARIABLES(
   theQuery       IN       VARCHAR2   DEFAULT NULL,
   bv1Name        IN       VARCHAR2   DEFAULT NULL,
   bv1Value       IN       VARCHAR2   DEFAULT NULL,
   bv2Name        IN       VARCHAR2   DEFAULT NULL,
   bv2Value       IN       VARCHAR2   DEFAULT NULL,
   bv3Name        IN       VARCHAR2   DEFAULT NULL,
   bv3Value       IN       VARCHAR2   DEFAULT NULL,
        ...
   bv25Name       IN       VARCHAR2   DEFAULT NULL,
   bv25Value      IN       VARCHAR2   DEFAULT NULL)
 RETURN INTEGER;

Parameters

Table 193-2 BIND_VARIABLES Function Parameters

Parameter Description

theQuery

The SQL query statement which must be a SELECT statement

bv1Name

The name of the variable

bv1Value

The value of the variable


Return Values

An integer identifying the opened cursor.


CALENDARPRINT Procedures

These procedures creates a calendar in HTML with a visible border. Each date in the calendar can contain any number of hypertext links.

This procedure has 2 versions.

Syntax

OWA_UTIL.CALENDARPRINT(
   p_query        IN       VARCHAR2,
   p_mf_only      IN       VARCHAR2   DEFAULT 'N');

OWA_UTIL.CALENDARPRINT(
   p_cursor       IN       INTEGER,
   p_mf_only      IN       VARCHAR2   DEFAULT 'N');

Parameters

Table 193-3 CALENDARPRINT Procedure Parameters

Parameter Description

p_query

A PL/SQL query.

p_cursor

A PL/SQL cursor containing the same format as p_query.

p_mf_only

If "N" (the default), the generated calendar includes Sunday through Saturday. Otherwise, it includes Monday through Friday only.


Usage Notes

Design your query as follows:


CELLSPRINT Procedures

This procedure generates an HTML table from the output of a SQL query. SQL atomic data items are mapped to HTML cells and SQL rows to HTML rows. You must write the code to begin and end the HTML table. There are nine versions of this procedure:

Syntax

OWA_UTIL.CELLSPRINT(
   p_colCnt          IN    INTEGER,
   p_resultTbl       IN    vc_arr,

   p_format_numbers  IN    VARCHAR2   DEFAULT NULL);

OWA_UTIL.CELLSPRINT(
   p_theQuery        IN    VARCHAR2,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL);

OWA_UTIL.CELLSPRINT(
   p_theCursor       IN    INTEGER,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  iN    VARCHAR2   DEFAULT NULL);

OWA_UTIL.CELLSPRINT(
   p_theQuery        IN    VARCHAR2,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_skip_rec        IN    NUMBER      DEFAULT 0,
   p_more_data       OUT   BOOLEAN);

OWA_UTIL.CELLSPRINT(
   p_theCursor       IN    INTEGER,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_skip_rec        IN    NUMBER     DEFAULT 0,
   p_more_data       OUT   BOOLEAN);

OWA_UTIL.CELLSPRINT(
   p_theQuery        IN    VARCHAR2,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_reccnt          OUT   NUMBER);

OWA_UTIL.CELLSPRINT(
   p_theCursor       IN    INTEGER,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_reccnt          OUT   NUMBER);

OWA_UTIL.CELLSPRINT(
   p_theQuery        IN    VARCHAR2,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_skip_rec        IN    NUMBER     DEFAULT 0,
   p_more_data       OUT   BOOLEAN
   p_reccnt          OUT   NUMBER);

OWA_UTIL.CELLSPRINT(
   p_theCursor       IN    INTEGER,
   p_max_rows        IN    NUMBER     DEFAULT 100,
   p_format_numbers  IN    VARCHAR2   DEFAULT NULL,
   p_skip_rec        IN    NUMBER     DEFAULT 0,
   p_more_data       OUT   BOOLEAN,
   p_reccnt          OUT   NUMBER);

Parameters

Table 193-4 CELLSPRINT Procedure Parameters

Parameter Description

p_query

A PL/SQL query.

p_colCnt

The number of columns in the table.

p_theQuery

A SQL SELECT statement.

p_theCursor

A cursor ID. This can be the return value from the BIND_VARIABLES Function.

p_max_rows

The maximum number of rows to print.

p_format_numbers

If the value of this parameter is not NULL, number fields are right justified and rounded to two decimal places.

p_skip_rec

The number of rows to exclude from the HTML table.

p_more_data

TRUE if there are more rows in the query or cursor, FALSE otherwise.

p_reccnt

The number of rows that have been returned by the query. This value does not include skipped rows (if any).

p_resultTbl

The index table which will contain the result of the query. Each entry in the query will correspond to one column value.


Examples

This function generates

<tr><td>QueryResultItem</td><td>QueryResultItem</td></tr>...

CHOOSE_DATE Procedure

This procedure generates three HTML form elements that allow the user to select the day, the month, and the year.

Syntax

OWA_UTIL.CHOOSE_DATE(
   p_name         IN       VARCHAR2,
   p_date         IN       DATE       DEFAULT SYSDATE);

Parameters

Table 193-5 CHOOSE_DATE Procedure Parameters

Parameter Description

p_name

The name of the form elements.

p_date

The initial date that is selected when the HTML page is displayed.


Usage Notes

Examples

<SELECT NAME="p_name" SIZE="1">
<OPTION value="01">1
     ...
<OPTION value="31">31
</SELECT>
-
<SELECT NAME="p_name" SIZE="1">
<OPTION value="01">JAN
     ...
<OPTION value="12">DEC
</SELECT>
-
<SELECT NAME="p_name" SIZE="1">
<OPTION value="1992">1992
     ...
<OPTION value="2002">2002
</SELECT>

GET_CGI_ENV Function

This function returns the value of the specified CGI environment variable.

Syntax

OWA_UTIL.GET_CGI_ENV(
   param_name       IN      VARCHAR2)
 RETURN VARCHAR2;

Parameters

Table 193-6 GET_CGI_ENV Function Parameters

Parameter Description

param_name

The name of the CGI environment variable. It is case-insensitive.


Return Values

The value of the specified CGI environment variable. If the variable is not defined, the function returns NULL.


GET_OWA_SERVICE_PATH Function

This function returns the full virtual path of the PL/SQL Gateway that is handling the request.

Syntax

OWA_UTIL.GET_OWA_SERVICE_PATH
 RETURN VARCHAR2;

Return Values

A virtual path of the PL/SQL Gateway that is handling the request.


GET_PROCEDURE Function

This function returns the name of the procedure that is being invoked by the PL/SQL Gateway.

Syntax

OWA_UTIL.GET_PROCEDURE
 RETURN VARCHAR2;

Return Values

The name of a procedure, including the package name if the procedure is defined in a package.


HTTP_HEADER_CLOSE Procedure

This procedure generates a newline character to close the HTTP header.

Syntax

OWA_UTIL.HTTP_HEADER_CLOSE;

Return Values

A newline character, which closes the HTTP header.

Usage Notes


LISTPRINT Procedure

This procedure generates an HTML selection list form element from the output of a SQL query. There are two versions of this procedure.

Syntax

OWA_UTIL.LISTPRINT(
   p_theQuery     IN       VARCHAR2,
   p_cname        IN       VARCHAR2,
   p_nsize        IN       NUMBER,
   p_multiple     IN       BOOLEAN   DEFAULT FALSE);

OWA_UTIL.LISTPRINT(
   p_theCursor    IN    INTEGER,
   p_cname        IN       VARCHAR2,
   p_nsize        IN       NUMBER,
   p_multiple     IN       BOOLEAN   DEFAULT FALSE);

Parameters

Table 193-7 LISTPRINT Procedure Parameters

Parameter Description

p_theQuery

The SQL query.

p_theCursor

The cursor ID. This can be the return value from the BIND_VARIABLES Function.

p_cname

The name of the HTML form element.

p_nsize

The size of the form element (this controls how many items the user can see without scrolling).

p_multiple

Whether multiple selection is permitted.


Usage Notes

The columns in the output of the query are handled in the following manner:

Examples

<SELECT NAME="p_cname" SIZE="p_nsize">
<OPTION SELECTED value='value_from_the_first_column'>value_from_the_second_column
<OPTION SELECTED value='value_from_the_first_column'>value_from_the_second_column
     ...
</SELECT>

MIME_HEADER Procedure

This procedure changes the default MIME header that the script returns. This procedure must come before any HTP.PRINT or HTP.PRN calls to direct the script not to use the default MIME header.

Syntax

OWA_UTIL.MIME_HEADER(
   ccontent_type    IN       VARCHAR2   DEFAULT 'text/html',
   bclose_header    IN       BOOLEAN    DEFAULT TRUE,
   ccharset         IN       VARCHAR2   DEFAULT NULL);

Parameters

Table 193-8 MIME_HEADER Procedure Parameters

Parameter Description

ccontent_type

The MIME type to generate

bclose_header

Whether or not to close the HTTP header. If TRUE, two newlines are sent, which closes the HTTP header. Otherwise, one newline is sent, and the HTTP header remains open.

ccharset

The character set to use.The character set only makes sense if the MIME type is of type 'text'. Therefore, the character set is only tagged on to the Content-Type header only if the MIME type passed in is of type 'text'. Any other MIME type, such as 'image', will not have any character set tagged on.


Examples

Content-type: <ccontent_type>; charset=<ccharset>

so that

owa_util.mime_header('text/plain', false, 'ISO-8859-4')

generates

Content-type: text/plain; charset=ISO-8859-4\n

PRINT_CGI_ENV Procedure

This procedure generates all the CGI environment variables and their values made available by the PL/SQL Gateway to the stored procedure.

Syntax

OWA_UTIL.PRINT_CGI_ENV;

Examples

This procedure generates a list in the following format:

cgi_env_var_name = value\n

REDIRECT_URL Procedure

This procedure specifies that the application server is to visit the specified URL. The URL may specify either a Web page to return or a program to execute.

Syntax

OWA_UTIL.REDIRECT_URL(
   curl           IN       VARCHAR2
   bclose_header  IN       BOOLEAN    DEFAULT TRUE);

Parameters

Table 193-9 REDIRECT_URL Function Parameters

Parameter Description

curl

The URL to visit.

bclose_header

Whether or not to close the HTTP header. If TRUE, two newlines are sent, which closes the HTTP header. Otherwise, one newline is sent, and the HTTP header remains open.


Usage Notes

This procedure must come before any HTP procedure or HTF function call.

Examples

This procedure generates

Location: <curl>\n\n

SHOWPAGE Procedure

This procedure prints out the HTML output of a procedure in SQL*Plus. The procedure must use the HTP or HTF packages to generate the HTML page, and this procedure must be issued after the HTP or HTF page-generating subprogram has been called and before any other HTP or HTF subprograms are directly or indirectly called.

Syntax

OWA_UTIL.SHOWPAGE;

Usage Notes

Examples

The output of htp procedure is displayed in SQL*Plus, SQL*DBA, or Oracle Server Manager. For example:

SQL> set serveroutput on
SQL> spool gretzky.html
SQL> execute hockey.pass("Gretzky")
SQL> execute owa_util.showpage
SQL> exit

This would generate an HTML page that could be accessed from Web browsers.


SHOWSOURCE Procedure

This procedure prints the source of the specified procedure, function, or package. If a procedure or function which belongs to a package is specified, then the entire package is displayed.

Syntax

OWA_UTIL.SHOWSOURCE (
   cname      IN     VARCHAR2);

Parameters

Table 193-10 SHOWSOURCE Procedure Parameters

Parameter Description

cname

The function or procedure whose source you want to show.



SIGNATURE procedure

This procedure generates an HTML line followed by a signature line on the HTML document. If a parameter is specified, the procedure also generates a hypertext link to view the PL/SQL source for that procedure. The link calls the SHOWSOURCE Procedure.

Syntax

OWA_UTIL.SIGNATURE;

OWA_UTIL.SIGNATURE (
   cname        IN        VARCHAR2);

Parameters

Table 193-11 SIGNATURE Procedure Parameters

Parameter Description

cname

The function or procedure whose source you want to show.


Examples

Without a parameter, the procedure generates a line that looks like the following:

This page was produced by the PL/SQL Agent on August 9, 2001 09:30.

With a parameter, the procedure generates a signature line in the HTML document that looks like the following:

This page was produced by the PL/SQL Agent on 8/09/01 09:30
View PL/SQL Source

STATUS_LINE Procedure

This procedure sends a standard HTTP status code to the client. This procedure must come before any htp.print or htp.prn calls so that the status code is returned as part of the header, rather than as "content data".

Syntax

OWA_UTIL.STATUS_LINE(
   nstatus        IN       INTEGER,
   creason        IN       VARCHAR2   DEFAULT NULL,
   bclose_header  IN       BOOLEAN    DEFAULT TRUE);

Parameters

Table 193-12 STATUS_LINE Procedure Parameters

Parameter Description

nstatus

The status code.

creason

The string for the status code.

bclose_header

Whether or not to close the HTTP header. If TRUE, two newlines are sent, which closes the HTTP header. Otherwise, one newline is sent, and the HTTP header remains open.


Examples

This procedure generates

Status: <nstatus> <creason>\n\n

TABLEPRINT Function

This function generates either preformatted tables or HTML tables (depending on the capabilities of the user's browser) from database tables.

Syntax

OWA_UTIL.TABLEPRINT(
   ctable         IN       VARCHAR2,
   cattributes    IN       VARCHAR2   DEFAULT NULL,
   ntable_type    IN       INTEGER    DEFAULT HTML_TABLE,
   ccolumns       IN       VARCHAR2   DEFAULT '*',
   cclauses       IN    VARCHAR2   DEFAULT NULL,
   ccol_aliases   IN       VARCHAR2   DEFAULT NULL,
   nrow_min       IN       NUMBER     DEFAULT 0,
   nrow_max       IN       NUMBER     DEFAULT NULL)
 RETURN BOOLEAN;

Parameters

Table 193-13 TABLEPRINT Function Parameters

Parameter Description

ctable

The database table.

cattributes

Other attributes to be included as-is in the tag.

ntable_type

How to generate the table. Specify HTML_TABLE to generate the table using <TABLE> tags or PRE_TABLE to generate the table using the <PRE> tags. These are constants:

  • HTML_TABLE CONSTANT INTEGER := 1;

  • PRE_TABLE CONSTANT INTEGER := 2;

ccolumns

A comma-delimited list of columns from ctable to include in the generated table.

cclauses

WHERE or ORDER BY clauses, which specify which rows to retrieve from the database table, and how to order them.

ccol_aliases

A comma-delimited list of headings for the generated table.

nrow_min

The first row, of those retrieved, to display.

nrow_max

The last row, of those retrieved, to display.


Return Values

Returns TRUE if there are more rows beyond the nrow_max requested, FALSE otherwise.

Usage Notes

Examples

For browsers that do not support HTML tables, create the following procedure:

CREATE OR REPLACE PROCEDURE showemps IS 
  ignore_more BOOLEAN; 
BEGIN 
  ignore_more := OWA_UTIL.TABLEPRINT('emp', 'BORDER', OWA_UTIL.PRE_TABLE); 
END;

Requesting a URL such as

http://myhost:7777/pls/hr/showemps 

returns to the following to the client:

<PRE> 
----------------------------------------------------------------- 
| EMPNO |ENAME |JOB      |MGR   |HIREDATE   | SAL | COMM | DEPTNO | 
----------------------------------------------------------------- 
| 7369| SMITH  | CLERK   | 7902 | 17-DEC-80 | 800 |      | 20 | 
| 7499| ALLEN  | SALESMAN| 7698 | 20-FEB-81 | 1600 | 300 | 30 | 
| 7521| WARD   | SALESMAN| 7698 | 22-FEB-81 | 1250 | 500 | 30 | 
| 7566| JONES  | MANAGER | 7839 | 02-APR-81 | 2975 |     | 20 | 
| 7654| MARTIN | SALESMAN| 7698 | 28-SEP-81 | 1250 | 1400| 30 | 
| 7698| BLAKE  | MANAGER | 7839 | 01-MAY-81 | 2850 |     | 30 | 
| 7782| CLARK  | MANAGER | 7839 | 09-JUN-81 | 2450 |     | 10 | 
| 7788| SCOTT  | ANALYST | 7566 | 09-DEC-82 | 3000 |     | 20 | 
| 7839| KING   | PRESIDENT |    | 17-NOV-81 | 5000 |     | 10 | 
| 7844| TURNER | SALESMAN| 7698 | 08-SEP-81 | 1500 | 0   | 30 | 
| 7876| ADAMS  | CLERK   | 7788 | 12-JAN-83 | 1100 |     | 20 | 
| 7900| JAMES  | CLERK   | 7698 | 03-DEC-81 | 950  |     | 30 | 
| 7902| FORD   | ANALYST | 7566 | 03-DEC-81 | 3000 |     | 20 | 
| 7934| MILLER | CLERK   | 7782 | 23-JAN-82 | 1300 |     | 10 | 
------------------------------------------------------------------- 
</PRE>

To view the employees in department 10, and only their employee ids, names, and salaries, create the following procedure:

CREATE OR REPLACE PROCEDURE showemps_10 IS 
 ignore_more BOOLEAN; 
begin 
 ignore_more := OWA_UTIL.TABLEPRINT
    ('EMP', 'BORDER', OWA_UTIL.PRE_TABLE, 
     'empno, ename, sal', 'WHERE deptno=10 ORDER BY empno', 
     'Employee Number, Name, Salary'); 
END; 

A request for a URL like

http://myhost:7777/pls/hr/showemps_10 

would return the following to the client:

<PRE>
------------------------------------- 
| Employee Number |Name    | Salary | 
------------------------------------- 
| 7782            | CLARK  | 2450   |
| 7839            | KING   | 5000   | 
| 7934            | MILLER | 1300   | 
------------------------------------- 
</PRE>

For browsers that support HTML tables, to view the department table in an HTML table, create the following procedure:

CREATE OR REPLACE PROCEDURE showdept IS 
 ignore_more BOOLEAN; 
BEGIN 
 ignore_more := oWA_UTIL.TABLEPRINT('dept', 'BORDER'); 
END; 

A request for a URL like

http://myhost:7777/pls/hr/showdept 

would return the following to the client:

<TABLE BORDER> 
<TR> 
<TH>DEPTNO</TH> 
<TH>DNAME</TH> 
<TH>LOC</TH> 
</TR> 
<TR> 
<TD ALIGN="LEFT">10</TD> 
<TD ALIGN="LEFT">ACCOUNTING</TD> 
<TD ALIGN="LEFT">NEW YORK</TD> 
</TR> 
<TR> 
<TD ALIGN="LEFT">20</TD> 
<TD ALIGN="LEFT">RESEARCH</TD> 
<TD ALIGN="LEFT">DALLAS</TD> 
</TR> 
<TR> 
<TD ALIGN="LEFT">30</TD> 
<TD ALIGN="LEFT">SALES</TD> 
<TD ALIGN="LEFT">CHICAGO</TD> 
</TR> 
<TR> 
<TD ALIGN="LEFT">40</TD> 
<TD ALIGN="LEFT">OPERATIONS</TD> 
<TD ALIGN="LEFT">BOSTON</TD> 
</TR> 
</TABLE> 

A Web browser would format this to look like the following table:

DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO


TODATE Function

This function converts the DATETYPE Data Type to the standard Oracle DATE type.

Syntax

OWA_UTIL.TODATE(
   p_dateArray      IN     dateType) 
 RETURN DATE;

Parameters

Table 193-14 TODATE Function Parameters

Parameter Description

p_dateArray

The value to convert.



WHO_CALLED_ME Procedure

This procedure returns information (in the form of output parameters) about the PL/SQL code unit that invoked it.

Syntax

OWA_UTIL.WHO_CALLED_ME(
   owner          OUT      VARCHAR2,
   name           OUT      VARCHAR2,
   lineno         OUT      NUMBER,
   caller_t       OUT      VARCHAR2);

Parameters

Table 193-15 WHO_CALLED_ME Procedure Parameters

Parameter Description

owner

The owner of the program unit.

name

The name of the program unit. This is the name of the package, if the calling program unit is wrapped in a package, or the name of the procedure or function if the calling program unit is a standalone procedure or function. If the calling program unit is part of an anonymous block, this is NULL.

lineno

The line number within the program unit where the call was made.

caller_t

The type of program unit that made the call. The possibilities are: package body, anonymous block, procedure, and function. Procedure and function are only for standalone procedures and functions.