ASP.NET Web PDF Document Viewer/Editor Control Library

The <forms> element is where a majority of the authentication action can be found. The previous example was quite simple, as you only specified the loginUrl attribute on the opening element. As you might be suspecting, the <forms> element may be adorned with various attributes and subelements. As of .NET 2.0, the skeleton of the <forms> element is realized as so: <forms name="name" cookieless=UseCookie | UseUri | AutoDetect | UseDeviceProfile defaultUrl=[Url] domain=domain name loginUrl="url" protection="All | None | Encryption | Validation" timeout="30" path="/" requireSSL="true | false" slidingExpiration="true | false"> <credentials passwordFormat="Clear | SHA1 | MD5"> <user name="username" password="password"/> </credentials> </forms> While full details for each value can be found using the .NET 2.0 Framework SDK Documentation, Table 5-3 describes some (but not all) of the optional attributes of interest. Table 5-3. Attributes of the <forms> Section <forms> Attribute

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We test the function by running it on the dual table and the all_users view: utils@ORA10G> exec dbms_output.put_line( count_rows( 'dual' ) ) 1 PL/SQL procedure successfully completed. utils@ORA10G> exec dbms_output.put_line( count_rows( 'all_users' ) ) 51 PL/SQL procedure successfully completed. Now we connect back as the db_app_data user and try to run the same program for table t1: utils@ORA10G> conn db_app_data/db_app_data Connected. db_app_data@ORA10G> exec dbms_output.put_line( count_rows( 't1' ) ) BEGIN dbms_output.put_line( count_rows( 't1' ) ); END; * ERROR at line 1: ORA-00942: table or view does not exist ORA-06512: at "UTILS.COUNT_ROWS", line 6 ORA-06512: at line 1 Although db_app_data is able to select from table t1 (recall that t1 is owned by db_app_data), the function count_rows fails to find the table. A careful look at the error message (see the highlighted portion of the code) shows that the function is trying to access table t1 in the schema utils where it was originally defined. This is because when we create a procedure in definer rights mode (which is how we created this function), all objects are resolved within the scope of the definer schema at compile time. The solution is to re-create the function with invoker rights: db_app_data@ORA10G> -- re-create the procedure in invoker rights mode db_app_data@ORA10G> conn utils/utils Connected. utils@ORA10G> create or replace function count_rows( p_table_name in varchar2 ) 2 return number 3 authid current_user 4 is 5 l_count number; 6 begin 7 execute immediate 'select count(*) from ' || p_table_name into l_count; 8 return l_count; 9 end; 10 / Function created.

F# lets you define new kinds of exception objects that carry data in a conveniently accessible form. For example, here is a declaration of a new class of exceptions and a function that wraps http with a filter that catches particular cases: exception BlockedURL of string let http2 url = if url = "" then raise(BlockedURL(url)) else http url The information from F# exception values can be extracted, again using pattern matching: > try raise(BlockedURL("")) with | BlockedURL(url) -> printf "blocked! url = '%s'\n" url;; blocked! url = ''

If we now execute the function as db_app_data, it works like a charm: utils@ORA10G> conn db_app_data/db_app_data Connected. db_app_data@ORA10G> exec dbms_output.put_line( count_rows( 't1' ) ) 5 PL/SQL procedure successfully completed. Invoker rights mode is very useful in creating generic routines that need to resolve the objects with the privileges of the invoker of the routine at runtime.

This attribute specifies the name of the authorization cookie. If you do not specify a name value, .ASPXAUTH will be used as the default. Under .NET 2.0, it is now possible to make use of cookieless authentication tokens. See the next section for full details. Specifies the type of encryption, if any, to use for cookies. Specifies the amount in minutes before an authentication cookie expires. If unspecified, the default is set to 30. Specifies whether an SSL connection is required to transmit the authentication cookie.

Exception values are always subtypes of the F# type exn, an abbreviation for the .NET type System.Exception. The declaration exception BlockedURL of string is actually shorthand for defining a new F# class type BlockedURLException that is a subtype of System.Exception. Exception types can also be defined explicitly by defining new object types. You ll look more closely at object types and subtyping in s 5 and 6. Table 4-3 summarizes the exception-related language and library constructs.

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