Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You cannot simply store an object, where a string is expected.</p> <p>If we have an object <code>$o</code> of class <code>Emp</code>, and assuming that this object is implemented using hashes, than the <em>stringification</em> of that object would be something like <code>Emp=HASH(0x9bc8880)</code>. The information included in this stringification does not allow the restoration of the object from this string.</p> <p>Instead, you have to choose a serialization of the object, so that you can restore the object.</p> <p>The <a href="https://metacpan.org/module/Data%3a%3aDumper" rel="nofollow"><code>Data::Dumper</code> module</a> serializes data structures as Perl code, that can be <code>eval</code>ed to recreate the original value. The <a href="https://metacpan.org/module/Storable" rel="nofollow"><code>Storable</code> module</a> stores the data in a binary format, and might be applicable here.</p> <p>You can serialize a data structure (or object) via <code>freeze</code>, and restore it via <code>thaw</code>.</p> <pre><code>use strict; use warnings; use Storable qw(freeze thaw); use Data::Dumper; my $o = bless {a =&gt; 1, b =&gt; 2}, 'Emp'; print "&gt; Dumper representation of original ($o)\n"; print Dumper $o; print "&gt; serializing the object...\n"; my $serialized = freeze($o); print "&gt; restoring the object...\n"; my $restored = thaw($serialized); print "&gt; Dumper representation of copy ($restored)\n"; print Dumper $restored; </code></pre> <p>Output:</p> <pre><code>&gt; Dumper representation of original (Emp=HASH(0x8de78c8)) $VAR1 = bless( { 'a' =&gt; 1, 'b' =&gt; 2 }, 'Emp' ); &gt; serializing the object... &gt; restoring the object... &gt; Dumper representation of copy (Emp=HASH(0x8f5df64)) $VAR1 = bless( { 'a' =&gt; 1, 'b' =&gt; 2 }, 'Emp' ); </code></pre> <p>or similiar. Note that the restored object has a different memory location, but is equivalent otherwise.</p> <p>If you want to serialize a data structure to a file, you can use <code>store</code> and <code>retrieve</code> instead; consult the documentation for further examples.</p>
    singulars
    1. This table or related slice is empty.
    1. POhow can i store an object in perl session
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USamon
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COnow it is serialized and stored in the session file (edited in question) but when i returning the object from session returns undef
      singulars
      1. PO
      1. USpavan
    2. CO@pavan I don't use `CGI::Session` myself, but [the docs](https://metacpan.org/module/CGI::Session) are interesting. Specifically, `new` and `load` allow you to select `Storable` as the serializer instead of `Data::Dumper` (which you seem to be using). This would probably circumvent the encoding issues you might be having (although these venerable modules shouldn't have any issues). However, all I can do is to guess until we can see more of your code.
      singulars
      1. PO
      1. USamon
    3. COso what is the best way to store the session values...actullay i am from java..
      singulars
      1. PO
      1. USpavan
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload