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.\" ========================================================================
.\"
.IX Title "Tangram::Cursor 3pm"
.TH Tangram::Cursor 3pm "2015-10-09" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Tangram::Cursor \- traverse a result set
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&   $cursor = $storage\->cursor($remote, $filter);
\&
\&   while (my $obj = $cursor\->current())
\&   {
\&      # process $obj
\&      $cursor\->next();
\&   }
\&
\&   $cursor\->execute();
\&
\&   while (my $obj = $cursor\->current())
\&   {
\&      # process $obj
\&      $cursor\->next();
\&   }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A Cursor makes it possible to iterate over a result set without
loading all the objects in memory.
.PP
See also the \*(L"limit\*(R" option to the select method of the
Tangram::Storage class.
.SH "INSTANCE METHODS"
.IX Header "INSTANCE METHODS"
.SS "current"
.IX Subsection "current"
.Vb 1
\&   $obj = $cursor\->current();
.Ve
.PP
Returns the current object, or \fIundef()\fR if the result set is exhausted.
.SS "next"
.IX Subsection "next"
.Vb 2
\&   $obj = $cursor\->next();
\&   @obj = $cursor\->next();
.Ve
.PP
Moves to the next object in the result set, if any. Returns the new
current object, or \fIundef()\fR if the result set is exhausted. In list
context, return all the remaining objects.
.SS "execute"
.IX Subsection "execute"
.Vb 1
\&   $cursor\->execute();
.Ve
.PP
Moves the cursor to the first object in the result set, and return it.
Note that preparing Cursors is an expensive operation, you should
reuse them if possible. \fIexecute()\fR allows just that.
.PP
\&\fIexecute()\fR may be called several times in a row, or on a Cursor that
has just been obtained from a Storage, without ill effects.
.SS "residue"
.IX Subsection "residue"
.Vb 1
\&   my @vals = $cursor\->residue();
.Ve
.PP
Returns the values of the Expr that were passed to the \f(CW\*(C`retrieve\*(C'\fR
directive of the \fIStorage::select()\fR or \fIStorage::cursor()\fR statement.
.SH "CURSORS AND CONNECTIONS"
.IX Header "CURSORS AND CONNECTIONS"
Each Cursor opens its own connection to the database.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Tangram::Storage