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int hw_modifyobject (int connection, int object_to_change, array remove, array add, int mode)
This command allows to remove, add, or modify individual attributes
of an object record. The object is specified by the Object ID
object_to_change. The first array
remove is a list of attributes to remove.
The second array add is a list of attributes
to add. In order to modify an attribute one will have to remove
the old one and add a new one. hw_modifyobject()
will always remove the attributes before it adds attributes unless
the value of the attribute to remove is not a string or array.
The last parameter determines if the modification is performed
recursively. 1 means recurive modification. If some of the objects
cannot be modified they will be skiped without notice.
hw_error() may not indicate an error though
some of the objects could not be modified.
The keys of both arrays are the attributes name. The value of each
array element can either be an array, a string or anything else.
If it is an array
each attribute value is constructed by the key of each element plus
a colon and the value of each element. If it is a string it is taken
as the attribute value. An empty string will result in a complete
removal of that attribute. If the value is neither a string nor an
array but something else, e.g. an integer, no operation at all will
be performed on the attribute. This is neccessary if you want to
to add a completely new attribute not just a new value for an existing
attribute. If the remove array contained
an empty string for that attribute, the attribute would be tried to be
removed which would fail since it doesn't exist. The following addition of
a new value for that attribute would also fail. Setting the value
for that attribute to e.g. 0 would not even try to remove it and
the addition will work.
If you would like to change the attribute 'Name' with the current
value 'books' into 'articles' you will have to create two arrays
and call hw_modifyobject().
Example 1. modifying an attribute
// $connect is an existing connection to the Hyperwave server
// $objid is the ID of the object to modify
$remarr = array("Name" => "books");
$addarr = array("Name" => "articles");
$hw_modifyobject($connect, $objid, $remarr, $addarr);
In order to delete/add a name=value pair from/to the object record just
pass the remove/add array and set the last/third parameter to an empty
array. If the attribute is the first one with that name to add, set
attribute value in the remove array to an integer.
Example 2. adding a completely new attribute
// $connect is an existing connection to the Hyperwave server
// $objid is the ID of the object to modify
$remarr = array("Name" => 0);
$addarr = array("Name" => "articles");
$hw_modifyobject($connect, $objid, $remarr, $addarr);
Note:
Multilingual attributes, e.g. 'Title', can be modified in two
ways. Either by providing the attributes value in its native
form 'language':'title' or by providing an array with elements
for each language as described above. The above example would
than be:
Note:
This will remove all attributes with the name 'Title' and adds
a new 'Title' attribute. This comes in handy if you want to
remove attributes recursively.
Note:
If you need to delete all attributes with a certain name you
will have to pass an empty string as the attribute value.
Note:
Only the attributes 'Title', 'Description' and 'Keyword' will
properly handle the language prefix. If those attributes don't carry
a language prefix, the prefix 'xx' will be assigned.
Note:
The 'Name' attribute is somewhat special. In some cases it cannot
be complete removed. You will get an error message 'Change of base
attribute' (not clear when this happens). Therefore you will always
have to add a new Name first and than remove the old one.
Note:
You may not suround this function by calls to
hw_getandlock() and hw_unlock().
hw_modifyobject() does this internally.
