attribute::add (public)

 attribute::add [ -default default ] [ -min_n_values min_n_values ] \
    [ -max_n_values max_n_values ] object_type datatype pretty_name \
    pretty_plural

Defined in packages/acs-subsite/tcl/attribute-procs.tcl

wrapper for the acs_attribute.create_attribute call. Note that this procedure assumes type-specific storage.

Switches:

-default

(optional)

-min_n_values

(optional)

-max_n_values

(optional)

Parameters:

object_type
datatype
pretty_name
pretty_plural

Returns:

The attribute_id of the newly created attribute

Author:

Michael Bryzek <mbryzek@arsdigita.com>

Created:

12/2000

Partial Call Graph (max 5 caller/called nodes):

Testcases:

acs_subsite_attributes

Source code:

        set default_value $default

        # We always use type-specific storage. Grab the tablename from the
        # object_type
        if { ![db_0or1row select_table {
            select t.table_name
              from acs_object_types t
             where t.object_type = :object_type
        }] } {
            error "Specified object type \"$object_type\" does not exist"
        }

        # In OpenACS, where we care that SQL must be separate from code, we don't
        # use these annoying formatting procs on our SQL. We write out the queries in full. (ben)

        # Attribute name returned from this function will be oracle
        # friendly and is thus used as the column name
        set attribute_name [plsql_utility::generate_oracle_name $pretty_name]

        # set attr_list [list]
        # lappend attr_list [list "object_type" '$object_type']
        # lappend attr_list [list "attribute_name" '$attribute_name']
        # lappend attr_list [list "min_n_values" '$min_n_values']
        # lappend attr_list [list "max_n_values" '$max_n_values']
        # lappend attr_list [list "default_value" '$default']
        # lappend attr_list [list "datatype" '$datatype']
        # lappend attr_list [list "pretty_name" '$pretty_name']
        # lappend attr_list [list "pretty_plural" '$pretty_plural']

        # A note (by ben, OpenACS)
        # the queries are empty because they are pulled out later in db_exec_plsql

        set plsql [list]
        lappend plsql_drop [list db_exec_plsql "drop_attribute" "FOO"]
        lappend plsql [list db_exec_plsql "create_attribute" "FOO"]

        set sql_type [datatype_to_sql_type -default $default_value $table_name $attribute_name $datatype]

        lappend plsql_drop [list db_dml "drop_attr_column" "FOO"]
        lappend plsql [list db_dml "add_column" "FOO"]

        for { set i 0 } { $i < [llength $plsql] } { incr i } {
            set cmd [lindex $plsql $i]
            if { [catch $cmd err_msg] } {
                # Rollback what we've done so far. The loop contitionals are:
                #  start at the end of the plsql_drop list (Drop things in reverse order of creation)
                # execute drop statements until we reach position $i+1
                #  This position represents the operation on which we failed, and thus
                #  is not executed
                for { set inner [expr {[llength $plsql_drop] - 1}] } { $inner > $i + 1 } { incr inner -1 } {
                    set drop_cmd [lindex $plsql_drop $inner]
                    if { [catch $drop_cmd err_msg_2] } {
                        append err_msg "\nAdditional error while trying to roll back: $err_msg_2"
                        return -code error $err_msg
                    }
                }
                return -code error $err_msg
            }
        }

        return [db_string select_attribute_id {
            select a.attribute_id
              from acs_attributes a
             where a.object_type = :object_type
               and a.attribute_name = :attribute_name
        }]

Generic XQL file:

<fullquery name="attribute::add.drop_attr_column">
    <querytext>
    alter table $table_name drop column $attribute_name
  </querytext>
</fullquery>

<fullquery name="attribute::add.add_column">
    <querytext>
    alter table $table_name add $attribute_name $sql_type
  </querytext>
</fullquery>

packages/acs-subsite/tcl/attribute-procs.xql

PostgreSQL XQL file:

<fullquery name="attribute::add.drop_attribute">
    <querytext>
select acs_attribute__drop_attribute(:object_type, :attribute_name)
</querytext>
</fullquery>

<fullquery name="attribute::add.create_attribute">
    <querytext>
select acs_attribute__create_attribute (	
	'$object_type',
	'$attribute_name',
	'$datatype',
	'$pretty_name',
	'$pretty_plural',
	NULL,
	NULL,
	'$default_value',
	'$min_n_values',
	'$max_n_values',
	NULL,
	'type_specific',
	'f'
);
</querytext>
</fullquery>

packages/acs-subsite/tcl/attribute-procs-postgresql.xql

Oracle XQL file:

<fullquery name="attribute::add.drop_attribute">
    <querytext>
begin acs_attribute.drop_attribute(:object_type, :attribute_name); end;
</querytext>
</fullquery>

<fullquery name="attribute::add.create_attribute">
    <querytext>
declare
  attr_id     acs_attributes.attribute_id%TYPE;
begin
  attr_id := acs_attribute.create_attribute (	
	object_type => '$object_type',
	attribute_name => '$attribute_name',
	min_n_values => '$min_n_values',
	max_n_values => '$max_n_values',
	default_value => '$default_value',
	datatype => '$datatype',
	pretty_name => '$pretty_name',
	pretty_plural => '$pretty_plural'
  );
end;
</querytext>
</fullquery>

packages/acs-subsite/tcl/attribute-procs-oracle.xql