last edit 2006-06-21 18:45:03 by markwest fixed wiki words

Additions:
deleteObject uses the $object to build a where clause. This is useful because one can simple parse an object directly from an input form for example to be deleted. No need to build any where clauses (and have to use pnTables).
NOTE You cannot specify an object *and* and where clause together, one must be blank. To use a where clause you should use pnTables and make object an empty array.
This function allows us to create a custom where clause. Remember to use pnTables to get the correct column names:

Deletions:
deleteObject? uses the $object to build a where clause. This is useful because one can simple parse an object directly from an input form for example to be deleted. No need to build any where clauses (and have to use pnTables?).
NOTE You cannot specify an object *and* and where clause together, one must be blank. To use a where clause you should use pnTables? and make object an empty array.
This function allows us to create a custom where clause. Remember to use pnTables? to get the correct column names:

edited 2006-06-05 15:52:52 by Chestnut small display fix

Additions:

deleteObjectByID

deleteObjectByID ($tablename, $id, $idcolumn='id')

deleteObject

deleteObject ($object, $tablename, $where='', $idcolumn='')

deleteWhere

deleteWhere ($tablename, $where)

Deletions:

deleteObjectByID?

deleteObjectByID? ($tablename, $id, $idcolumn='id')

deleteObject?

deleteObject? ($object, $tablename, $where='', $idcolumn='')

deleteWhere?

deleteWhere? ($tablename, $where)

edited 2006-05-29 10:25:22 by Chestnut Tidy fix...

Additions:
deleteObject? ($object, $tablename, $where='', $idcolumn='')

Deletions:
deleteObject? ($object, $tablename, $where=, $idcolumn='id')

Oldest known version of this page was edited on 2006-05-04 13:10:43 by markwest [ moved from temp wiki ]

Delete Operations


deleteObjectByID?


   /**
     * Delete an object by its ID.
     *
     * @param tablename   The tablename key for the PNTables structure
     * @param id          The ID of the object to delete
     * @param idcolumn    The column which contains the ID field (optional) (default='id')
     *
     * @return The result from the delete operation
     */
    function deleteObjectByID ($tablename, $id, $idcolumn='id')


deleteObjectByID? ($tablename, $id, $idcolumn='id')

This function will delete one row in the database by the id field. Two examples:

    DBUtil::deleteObjectById ('mytable', 4);
    DBUtil::deleteObjectById ('customers', $customerid, 'cust_id');


We can also cheat a little with something like this:

    DBUtil::deleteObjectById ('customers', 'USA', 'country');


This would delete multiple rows since the ID field specified is no unique. This provides a nice little shortcut.


deleteObject?


    /**
     * Generate and execute a delete SQL statement for the given object
     *
     * @param object       The object we wish to update
     * @param tablename    The tablename key for the PNTables structure
     * @param where        The where clause to use (optional) (default='')
     * @param idcolumn     The column which contains the ID field (optional) (default='id')
     *
     * @return The result from the delete operation
     */
    function deleteObject ($object, $tablename, $where='', $idcolumn='id')


deleteObject? ($object, $tablename, $where=, $idcolumn='id')

deleteObject? uses the $object to build a where clause. This is useful because one can simple parse an object directly from an input form for example to be deleted. No need to build any where clauses (and have to use pnTables?).

NOTE You cannot specify an object *and* and where clause together, one must be blank. To use a where clause you should use pnTables? and make object an empty array.

    // using an object to build the where clause
    DBUtil::deleteObject ($obj, 'customers');

    // building a where clause
    $pntables = pnDBGetTables();
    $column   = $pntables['customers_column'];
    $where    = "WHERE $column[name]='Fred' AND $column[country]='Netherlands'";
    DBUtil::deleteObject (array(), 'customers', $where);


deleteWhere?


    /**
     * Delete (an) object(s) via a where clause
     *
     * @param tablename    The tablename key for the PNTables structure
     * @param where        The where-clause to use
     *
     * @return The result from the delete operation
     */
    function deleteWhere ($tablename, $where)


deleteWhere? ($tablename, $where)

This function allows us to create a custom where clause. Remember to use pnTables? to get the correct column names:

    $pntables = pnDBGetTables();
    $column   = $pntables['customers_column'];
    $where    = "WHERE $column[name]='Fred' AND $column[country]='Netherlands'";
    DBUtil::deleteWhere ('customers', $where);


If the $where clause blank it will effectively empty the table.

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