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Which is better: selectById or selectByName?
Should I always use the methods that start with the word "By"? I'm not finding many (or any) tutorials that use the method that start with "By".
The method that starts with "By" doesn't show the foreign key.
From a Zend Framework point of view, there is no difference between calling selectById() or selectByName(). Both methods will retrieve the record. The only difference is you are using a named result set in the first one and an id-based result set in the second one.
Not sure where you got that idea from. SELECT * FROM table just returns all of the columns. It doesn't care what you used to access the data. If you want the foreign key, then you need to know it's name in order to select it. SELECT *, user_id FROM table... won't do that.
selectById retrieves one record at a time by its id. It doesn't return all of the columns from the table, which means you need to supply it with an identifier. This identifier is usually the primary key of the table, and can usually be found in the table's definition.
selectByName retrieves several rows at once by its name. It doesn't return all of the columns from the table. You usually don't need this type of query, unless you are using a complex query that joins many tables.
You may be looking for selectQuery(). This function does exactly what you want it to do - it returns the rows specified by a given query. In many cases this is exactly what you need (eg, INSERT INTO table VALUES (...))