|Re: Mars version: Make 'bean based TableData' the new default for table fields. [message #1546117 is a reply to message #1545943]
||Sun, 04 January 2015 18:57
| Jeremie Bresson
Registered: October 2011
Chris Monty wrote on Sun, 04 January 2015 17:36|
When renaming columns in the table page (client side), sql binds (server side) have to be renamed using "search-and-replace".
This is definitively a big limitation of the small convenience utilities and methods we provide on top of JDBC. You have exactly the same problem with Forms. (If you rename your NameField in FirstName field in a form, you need to update your SQL from "into :name" to "into :FirstName").
For big projects we use JPA (Hibernate) and do no longer rely on SQL written as String.
I have seen some project having some utilities to generate the SQL request. The developer maintains a map:
Then a small utility write the select, insert and update statements.
<database field name, ValueFieldData>
I have no idea if it scale and how complex cases are handled.
The point is: introducing Hibernate in a small project is a big overhead.
Something I have on my TODO list would be to investigate QueryDsl. I think that the Querying SQL approach would be a nice way to specify the query and we could add something to define the mapping to the Scout FormData or PageData. This way refactoring of forms or database would produce compilation errors.
Chris Monty wrote on Sun, 04 January 2015 17:36
By default, search field bind names will conflict with the table page column they were generated from. e.g. If a columns is called "name", the search field will be called "name" and the required SQL query will be "SELECT name FROM person WHERE name = :name INTO :name". Either a naming convention must be implemented, or the search field binds need to be added as NVPair()s with different bind names.
Have you read the discussion here: TablePageData and SearchForm. Maybe this is exactly what you do not like?
Notice that even with Mars, we did not deprecate the Object aproach. So you can continue to use it. (but this solution has also some problems: it is not type safe, it breaks when you change the column order in the table, ...). See the thread here:
Deprecate execLoadTableData() in table pages and the Bug 444210.
Bug 455282 is dealing with the default TableData generated in a FormData corresponding to the TableField in a form. The strucutre that is generated is near to TablePageData, but this is the only relation. Bug 455282 has nothing to do with TablePage. This bug was implemented for Mars and if you are in a Luna version you can override the old default to use the mechanism that will be the default with mars.
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