Can anyone help me here. I want to call an oracle function in Spring+hibernate application.
How this can be done.
Eg: Oracle Function olddata(Varchar2 serialNumber)
This returns set of records having xyz fields. I need to call this function in hibernate using HQL. Also, the function have 2 tables in it using join and records are fetched from both these tables.
Regards,
Parichaya
I think this blog exactly describes what you need. (Basically you need to create your own Hibernate dialect - which sounds scary at first but not a big deal actually).
Related
is there any method for inserting new record or update when record exists in database using DB facade ?
Note: there is no model but only a controller , so using model related methods is impossible.my question is regards to query builder
The most straightforward approach is to look into your database's syntax for upserting. It will be different depending on the database and the specific situation, and may require defining a UNIQUE key of some kind.
Here is an example for MySQL:
INSERT INTO table (a,b,c) VALUES (1,2,3)
ON DUPLICATE KEY UPDATE c=c+1;
By the way, the more idiomatic approach would be to define a model. Model's allow you to handle this situation more gracefully and (in many cases) prevent you from tying your code to a specific RDBMS.
In a dao class implementation,I want to use different sql query depending upon the underlying database. Since my SQL query is complex which selects from a database view and uses "UNION" key word and uses database specific functions, I can not use JPQL (or HQL). I did some search on Stackoverflow and threads suggest the good way would be to find out the dialect used in the application. Can anyone provide some code example?
EDIT : My apologies, I did not explain my question well enough. In my dao class implementation , I want to determine the database ( say mysql or oracle) on which my application is running and then execute the appropriate query. I need the code like jdbcTemplate.findOutTheDialect().
JPA have the native queries for that.
An example you can find here.
You can use spring JdbcTemplate to connect and query from your database.
For Example..
String query = "SELECT COUNTRY_NAME FROM COUNTRY WHERE MCC_COUNTRY NOT IN ('Reserved') ORDER BY COUNTRY_NAME";
jdbcTemplate.query(query, new ObjectRowMapper());
Where "ObjectRowMapper" will be a class to map return resultset to list of Objects.
I am struggling a bit on what probably is a simple matter or something I misunderstand... But anyway, using Linq entity code first, I am trying to keep some of my tables to be inaccessible from the client, without success.
Using Breeze, I have made a datacontext that holds only the dbsets I want exposed, fine.
But when I write a query using .expand(). For example, let's say I have a posts table which I want to expose, and an Owner table that I want to hide.
Using a query like:
var query = EntityQuery
.from('Posts')
.expand('Owner');
I can still see all the columns from Owner.
So the question is: in Linq, how am I supposed to secure/protect/hide the tables, and/or specific columns, that I want to hide?
After some digging, all I have found is the [JsonIgnore] attribute, which seems insufficient to me.
What is the best way to do this? I feel I am missing something probably huge here, but it's the end of the day around here...
Thanks
If you are using the Breeze's WebApi implementation then Breeze also supports ODataQueryOptions ( see here and here ).
This allows you to mark up your controller methods so as to limit how the query is interpreted. For example, to only allow filtering on your 'Posts' query and therefore exclude the ability to "expand" or "select" 'Owners' from any 'Posts' request you could do the following.
[Queryable(AllowedQueryOptions=AllowedQueryOptions.Filter| AllowedQueryOptions.Top | AllowQueryOptions.Skip)]
public IQueryable<Posts> Posts() {
....
}
Ok apparently my question was already addressed here:
Risks of using OData and IQueryable
I just found it.
As far as I know, all QuickBase API calls are called using the following syntax: http://<quickbase>/db/<dbid>?
Is there a way to get the dbid field without navigating to that database table within QuickBase?
If the above is not possible, would anyone recommend anything other than creating another table that stores the IDs of the tables you want?
With the latter method, I believe I would only need to store one dbid and could pull down the rest (which I believe would still need to be user entered, but would be better than requiring them to change the code).
Thanks for the help!
API_GetSchema will return the list of dbids.
https://www.quickbase.com/db/<yourApplicationId>?act=API_GetSchema&apptoken=<yourApplicationTokenId>&fmt=flat
I am trying to replicate something that would be simple with a stored procedure.
I have a set of tables like so:
acem__main
acem__child
beta__main
beta_child
xyz__main
xyz__child
In my edmx, I have the acem_main and acem_child linked via a primary/secondary key.
However depending on who logs in I would like to utilise the data of either acem, beta or xyz.
I cannot imagine how to fit this into linq - can anyone help please?
Create a method that returns an IEnumerable and take a user as arguments. In the method, create three Linq queries for acem, beta or xyz and return the result from the query that correspond to the given user.