I am developing a spring batch application and using the chunk based processing.
For Reader i am using the org.springframework.batch.item.database.JdbcCursorItemReader class.
When configuring the Reader and specifying the SQL property, how can we use the combination of preparedStatementSetter to set values for an IN clause in the SQL?
My SQL:
select * from Employee where employeeId IN (,,,,,,).
How can I dynamically set the values for IN clause using preparedStatementSetter?
Related
I have to run a select SQL on DB using NamedParameterJdbcTemplate which involved 'IN' clause and since IN Clause has a limit of 1000 values I want to perform a batch select operation.
Is something similar to batchUpdate available in Spring 3.x?
In my application I am using the following #JoinFormula
#JoinFormula(value="(select s.\"Id\" from \"Student\" s where ash.\"Class_Id\" = id)" )
However, at runtime the generated query is:
(
select
s.cla0_."Id"
from
cla0_."Student" s
where
s.cla0_."Class_Id" = cla0_.id) as formula4_0_,
I need to prevent adding cla0_ table alias to the formula query. How could it be done in hibernate?
I am using it in spring boot, and postgres as database.
We have an application that uses a framework that we don't have access to it's java classes. I can just see the .class file in byte-code format. So I can't override that class. At that class we have a native query like below:
"Select col1 from table1 where col2='x'";
I mean where condition is not parametric. As well I don't have access to change the query in the code. the App uses Oracle database and Hibernate as ORM.
The question is
"Is there any way to tell Oracle or Hibernate to change this hardcoded query with a parametric one?"
I am trying to create a BI Publisher data model which runs the Oracle query below -
SELECT *
FROM audit_YYYYMM
(this should be the YYYYMM of the current date)
How do I setup a parameter default value within the datamodel to grab the YYYYMM from the SYSDATE?
How do I append this parameter within the data set SQL Query?
I tried SELECT * FROM audit_:Month_YYYYMM
(where I had a string parameter called Month_YYYMM)
This did not work.
You are going to have to use something like EXECUTE_IMMEDIATE. And you may have to make a separate PL/SQL package to launch rather than use the built in data definition stuff.
https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/executeimmediate_statement.htm
When using Spring Data JPA with Hibernate, what are the options available to write queries that join with table functions.
For example, I'd like to generate queries as described below:
CASE 1: SELECT * FROM getfoo(1) AS t1;
CASE 2: SELECT * FROM getfoo(1) x INNER JOIN tbl1 y on x.id = y.id;
Edit
To elaborate more, I'm using Spring Data for all things CRUD (It works great). However, I need to write complicated queries that join tables with "table functions". Table functions(AKA Table-Valued User-Defined Functions) are database functions that return tabled-values which can be used in the JOIN clause in combination with tables. Postgresql and Sql Server support them.
In the Spring Data realm, which includes much more than JPA, what are the options to consider when writing such queries? Whats the best practice from your experience? user2658013 was kind enough to describe one such approach using the entityManager.reateNativeQuery method.
In my mind here are the options:
JPA
Use #NamedStoredProcedureQuery ( >=JPA 2.1)
Use entityManager.createNativeQuery or #NamedNativeQuery
Non-standard
Use Spring Data's #Query to declare finder queries directly on repository methods.
Use SimpleJdbcCall
Any others?
I believe you are asking about Postgres stored functions. Postgres stored functions are analogous to "Stored Procedures". So I think you are asking how would invoke a stored procedure using JPA? Am I close?
The following pseudo code is derived from details published here (see section on Stored Procures):
http://www.oracle.com/technetwork/articles/vasiliev-jpql-087123.html
EntityManager em = emf.createEntityManager();
SOMEVAL_TYPE result = (SOMEVAL_TYPE)em.createNativeQuery("SELECT getfoo(?1) FROM SOMEDB")
.setParameter(1, SOME_PARM)
.getSingleResult();
In general you can use JPQL with JPA instead of SQL.
Note! The above assumes you have already created the stored function in you Postgres database.
Hope that helps :)