I created a web service using wso2 data service. But when I try to test it it gives below error.
Below is the screenshot of the error.
You are getting this error, because you haven't defined the result of your select query. When you define a SELECT query, you are going to retrieve a resultset from the query. So you need to define the result using the output parameters.
In the Add Query page there is a section called 'Result (Output Mapping)' where you can define the resut.
Alternatively you can define the query with column names (ex: SELECT name, age from Student) and then just click on 'Generate Responses' which automatically generate the response[1].
[1]http://docs.wso2.org/display/DSS301/Generate+Response
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I had wrote query in hbm.xml file and used spring hibernate Template for select query from data base. but I want load query at run time Instead of load form hbm.xml file.
When application is running hibernate create map of query with key = "queryName" and
value = "object org.hibernate.engine.NamedSQLQueryDefinition with query string".
sample of query is
<sql-query name="findPermission">
<return alias="prm" class="Permission"/>
select {prm.*}
from permission prm
where prm.id = :prmId
</sql-query>
I want load this part from data base to change query at run time also when update this query in data base load changed query an run it.
This question don't solved with criteria. for example if above query is incorrect want to change
correct an runtime without deploy war or jar file.
<sql-query name="findPermission">
<return alias="prm" class="Permission"/>
select {prm.*}
from tb_permission prm
where prm.id = :prmId
</sql-query>
In this sample permission change to tb_permission.
I try to change Hibernate sessionFactory object and create own sessionFactory
but other created in this object similar alise and classMetaDate , ...
must be change to load and run query.
How can i do it??
You will have to rebuild the session factory every time you want to do a change, but I would suggest you to instead inline the query directly into your code like this:
session.createSQLQuery("select {prm.*} from permission prm where prm.id = :prmId")
.addReturn(Permission.class, "prm");
When you run your application in the debug mode, you can change code and the HotSwap technology of the JVM will replace the method body properly to include the new code. This way, you don't have to restart your application all the time.
I am using a single Spring JDBC update to make an update to two tables in my Postgres database. My SQL query is as follows:
UPDATE accounts SET last_transaction_amount = :transaction_amount WHERE acct_num = :acct_num; INSERT INTO transactions (transaction_amout) VALUES (:transaction_amount);
Using NamedParameterJdbcTemplate#update, I have no issue executing this query and achieving the expected results.
The transactions table generates a sequential transaction identifier, and I want to return this to my application.
I've tried passing a GeneratedKeyHolder in the update call. This is returning the error "A result was returned when none was expected". Docs link.
I've tried passing a GeneratedKeyHolder and array of column names (new String[] {"transaction_id"}). This is returning the error that the column doesn't exist. Note this method call does work to return the transaction id when I only pass the INSERT query without the preceding UPDATE query. Docs link.
How can I retrieve the generated key? Thank you!
You seem to be looking for the RETURNING clause. Assuming that the serial number is called transaction_id:
INSERT INTO transactions (transaction_amout)
VALUES (:transaction_amount)
RETURNING transaction_id;
I have a Spring Batch project running in Spring Boot that is working perfectly fine. For my reader I'm using JdbcPagingItemReader with a MySqlPagingQueryProvider.
#Bean
public ItemReader<Person> reader(DataSource dataSource) {
MySqlPagingQueryProvider provider = new MySqlPagingQueryProvider()
provider.setSelectClause(ScoringConstants.SCORING_SELECT_STATEMENT)
provider.setFromClause(ScoringConstants.SCORING_FROM_CLAUSE)
provider.setSortKeys("p.id": Order.ASCENDING)
JdbcPagingItemReader<Person> reader = new JdbcPagingItemReader<Person>()
reader.setRowMapper(new PersonRowMapper())
reader.setDataSource(dataSource)
reader.setQueryProvider(provider)
//Setting these caused the exception
reader.setParameterValues(
startDate: new Date() - 31,
endDate: new Date()
)
reader.afterPropertiesSet()
return reader
}
However, when I modified my query with some named parameters to replace previously hard coded date values and set these parameter values on the reader as shown above, I get the following exception on the second page read (the first page works fine because the _id parameter hasn't been made use of by the paging query provider):
org.springframework.dao.InvalidDataAccessApiUsageException: No value supplied for the SQL parameter '_id': No value registered for key '_id'
at org.springframework.jdbc.core.namedparam.NamedParameterUtils.buildValueArray(NamedParameterUtils.java:336)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.getPreparedStatementCreator(NamedParameterJdbcTemplate.java:374)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:192)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:199)
at org.springframework.batch.item.database.JdbcPagingItemReader.doReadPage(JdbcPagingItemReader.java:218)
at org.springframework.batch.item.database.AbstractPagingItemReader.doRead(AbstractPagingItemReader.java:108)
Here is an example of the SQL, which has no WHERE clause by default. One does get created automatically when the second page is read:
select *, (select id from family f where date_created between :startDate and :endDate and f.creator_id = p.id) from person p
On the second page, the sql is modified to the following, however it seems that the named parameter for _id didn't get supplied:
select *, (select id from family f where date_created between :startDate and :endDate and f.creator_id = p.id) from person p WHERE id > :_id
I'm wondering if I simply can't use the MySqlPagingQueryProvider sort keys together with additional named parameters set in JdbcPagingItemReader. If not, what is the best alternative to solving this problem? I need to be able to supply parameters to the query and also page it (vs. using the cursor). Thank you!
I solved this problem with some intense debugging. It turns out that MySqlPagingQueryProvider utilizes a method getSortKeysWithoutAliases() when it builds up the SQL query to run for the first page and for subsequent pages. It therefore appends and (p.id > :_id) instead of and (p.id > :_p.id). Later on, when the second page sort values are created and stored in JdbcPagingItemReader's startAfterValues field it will use the original "p.id" String specified and eventually put into the named parameter map the pair ("_p.id",10). However, when the reader tries to fill in _id in the query, it doesn't exist because the reader used the non-alias removed key.
Long story short, I had to remove the alias reference when defining my sort keys.
provider.setSortKeys("p.id": Order.ASCENDING)
had to change to in order for everything to work nicely together
provider.setSortKeys("id": Order.ASCENDING)
I had the same issue and got another possible solution.
My table T has a primary key field INTERNAL_ID.
The query in JdbcPagingItemReader was like this:
SELECT INTERNAL_ID, ... FROM T WHERE ... ORDER BY INTERNAL_ID ASC
So, the key is: in some conditions, the query didn't return results, and then, raised the error above No value supplied for...
The solution is:
Check in a Spring Batch decider element if there are rows.
If it is, continue with chunk: reader-processor-writer.
It it's not, go to another step.
Please, note that they are two different scenarios:
At the beginning, there are rows. You get them by paging and finally, there are no more rows. This has no problem and decider trick is not required.
At the beginning, there are no rows. Then, this error raised, and the decider solved it.
Hope this helps.
I am using an APACHE DERBY database, and basing my database interactions on EntityManager, and I don't want to use JDBC class to build a query to change my tables' names (i just need to put a prefix to each new user to the application, but have the same structure of tables), such as:
//em stands for EntityManager object
Query tableNamesQuery= em.createNamedQuery("RENAME TABLE SCHEMA.EMP_ACT TO EMPLOYEE_ACT");
em.executeUpdate();
// ... rest of the function's work
// The command works from the database command prompt but i don't know how to use it in a program
//Or as i know you can't change system tables data, but here's the code
Query tableNamesQuery= em.createNamedQuery("UPDATE SYS.SYSTABLES SET TABLENAME='NEW_TABLE_NAME' WHERE TABLETYPE='T'");
em.executeUpdate();
// ... rest of the function's work
My questions are :
This syntax is correct?
Will it work?
Is there any other alternative?
Should I just use the SYS.SYSTABLES and find all the tables that has 'T' as tabletype and alter their name their, will it change the access name ?
I think you're looking for the RENAME TABLE statement: http://db.apache.org/derby/docs/10.10/ref/rrefsqljrenametablestatement.html
Don't just issue update statements against the system catalogs, you will corrupt your database.
I have a MySQL Stored Procedure click here for stored procedure and calling the Procedure using Hibernate
Hibernate Code:
int ps=5;
SQLQuery query=session2.createSQLQuery("CALL AbsentReportproc(:_fromdate,:_todate)");
query.setParameter("_fromdate", fromdate);
query.setParameter("_todate", todate);
query.setFirstResult(ps*(pno-1));
query.setMaxResults(ps);
List<Object[]> empList=query.list();
when I execute above code I'm displayed with the following Error Message:
org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'limit 5' at line 1
Note:If i remove the below statement from the code,I'm displayed with all records in a single jsp Page
query.setMaxResults(ps);
Could any one give me the solution what was the Problem?
thanks...
It is clearly a jdbc driver error that you are using;
Also try this with setFetchSize , and if this doesn't work also then,
I would suggest not to get the details out of the query in chunks if you want to display them all and there is not much data and you should rather store all the data without calling this method query.setMaxResults(ps); into a collection.
And when you want to display that data in pages, then get subList in case you are using List, to break the data at the application level and then display it on your view that is jsp in this case.