Handling any query using JDBC ?

Hi there,
I was wondering if their actually exist a way of handling/processing any SELECT statement a user would enter.
ex: the user enter SELECT * FROM SCOTT.EMP;
Is it possible to retrieve using JDBC teh metadata associated with "*" ?
any help would be welcome.
Regards
Eric.

When you get back the result of a query in JDBC you get a ResultSet object.
Off of that you can obtain a ResultSetMetaData object which fully describes the result set - column names, types, scale and precision, etc. You can use that for dynamic processing of your result set, for example if you wanted to display it in a table.

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To the best of my ability to tell, the right way to use this product from within Power Query would be to use its API. Unfortunately, we don't currently support either of the methods needed to be able to authenticate with the service (OAuth 2.0 and a relatively-custom
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select *
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Hi vikram,
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Retrieving Schema details from any database using JDBC.

Hi,
We are in a process of developing a tool to extract the schema level details from any database. Following are the areas where we are facing difficulties. Please give us your valuable comments.
1.How can I get all the depending views of a particular table or vice- versa ?
2.If there is a join view in my database.How can i get the information
for all the join columns?
3. suppose the view in the database is built using some select and omit
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Hi,
We are in a process of developing a tool to extract
ct the schema level details from any database.
Following are the areas where we are facing
difficulties. Please give us your valuable comments.
1.How can I get all the depending views of a
particular table or vice- versa ?No way with JDBC. You need to create something DBMS specific
2.If there is a join view in my database.How can i get
the information for all the join columns?see 1)
3. suppose the view in the database is built using
some select and omit
Clause. how can I get those conditions using JDBC
BC ?see 1)
4.for a viewcolumn , how can I find out, it refers to
which column of a table ?see 1)
5.For a table how can I get the information about its
unique constraints and check constraintsThe DatabaseMetadata object can return that information
6.How can I check , a constraint is enabled or
disabled on any table?I don't think that this is possible with JDBC (not sure
if that information is returned from the DatabaseMetadata
object). You will need to code something DBMS specific
I think there is something with deferred constraints which
can be checked by JDBC but I'm not sure about that either
Thomas

Handling million rows using jdbc

approximately how much time would it take to use jdbc and do a simple data import from an oracle database having 500 million rows?

Without a lot more information my answer would be too long.
It is likely that something is wrong with the design of a project if it involves bring 500 million records into a running java application.
Using a 1000 byte record size it would take 19 hours just to move the data over a 100mbit ethernet connection.

Deciphering column names in a join query using jdbc

hi all....
I am making a database adapter for a generic report generater. This adapter would be forming queries involing various tables. There are two ways of doing it . I fire an sql on parent table to get the keys and then go to child table for each one of them or i form a join query to get desired result.
i want to go with the later approach where my query would be forming a join. The problem comes when table involved in this join has columns with the same name. for eg if a column "NOTE" is there in table A as well as table B on which i have a join. Resultset returns me with two "NOTE" columns and i cannot recognize which one belongs to which table.
all API calls including getString("Note") seems to be referring to the first occurence of "Note" column.
Also getTableName() and getSchemaName() APIs on resultsetMetadata doesnt return in anything in case of joins.
Any pointers would be most appreciated.
cheers
vivek

thanks for suggesting this solution ... though i had thought of the same onece .... unfortunately i cannot implement something like this coz out of the result set i have to instantiate an object hierarchy depending on the schema ....
this also puts me in a doubt whether i can use join in my case.
for eg ... .
lets say we have a customer talbe and and address table which has one to many relationship .... one contact can have multiple addresses.
Assuming a contanct "Joe Bloggs" having 3 addresses ...a query like following
select contact.firstname contactfirstname , address.streetname addressstreetname from contact , address where contact.contactid = address.contactid
this would return me 3 rows and i can also recognize various columns with their aliases ..
but i would lose an important fact that i have to create one java object for contact class and 3 instances for addresses which i have to return finally.
this means that i would like to return an object hierarchy with one contact object and 3 address object underneath it linked with contactid.
Any other suggestions after reading the complete requirement are most welcome ...sorry for not puting the entire thing at first.
i guess the only soln left is to visit contact and address table separately. :(

Database package for handling SQL queries using JDBC/ODBC bridge

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Hey
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Find out query using specific DB link

Hello,
Environment: 11G and Ksh script
Currently our Client is upgrading to new environment, so I need to find out which query in our Database use DB link to pull data from that client will be impacted.
for example,
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Thanks,
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frank wrote:
Hello,
Environment: 11G and Ksh script
Currently our Client is upgrading to new environment, so I need to find out which query in our Database use DB link to pull data from that client will be impacted.
for example,
select * from table_1@DB_link_1All our SQL are embedded in UNIX script, so I use command line to search any scripts contain '@DB_link_1' but not find anything.
is it possible to search any dynamic view or any suggestion to search inside ORACLE database to see if any query using this 'DB_link_1'? I tried 'dba_db_links' but this does not show which query is using which DB link.
Thanks,
Thomashttp://download.oracle.com/docs/cd/E11882_01/server.112/e17110/statviews_1068.htm#REFRN20053
REFERENCED_LINK_NAME VARCHAR2(128) Name of the link to the parent object (if remote)
"

Any reported problems using jdbc over a WAN?

If im trying to connect to a Database that's on a WAN will I experience any issues in using jdbc to connect and execute queries to that database?
I know problems would come up if my wan network is slow, but has jdbc been able to handle long distance database queries? timeout values?

but why?
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design pattern issues? It's just good layered design.
just doesnt make sense?Not in my opinion.
have u experienced/heard of any problems of
connecting to a database over a WAN and executing
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%

Strange results from JDBC Query using a VARRAY

Here's one for you experts:
I have a 9i release 2 db set up, to which I connect via the JDBC thin
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resultset=db.executeQuery
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The image at position 1 in the array is the image titled: 0x7465737432
The image at position 2 in the array is the image titled: 0x7465737433
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Dave,
The following should help.
1 select rawtohex('test1') val1,
2 rawtohex('test2') val2
3* from dual
SQL> /
VAL1 VAL2
7465737431 7465737432
SQL> select rawtohex('1') val1,
2 rawtohex('2') val2
3 from dual;
VA VA
31 32

Use JDBC to query data for JSP Report

Hi all,
I met a trouble when use JDBC to query data,
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found error message:
javax.servlet.jsp.JspException: rwlib-1: REP-4100: Failed to execute data source. REP-0069: Internal error JDBCPDS-62000:Invalid sign-on parameter P_JDBCPDS
javax.servlet.jsp.JspException: rwlib-1: REP-4100: Failed to execute data source.
REP-0069: Internal error
JDBCPDS-62000:Invalid sign-on parameter P_JDBCPDS
anyone know pls help me
Many thanks

As a general rule, it's a good idea to separate the
presentation (JSP and HTML) from the business rules
(database access). I know you didn't do that on the
AS/400, you had display files and business logic in
the same program (at least, we certainly do in ours),
but it's a good policy to follow in the web world.
That means, don't put your database access code in
the JSP. Other than that, it depends on the data.
If you have simple data (e.g. customer's name and
d address) then a Java bean would suffice. If you
have complex data (e.g. customer's payment history)
then a bean still might suffice. You would use an
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Is there any documentation on how to use JDBC in ALBPM?

I'm trying to connect to a DB using DriverManager class.
1) I've defined an externalResource of type SQL Database.
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//externalResourceURL is the URL of the SQL Database external resource created in 1), same for user and password
con as java.sql.Connection = DriverManager.getConnection(arg1=externalResourceURL, arg2=user, arg3=password)
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Thanks in advance

I don't know of any documentation off hand... but what are you trying to do? I haven't needed to to make a connection using the DriverClass....
If you aren't using dynamicSQL... you can just catalog the database, and make direct sql calls (not recommended)... but if you catalog it, then just an INSERT command works... or UPDATE... etc
logMessage "Starting insert."
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HTH
-Kevin

How to know if an Infobject is used in any query

Hi!!!
can somebody tell me how can i understand ( by technical name ) if an infoobject is used in any query ...in every mode:
as a basic infoobject
or in a structure of query
or to build a restrected keyfigure
or to build a rcalculated keyfigure.
table RSZELTDIR doasn't give this information.
It refers only to query, variable, structure or template,..not also to based infoobject ( infoobect without any delimitation )
i can't use the technical name to do this search in RSZELTDIR.
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Yes, Raj is right just go to the Cube/infoobject and click on where used button will show u list of queries/query elements.
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KS

Is there any way to get the query used in discoverer from backend??

Hi All,
I am new to dicoverer.
Is there any way to get the query used in discoverer from backend??
Thanks,
Sachin

Hi,
you can view the SQL from within the discoverer menu:
in desktop: View-> SQL Inspector
in Plus: Tools-> Show SQL
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How to write the given query using 'ANY ' operator

Hi,
How to write the given query using 'ANY ' operator , I dont need to fetch to grade_master table twice in database, just need to fetch within the result set.
SELECT dsg_code,dsg_name,dsg_grade FROM designation_master WHERE dsg_orgn='&&Orgn' and dsg_ctry='&&ctry'
And dsg_loc ='&&loc' And dsg_oru = '&&oru' and dsg_grade in decode('&&radio_group',
1, SELECT grd_code FROM grade_master WHERE grd_osm_code in (Select grd_osm_code FROM grade_master WHERE grd_orgn='&&Orgn' and grd_ctry='&&ctry' And grd_loc ='&&loc' And grd_oru = '&&oru' and grd_code ='&&emp_grade'),
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thanks
rincy

Hi,
One thing I understood my your issue is you want to perform, execution of query once or fetch the results sets my minimizing the number of times executions of queries. It would be hard for us to check in this way, atleast provide some temporary data and some business rules. Only I can IN, >, < (queries logical conditons on inner query)
- Pavan Kumar N
- ORACLE OCP - 9i/10g
https://www.oracleinternals.blogspot.com

Handling any query using JDBC ?

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