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. :(

Similar Messages

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Workspace: MYHOSTACCT
Username : DEVUSER1
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ID     : 42804
Name   : dynamic query test
Page   : 1
Table 1: PROJECT_LIST         (Alias = PL... Listing of Projects)
Table 2: FISCAL_YEAR          (Alias = FY... Lookup table for Fiscal Years)
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Hi Tony,
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From my test app, here is the code for my dynamic query. I've got it in a "PL/SQL function body returning sql query" region:
DECLARE
v_query      VARCHAR2(4000);
v_as         VARCHAR2(4);
v_range_from NUMBER;
v_range_to   NUMBER;
BEGIN
v_range_from := :P1_FY_FROM;
v_range_to   := :P1_FY_TO;
v_query      := 'SELECT ';
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FOR i IN v_range_from.. v_range_to LOOP
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Thanks again!
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How can I perform this kind of range join query using DPL?

How can I perform this kind of range join query using DPL?
SELECT * from t where 1<=t.a<=2 and 3<=t.b<=5
In this pdf : http://www.oracle.com/technology/products/berkeley-db/pdf/performing%20queries%20in%20oracle%20berkeley%20db%20java%20edition.pdf,
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I'm sorry, I think I've misled you. I suggested that you perform two queries and then take the intersection of the results. You could do this, but the solution to your query is much simpler. I'll correct my previous message.
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If you're concerned about efficiency, you can choose the index (i.e., choose which of these two alternatives to implement) based on which part of the query you believe will return the smallest number of results. The less entities read, the faster the query.
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--mark

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I have several underlying queries in my IR bqy(11.1.2.1). I need to be able to change column names in my final query(as the requirements keep changing constantly). Is there a way to do this without modifying the names in the original query(I don't want to create a bunch of computed items either).
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Hi vikram,
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Hi All,
I have an ApEx 4.1 app running on 11g x64 (11.2.0.1) on Windows Server 2008 x64, and I have some data integration points with a SQL Server (2005 and 2008) that I need to establish. I have configured the database link with dg4odbc and it works beautifully... I can execute queries against the SQL Server database without any problems using the database link.
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'select "PARTNO" from ' || rel_date_char || '.dbo.ProdDetails@fv where "SchedID"...
'select "PARTNO" from ' || @rel_date_char || '.dbo.ProdDetails@fv where "SchedID"...
'select "PARTNO" from @rel_date_char.dbo.ProdDetails@fv where "SchedID"...
Is there a way to do this in PL/SQL?
Thanks for any help!
-Ian C.
Edited by: 946532 on Jul 15, 2012 7:45 PM

Just did a test using passthrough:
SQL> set serveroutput on
SQL> declare
2 val varchar2(100);
3 c integer;
4 nr integer;
5 begin
6 c:= dbms_hs_passthrough.open_cursor@FREETDS_DG4ODBC_EMGTW_11_2_0_3;
7 dbms_hs_passthrough.parse@FREETDS_DG4ODBC_EMGTW_11_2_0_3 (c, 'select count(*) from EMP');
8 LOOP
9 nr:= DBMS_Hs_Passthrough.fetch_row@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c);
10 exit when nr=0;
11 dbms_hs_passthrough.get_value@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c,1,val);
12 dbms_output.put_line(val);
13 end loop;
14 dbms_hs_passthrough.close_cursor@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c);
15 end;
16 /
24576
PL/SQL procedure successfully completed.
SQL> declare
2 val varchar2(100);
3 c integer;
4 nr integer;
5 begin
6 c:= dbms_hs_passthrough.open_cursor@FREETDS_DG4ODBC_EMGTW_11_2_0_3;
7 dbms_hs_passthrough.parse@FREETDS_DG4ODBC_EMGTW_11_2_0_3 (c, 'select count(*) from dbo.EMP');
8 LOOP
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10 exit when nr=0;
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12 dbms_output.put_line(val);
13 end loop;
14 dbms_hs_passthrough.close_cursor@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c);
15 end;
16 /
24576
PL/SQL procedure successfully completed.
So all 3 ways work for me.
Edited by: kgronau on Jul 23, 2012 10:08 AM
Now using variables to perform the select:
SQL> declare
2 val varchar2(100);
3 c integer;
4 nr integer;
5 tabname varchar2(20) :='EMP';
6 ownr varchar2(20) :='dbo';
7 dbname varchar2(20) :='gateway';
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10 dbms_hs_passthrough.parse@FREETDS_DG4ODBC_EMGTW_11_2_0_3 (c, 'SELECT count(*) FROM '||dbname||'.'|| ownr || '.'||tabname||'');
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12 nr:= DBMS_Hs_Passthrough.fetch_row@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c);
13 exit when nr=0;
14 dbms_hs_passthrough.get_value@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c,1,val);
15 dbms_output.put_line(val);
16 end loop;
17 dbms_hs_passthrough.close_cursor@FREETDS_DG4ODBC_EMGTW_11_2_0_3(c);
18 end;
19 /
24576
PL/SQL procedure successfully completed.
=> instead of executing the statement using "execute Immediate" we have to use PASTHROUGH package to pass the statement to the SQL Server.
Edited by: kgronau on Jul 23, 2012 10:10 AM

Inner join query used with 7 Database tables

HI All,
In a report they used the Inner join Query with 6 Data base table..now there is a performance issue with at query.
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In that 2 database tables containing lakhs of records..
According to my knowledge it can be avoided by using secondary indexs for those 2 database tables..
and by replacing the Inner join Query with FOR ALL ENTRIES statement.
i want how to use the logic by using FORALL ENTRIES statement for this..
So, please give you proper suggestion to avoid this issue..
Thanking you.
Moderator message: Please Read before Posting in the Performance and Tuning Forum
Edited by: Thomas Zloch on Oct 16, 2011 10:27 PM

Hi,
And what do you mean with "they used"? If "SAP used" then yo will need to ask a SAP for note
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BR
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Incorrect syntax near 'r_id'.
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TheHexLord

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Hi Folks,
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UKJA@ukja102>
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3    t1.c1, t1.c2, v.cnt
4 from t1,
5    (select /*+ no_merge */ c1, count(*) as cnt
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7       group by c1) v
8 where
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2 /
PLAN_TABLE_OUTPUT
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| Id | Operation            | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT     |      |     1 |    52 |     6 (34)| 00:00:01 |
|* 1 | HASH JOIN           |      |     1 |    52 |     6 (34)| 00:00:01 |
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|   3 |   VIEW               |      |     1 |    26 |     3 (34)| 00:00:01 |
|   4 |    HASH GROUP BY     |      |     1 |    13 |     3 (34)| 00:00:01 |
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40 rows selected.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102>
UKJA@ukja102> @end
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ON employee_passwords.Employee_ID=employees.[Employee ID]
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So I get this error message
Error Executing Database Query.
[Macromedia][SQLServer JDBC Driver][SQLServer]Invalid object name 'employees.Employee ID'.
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Should be
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Passing column name inside an update query

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WHEN ID IS NULL THEN 1
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ID,
'^( *)(\+|-)?((\d*[' || SUBSTR(VALUE,1,1) || ']?\d+)|(\d+[' ||
SUBSTR(VALUE,1,1) || ']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$','i'
) THEN 1
ELSE 0
END
FROM NLS_SESSION_PARAMETERS
WHERE PARAMETER = 'NLS_NUMERIC_CHARACTERS'
Now I need to extend this query to check 10 more columns from table1. How can modify the above query to pass that 10 columns the above query.
Thanks

Got it ! Then again your syntax is incorrect... You should use correlated subquerry
UPDATE table1
   SET COL1 = 'Y'
WHERE 0 =
          (SELECT CASE
                     WHEN ID IS NULL
                     THEN
                        1
                     WHEN REGEXP_LIKE (
                             table1.id,
                                '^( *)(\+|-)?((\d*['
                             || SUBSTR (VALUE, 1, 1)
                             || ']?\d+)|(\d+['
                             || SUBSTR (VALUE, 1, 1)
                             || ']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$',
                             'i')
                     THEN
                        1
                     ELSE
                        0
                  END
             FROM NLS_SESSION_PARAMETERS
            WHERE PARAMETER = 'NLS_NUMERIC_CHARACTERS')Ok.. Use the following code
BEGIN
   FOR a IN (SELECT column_name
               FROM user_tab_columns
              WHERE table_name = 'TABLE1'           --and COLUMN_NAME in (...)
   LOOP
      EXECUTE IMMEDIATE 'UPDATE table1
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WHERE 0 =
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                     WHEN ID IS NULL
                     THEN
                        1
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                              table1.'
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                       || ',
                                ''^( *)(\+|-)?((\d*[''
                             || SUBSTR (VALUE, 1, 1)
                             || '']?\d+)|(\d+[''
                             || SUBSTR (VALUE, 1, 1)
                             || '']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$'',
                             ''i'')
                     THEN
                        1
                     ELSE
                        0
                  END
             FROM NLS_SESSION_PARAMETERS
            WHERE PARAMETER = ''NLS_NUMERIC_CHARACTERS'')';
   END LOOP;
END;
END;The following select generates the list of column you want to use
SELECT column_name
               FROM user_tab_columns
              WHERE table_name = 'TABLE1'And in loop they are using in your querry
a.column_name

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@Type
UserTable (columns) => username, canAdminDelete,canCustomerDelete,CanMerchantDelete
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when userType=2
Select * from userTable where canCustomerDelete=0
Like in this way. I know i can write three if statments and write specific query.
But this is just an example i have very big query actually.
Please give some idea.
Thanks
Niki

Hi Niki,
As per my understanding, I think the query post by Olaf is correct. It only return the results when column canAdminDelete = 0 and userTpe = 1 or column canCustomerDelete = 0 and userType = 2.
So when userType=1 and column canAdminDelete=1, how could you get the results? Could you please test the issue again based on the query post by Olaf.
If there are any misunderstanding, please elaborate the issue for further investigation.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

Deciphering column names in a join query using jdbc

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