Result Sets and Stored Procedure

In advance one question in general - since I never know: What actually is a result set???
Is it a cursor with a direct connection to the server-side database-data ? Or is it just a copy of the results once "loaded" by the query and delivered by the Server to the client ???
Second: I have a Stored Procedure on a MS SQL Server 2000
I try to call the stored procedure via jdbc. The last query in the Stored Proc is a query relying on local temporary tables. If I execute the stored procedure by my java-class, i get a
java.sql.SQLException: [Microsoft][SQLServer JDBC Driver]No ResultSet set was produced.
The usual "Select, Update and Insert-stuff" works fine with JDBC.
Stored Procedures WITHOUT resultset work fine too.
But this one just refuses to give me the results.
Executing the same stored procedure in 'MS SQL-QUERYANALYZER' gives me my expected results.
Any ideas?
Sven

In advance one question in general - since I never
know: What actually is a result set???
Is it a cursor with a direct connection to the
server-side database-data ? Or is it just a copy of
the results once "loaded" by the query and delivered
by the Server to the client ???The first one, more or less. It relies on the connection to retrieve the results, .. if the connection is lost, so is the data in the ResultSet.
Second: I have a Stored Procedure on a *MS SQL Server
2000*
I try to call the stored procedure via jdbc. The last
query in the Stored Proc is a query relying on local
temporary tables. If I execute the stored procedure by
my java-class, i get a
java.sql.SQLException: [Microsoft][SQLServer JDBC
Driver]No ResultSet set was produced.Have you tried a basic stored procedure that should return a ResultSet?.. maybe one that doesn't rely on the temporary tables? You may want to also check with the support for the driver you're using since that's really where the ability to use stored procedures resides.

Similar Messages

Multiple result sets from stored procedure into CachedRowSet

How can you obtain multiple sets of data from a stored procedure that returns multiple result sets, when you'd like to use CachedRowSet rather than ResultSet?
My database's stored procedures return multiple result sets, but I'm not sure how to manipulate that using CallableStatements and CachedRowSets... I read the RowSet tutorial from java.sun.com but that didn't cover the case of multiple result sets and CallablStatements.
How might I do this? Thanks a lot.

SELECT columns..
FROM table
FOR XML PATH('NodeName'),('Rootname')
Thank you for replying.
I dont have to generate XML from a query. I have to generate from a SP and that too without modifying it.
Thanks,
Tauhid
thats ok you can do like this
1. Create a table with structure same as SP resultset
2. Populate table with SP result as per below
INSERT table
EXEC SPName param1value,...
3. Add a query like below
SELECT columns..
FROM tablename
FOR XML PATH('NodeName'),('RootName')
see
http://visakhm.blogspot.com/2014/05/t-sql-tips-fun-with-for-xml-path.html
4. Use sp_send_dbmail to sent it through mail
http://msdn.microsoft.com/en-IN/library/ms190307.aspx
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Performance to fetch result set from stored procedure.

I read some of related threads, but couldn't find any good suggestions about the performance issue to fetch the result set from a stored procedure.
Here is my case:
I have a stored procedure which will return 2,030,000 rows. When I run the select part only in the dbartisan, it takes about 3 minutes, so I know it's not query problem. But when I call the stored procedure in DBArtisan in following way:
declare cr SYS_REFCURSOR;
firstname char(20);
lastname char(20);
street char(40);
city char(20);
STATE varchar2(2);
begin DISPLAY_ADDRESS(cr);
DBMS_OUTPUT.ENABLE(null);
LOOP
FETCH cr INTO firstname,lastname,street, city, state;
EXIT WHEN cr%NOTFOUND;
DBMS_OUTPUT.PUT_LINE( firstname||','|| lastname||','|| street||',' ||city||',' ||STATE);
END LOOP;
CLOSE cr;
end;
It will take about 100 minutes. When I used DBI fetchrow_array in perl code, it took about same amount of time. However, same stored procedure in sybase without using cursor, and same perl code, it only takes 12 minutes to display all results. We assume oracle has better performance. So what could be the problem here?
The perl code:
my $dbh = DBI->connect($databaseserver, $dbuser, $dbpassword,
{ 'AutoCommit' => 0,'RaiseError' => 1, 'PrintError' => 0 })
or die "couldn't connect to database: " . DBI->errstr;
open OUTPUTFILE, ">$temp_output_path";
my $rc;
my $sql="BEGIN DISPLAY_ADDRESS(:rc); END;";
my $sth = $dbh->prepare($sql) or die "Couldn't prepare statement: " . $dbh->errstr;
$sth->bind_param_inout(':rc', \$rc, 0, { ora_type=> ORA_RSET });
$sth->execute() or die "Couldn't execute statement: " . $sth->errstr;
while($address_info=$rc->fetchrow_arrayref()){
my ($firstname, $lastname, $street, $city, $STATE) = @$address_info;
print OUTPUTFILE $firstname."|".$lastname."|".$street."|".$city."|".$STATE;
$dbh->commit();
$dbh->disconnect();
close OUTPUTFILE;
Thanks!
rulin

Thanks for you reply!
1) The stored procedure has head
CREATE OR REPLACE PROCEDURE X_OWNER.DISPLAY_ADDRESS
cv_1 IN OUT SYS_REFCURSOR
AS
err_msg VARCHAR2(100);
BEGIN
--Adaptive Server has expanded all '*' elements in the following statement
OPEN cv_1 FOR
Select ...
commit;
EXCEPTION
WHEN OTHERS THEN
err_msg := SQLERRM;
dbms_output.put_line (err_msg);
ROLLBACK;
END;
If I only run select .. in DBArtisan, it display all 2030,000 rows in 3:44 minutes
2) But when call stored procedure, it will take 80-100 minutes .
3) The stored procedure is translated from sybase using migration tools, it's very simple, in sybase it just
CREATE PROCEDURE X_OWNER.DISPLAY_ADDRESS
AS
BEGIN
select ..
The select part is exact same.
4) The perl code is almost exact same, except the query sql:
sybase verson: my $sql ="exec DISPLAY_ADDRESS";
and no need bind the cursor parameter.
This is batch job, we create a file with all information, and ftp to clients everynight.
Thanks!
Rulin

Getting result set from stored procedures in database controls in weblogic

I am calling a stored procedure from database control which actually returns a result set
when i call the stored procedure like
* @jc:sql statement="call PROC4()"
ResultSet sampleProc() throws SQLException;
it gives me exception saying
"weblogic.jws.control.ControlException: Method sampleProc is DML but does not return void or int"
I would appreciate any help
Thanks,
Uma

Thanks for you reply!
1) The stored procedure has head
CREATE OR REPLACE PROCEDURE X_OWNER.DISPLAY_ADDRESS
cv_1 IN OUT SYS_REFCURSOR
AS
err_msg VARCHAR2(100);
BEGIN
--Adaptive Server has expanded all '*' elements in the following statement
OPEN cv_1 FOR
Select ...
commit;
EXCEPTION
WHEN OTHERS THEN
err_msg := SQLERRM;
dbms_output.put_line (err_msg);
ROLLBACK;
END;
If I only run select .. in DBArtisan, it display all 2030,000 rows in 3:44 minutes
2) But when call stored procedure, it will take 80-100 minutes .
3) The stored procedure is translated from sybase using migration tools, it's very simple, in sybase it just
CREATE PROCEDURE X_OWNER.DISPLAY_ADDRESS
AS
BEGIN
select ..
The select part is exact same.
4) The perl code is almost exact same, except the query sql:
sybase verson: my $sql ="exec DISPLAY_ADDRESS";
and no need bind the cursor parameter.
This is batch job, we create a file with all information, and ftp to clients everynight.
Thanks!
Rulin

Can we pass temporary result set to the procedure?

Hi,
The result set is stored in a temporary storage. Can we pass that resultset to the procedure?
Thanks and regards
Gowtham Sen.

I'm still unclear just what this result set is... Is is a table or a cursor or something else?
If you imply the physical result set of a SQL query, there is no such thing in Oracle. Oracle does not create and store a result set in memory containing the rows of the SQL SELECT. Creating such sets in memory does not scale. A single SELECT on such a database can kill the performance of the entire database by exhasuting all memory with a single large physical result set.
Oracle "results" live in the database cache (residing in the SGA). Rows (as data blocks) are paged into and out of this case as demand dictates. When PL/SQL code, for example, fetches a row, the SQL engine grabs the row from the db cache (SGA) and copies it to the PGA (the private memory area of the PL/SQL process). The row also may not yet exist in the db cache - in which case it needs a physical read from disk to get the data block containing that row into the db cache (after which it is copied to the PGA).
A PL/SQL process can do a bulk fetch - e.g. fetch a 100 rows from the SQL query/cursor at a time. In that case, a 100 rows are copied from the SGA db cache to the PGA.
At no time is there are single large unique and dedicated memory struct in the SGA that contains the complete "result set" of a SQL query.
Once you have fetched that row, that is it. Deal is done. You cannot reverse the cursor and fetch the row again. After you have fetched the last row in that cursor, you cannot pass that cursor to another process - the cursor is now empty. That other process cannot rewind the cursor and start fetching from the 1st row again. You will need to pass the SQL to that process in order for it to create its own cursor - also keeping in mind that in between the rows can have changed and that this other process could now see different results with its cursor.
If you want to create such a physical temporary result set that is consistent and re-usable, you can use a temporary table - and insert the results of the SELECT into this temp table for further processing. This temp table is session specific and is auto destroyed when the session terminates.
A comment though - it sounds like you're approaching the date warehouse processing (scrubbing, transformation and loading of data) as a row-by-row process.
That is a flawed approach. Row-by-row processing does not scale. One should deal with data sets. Especially when the volumes are large. One should also attempt to perform minimal passes through a data set. Processing a bunch of rows, then passing that rows to another process to do some processing on the same rows.. this means multiple passes through the same data. That is very inefficient performance and resource wise.

EJB 3.0 Persistence API and Stored Procedures

Does the EJB 3.0 Persistence API in any way prescribe or facilitate the use of Stored Procedure calls? Given the recent popularity of using (database) server APIs consisting of Stored Procedures that are addressed by ORM frameworks for performing the DML operations and of course the general usefulness of stored procedures for specific data related operations, there definitely is a need for clarity on using the straightforward Persistence operations in combination with calls to Stored Procedures. Can we use the Native Query for executing CallableStatements? Can we get to a Connection instance from the EntityManager? Can we easily use the results from a Stored Procedure invocation to refresh our Domain Objects - or is that all application logic in which the EntityManager cannot help us?
If the spec does not help us at this point, do you know how TopLink will deal with this topic?
Thanks for any help you can give me!
Best regards,
Lucas Jellema

I'm am also interested in a response to this post. I've just upgraded to JDeveloper 10.1.3.1 and am interested in making calls to stored procedures.
I've found examples of just creating my own session beans but it seems I would have to hard code the datasource name. Does anyone know if I can get around this using the entity manager supplied by the tool?
thanks,
Dan

"Log on failed" with ODBC and Stored Procedure

I am in the process of porting our application from CR10 to CR.NET and am having some trouble setting the log on info.
I have a report that was designed against a stored procedure and a development database. The connection at design time is ODBC to a SQL Server. At runtime I want to set the database and logon credentials to that of the production server, set the stored procedure parameters, and then display the report. No matter what I do always get "Log on failed" error.
After having considerable trouble with ApplyLogOnInfo on the tables where it seemed to not actually apply my changes, I finally found code which appeared to work elsewhere on this forum. So this is the code that I have now, but the call to VerifyDatabase on the report always throws the Log on Failed exception:-
void SomeClass::SetLogOnInfoForReportRecursively(ReportDocument^ ReportObj)
        CrystalDecisions::Shared::TableLogOnInfo^ l_pTableLogOnInfoToSet = gcnew CrystalDecisions::Shared::TableLogOnInfo();
        CrystalDecisions::Shared::ConnectionInfo^ l_pConnectionInfo = l_pTableLogOnInfoToSet->ConnectionInfo;
        l_pConnectionInfo->AllowCustomConnection = true;
        l_pConnectionInfo->ServerName = gcnew String(m_strServerName);
        l_pConnectionInfo->DatabaseName = gcnew String(m_strDatabaseName);
        l_pConnectionInfo->UserID = gcnew String(m_strUserID);
        l_pConnectionInfo->Password = gcnew String(m_strPassword);
        DbConnectionAttributes^ l_pConnectionAttributes = gcnew DbConnectionAttributes();
        l_pConnectionAttributes->Collection->Set("Database DLL", "crdb_odbc.dll");
        l_pConnectionAttributes->Collection->Set("QE_DatabaseName", String::Empty);
        l_pConnectionAttributes->Collection->Set("QE_DatabaseType", "ODBC (RDO)");
        l_pConnectionAttributes->Collection->Set("QE_SQLDB", true);
        l_pConnectionAttributes->Collection->Set("SSO Enabled", false);
        l_pConnectionInfo->Attributes = l_pConnectionAttributes;
        //main connection
        ReportObj->SetDatabaseLogon(l_pConnectionInfo->UserID, l_pConnectionInfo->Password, l_pConnectionInfo->ServerName, l_pConnectionInfo->DatabaseName, false);
        //other connections
        for each(CrystalDecisions::Shared::IConnectionInfo^ pConnection in ReportObj->DataSourceConnections)
            pConnection->SetConnection(l_pConnectionInfo->ServerName, l_pConnectionInfo->DatabaseName, l_pConnectionInfo->UserID, l_pConnectionInfo->Password);
            //pConnection->SetLogon(l_pConnectionInfo->UserID, l_pConnectionInfo->Password);
            pConnection->LogonProperties->Set("Data Source", l_pConnectionInfo->ServerName);
            pConnection->LogonProperties->Set("Initial Catalog", l_pConnectionInfo->DatabaseName);
        // Now we need to set the log on info for any subreports otherwise they will always look for the datasource they were set up with.
        if (!ReportObj->IsSubreport)
        for each (ReportDocument^ l_pSubReport in ReportObj->Subreports)
             SetLogOnInfoForReportRecursively(l_pSubReport);
        for each (CrystalDecisions::CrystalReports::Engine::Table^ l_pTable in ReportObj->Database->Tables)
            TableLogOnInfo^ l_pCurentTableLogOnInfo = l_pTable->LogOnInfo;
            l_pCurentTableLogOnInfo->ConnectionInfo = l_pTableLogOnInfoToSet->ConnectionInfo;
            l_pTable->ApplyLogOnInfo(l_pCurentTableLogOnInfo);
            if (!l_pTable->TestConnectivity())
               // handle error situation
... then the calling code
SetLogOnInfoForReportRecursively( pReportObj );
// l_Parameters contains the stored proc param name/values pairs to set at runtime
for each (KeyValuePair<String^, String^> param in l_Parameters)
        pReportObj->SetParameterValue(param.Key, param.Value);
pReportObj->VerifyDatabase();
which then fails. Can anyone see what I am doing wrong?
Thanks

Hi Paul,
Are you using CR for VS SP 13? If not you can get it here:
SAP Crystal Reports, developer version for Microsoft Visual Studio: Updates & Runtime Downloads
And MS SQL Server does not use a blank database name:
l_pConnectionAttributes->Collection->Set("QE_DatabaseName", String::Empty);
Set it to a database used in the report.
And you don't need to call .Verify, unless the reports are not up to date, which is not recommended, you should be using ReplaceConnection. ( Search for this, KBA's and posts on how to use it )
So rather that call .Verify try CRTable.TestConnectivity();
If that fails then you know your log on failed also.
Curious, if you try to preview the report it should prompt for log on info, if the Server and Database names are grayed out ( not editable ) then CR can't find the client either.
And MS recommends using the client that matches the version of SQL Server, So if 2005 and less you can use the MDAC SQL Client driver, for MS 2008 then use the SQL Native 10 or above.
Don

How can I use a Lookup task to lookup from my SQL Result set and have a join

So in my Control Flow, I have an Execute SQL Task which gets my Table result set. I then have a Foreach Loop Container that iterates through the result set and a Data Flow. The first task in the Data Flow is an OLE DB Source SQL Command that retrieves data
columns associated with my result set. I then do a Derived Column so I can SUBSTRING from one of my data columns and now I want to perform a Lookup to my Application Database.
How do I code my Lookup task to utilize my SQL Result set variable and match on it? I cannot use the GUI for the Lookup task as my Lookup has to have some JOINS in it.
Thanks for your review and am hopeful for a reply.

Can you expand on that? I'm sorry but I am new and a novice to the SSIS world and I want to do this as best I can and as efficiently as I can. Are you saying that Rajen's way suggested above is the way to go?
A little background....external data from a 3rd party client. I'v staged that external data to a SQL Server staging table. I have to try and match that data up to our database using SSN, DOB, and Gender...and if I can't match that way then I have to try
and match by Name. I need to make sure that there is only one and only one account for that match. If I cannot match and match one and only one, then I'll create rows on a DataAnomaly Table. If I do match, then I have to check and make sure that there is only
one and only one Member span for that match. Similarly handle the data anomaly and then check and make sure there is a "Diabetes" claim and similarly handle the DataAnomaly accordingly.
That's where I'm at. Sooooo are you saying to use Rajen's suggestion? I don't think I can do that because I need multiple SQL tasks and I cannot connect multiple OLE DB Source tasks.
Any help and suggestions are greatly appreciated.
Thanks.

DAC task with Informatica mapping and stored procedure (very slow)

Hello,
We have a DAC task that launch an Informatica Workflow with a simple query and stored procedure, like this:
SQL QUERY
==========================
SELECT
W_ACTIVITY_F.ROW_WID,
W_AGREE_D.AGREE_NUM,
W_PRODUCT_D.ATTRIB_51,
W_SRVREQ_D.ATTRIB_05,
W_ORG_DH.TOP_LVL_NAME,
W_ORG_D.ATTRIB_06,
W_PRODUCT_GROUPS_D.PRODUCT_LINE,
W_PRODUCT_D.PROD_NAME
FROM
W_AGREE_D,
W_SRVREQ_F,
W_ACTIVITY_F,
W_PRODUCT_D LEFT OUTER JOIN W_PRODUCT_GROUPS_D ON W_PRODUCT_D.PR_PROD_LN = W_PRODUCT_GROUPS_D.PRODUCT_LINE,
W_ORG_D,
W_SRVREQ_D,
W_ORG_DH
WHERE
W_SRVREQ_F.AGREEMENT_WID = W_AGREE_D.ROW_WID AND
W_SRVREQ_F.SR_WID = W_ACTIVITY_F.SR_WID AND
W_SRVREQ_F.PROD_WID = W_PRODUCT_D.ROW_WID AND
W_SRVREQ_F.ACCNT_WID = W_ORG_D.ROW_WID AND
W_SRVREQ_F.SR_WID = W_SRVREQ_D.ROW_WID AND
W_ORG_D.ROW_WID = W_ORG_DH.ROW_WID
STORED PROCEDURE
===========================
ConvSubProy(W_AGREE_D.AGREE_NUM,
W_PRODUCT_D.ATTRIB_51,
W_SRVREQ_D.ATTRIB_05,
W_ORG_DH.TOP_LVL_NAME,
W_ORG_D.ATTRIB_06,
W_PRODUCT_GROUPS_D.PRODUCT_LINE,
W_PRODUCT_D.PROD_NAME)
The mapping is very simple:
Source Qualifier -> Stored procedure -> Update strategy (only two ports: ROW_WID and custom column) -> Target Table
When I launch the DAC Execution Plan the corresponding task take much time (40 minuts). But when I launch the corresponding Workflow from Informatica PowerCenter Workflow Manager this only take 50 seconds... when I see the log session for the task I can see that much time is spent on the time of the updates. For example, when DAC is running the writer updates 10000 records every 6/7 minuts, but when Workflow Manager is running thw writer updates 10000 records every 8/9 seconds.
So, what happens (in the DAC) to that so much time difference? Is there a way to reduce the execution time when the task is launched from DAC?
Thanks
Best Regards
Benjamin Tey

Have you tried using bulk load type?
In Workflow Manager can you open the associated task, navigate to the mapping tab and seled the target table.
What is the value for "Target load type" and which of the following boxes are checked: Insert, Update as Update, Update as Insert, Update else Insert, Delete?

Database updation using XML and stored Procedure?

Hello,
I want to perform updation in multiple tables using XML files.Please suggest can I do updation using xml and stored procedure.
If yes then which is more efficient and takes less time.
1.Updation using xml files only
2.Updation using xml files with stored procedure.
3.Stored procedure alone.
If direct xml and stored procedure communication is possible.then please write how.
Thanks in advance for any help.

Here's a sample. The next code drop of the XSQL Servlet will make the easy-to-do from within XSQL Pages:
package package1;
import org.w3c.dom.*;
import java.sql.*;
import oracle.jdbc.driver.*;
import oracle.xml.sql.query.OracleXMLQuery;
public class Class1 extends Object {
public static void main( String[] arg ) throws Exception {
Connection conn = getConnection();
CallableStatement ocs = conn.prepareCall("begin ? := App.HotItems('PAUL'); end;");
ocs.registerOutParameter(1,OracleTypes.CURSOR);
ocs.execute();
ResultSet rs = ((OracleCallableStatement)ocs).getCursor(1);
OracleXMLQuery oxq = new OracleXMLQuery(conn,rs);
System.out.println(oxq.getXMLString());
oxq.close();
rs.close();
ocs.close();
conn.close();
public static Connection getConnection() throws Exception {
String username = "scott";
String password = "tiger";
String dburl = "jdbc:oracle:thin:@localhost:1521:xml";
String driverClass = "oracle.jdbc.driver.OracleDriver";
Driver d = (Driver)Class.forName(driverClass).newInstance();
return DriverManager.getConnection(dburl,username,password);
null

EJBs and Stored Procedures

Hello!
I want to bind an EJB (probably an BMP entity bean) to the result of a stored procedure.
Can this be done? Are there any examples? thx

You would be after the JDBC CallableStatement interface which is part of JDBC 2.0
Most of the EJB books have a chapter on JDBC which will include it, there are probably examples on the web but I'm afraid I don't know where to find them.

Why to need close the result set and statement

why to need close the result set and statement

It's best to explicitly close every ResultSet, Statement, and Connection in the narrowest scope possible.
These should be closed in a finally block.
Since each close() method throws SQLException, each one should be in an individual try/catch block to ensure that a failure to close one won't ruin the chances for all the others.
You can capture this in one nice utility class, like this:
package db;
import java.sql.*;
import java.util.ArrayList;
import java.util.Map;
import java.util.LinkedHashMap;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
* Created by IntelliJ IDEA.
* User: MD87020
* Date: Feb 16, 2005
* Time: 8:42:19 PM
* To change this template use File | Settings | File Templates.
public class DatabaseUtils
     * Logger for DatabaseUtils
    private static final Log logger = LogFactory.getLog(DatabaseUtils.class);
    /** Private default ctor to prevent subclassing and instantiation */
    private DatabaseUtils() {}
     * Close a connection
     * @param connection to close
    public static void close(Connection connection)
        try
            if ((connection != null) && !connection.isClosed())
                connection.close();
        catch (SQLException e)
            logger.error("Could not close connection", e);
     * Close a statement
     * @param statement to close
    public static void close(Statement statement)
        try
            if (statement != null)
                statement.close();
        catch (SQLException e)
            logger.error("Could not close statement", e);
     * Close a result set
     * @param rs to close
    public static void close(ResultSet rs)
        try
            if (rs != null)
                rs.close();
        catch (SQLException e)
            logger.error("Could not close result set", e);
     * Close both a connection and statement
     * @param connection to close
     * @param statement to close
    public static void close(Connection connection, Statement statement)
        close(statement);
        close(connection);
     * Close a connection, statement, and result set
     * @param connection to close
     * @param statement to close
     * @param rs to close
    public static void close(Connection connection,
                             Statement statement,
                             ResultSet rs)
        close(rs);
        close(statement);
        close(connection);
     * Helper method that maps a ResultSet into a map of columns
     * @param rs ResultSet
     * @return map of lists, one per column, with column name as the key
     * @throws SQLException if the connection fails
    public static final Map toMap(ResultSet rs) throws SQLException
        List wantedColumnNames = getColumnNames(rs);
        return toMap(rs, wantedColumnNames);
     * Helper method that maps a ResultSet into a map of column lists
     * @param rs ResultSet
     * @param wantedColumnNames of columns names to include in the result map
     * @return map of lists, one per column, with column name as the key
     * @throws SQLException if the connection fails
    public static final Map toMap(ResultSet rs, List wantedColumnNames)
        throws SQLException
        // Set up the map of columns
        int numWantedColumns    = wantedColumnNames.size();
        Map columns             = new LinkedHashMap(numWantedColumns);
        for (int i = 0; i < numWantedColumns; ++i)
            List columnValues   = new ArrayList();
            columns.put(wantedColumnNames.get(i), columnValues);
        while (rs.next())
            for (int i = 0; i < numWantedColumns; ++i)
                String columnName   = (String)wantedColumnNames.get(i);
                Object value        = rs.getObject(columnName);
                List columnValues   = (List)columns.get(columnName);
                columnValues.add(value);
                columns.put(columnName, columnValues);
        return columns;
     * Helper method that converts a ResultSet into a list of maps, one per row
     * @param rs ResultSet
     * @return list of maps, one per row, with column name as the key
     * @throws SQLException if the connection fails
    public static final List toList(ResultSet rs) throws SQLException
        List wantedColumnNames = getColumnNames(rs);
        return toList(rs, wantedColumnNames);
     * Helper method that maps a ResultSet into a list of maps, one per row
     * @param rs ResultSet
     * @param wantedColumnNames of columns names to include in the result map
     * @return list of maps, one per column row, with column names as keys
     * @throws SQLException if the connection fails
    public static final List toList(ResultSet rs, List wantedColumnNames)
        throws SQLException
        List rows = new ArrayList();
        int numWantedColumns = wantedColumnNames.size();
        while (rs.next())
            Map row = new LinkedHashMap();
            for (int i = 0; i < numWantedColumns; ++i)
                String columnName   = (String)wantedColumnNames.get(i);
                Object value = rs.getObject(columnName);
                row.put(columnName, value);
            rows.add(row);
        return rows;
      * Return all column names as a list of strings
      * @param rs query result set
      * @return list of column name strings
      * @throws SQLException if the query fails
    public static final List getColumnNames(ResultSet rs) throws SQLException
        ResultSetMetaData meta = rs.getMetaData();
        int numColumns = meta.getColumnCount();
        List columnNames = new ArrayList(numColumns);
        for (int i = 1; i <= numColumns; ++i)
            columnNames.add(meta.getColumnName(i));
        return columnNames;
}Anybody who lets the GC or timeouts or sheer luck handle their resource recovery for them is a hack and gets what they deserve.
Do a search on problems with Oracle cursors being exhausted and learn what the root cause is. That should convince you.
scsi-boy is 100% correct.
%

Help with streaming result sets and prepared statements

hi all
I create a callable statement that is capable of streaming.
statement = myConn2.prepareCall("{call graphProc(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)}",java.sql.ResultSet.TYPE_FORWARD_ONLY,
java.sql.ResultSet.CONCUR_READ_ONLY);
statementOne.setFetchSize(Integer.MIN_VALUE);
the class that contains the query is instantiated 6 times the first class streams the results beautifully and then when the second
rs = DatabaseConnect.statementOne.executeQuery();
is executed I get the following error
java.sql.SQLException: Can not use streaming results with multiple result statements
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1370)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1688)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3031)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:943)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1049)
at com.mysql.jdbc.CallableStatement.executeQuery(CallableStatement.java:589)
the 6 instances are not threaded and the result set is closed before the next query executes is there a solution to this problem it would be greatly appreciated
thanks a lot
Brian

Database resources should have the narrowed scope
possible. I don't think it's a good idea to use a
ResultSet in a UI to generate a graph. Load the data
into an object or data structure inside the method
that's doing the query and close the ResultSet in a
finally block. Use the data structure to generate
the graph.
It's an example of MVC and layering.
Ok that is my bad for not elaborating on the finer points sorry, the results are not directly streamed into the graphs from the result set. and are processed in another object and then plotted from there.
with regards to your statement in the beginning I would like to ask if you think it at least a viable option to create six connections. with that said would you be able to give estimated users using the six connections under full usage.
just a few thoughts that I want to
bounce off you if you don't mind. Closing the
statement would defeat the object of of having a
callable statement How so? I don't agree with that.
%again I apologise I assumed that since callable statements inherit from prepared statements that they would have the pre compiled sql statement functionality of prepared statements,well If you consider in the example I'm about to give maybe you will see my point at least with regards to this.
The statement that I create uses a connection and is created statically at the start of the program, every time I make a call the same statement and thus connection is used, creating a new connection each time takes up time and resources. and as you know every second counts
thanks for your thoughts
Brian.

Approval Procedures and Stored Procedures

Hi All
I have a problem with approval procedures and stored procedures.
I created an approval procedure to check if a value in the udf is selected or not . if not then a messge is produced to ask the user to select the person to approve the PO.
Biut now the problem is the PO's are linked approval templates to the error messge don't show before the approval template screen.
Please assist.
Thanks
Bongani Dlamini

Hi Gordon
The stored procedure is just for validating if the user has selected the udf value.
It is not for approval*
I created an approval template for this purpose. So my problem is when I add the Po to the system the SP doesn't kick-in and alert the user to select the person to approve the PO.
Process Flow.
User captures PO then select the value on the UDF Field ( Approver) The value selected is linked to a query which is used by the Approval Template
If this method is still not supported then please let me know .
Thanks
Bongani Dlamini

XML result set storage and stored procedures

Hi,
Is there an alternative way to store and process a large data result set from an XML document without using temporary tables in an Oracle DB? If so, how can this be implemented using stored procedures?
Additional Info:
I am planning to use a directory server as my data source and returning an XML document to the store procedure that executes a query to this server. I read somewhere that table variables can be used as an alternative, however it is not the desired option when you have large result sets due to potential performance issues. Any guidance you can provide would be appreciated. Thanks

You could have a go with XML functions, but probably, because you mentioned "large data result set", you will have to deal with it programmatically. I have read once good examples in a book called "Building Oracle XML Applications" from Steve Muench (http://www.oreilly.com/catalog/orxmlapp/), but it is a little bit dated. Nevertheless a book from Steve is worth while.

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