Managing multiple queries optional queries with statement and resultsets



Currently we have a java application which have many different queries and not all are ran at one particular time. Thus for each query we plan to have a new statement and resultset and close them immediately? Below is given the snippet of code for how we run a query now.We have tried to cover each query with try and catch but the problem if the query fails them the rollback is not working on the global level. How best top put them in place to ensure no memory leak too?


try{ //main try outside
//lots of inner queries run based on some logics of if else etc
//sample query of opening and closing both statement and resultsets.

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Related to : Managing multiple queries optional queries with statement and resultsets
Managing multiple queries optional queries with statement and resultsets
Programming Languages

Currently we have a java application which have many different queries and not all are ran at one particular time. Thus for each query we plan to have a new statement and resultset and close them immediately? Below is given the snippet of code for how we run a query now.We have tried to cover each query with try and catch but the problem if the query fails them the rollback is not working on the global level. How best top put them in place to ensure no memory leak too?


try{ //main try outside
//lots of inner queries run based on some logics of if else etc
//sample query of opening and closing both statement and resultsets.

how to join two ResultSets from oracle queries in java
Programming Languages

Is it possible to join two ResultSets like join two tables in Java-oracle programming? I am writing a java program which querys two different oracle databases(the databases are physically in different locations). In the program, sql1 returns ResultSet ret1;sql2 returns ResultSet ret2. Suppose ret1 has the following data:


Id item
------------
1 item1
2 item 2
3 item 3
.........

Ret2 has the following data


Id info
---------
1 info1
2 info2


I need result like this


Id item info
------------
Combining multiple SQL Queries into one statement
Programming Languages

I am looking for a way to combine multiple SQL queries to save having to keep calling the database. I have three tables, one with a clubs details, one with the club facilities and the third combines them.


Here is a simple version of the tables:


t1


id, name, city
1, curby, London
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t2


id, facility
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2, function suite
3, VIP room

t3


id, club_id, facility_id
1, 2, 1
2, 2, 3
3, 1, 2
4, 2, 2

In all of the above the firs

C# Prepared Statement and multiple queries
Programming Languages

Is it possible to execute multiple queries with the same prepared statement (same OdbcCommand object)?


Below is the code I have and is throwing the following exception: System.Data.Odbc.OdbcException was caught
Message=ERROR [07006] [IBM][CLI Driver] CLI0102E Invalid conversion. SQLSTATE=07006


...
odbcConnection = myConnection.getOdbcConnection();
odbcConnection.Open();
odbcCommand = odbcConnection.CreateCommand();
odbcTrans = odbcConnection.BeginTransaction(IsolationLevel.ReadCommitted);
odbcCommand.Transaction = odbcTrans;
try{

When optimizing database queries, what exactly is the relationship between number of queries and size of queries?
Programming Languages

To optimize application speed, everyone always advises to minimize the number of queries an application makes to the database, consolidating them into fewer queries that retrieve more wherever possible.


However, this also always comes with the caution that data transferred is still data transferred, and just because you are making fewer queries doesn't make the data transferred free.


I'm in a situation where I can over-include on the query in order to cut down the number of queries, and simply remove the unwanted data in the application code.


Is there any type of a rule of thumb on how much of a cost there is to each query, to kn

Multiple Queries in a single sql statement
Programming Languages

Hi guys,
I am not sure if this is a SQL or a PHP problem.
I am trying to create a script which allows the user to EASILY export data from inventory and related tables on serverX into a single .sql file. The file is downloaded from serverX, copied to serverY and then run as an import.
When creating the export, there are options for which tables to export, as well as options to append various update statements to the export file.
The export file is created by selecting one row at a time from each of the selected tables, each row of data is then written to the fil

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