)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult(SqlMapClientTemplate.java:204)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:243)
at data.SqlMapClientTestDao.getAll(SqlMapClientTestDao.java:25)
at service.Main.run(Main.java:37)
at service.Main.main(Main.java:55)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2621)
at com.mysql.jdbc.Connection.init(Connection.java:1485)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at
org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)
at
org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)
at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:771)
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at
org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at
org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:178)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult(SqlMapClientTemplate.java:204)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:243)
at data.SqlMapClientTestDao.getAll(SqlMapClientTestDao.java:25)
at service.Main.run(Main.java:37)
at service.Main.main(Main.java:55)
- Original Message - From: Sven Boden [EMAIL PROTECTED]
To: user-java@ibatis.apache.org
Sent: Wednesday, April 19, 2006 4:48 PM
Subject: Re: cacheModel - Database Down and external app flush
For 1):
do you have the full nested stacktrace? Did you deactivate the ping
query? and are you sure the exception originates in iBATIS (we'll see
from the full stacktrace). The intention of a cache is to speed
things up, it's not the intention to have a complete in-core database.
For 2)
There's no way for iBATIS to be automatically aware of updates by
other applications. This is a problem for every database application,
not just iBATIS. If you would develop an application without iBATIS
(with your own developed caching), how would you know in your
application whether another application updated your database?
Regards,
Sven
James Johnson wrote:
I have a few questions regarding iBatis cacheModel. All help is
greatly appreciated.
1) When the iBatis cacheModel is used, a connection to the database
server appears to be still required. The data has been cached, so
I'm not sure why the database server needs to be up after caching
the data.
For exapmle, I have test code that basically returns the same row of
data n times. As expected, the data is cached and remains unchanged
desipte making updates using the database command line client (i.e.
outside of my program). During the ith (1i=n) try, I shutdown the
database server. I would expect iBatis to just use the cache results
and not require the database server to be up. However, instead I get
the following error when I bring the database server down:
Exception in thread main
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not
get JDBC Connection; nested exception is
com.mysql.jdbc.CommunicationsException: Communications link failure
due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect
I would like to have mechanism that allows the application to use
cached data in the event the database server is down as it does when
the database server is up. Is the cachModel capable of providing
this functionality? Why does the database server need to be up when
iBatis is using cached results?
2) By specifying the flushOnExecute, iBatis will flush the cache
when a certian statement(s) is executed. Is there a way for iBatis
to flush the cache when anything (i.e. another application) makes an
update, insert or delete?
