如何在Grails中指定默认事务隔离级别 [英] How to specify default transaction isolation level in Grails

问题描述

我无法弄清楚如何在Grails应用程序中指定默认的事务隔离级别。请帮助并指出我的错误所在。以下是详细信息。

Grails：1.3.7

数据库：Sql Server 2008。

DataSource.groovy：

  dataSource {
 ... 
 driverClassName =net.sourceforge.jtds.jdbc.Driver
 dialect = org.hibernate.dialect.SQLServerDialect 
 defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED 
} 
 
 hibernate {
 ... 
 connection.isolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED 
} 
  

然后我浏览应用程序并同时执行以下查询：

  SELECT session_id，host_name，program_name，login_name，status，transaction_isolation_level 
 FROM sys.dm_exec_sessions 
 WHERE host_name IS NOT NULL AND login_name ='cm'
 ORDER BY host_name，program_name 
  

返回：

  session_id host_name pro gram_name login_name status transaction_isolation_level 
 61 ANDREYK -WS jTDS cm运行2 
  

<2>表示READ_COMMITTED。我希望看到1，即READ_UNCOMMITTED。

如果我明确指定：
@Transactional（isolation = Isolation.READ_UNCOMMITTED）

上面的查询按预期返回1。
但是我不想在我的应用程序中引用所有的服务。
我缺少什么？

解决方案

这需要在数据源配置即

  dataSource {
 ... 
 driverClassName =net.sourceforge.jtds.jdbc.Driver。 
 dialect = org.hibernate.dialect.SQLServerDialect 
 properties {
 defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED。 
} 
} 
  

I cannot figure out how to specify default transaction isolation level in Grails application . Please help and point where my mistake is. Following are the details.

Grails: 1.3.7

Database: Sql Server 2008.

DataSource.groovy:

dataSource {
  ...
  driverClassName = "net.sourceforge.jtds.jdbc.Driver"
  dialect = org.hibernate.dialect.SQLServerDialect
  defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED
}

hibernate {
  ...
  connection.isolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED
}

Then I'm navigating through the application and execute the following query at the same time:

SELECT session_id, host_name, program_name, login_name, status, transaction_isolation_level
FROM sys.dm_exec_sessions
WHERE host_name IS NOT NULL AND login_name = 'cm'
ORDER BY host_name, program_name

that returns:

session_id  host_name   program_name    login_name  status  transaction_isolation_level
61          ANDREYK-WS  jTDS            cm          running 2

2 means READ_COMMITTED. I expect to see 1, i.e. READ_UNCOMMITTED.

If I explicitly specify: @Transactional(isolation=Isolation.READ_UNCOMMITTED)

The query above returns 1 as expected. However I do not want to attribute all the services in my application. What am I missing?

解决方案

This needs to be set under the properties attribute of the datasource configuration i.e.

dataSource {
  ...
  driverClassName = "net.sourceforge.jtds.jdbc.Driver".
  dialect = org.hibernate.dialect.SQLServerDialect
  properties {
    defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED.
  }
}

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