可以使用Postgresql的Explain来分析Grails GORM生成的查询
我发现并使用了一个闭包，可以暂时将 hibernate.SQL 日志记录转换为 Trace，以便我可以查看生成的确切查询。不过，我希望能够自动运行 PostgresQL 的解释，而不必单独提取查询进行分析。
日志关闭： （在这里找到：http://www.intelligrape.com/blog/2011/10/21/log-sql-in-grails-for-a-piece-of-code/）
public static def execute(Closure closure) {
Logger sqlLogger = Logger.getLogger("org.hibernate.SQL");
Logger transactionLogger = Logger.getLogger("org.hibernate.transaction");
Level currentLevel = sqlLogger.level
Level transLevel = transactionLogger.level
sqlLogger.setLevel(Level.TRACE)
transactionLogger.setLevel(Level.TRACE)
def result = closure.call()
sqlLogger.setLevel(currentLevel)
transactionLogger.setLevel(transLevel)
result
}
用法：
def result
execute{
result=Dog.createCriteria().list{
eq("breed","Greyhound")
}
}
我想要的东西可以使用以类似的方式。
我可以用 Criteria 或 Hibernate.Restrictions 的子类来做这件事吗？
或者我在文档中缺少关于如何修改从 GORM 发送到数据库的 SQL 语句的内容吗？
感谢您提供任何信息。
I found and have used a closure that temporarily turns hibernate.SQL logging to Trace to allow me to see the exact queries that are generated. However I would like to be able to have PostgresQL's explain run automatically instead of having to pull out queries individually for analysis.
logging closure:
(found here: http://www.intelligrape.com/blog/2011/10/21/log-sql-in-grails-for-a-piece-of-code/)
public static def execute(Closure closure) {
Logger sqlLogger = Logger.getLogger("org.hibernate.SQL");
Logger transactionLogger = Logger.getLogger("org.hibernate.transaction");
Level currentLevel = sqlLogger.level
Level transLevel = transactionLogger.level
sqlLogger.setLevel(Level.TRACE)
transactionLogger.setLevel(Level.TRACE)
def result = closure.call()
sqlLogger.setLevel(currentLevel)
transactionLogger.setLevel(transLevel)
result
}
usage:
def result
execute{
result=Dog.createCriteria().list{
eq("breed","Greyhound")
}
}
I would like something that can be used in a similar way.
Is this something I could do with a sub-class of Criteria or Hibernate.Restrictions ?
Or is there something I'm missing in the docs on how to modify the SQL statement that is sent to the DB from GORM?
Thanks for any info.
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假设您不需要所有查询，而只需要运行时间较长的查询，您可能会发现 PostgreSQL 的“自动解释”插件很有用。
http://www.postgresql.org/docs/9.1/static/auto -解释.html
Assuming you don't want all queries, but only the longer-running ones you might find the "auto explain" add-on for PostgreSQL useful.
http://www.postgresql.org/docs/9.1/static/auto-explain.html