tomcat 7如何保持jdbc连接永远存在

Question

I have a war that requires a permanent jdbc connection.

I've tried this (context.xml)

maxActive="100" 
maxIdle="3" 
maxWait="1000"  
minIdle="1"

But the connection still dies after a while. How can i keep a jdbc connection alive 24/7?

thanks

Answer 1

First of all: you cannot keep it alive forever

At some point something will fail / break. Be it some network interruption, some maintenance of either your software or the database or something else.

So "I want one connection that I can use whenever I need, so it will never close automatically" is not likely to happen for you.

Instead by using a connection pool, you can have: "I want to be able to get a valid and working database connection at any point in time" is quite easy to get in comparison.

Most good connection pools ( hikariCP , c3p0 , tomcat database pool, ...) support configuration options that guarantee (that is: if the database is up and the network connection works) you can get a valid connection when you need it.