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用了ThreadLocal，connection对象是不是只有一个？
每个线程的threadLocals中保存的都是connection对象的副本？
这样的理解是正确的么？
connection对象可以共用么？
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With ThreadLocal connection, it is not the same.Every thread keeps a copy of itself.Connection objects are generally used by a single thread. No concurrent calls across threads.
"Each thread keeps a copy of itself", why not use a connection pool to manage it?
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With ThreadLocal connection, it is not the same.
Every thread keeps a copy of itself.
Connection objects are generally used by a single thread. No concurrent calls across threads.
"Each thread keeps a copy of itself", why not use a connection pool to manage it?