Lazy delayed loading in hibernate

Hibernate is related to lazy on the parent end of one-to-one and others-to-one queries.

Hibernate3 has the lazy attribute in the association. If it is hibernate2, it should be set outer-join = "false", then the associated object, set lazy = "true" in the class place"

First, you can set lazy in the class label of the parent to-one to solve the problem. In this way, when querying the son, no extra SQL statements will be sent.

For one-to-one, in hibernate2, because one-to-one does not have the lazy option, you can only set outer-join = "false. Hibernate3 has been added to lazy, so this problem does not occur.

In general, if you find that there is excessive SQL sending when querying your son, it must be your misuse of hibernate. Practice has proved that the above solution is feasible.