问题描述
如何在休眠"字段中设置默认值?
How do I set a default value in Hibernate field?
推荐答案
如果要使用真实的数据库默认值,请使用columnDefinition
:
If you want a real database default value, use columnDefinition
:
@Column(name = "myColumn", nullable = false, columnDefinition = "int default 100")
请注意,columnDefinition
中的字符串与数据库有关.同样,如果选择此选项,则必须使用dynamic-insert
,因此Hibernate
不会在插入时包括具有null
值的列.否则,谈论默认值是无关紧要的.
Notice that the string in columnDefinition
is database dependent. Also if you choose this option, you have to use dynamic-insert
, so Hibernate
doesn't include columns with null
values on insert. Otherwise talking about default is irrelevant.
但是,如果您不希望数据库默认值,而只是Java代码中的默认值,只需像这样初始化变量-private Integer myColumn = 100;
But if you don't want database default value, but simply a default value in your Java code, just initialize your variable like that - private Integer myColumn = 100;
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