“cannot simultaneously fetch multiple bags”的解决方法
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2022-02-12 21:23:49
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@OneToMany(mappedBy = "customer",cascade = {CascadeType.ALL},fetch = FetchType.LAZY)
private Collection<CartItem> cartItems;
@OneToMany(mappedBy = "customer",cascade = {CascadeType.ALL},fetch = FetchType.EAGER)
private Collection<BookOrder> orders ; 在用JPA进行注释时，如果一个实体里要映射多个集合实体时，我们不能把两个集合的的FetchType设置为EAGER,此时只能设置为LAZY,否则会报：cannot simultaneously fetch multiple bags。或者我们也可以借助:@IndexColumn
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