通用mapper中selectByExample 详解

Example example = new Example(Sku.class);
Example.Criteria criteria = example.createCriteria();
criteria.andEqualTo("id",27359021549L);
List<Sku> list = this.skuMapper.selectByExample(example);
list.get(0)就是需要的对象

Sku sku2 = new Sku();
sku2.setId(27359021549L);
List<Sku> select = this.skuMapper.select(sku2);
select.get(0)就是需要的对象

Sku sku=this.shuMapper.selectByPrimaryKey(27359021549L)
直接得到对象sku

ids.forEach(id -> {
    this.stockMapper.deleteByPrimaryKey(id);
});

Example example = new Example(Stock.class);
example.createCriteria().andIn("skuId", ids);
this.stockMapper.deleteByExample(example);