mongoTemplate andExpression的一些使用方式

https://blog.csdn.net/if_you_can_please_do/article/details/80087045

https://www.jianshu.com/p/85da9c051d70

https://blog.csdn.net/hotdust/article/details/52605990

https://www.jianshu.com/p/7ab41533bc06

.andExpression("concat('123',name)").as("link");

 .and(StringOperators.Concat.stringValue(url).concatValueOf(name)).as("link");

.and(
    ConditionalOperators.ifNull(Portfolio.KEY)
        .thenValueOf(
            StringOperators.valueOf(Portfolio.SOURCE_SYSTEM)
                .concat("_")
                .concatValueOf(Portfolio.VALUATION_DATE)))
.as(Portfolio.KEY);

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来源： https://www.cnblogs.com/tonggc1668/p/11304561.html