如何使用 Criteria、MongoTemplate 和 Java 搜索不区分大小写的值？

Question

I'm currently doing:

criteria = new Criteria().andOperator(where("car.color").is(car_color),
                                      where("car_size").is(car_size))

How to make this search works for both car_color = BLUE and car_color = blue ?

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Update:

This partially works:

where("car.color").regex(car_color, "i"),

But then all values below would be updated:

BLUE
BBLUE
blue
bluee

And I want to update only what is matched in the car_color variable(case insensitive).

Answer 1

I think what you want is to pre process your string to be all caps or all lowercase. In java that's done like:

car_color.toLowerCase() or car_color.toUpperCase()

Then you know its all in caps or all in lowercase, and can compare the string appropriately

Answer 2

The solution for my problem is:

criteria = new Criteria().andOperator(where("car.color").regex("^" + car_color+ "$", "i"),
                                      where("car_size").is(car_size))