如何在Springboot中使用elemMatch查询数组的元素，以使该数组只有一列，而该列没有字段名？

Question

The table I am having is of the following form

{ 
    "element_1": 1, 
    "element_2": 1,
    "elements":[
        "ele_1", "ele_2", "ele_3", "ele_4"
    ]
},
{ 
    "element_1":2, 
    "element_2":2, 
    "elements":[ 
        "ele_5", "ele_6", "ele_7", "ele_8"
    ]
},
{ 
    "element_1": 3,
    "element_2": 3,
    "elements": [ 
        "ele_9", "ele_10", "ele_11", "ele_12"
    ]
}

Over here I wanted to query out the document having the element ele_1 in the elements field so that on using the java command

Query query = new Query("Required Criteria");

the document which should get returned should be

{ 
    "element_1": 1, 
    "element_2": 1,
    "elements":[
        "ele_1", "ele_2", "ele_3", "ele_4"
    ]
}

I would like to mention again that the arrays in the field "elements" have no field name hence providing a key parameter while building the Criteria object is not possible. How to get the required result?

Answer 1

you can simply write :

Query query = new Query("{'elements' : 'ele_1'}");

You dont need $elemMatch