Create a SELECT statement that retrieves data from a database table containing JSON

Looking to create a select query using JSON data

JSON data

{
  "Data": [
    {
      "Name": "Group1",
      "Fields": [
        {
          "Field": "EmployeeSCP.Salary",
          "Operator": "lt",
          "Value": "50000"
        }
      ],
      "Condition": "0"
    },
    {
      "Name": "Group2",
      "Fields": [
        {
          "Field": "EmployeeSCP.Salary",
          "Operator": "gt",
          "Value": "20000"
        }
      ],
      "Condition": "0"
    },
  ],
  "groupCondition": 0
}

My model

public class ValidationModelData
{
    public List<Data> Data { get;set; }
    public string groupCondition { get; set; }
}

public class FieldsData
{
    public string Field { get; set; }
    public string Operator { get; set; }
    public string Value { get; set; }
}

public class Data
{
    public string Name { get; set; }
    public List<FieldsData> Fields { get; set; }
    public string Condition { get; set; }
}

Using this information, I aim to construct a select query like this

select * from EmployeeSCP where salary < 50000 AND salary > 20000

If anyone can provide guidance, it would be greatly appreciated.

Answer №1

To start, the first step is to deserialize the data you have. Utilizing a powerful library like Json.Net can simplify this process.

string jsonData = ""; //your json string
var parsedData = JsonConvert.DeserializeObject<ValidationModelData>(jsonData);

Once you have deserialized the data, you can make use of Linq to filter and select specific objects in a manner similar to SQL:

var result = from item in parsedData
             where item.Name == "TestName"
             select item;

The same outcome can be achieved using method syntax as well:

var result = parsedData.Where(item => item.Name == "TestName");

Note that I am unable to provide an example with salary, as the given classes in this context do not possess such a property.

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