- #Mysql json compare column with a json object how to#
- #Mysql json compare column with a json object code#
Id Url Tags Owner Email ( var item in Model) In this table will be shown Id and Url properties from the standard columns, and tags, owner name/surname, and email address that are read from the JSON columns:
In this example, I will show blogs on Blog/Index.cshtml page in a table. We need a view that shows Tags and Owner properties. Once we map model properties to JSON columns, we can display information from the JSON columns. Search for blogs by owner name that is stored in Person class and formatted as JSON key.Create new Blog by entering both value-type properties and complex properties.Display all blogs with both value-type properties stored in standard table columns, and complex properties formatted as JSON.In this part of the article, I will describe a simple ASP.NET MVC application that enables you to: ASP.NET MVC App that Works with the JSON Fields
#Mysql json compare column with a json object code#
Since external code uses only public properties that represent C# equivalents of JSON objects, nobody will know how these Properties are serialized. That’s all – whenever your model class is read from database or when context is saved, JSON string in these properties will be stored to JSON columns, and vice versa. Optionally, you can add some JSON.Net attributes to customize how the fields are serialized into JSON column. This table will be serialized/de-serialized using JsonConvert class in property code of the Blog class. Since this is just a utility class that is used to define properties in Owner property, it is not mapped to database table. We will start with a simple Blog/Post classes in the EF model: This sample is built on top of the standard Blog sample that is used in EF blog.
#Mysql json compare column with a json object how to#
In this article, I will shown you how to map JSON fields from the SQL tables into the EF model classes.
Now, the main question is how can we use those kind of fields in Entity Framework to serialize some structures as arrays and smaller objects? This might be a nice solution for some lightweight objects, such as simple arrays or key:value dictionaries, that you want to keep as part of your main entity. You can create a table that can have both standard columns and relationships to other tables, but also some semi-structured information formatted as JSON in standard NVARCHAR columns: SQL Server 2016 and Azure SQL Database (I will call them SQL Database in the following sections) enables you to store hybrid data with both relational tables and columns, but also you can store some properties as complex structures formatted as JSON text. However, let's assume that you don’t want a separate table for every non-trivial property, so you don’t want to create additional BlogsTags, Tags, and Person tables for these properties. Usually, you need to map them to separate tables because you cannot store string array in the table column. Now imagine that you want to add in the Blog class some complex properties such as tags (array of strings), or information about the blog owner (separate class). Both classes are persisted in database as Blogs and Posts tables. Imagine that you have Blog class in your model that has few value-type properties such as BlogId ( int), Url of the blog ( string), and relationship to the Post class. However, what can we do with the complex properties in the model classes, such as arrays and object? If you have properties in the model classes with simple/value types (e.g., int, double, string, boolean), every value type can be easily mapped into columns of the underlying table. Usually, there is one-to-one relationship between model classes and relational tables. Entity Framework enables you to map your C# model classes to SQL relational tables.
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