MySQL: Unlocking the Power of JSON Arrays（mysqljson数组）

The latest version of MySQL, the world’s most popular open source relational databases, has opened up a new world of opportunities for developers. With the introduction of JSON arrays, developers can now store and query data in a more efficient and organized way than ever before.

JSON is a form of data specification that is both lightweight and human-readable. It stands for JavaScript Object Notation and it is used to store and exchange data between systems. The arrays feature of MySQL enables developers to store data in a much more structured, organized, and hierarchical way. With JSON arrays, it is also easier for developers to store hierarchically structured data and process them in a more efficient manner.

To create a MySQL array, the “CREATE ARRAY” query is used. Here’s a sample query to create a MySQL array:

CREATE ARRAY data (
    id INT AUTO_INCREMENT,
    first_name VARCHAR (255),
    last_name VARCHAR (255),
    address JSON
);

With the “INSERT” query, data can be inserted in the array. For the above example, the query for inserting data is as follows:

INSERT INTO data (first_name, last_name, address)
    VALUES ('John', 'Smith', 
        '{"address_line1": "123 Main St",
          "address_line2": "Apt. 1B",
          "city": "New York",
          "state": "NY",
          "zip": "10001"}');

The “SELECT” and “UPDATE” queries can be used to view, modify and query data stored in the array. With the use of array nesting and indexing, data can be accessed quickly and easily. For the above example, a query for querying the data is as follows:

SELECT * 
FROM data 
    WHERE address->zip = '10001';

The above query will return all the data from “data” array where the “zip” field of the “address” object is equal to “10001”.

Data stored in JSON arrays can also be accessed using the “JSON_OBJECT()” and “JSON_ARRAYAGG()” functions. For example, the following query would return an array of all the objects in the data array that contain a “zip” field:

“`

SELECT JSON_ARRAYAGG(JSON_OBJECT(‘id’, id, ‘first_name’, first_name, ‘last_name’, last_name, ‘address’, address))

FROM data

WHERE JSON_EXTRACT(address, ‘$.zip’) = ‘10001’;

JSON arrays provide developers with a way to store data in a more organized and efficient way. Additionally, the use of nested objects and indexing makes it easier to query and access the data. With the power of JSON arrays, developers have a new way to store and query data with MySQL.