Update a MySQL column with JSON format?

To display records like JSON format, use MySQL concat(). Let us first create a table −

mysql> create table DemoTable1373
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentDetails text
   -> );
Query OK, 0 rows affected (0.86 sec)

Insert some records in the table using insert command. Here, we haven’t inserted anything −

mysql> insert into DemoTable1373 values();
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable1373 values();
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable1373 values();
Query OK, 1 row affected (0.18 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1373;

This will produce the following output −

+-----------+----------------+
| StudentId | StudentDetails |
+-----------+----------------+
|         1 | NULL           |
|         2 | NULL           |
|         3 | NULL           |
+-----------+----------------+
3 rows in set (0.00 sec)

Following is the query to update a MySQL field with JSON format −

mysql> update DemoTable1373 set StudentDetails=concat("{" "StudentName:", " John ,"," StudentAge:", 21,","," StudentCountryName: "," US","} ");
Query OK, 3 rows affected (0.14 sec)
Rows matched: 3  Changed: 3 Warnings: 0

Let us check the table records once again −

mysql> select * from DemoTable1373;

This will produce the following output −

+-----------+---------------------------------------------------------------+
| StudentId | StudentDetails                                                |
+-----------+---------------------------------------------------------------+
|         1 | {StudentName: John , StudentAge:21, StudentCountryName:  US}  |
|         2 | {StudentName: John , StudentAge:21, StudentCountryName:  US}  |
|         3 | {StudentName: John , StudentAge:21, StudentCountryName:  US}  |
+-----------+---------------------------------------------------------------+
3 rows in set (0.00 sec)