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How to create JSON format with group-concat in MySQL?
You can create JSON format using group_concat() function from MySQL. The syntax is as follows −
SELECT yourColumnName1,
GROUP_CONCAT(CONCAT('{anytName:"', yourColumnName, '",
anyName:"',yourColunName,'"}')) anyVariableName
from yourTableName
group by yourColumnName1;To understand the above syntax, let us first create a table. The query to create a table is as follows −
mysql> create table JsonFormatDemo -> ( -> UserId int, -> UserName varchar(100), -> UserEmail varchar(100) -> ); Query OK, 0 rows affected (0.99 sec)
Insert some records in the table using insert command. The query to insert record is as follows −
mysql> insert into JsonFormatDemo values(101,'John','John@gmail.com'); Query OK, 1 row affected (0.19 sec) mysql> insert into JsonFormatDemo values(101,'Bob','John@gmail.com'); Query OK, 1 row affected (0.18 sec) mysql> insert into JsonFormatDemo values(102,'Carol','Carol@gmail.com'); Query OK, 1 row affected (0.12 sec) mysql> insert into JsonFormatDemo values(103,'Sam','Sam@gmail.com'); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement. The query is as follows −
mysql> select *from JsonFormatDemo;
Output
+--------+----------+-----------------+ | UserId | UserName | UserEmail | +--------+----------+-----------------+ | 101 | John | John@gmail.com | | 101 | Bob | John@gmail.com | | 102 | Carol | Carol@gmail.com | | 103 | Sam | Sam@gmail.com | +--------+----------+-----------------+ 4 rows in set (0.00 sec)
The query to create a JSON format with the help of group_concat() function −
mysql> select UserId,
-> GROUP_CONCAT(CONCAT('{Name:"', UserName, '", Email:"',UserEmail,'"}')) JsonFormat
-> from JsonFormatDemo
-> group by UserId;Output
+--------+----------------------------------------------------------------------------+
| UserId | JsonFormat |
+--------+----------------------------------------------------------------------------+
| 101 | {Name:"John", Email:"John@gmail.com"},{Name:"Bob", Email:"John@gmail.com"} |
| 102 | {Name:"Carol", Email:"Carol@gmail.com"} |
| 103 | {Name:"Sam", Email:"Sam@gmail.com"} |
+--------+----------------------------------------------------------------------------+
3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
1K+ Views
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