Hi can anyone tell me what is wrong with this query.
DECLARE @json LONGTEXT;
SET @json = '[ { "name":"John Smith", "address":"780 Mission St, San Francisco, CA 94103"}, { "name":"Sally Brown", "address":"75 37th Ave S, St Cloud, MN 94103"}, { "name":"John Johnson", "address":"1262 Roosevelt Trail, Raymond, ME 04071"} ]';
##SELECT @json;
SELECT * FROM JSON_TABLE (@json, '$[*]' COLUMNS (
name VARCHAR(40) PATH '$.name',
address VARCHAR(100) PATH '$.address'));
Error that i get is
You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near '(@json, '$[*]' COLUMNS (
name VARCHAR(40) PATH '$.name',
' at line 1
Just for Information I am using TOAD as tool to connect to my cloud my sql instance.
First, in mysql you don't need to declare a variable, in this case. Just use 'SET' keyword. And finaly, you need put an alias for your 'select' query. Like this:
SET @json = '[ { "name":"John Smith", "address":"780 Mission St, San Francisco, CA 94103"}, { "name":"Sally Brown", "address":"75 37th Ave S, St Cloud, MN 94103"}, { "name":"John Johnson", "address":"1262 Roosevelt Trail, Raymond, ME 04071"} ]';
##SELECT @json;
SELECT * FROM JSON_TABLE (@json, '$[*]' COLUMNS (
`name` VARCHAR(40) PATH '$.name',
`address` VARCHAR(100) PATH '$.address')) AS T;
Ideally you should be upgrading to MYSQL 8, this answer is more meant to have fun
You need to write tricky SQL to simulate/emulate MySQL's 8.0 JSON_TABLE() in versions below MySQL 8
Query
SET @json = '[ { "name":"John Smith", "address":"780 Mission St, San Francisco, CA 94103"}, { "name":"Sally Brown", "address":"75 37th Ave S, St Cloud, MN 94103"}, { "name":"John Johnson", "address":"1262 Roosevelt Trail, Raymond, ME 04071"} ]';
##SELECT @json;
SELECT * FROM JSON_TABLE (@json, '$[*]' COLUMNS (
`name` VARCHAR(40) PATH '$.name',
`address` VARCHAR(100) PATH '$.address')) AS T;
Result
| name | address |
| ------------ | --------------------------------------- |
| John Smith | 780 Mission St, San Francisco, CA 94103 |
| Sally Brown | 75 37th Ave S, St Cloud, MN 94103 |
| John Johnson | 1262 Roosevelt Trail, Raymond, ME 04071 |
see demo
MySQL's 5.7 simulate/emulate query involves using a number generator and multiple native MySQL's JSON functions.
Query
SELECT
REPLACE(JSON_EXTRACT(json_record.json, CONCAT('$[',number,'].name')), '"', '') AS name
, REPLACE(JSON_EXTRACT(json_record.json, CONCAT('$[',number,'].address')), '"', '') AS address
FROM (
SELECT
@row := @row + 1 AS number
FROM (
SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
) row1
CROSS JOIN (
SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
) row2
CROSS JOIN (
SELECT @row := -1
) init_user_params
) AS number_generator
CROSS JOIN (
SELECT
JSON_LENGTH(json_information.json) - 1 AS json_length
, json_information.json
FROM (
SELECT
record.json
FROM (
SELECT
'
[{
"name": "John Smith",
"address": "780 Mission St, San Francisco, CA 94103"
}, {
"name": "Sally Brown",
"address": "75 37th Ave S, St Cloud, MN 94103"
}, {
"name": "John Johnson",
"address": "1262 Roosevelt Trail, Raymond, ME 04071"
}]
' AS json
FROM
DUAL
) AS record
) AS json_information
) AS json_record
WHERE
number BETWEEN 0 AND json_length
Result
| name | address |
| ------------ | --------------------------------------- |
| John Smith | 780 Mission St, San Francisco, CA 94103 |
| Sally Brown | 75 37th Ave S, St Cloud, MN 94103 |
| John Johnson | 1262 Roosevelt Trail, Raymond, ME 04071 |
see demo
