I have a column which contains a JSON value of different lengths
["The Cherries:2.50","Draw:3.25","Swansea Jacks:2.87"]
I want to split them and store into a JSON like so:
[
{
name: "The Cherries",
odds: 2.50
},
{
name: "Draw",
odds: 3.25
},
{
name: "Swansea",
odds: 2.87
},
]
What I did right now is looping and splitting them in the UI which to me is quite heavy for the client. I want to parse and split them all in a single query.
If you are running MySQL 8.0, you can use json_table() to split the original arrayto rows, and then build new objects and aggregate them with json_arrayagg().
We need a primary key column (or set of columns) so we can properly aggreate the generated rows, I assumed id:
select
t.id,
json_arrayagg(json_object(
'name', substring(j.val, 1, locate(':', j.val) - 1),
'odds', substring(j.val, locate(':', j.val) + 1)
)) new_js
from mytable t
cross join json_table(t.js, '$[*]' columns (val varchar(500) path '$')) as j
group by t.id
Demo on DB Fiddle
Sample data:
id | js
-: | :-------------------------------------------------------
1 | ["The Cherries:2.50", "Draw:3.25", "Swansea Jacks:2.87"]
Query results:
id | new_js
-: | :----------------------------------------------------------------------------------------------------------------------
1 | [{"name": "The Cherries", "odds": "2.50"}, {"name": "Draw", "odds": "3.25"}, {"name": "Swansea Jacks", "odds": "2.87"}]
You can use json_table to create rows from the json object.
Just replace table_name with your table name and json with the column that contains json
SELECT json_arrayagg(json_object('name',SUBSTRING_INDEX(person, ':', 1) ,'odds',SUBSTRING_INDEX(person, ':', -1) ))
FROM table_name,
JSON_TABLE(json, '$[*]' COLUMNS (person VARCHAR(40) PATH '$') people;
Here is a Db fiddle you can refer
https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=801de9f067e89a48d45ef9a5bd2d094a
I want to read the values from json and need to create a new json so is there any way that
we can save json in table and columns in oracle that will help to perform calculation on that. calculation is too complax.
Here is the json sample and json has many hash and
{
"agri_Expense": {
"input": 6000,
"max": 7500,
"check": 7500
},
"income3": {
"Hiring_income": 239750
},
"Operational_Cost1": [
{
"Field_input3": 10000,
"Minimum": "0.05",
"Check_Input": 26750,
"Tractor_Cost": "Maintenance"
}
]
}
You do not need PL/SQL, and can do it entirely in SQL.
I want to read the values from json [...] so is there any way that
we can save json in table and columns in oracle
Yes, use SQL to create a table:
CREATE TABLE table_name ( json_column CLOB CHECK ( json_column IS JSON ) )
and then INSERT the value there:
INSERT INTO table_name ( json_column ) VALUES (
'{'
|| '"agri_Expense": {"input": 6000,"max": 7500,"check": 7500},'
|| '"income3": {"Hiring_income": 239750},'
|| '"Operational_Cost1": [{"Field_input3": 10000,"Minimum": "0.05","Check_Input": 26750,"Tractor_Cost": "Maintenance"}]'
|| '}'
)
then, if you want individual values, SELECT using JSON_TABLE:
SELECT j.*
FROM table_name t
CROSS JOIN JSON_TABLE(
t.json_column,
'$'
COLUMNS (
agri_expense_input NUMBER PATH '$.agri_Expense.input',
agri_expense_max NUMBER PATH '$.agri_Expense.max',
agri_expense_check NUMBER PATH '$.agri_Expense.check',
income3_hiring_income NUMBER PATH '$.income3.Hiring_income',
NESTED PATH '$.Operational_Cost1[*]'
COLUMNS (
oc1_field_input3 NUMBER PATH '$.Field_input3',
oc1_minimum NUMBER PATH '$.Minimum',
oc1_check_input NUMBER PATH '$.Check_Input'
)
)
) j
Which outputs:
AGRI_EXPENSE_INPUT | AGRI_EXPENSE_MAX | AGRI_EXPENSE_CHECK | INCOME3_HIRING_INCOME | OC1_FIELD_INPUT3 | OC1_MINIMUM | OC1_CHECK_INPUT
-----------------: | ---------------: | -----------------: | --------------------: | ---------------: | ----------: | --------------:
6000 | 7500 | 7500 | 239750 | 10000 | .05 | 26750
db<>fiddle here
I'm using MYSql server 8.0.17.
I want to get record with uId= 'UR000001' and also with VIEW = 'Y' from the security column(Shown in Table).
Viewid Security
VW0000000002 {"security": [{"uId": "UR000001", "edit": "N", "view": "Y"}, {"uId": "UR000002", "edit": "N", "view": "Y"}]}
VW0000000013 {"security": [{"uId": "UR000001", "edit": "N", "view": "N"}, {"uId": "UR000002", "edit": "N", "view": "Y"}]}
VW0000000014 {"security": [{"uId": "UR000001", "edit": "N", "view": "Y"}, {"uId": "UR000002", "edit": "N", "view": "Y"}]}
JSON_SEARCH function searches all array elements of the record that I don't want.
Here is the query that I had tried but it returns the result with all matching (uID='UR000001' OR View='Y')
SELECT viewid,
Json_search(`security`, 'one', 'UR000001', NULL, '$.security[*].uId'),
Json_search(`security`, 'one', 'Y', NULL, '$.security[*].view')
FROM vw_viewmaster
WHERE Json_search(`security`, 'one', 'UR000001', NULL, '$.security[*].uId')
AND Json_search(`security`, 'one', 'Y', NULL, '$.security[*].view');
Actual Result:(uID='UR000001' OR View='Y')
VW0000000002 "$.security[0].uId" "$.security[0].view"
VW0000000013 "$.security[0].uId" "$.security[1].view"
VW0000000014 "$.security[0].uId" "$.security[0].view"
Expected result:(uID='UR000001' AND View='Y')
VW0000000002 "$.security[0].uId" "$.security[0].view"
VW0000000014 "$.security[0].uId" "$.security[0].view"
In MySQL 8.0, you can use handy JSON function json_table() to convert a json array to rows. You can then search the resultset.
The following query gives you all viewids whose at least one array element with attribute uId is equal to 'UR000001' and attribute view is 'Y':
select v.viewid
from vw_viewmaster v
where exists (
select 1
from json_table(
v.security -> '$.security',
'$[*]'
columns(
uid varchar(50) path '$.uId',
edit varchar(1) path '$.edit',
view varchar(1) path '$.view'
)
) x
where x.uid = 'UR000001' and x.view = 'Y'
);
For your dataset, this produces:
| viewid |
| ------------ |
| VW0000000002 |
| VW0000000014 |
If you want the details of the matching array object(s), then:
select v.viewid, x.*
from vw_viewmaster v
cross join json_table(
v.security -> '$.security',
'$[*]'
columns(
rowid for ordinality,
uid varchar(50) path '$.uId',
edit varchar(1) path '$.edit',
view varchar(1) path '$.view'
)
) x
where x.uid = 'UR000001' and x.view = 'Y'
As a bonus, rowid gives you the index of the matching object in the JSON array (the first object has index 1).
This yields:
| viewid | rowid | uid | edit | view |
| ------------ | ----- | -------- | ---- | ---- |
| VW0000000002 | 1 | UR000001 | N | Y |
| VW0000000014 | 1 | UR000001 | N | Y |
However please note that if more than one object in the array that satisfies the conditions, the above query would generate more than one row per row in the original table (this is why I used exists in the first query).
I have the following JSON:
{
"params" : {
"A" : 200.5,
"B" : 70.2
}
}
And the following table:
CREATE TABLE `params` (
`param` varchar(255),
`value` float
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
Is there a way to make mysql function with one insert query without using "while do" directly to insert all the parameters into table like this:
-------+-------
| param | value |
|-------+-------|
| A | 200.5|
| B | 70.2|
---------------
If you are running MySQL 8.0, you can use json_keys() to dynamically extract the keys from the json subobject as a json array, and then use json_table() to turn it to rows. You can then extract the values.
Consider:
insert into `params`
with t as (select '{"params": { "A": 200.5, "B": 70.2 } }' js)
select x.k, json_extract(js, concat('$.params.', x.k)) v
from
t
cross join json_table(
json_keys(js->"$.params"),
"$[*]" columns(k varchar(255) path "$")
) as x
Demo on DB Fiddle
Content of the table after running the query:
param | value
:---- | ----:
A | 200.5
B | 70.2
We can insert multiple rows with a single query using insert into. we need to construct this query using your JSON object
INSERT INTO params(param,value)
VALUES('A',200.5), ('B', 70.2);
Let's say I have a JSON column named data in some MySQL table, and this column is a single array. So, for example, data may contain:
[1,2,3,4,5]
Now I want to select all rows which have a data column where one of its array elements is greater than 2. Is this possible?
I tried the following, but seems it is always true regardless of the values in the array:
SELECT * from my_table
WHERE JSON_EXTRACT(data, '$[*]') > 2;
You may search an array of integers as follows:
JSON_CONTAINS('[1,2,3,4,5]','7','$') Returns: 0
JSON_CONTAINS('[1,2,3,4,5]','1','$') Returns: 1
You may search an array of strings as follows:
JSON_CONTAINS('["a","2","c","4","x"]','"x"','$') Returns: 1
JSON_CONTAINS('["1","2","3","4","5"]','"7"','$') Returns: 0
Note: JSON_CONTAINS returns either 1 or 0
In your case you may search using a query like so:
SELECT * from my_table
WHERE JSON_CONTAINS(data, '2', '$');
SELECT JSON_SEARCH('["1","2","3","4","5"]', 'one', "2") is not null
is true
SELECT JSON_SEARCH('["1","2","3","4","5"]', 'one', "6") is not null
is false
Since MySQL 8 there is a new function called JSON_TABLE.
CREATE TABLE my_table (id INT, data JSON);
INSERT INTO my_table VALUES
(1, "[1,2,3,4,5]"),
(2, "[0,1,2]"),
(3, "[3,4,-10]"),
(4, "[-1,-2,0]");
SELECT DISTINCT my_table.*
FROM my_table, JSON_TABLE(data, "$[*]" COLUMNS(nr INT PATH '$')) as ids
WHERE ids.nr > 2;
+------+-----------------+
| id | data |
+------+-----------------+
| 1 | [1, 2, 3, 4, 5] |
| 3 | [3, 4, -10] |
+------+-----------------+
2 rows in set (0.00 sec)
I use a combination of JSON_EXTRACT and JSON_CONTAINS (MariaDB):
SELECT * FROM table WHERE JSON_CONTAINS(JSON_EXTRACT(json_field, '$[*].id'), 11, '$');
I don't know if we found the solution.
I found with MariaDB a way, to search path in a array. For example, in array [{"id":1}, {"id":2}], I want find path with id equal to 2.
SELECT JSON_SEARCH('name_field', 'one', 2, null, '$[*].id')
FROM name_table
The result is:
"$[1].id"
The asterisk indicate searching the entire array
This example works for me with mysql 5.7 above
SET #j = '{"a": [ "8428341ffffffff", "8428343ffffffff", "8428345ffffffff", "8428347ffffffff","8428349ffffffff", "842834bffffffff", "842834dffffffff"], "b": 2, "c": {"d": 4}}';
select JSON_CONTAINS(JSON_EXTRACT(#j , '$.a'),'"8428341ffffffff"','$') => returns 1
notice about " around search keyword, '"8428341ffffffff"'
A possible way is to deal with the problem as string matching. Convert the JSON to string and match.
Or you can use JSON_CONTAINS.
You can use JSON extract to search and select data
SELECT data, data->"$.id" as selectdata
FROM table
WHERE JSON_EXTRACT(data, "$.id") = '123'
#ORDER BY c->"$.name";
limit 10 ;
SET #doc = '[{"SongLabels": [{"SongLabelId": "111", "SongLabelName": "Funk"}, {"SongLabelId": "222", "SongLabelName": "RnB"}], "SongLabelCategoryId": "test11", "SongLabelCategoryName": "曲风"}]';
SELECT *, JSON_SEARCH(#doc, 'one', '%un%', null, '$[*].SongLabels[*].SongLabelName')FROM t_music_song_label_relation;
result: "$[0].SongLabels[0].SongLabelName"
SELECT song_label_content->'$[*].SongLabels[*].SongLabelName' FROM t_music_song_label_relation;
result: ["Funk", "RnB"]
I have similar problem, search via function
create function searchGT(threshold int, d JSON)
returns int
begin
set #i = 0;
while #i < json_length(d) do
if json_extract(d, CONCAT('$[', #i, ']')) > threshold then
return json_extract(d, CONCAT('$[', #i, ']'));
end if;
set #i = #i + 1;
end while;
return null;
end;
select searchGT(3, CAST('[1,10,20]' AS JSON));
This seems to be possible with to JSON_TABLE function. It's available in mysql version 8.0 or mariadb version 10.6.
With this test setup
CREATE TEMPORARY TABLE mytable
WITH data(a,json) AS (VALUES ('a','[1]'),
('b','[1,2]'),
('c','[1,2,3]'),
('d','[1,2,3,4]'))
SELECT * from data;
we get the following table
+---+-----------+
| a | json |
+---+-----------+
| a | [1] |
| b | [1,2] |
| c | [1,2,3] |
| d | [1,2,3,4] |
+---+-----------+
It's possible to select every row from mytable wich has a value greater than 2 in the json array with this query.
SELECT * FROM mytable
WHERE TRUE IN (SELECT val > 2
FROM JSON_TABLE(json,'$[*]'
columns (val INT(1) path '$')
) as json
)
Returns:
+---+-----------+
| a | json |
+---+-----------+
| c | [1,2,3] |
| d | [1,2,3,4] |
+---+-----------+