How to get a json object with specific key values, from a json array column?
In my MySQL 8.0 table, I have a JSON ARRAY column. It is an array of JSON objects. I want to pick one object out of each row's array, based on the key value pairs in the objects.
Example row:
[{bool:false, number:0, value:'hello'},
{bool:true, number:1, value:'world'},
{bool:true, number:2, value:'foo'},
{bool:false, number:1, value:'bar'}]
What I am trying to do is get the 'value' WHERE bool=true, AND number=1. So I want a query that in this example returns 'world'.
What would also work is if I could get the index of the object where bool=true and number=1, in this example it would return '$[1]'.
I am trying to run a query across the whole column, setting a new column to the value returned from the query. Is this possible with MySQL JSON functions? I've looked at the references but none have objects inside arrays like my example.
EDIT: If I do
SELECT JSON_SEARCH(column->"$[*]", 'all', '1');
SELECT JSON_SEARCH(names->"$[*]", 'all', 'true');
I get the paths/indexes of objects where number=1, and where bool=true, respectively. I would like the overlap of these two results.
mysql arrays json object
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
add a comment |
In my MySQL 8.0 table, I have a JSON ARRAY column. It is an array of JSON objects. I want to pick one object out of each row's array, based on the key value pairs in the objects.
Example row:
[{bool:false, number:0, value:'hello'},
{bool:true, number:1, value:'world'},
{bool:true, number:2, value:'foo'},
{bool:false, number:1, value:'bar'}]
What I am trying to do is get the 'value' WHERE bool=true, AND number=1. So I want a query that in this example returns 'world'.
What would also work is if I could get the index of the object where bool=true and number=1, in this example it would return '$[1]'.
I am trying to run a query across the whole column, setting a new column to the value returned from the query. Is this possible with MySQL JSON functions? I've looked at the references but none have objects inside arrays like my example.
EDIT: If I do
SELECT JSON_SEARCH(column->"$[*]", 'all', '1');
SELECT JSON_SEARCH(names->"$[*]", 'all', 'true');
I get the paths/indexes of objects where number=1, and where bool=true, respectively. I would like the overlap of these two results.
mysql arrays json object
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
add a comment |
In my MySQL 8.0 table, I have a JSON ARRAY column. It is an array of JSON objects. I want to pick one object out of each row's array, based on the key value pairs in the objects.
Example row:
[{bool:false, number:0, value:'hello'},
{bool:true, number:1, value:'world'},
{bool:true, number:2, value:'foo'},
{bool:false, number:1, value:'bar'}]
What I am trying to do is get the 'value' WHERE bool=true, AND number=1. So I want a query that in this example returns 'world'.
What would also work is if I could get the index of the object where bool=true and number=1, in this example it would return '$[1]'.
I am trying to run a query across the whole column, setting a new column to the value returned from the query. Is this possible with MySQL JSON functions? I've looked at the references but none have objects inside arrays like my example.
EDIT: If I do
SELECT JSON_SEARCH(column->"$[*]", 'all', '1');
SELECT JSON_SEARCH(names->"$[*]", 'all', 'true');
I get the paths/indexes of objects where number=1, and where bool=true, respectively. I would like the overlap of these two results.
mysql arrays json object
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
In my MySQL 8.0 table, I have a JSON ARRAY column. It is an array of JSON objects. I want to pick one object out of each row's array, based on the key value pairs in the objects.
Example row:
[{bool:false, number:0, value:'hello'},
{bool:true, number:1, value:'world'},
{bool:true, number:2, value:'foo'},
{bool:false, number:1, value:'bar'}]
What I am trying to do is get the 'value' WHERE bool=true, AND number=1. So I want a query that in this example returns 'world'.
What would also work is if I could get the index of the object where bool=true and number=1, in this example it would return '$[1]'.
I am trying to run a query across the whole column, setting a new column to the value returned from the query. Is this possible with MySQL JSON functions? I've looked at the references but none have objects inside arrays like my example.
EDIT: If I do
SELECT JSON_SEARCH(column->"$[*]", 'all', '1');
SELECT JSON_SEARCH(names->"$[*]", 'all', 'true');
I get the paths/indexes of objects where number=1, and where bool=true, respectively. I would like the overlap of these two results.
mysql arrays json object
mysql arrays json object
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
edited Jan 18 at 19:49
Jordan Youngs
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
asked Jan 18 at 19:38
Jordan YoungsJordan Youngs
83
83
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can use JSON_TABLE to convert the JSON into a derived table which you can then extract values from:
SELECT j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
value
world
If you also want to get the index within each JSON value of the value which matched, you can add a FOR ORDINALITY clause to your JSON_TABLE e.g.:
SELECT j.idx, j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(idx FOR ORDINALITY,
bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
idx value
2 world
Demo on dbfiddle
answered Jan 18 at 20:20
NickNick
27.1k111940
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use JSON_TABLE to convert the JSON into a derived table which you can then extract values from:
SELECT j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
value
world
If you also want to get the index within each JSON value of the value which matched, you can add a FOR ORDINALITY clause to your JSON_TABLE e.g.:
SELECT j.idx, j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(idx FOR ORDINALITY,
bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
idx value
2 world
Demo on dbfiddle
answered Jan 18 at 20:20
NickNick
27.1k111940
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
add a comment |
You can use JSON_TABLE to convert the JSON into a derived table which you can then extract values from:
SELECT j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
value
world
If you also want to get the index within each JSON value of the value which matched, you can add a FOR ORDINALITY clause to your JSON_TABLE e.g.:
SELECT j.idx, j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(idx FOR ORDINALITY,
bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
idx value
2 world
Demo on dbfiddle
answered Jan 18 at 20:20
NickNick
27.1k111940
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
add a comment |
You can use JSON_TABLE to convert the JSON into a derived table which you can then extract values from:
SELECT j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
value
world
If you also want to get the index within each JSON value of the value which matched, you can add a FOR ORDINALITY clause to your JSON_TABLE e.g.:
SELECT j.idx, j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(idx FOR ORDINALITY,
bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
idx value
2 world
Demo on dbfiddle
answered Jan 18 at 20:20
NickNick
27.1k111940
You can use JSON_TABLE to convert the JSON into a derived table which you can then extract values from:
SELECT j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
value
world
If you also want to get the index within each JSON value of the value which matched, you can add a FOR ORDINALITY clause to your JSON_TABLE e.g.:
SELECT j.idx, j.value
FROM test t
JOIN JSON_TABLE(t.jsonStr,
'$[*]'
COLUMNS(idx FOR ORDINALITY,
bool BOOLEAN PATH '$.bool',
number INT PATH '$.number',
value VARCHAR(20) PATH '$.value')) j
WHERE j.bool = true AND j.number = 1
Output:
idx value
2 world
Demo on dbfiddle
answered Jan 18 at 20:20
NickNick
27.1k111940
edited Jan 18 at 23:23
answered Jan 18 at 20:20
NickNick
27.1k111940
answered Jan 18 at 20:20
NickNick
27.1k111940
answered Jan 18 at 20:20
NickNick
27.1k111940
27.1k111940
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
add a comment |
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
Thank you! This worked and your examples were very helpful
– Jordan Youngs
Jan 21 at 16:00
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
@JordanYoungs no worries. Glad I could help.
– Nick
Jan 21 at 21:18
add a comment |
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