mysql的jsonTable使用及说明

JSON_TABLE(
    expr,
    path COLUMNS (column_list)
)   [AS] alias

column_list:
    column[, column][, ...]

column:
    name FOR ORDINALITY
    |  name type PATH string path [on_empty] [on_error]
    |  name type EXISTS PATH string path
    |  NESTED [PATH] path COLUMNS (column_list)

on_empty:
    {NULL | DEFAULT json_string | ERROR} ON EMPTY

on_error:
    {NULL | DEFAULT json_string | ERROR} ON ERROR

CREATE TABLE t1
(
    id       varchar(32),
    name JSON
);

INSERT INTO t1
VALUES (uuid_short(), json_array('John'));
INSERT INTO t1
VALUES (uuid_short(), json_array('toma','Smith'));
INSERT INTO t1
VALUES (uuid_short(), json_array('aa','bb','cc','tt'));

SELECT value,id
from t1
        ,
     JSON_TABLE(name, '$[*]' COLUMNS (
         value VARCHAR(255) PATH '$'
         )) AS jt

INSERT INTO t1
VALUES ('1', json_array(json_object('a',1,'b',json_array(11,111)),
    json_object('a',2, 'b',json_array(22,222)),
    json_object('a',3)));

SELECT jt.*
FROM t1,
     JSON_TABLE(
             name,
             '$[*]' COLUMNS (
                 a INT PATH '$.a',
                 NESTED PATH '$.b[*]' COLUMNS (b INT PATH '$')
                 )
         ) AS jt
WHERE id = '1';