MySQL中的JSON函数（二）查询JSON函数

（二）查询JSON函数

JSON_CONTAINS()      #查询文档中是否包含指定的元素

JSON_CONTAINS_PATH()      #查询文档中是否包含指定的路径

JSON_EXTRACT()      #根据条件提取文档中数据

JSON_KEYS()      #提取所有key的集合

JSON_SEARCH()      #返回所有符合条件的路径集合

 1.JSON_CONTAINS() 

SELECT JSON_CONTAINS('[1,2,3,"abc",null]','"abc"')
SELECT JSON_CONTAINS('[1,2,3,"abc",null]','10')

SELECT JSON_CONTAINS('[1,2,3,"abc",null]','[1,3]')

2. JSON_CONTAINS_PATH()

SELECT JSON_CONTAINS_PATH('{"k1":"jack","k2":"tom","k3":"lisa"}','one','$.k1','$.k4') one_path

SELECT json_contains_path('{"k1":"jack","k2":"tom","k3":"lisa"}','all','$.k1','$.k4') all_path

 3.JSON_EXTRACT()

SELECT json_extract('[10,20,[30,40]]','$[0]','$[1]')

SELECT json_extract('[10,20,[30,40]]','$[0]','$[1]'),json_extract('[10,20,[30,40]]','$[2]'),json_extract('[10,20,[30,40]]','$[2][*]')

SELECT id1,id1->"$[0]",id1->"$[1]" FROM t1 WHERE id1->"$[0]"=10

 

 4.JSON_KEYS()

SELECT JSON_KEYS('{"a":1,"b":{"c":30}}'),JSON_KEYS('{"a":1,"b":{"c":30}}','$.b')

5.JSON_SEARCH()

SELECT 
  json_search (
    '{"k1":"jack","k2":"tom","k3":"lisa","k4":"tony"}',
    'one',
    't%'
  ) ONE,
  json_search (
    '{"k1":"jack","k2":"tom","k3":"lisa","k4":"tony"}',
    'all',
    't%'
  ) one_or_all,
  json_search (
    '{"k1":"jack","k2":"tom","k3":"lisa","k4":"tony"}',
    'all',
    't%'
  ) "all"