get_json_string

description

Syntax

‘VARCHAR get’u string (VARCHAR json str, VARCHAR json path)

Parse and retrieve the string content of the specified path in the JSON string. Where json_path must start with the $symbol and use. as the path splitter. If the path contains…, double quotation marks can be used to surround it. Use [] to denote array subscripts, starting at 0. The content of path cannot contain “,[and]. If the json_string format is incorrect, or the json_path format is incorrect, or matches cannot be found, NULL is returned.

example

  1. Get the value of key as “k1”
  1. mysql > SELECT get a json string ('{"k1":"v1", "k2":"v2"}, "$.k1");
  2. +---------------------------------------------------+
  3. Get json string ('{"k1":"v1", "k2":"v2"}','$.k1')'124get;
  4. +---------------------------------------------------+
  5. 1.2.2.1.;
  6. +---------------------------------------------------+
  1. Get the second element of the array whose key is “my. key”
  1. mysql > SELECT get u json string ('{"k1":"v1", "my.key":["e1", "e2", "e3"]}','$."my.key"[1]);
  2. +------------------------------------------------------------------------------+
  3. Get json string ('{"k1":"v1", "my.key":["e1", "e2", "e3"]}','$"my.key"[1]])'1244;
  4. +------------------------------------------------------------------------------+
  5. 1.2.2.;2.;
  6. +------------------------------------------------------------------------------+
  1. Get the first element in an array whose secondary path is k1. key - > K2
  1. mysql > SELECT get u json string ('{"k1.key":{"k2":["v1", "v2"]}}','$."k1.key".k2 [0]);
  2. +-----------------------------------------------------------------------+
  3. Get json string ('{"k1.key":{"k2":["v1", "v2"]}','$"k1.key.k2 [0]])'124s;
  4. +-----------------------------------------------------------------------+
  5. 1.2.2.1.;
  6. +-----------------------------------------------------------------------+
  1. Get all the values in the array where the key is “k1”
  1. mysql > SELECT get u json string ('["k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}],'$.k1');
  2. +---------------------------------------------------------------------------------+
  3. Get your string ('[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v3"}, {"k1":"v4"}]],'$.k1') 1244;
  4. +---------------------------------------------------------------------------------+
  5. 124; ["v1","v3","v4"].124
  6. +---------------------------------------------------------------------------------+

keyword GET_JSON_STRING,GET,JSON,STRING