mysql 取JSON数据
json
适用于现代 C++ 的 JSON。
项目地址:https://gitcode.com/gh_mirrors/js/json
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正常的json使用mysql 取数据如下即可
-- 查询记录
SELECT sname,JSON_EXTRACT(info,'$.age') FROM t_json;
SELECT sname,info->'$.age' FROM t_json;
当从数组重取数据时,需要添加数组下标,
-- 查询记录
SELECT sname,JSON_EXTRACT(info,'$[0].age') FROM t_json;
SELECT sname,info->'$[0].age' FROM t_json;
$[0]: 0代表数组下标 ,取第一条数据,注意,解析后的数据带双引号,可使用replace函数替换
json数组查询,用 JSON_CONTAINS(字段, JSON_OBJECT('json属性', "内容")) : [{}]查询这种形式的json数组
-- 查询记录
SELECT * FROM t_json WHERE JSON_CONTAINS(info,JSON_OBJECT('age','18')) ;
适用于现代 C++ 的 JSON。
最近提交(Master分支:3 个月前 )
f06604fc
* :page_facing_up: bump the copyright years
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* :page_facing_up: bump the copyright years
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* :page_facing_up: bump the copyright years
Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com>
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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com> 8 天前
d23291ba
* add a ci step for Json_Diagnostic_Positions
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* Update ci.cmake to address review comments
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* address review comment
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix typo in the comment
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix typos in ci.cmake
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* invoke the new ci step from ubuntu.yml
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* issue4561 - use diagnostic positions for exceptions
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix ci_test_documentation check
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* address review comments
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix ci check failures for unit-diagnostic-postions.cpp
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* improvements based on review comments
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix const correctness string
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* further refinements based on reviews
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* add one more test case for full coverage
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* ci check fix - add const
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* add unit tests for json_diagnostic_postions only
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix ci_test_diagnostics
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
* fix ci_test_build_documentation check
Signed-off-by: Harinath Nampally <harinath922@gmail.com>
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Signed-off-by: Harinath Nampally <harinath922@gmail.com> 9 天前
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