前言

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提示:以下是本篇文章正文内容,下面案例可供参考

背景:

当我们使用SQL查询时,想对数据字段中JOSN串进行特殊处理,以下为简单列举

#使用函数查询:JSON_CONTAINS(字段,JSON_OBJECT('json属性', '内容'))
select JSON_EXTRACT(password, '$.applCde') as applCde,JSON_EXTRACT(password, '$.applyAmt') as applyAmt from user where id='9'

#使用 json字段名->’$.json属性’ 进行查询条
select password->'$.applCde' as applCde,password->'$.applyAmt' as applyAmt from user where id='9'

查询

JSON数据双引号处理

平常的json数据在查询出来的时候 是有双引号的

第一种:

#使用`TRIM函数`去除双引号之后
select TRIM(BOTH '"' FROM JSON_EXTRACT(password, '$.applCde')) as applCde,JSON_EXTRACT(password, '$.applyAmt') as applyAmt from user where id='9'

第一种

第二种:

select TRIM(BOTH '"' from `password`->'$.applCde') as num from user WHERE id='9'

第二种

第三种:

#通过JSON_UNQUOTE 获取的json数据是不带双引号的
select JSON_UNQUOTE(`password`->'$.applCde') as num FROM user where id='9';

第三种

第四种:

select `password`->>'$.applCde' as num from user where id='9'

第四种

总结

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参考链接

GitHub 加速计划 / js / json
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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> --------- 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> --------- Signed-off-by: Harinath Nampally <harinath922@gmail.com> 9 天前
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