【Oracle】数据库保存JSON数据类型的大文件;
json
适用于现代 C++ 的 JSON。
项目地址:https://gitcode.com/gh_mirrors/js/json
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·
一、问题
因为需要在数据库保存pdf的解析文件,需要用大的数据类型保存数据内容,所以需要使用CLOB数据文件类型;
- 二、方法
数据库使用CLOB类型的数据,使用方法和其他的一样,是Character Large Object 的缩写;在使用Mybatis框架的时候,jdbcType可以写CLOB,也可以写String;即
insert into student valuse {
#{id,jdbcType = VARCHAR},
#{name,jdbcType = VARCHAR},
#{article,jdbcType = CLOB}
}
或者:
insert into student valuse {
#{id,jdbcType = VARCHAR},
#{name,jdbcType = VARCHAR},
#{article,jdbcType = VARCHAR}
}
VARCHAR/Varchar2:采用单字节存储,有两个最大长度:一个是在字段类型4000;
Blob 采用单字节存储,适合保存二进制数据,如图片文件。
Clob 采用多字节存储,适合保存大型文本等字符类型数据。
三、疑问
这里,我遇到了一个问题,刚开始写的时候,我在Mybatis中配置数据库类型的时候,配置错了,数据库表中字段是CLOB类型,但是写mybatis的的jdbcType是VARCHAR类型,但是数据库也没有报错;我们查看官网的资料,
插入的时候也能正常插入,我怀疑是没有达到4000字节,没有报错,其也能存入,望大神赐教;
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> 16 小时前
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> 23 小时前
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