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MySQL Default Order

In the SQL world, order is not an inherent property of a set of data. Thus, you get no guarantees from your RDBMS that your data will come b

2021-12-28

Web Project Functions: Export Data

Ways of Exporting RequestsSynchronized ExportIf to exported data is not large and the exporting process can be finished in a few seconds, we

2021-12-08

How to learn programming technologies

关于学习编程技术,我认为,没有最好的方法,只有适合自己当前水平状态的、可以达成自己目标的学习方法。每个人有不同的适应自己的学习方法,每个阶段有不同的学习方法,学习的目的不同使用的方法也不同。简而言之,方法不是固定不变的。 学习方法一般有: 看官方文档。 看书籍。 看博客、教程等

2021-11-29

HTML元素的id是否唯一

HTML 元素原则上应该保持唯一,但没有硬性要求。 存在多个相同的 id 元素时,CSS 对所有元素都生效。 1234567891011<style> #myId { color:red; }</style>&

2021-11-26

[Spring Error] Invalid list index 256

BackgroundUsing List<Integer> ids to receive a form parameter of HTTP request. The size of the parameter ids is over 255. Error Info1o

2021-11-23

Java Security Usage

EncodeBase6412345String text = "hello 世界";String encodeText = Base64.getEncoder().encodeToString(text.getBytes(StandardCharsets.UT

2021-11-05

MyBatis-Plus Common Usage

QueryQueryWrapperQueryWrapper 12345678// usage 1QueryWrapper<SysUser> queryWrapper = new QueryWrapper<SysUser>() .eq("us

2021-11-02

[Spring Error] Could not resolve placeholder

BackgroundRunning the Spring Boot project occurs an error. Error Info123Caused by: java.lang.IllegalArgumentException: Could not resolve pla

2021-11-01

[JDBC Error] Data truncated for column 'xxx'

BackgroundWhen I do an insert operation to save the item data to MySQL, occurs an error. Error Info1Error updating database. Cause: java.sq

2021-10-29

[FreeMarker Error] Failed to "?eval" string

BackgroundWhen I use the FreeMarker to generate text files, occurs an error: Failed to “?eval” string. 1<#assign dataFromConfigJson &#x3D

2021-10-27
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