商品分类筛选条件建模数据表的设计
近端时间，由于商城项目的需求，学习探索了一下商品分类筛选条件。在学习过程中，一贯喜欢参考前人的东西，希望能从中得到一些独特的设计思路。京东、淘宝等大牛对这方面做得非常好，不管是用户体验还是技术方面。我们先看看京东的效果图 个人分析：京东的商
近端时间，由于商城项目的需求，学习探索了一下商品分类筛选条件。在学习过程中，一贯喜欢参考前人的东西，希望能从中得到一些独特的设计思路。京东、淘宝等大牛对这方面做得非常好，不管是用户体验还是技术方面。我们先看看京东的效果图
个人分析：京东的商品筛选中，每个子类型都对于一个具体的模型，而模型下又分为属性（如：功能）以及属性值集。经过两天的整理，总算成型。现在拿出来跟大家分享一下，有什么不足之处，希望大家不怜赐教。
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Model表
Attribute表
GoodsAttribute表
How to Grant Permissions to New MySQL UsersMay 09, 2025 am 12:16 AMTograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)
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MySQL: String Data Types and CollationsMay 09, 2025 am 12:08 AMThe string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.
MySQL: What length should I use for VARCHARs?May 09, 2025 am 12:06 AMThe best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.
MySQL BLOB : are there any limits?May 08, 2025 am 12:22 AMMySQLBLOBshavelimits:TINYBLOB(255bytes),BLOB(65,535bytes),MEDIUMBLOB(16,777,215bytes),andLONGBLOB(4,294,967,295bytes).TouseBLOBseffectively:1)ConsiderperformanceimpactsandstorelargeBLOBsexternally;2)Managebackupsandreplicationcarefully;3)Usepathsinst
MySQL : What are the best tools to automate users creation?May 08, 2025 am 12:22 AMThe best tools and technologies for automating the creation of users in MySQL include: 1. MySQLWorkbench, suitable for small to medium-sized environments, easy to use but high resource consumption; 2. Ansible, suitable for multi-server environments, simple but steep learning curve; 3. Custom Python scripts, flexible but need to ensure script security; 4. Puppet and Chef, suitable for large-scale environments, complex but scalable. Scale, learning curve and integration needs should be considered when choosing.
MySQL: Can I search inside a blob?May 08, 2025 am 12:20 AMYes,youcansearchinsideaBLOBinMySQLusingspecifictechniques.1)ConverttheBLOBtoaUTF-8stringwithCONVERTfunctionandsearchusingLIKE.2)ForcompressedBLOBs,useUNCOMPRESSbeforeconversion.3)Considerperformanceimpactsanddataencoding.4)Forcomplexdata,externalproc
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