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access vba 公司自己用的生产管理(access vba)

基于VFP的出题小系统，以前做的，传上来分分享一下(Test system based on VFP, before doing, Chuan up points to share)

一个sqlite数据库操作文件。自己用着不错，共享下(A sqlite database operation file. Themselves with the good, the next sharing)

说明：  VC操作ADO和datagrid控件的源码，是动态的的。不受目录改变的限制(ADO and VC operation datagrid source control is the dynamic. From the directory to change the restrictions)

VFP开发用Grid多表头，封装成类，测试没有问题，可再次开发(VFP developers using Grid multiple headers, packaged into a class)

适合企业使用的考勤系统，可以记录每个员工的考勤情况。(Attendance system for business use, you can record each employee' s attendance.)

说明：  此压缩文件包含2002年-2017年200多个地级市资本存量的数据，里面有详细的计算过程与说明。(This document contains the capital stock data of more than 200 cities in 2002-2017, including detailed calculation process and description, which is convenient for scholars to understand and master)

Sqlite3 的确很好用。小巧、速度快。但是因为非微软的产品，帮助文档总觉得不够。这 些天再次研究它，又有一些收获，这里把我对 sqlite3 的研究列出来，以备忘记。(Sqlite3 really good use. Small, fast. But for the Microsoft products, always feel that not enough to help document. This Some day to study it, and have some harvest, here I study on SQLite3 list, to forget.)

dbf filter sample I found and very useful for dbf database programing

Handling null fields in SQL queries