实现: 点击button1,从数据库中获得数据,指定数据库的某列数据插入到DataGridView指定列 一.双击button1进入事件代码 private void button1_Click(object sender, EventArgs e) { using (SQLiteConnection con = new SQLiteConnection(Constants.DATA_SOURCE)) { con.Open(); using (SQLiteCommand cmd = new SQ…
判断表是否存在: 语法: SELECT * FROM dbo.SysObjects where id = object_id(N'表名') 例子: SELECT * FROM dbo.SysObjects where id = object_id(N'ExchangeLog') if exists(SELECT * FROM dbo.SysObjects where id = object_id(N'ExchangeLog')) print '表存在' else print '表不存在' 判断列…
1.判断列内是否有重复值: Dim arrT As Range Dim rng As Range Set arrT = Range("A:A")'判读A列单元格 For Each rng In arrT If rng = Empty Then'如果单元格为空就退出循环,否者循环65535次 Exit For End If k = Application.CountIf(arrT, rng)’用CountIf函数扫描出重复值,跟excel的CountIF函数一样 If k > 1…
