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关于SQL的各种连接详情:https://www.cnblogs.com/Swaggy-yyq/p/14267882.html SQL SERVER: 左连接: select a.* from a, b where a.id *=b.id; 右连接: select a.* from a, b whe 阅读全文
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坤宏电子秤计重串口通讯格式说明 winform示例: using System; using System.Text; using System.IO.Ports; using System.Windows.Forms; namespace ElectronicBalance { /// <summ 阅读全文