11.8

visual studio framework项目里，连接数据库，可以在app.config里配置

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<connectionStrings>
<add name="connstr"
connectionString = "server=localhost;database=studentnewdb;user id=root;password=123456;pooling=true;charset=utf8;" providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
</configuration>

之后再cs文件里用 private static readonly String s = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;来获取连接字符串，这样以后修改数据库会比较简单