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从ConnectionStringSettings获得数据库连接使程序与具体数据库

//using system.data; //using system.data.common; connectionstringsettings asett = system.configuration.configurationmanager.connectionstrings[configeddb]; dbproviderfactory af = dbproviderfactories.getfactory(asett.providername); dbconne
//using system.data;
//using system.data.common;
connectionstringsettings  asett = system.configuration.configurationmanager.connectionstrings[configeddb];
            dbproviderfactory af = dbproviderfactories.getfactory(asett.providername);
            dbconnection aconn = af.createconnection();
            aconn.open();
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