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string connstr = "Provider = Microsoft.Jet.OLEDB.4.0; Data Source=db.mdb";
string myExecuteQuery = "insert into test (aa) values ('123')";//增、删、改等语句
OleDbConnection myConnection = new OleDbConnection(connstr);
OleDbCommand myCommand = new OleDbCommand(myExecuteQuery, myConnection);
myCommand.Connection.Open();
if (myCommand.ExecuteNonQuery() > 0) //返回影响的行数
{ MessageBox.Show("ok"); }
myConnection.Close();