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sql = "select * from TableName where A = 30 and B =30 And C = 30"
Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\db1.mdb;Persist Security Info=False"
Adodc1.RecordSource = sql
Adodc1.Refresh'对查询更新
DataGrid1.Refresh