三步曲是 、建立连接二、建立命令三、执行命令 Sqlconnection conn=new Sqlconnectiono conn Connection String="server= database=classmates user id=abC, password=123 Sqlcommand cmd=new Sqlcommando cmd Connection= conn cmd command Text= delete from records where性别=女’”; conn. Open cmd. ExecuteNonQueryo conn. Close▪ 三步曲是: ▪ 一、建立连接 二、建立命令 三、执行命令 SqlConnection conn=new SqlConnection(); conn.ConnectionString=“server=.;database=classmates; user id=abc;password=123”; SqlCommand cmd=new SqlCommand(); cmd.Connection=conn; cmd.CommandText=“delete from records where 性别=‘女’”; conn.Open() cmd.ExecuteNonQuery(); conn.Close();