记录一个简单的DBHelper类吧，用的时候在上来拿！

/// <summary>/// 数据库连接工具类/// </summary>public class DBHelper{string constr = "Data Source=.;Initial Catalog=schoolDB;Integrated Security=True";private SqlConnection conn;//数据库连接Connection对象public SqlConnection getConnection() { if(conn==null){conn = new SqlConnection(constr);}return conn;}//打开连接public void OpenConnection() { if(conn.State==ConnectionState.Closed){conn.Open();}else if(conn.State==ConnectionState.Broken){conn.Close();conn.Open();}}//关闭连接public void CloseConnection() { if(conn.State==ConnectionState.Open||conn.State==ConnectionState.Broken){conn.Close();}}}

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