在ASP.NET程序中创建唯一序号

m_dbConn = new OleDbConnection(DbString);
m_fAutoDelConn = true;
m_dbAdapter = new OleDbDataAdapter();
m_dbConn.Open();
}
/// <summary>
/// 通过连接字符串构造内部的数据库连接对象
/// </summary>
/// <param name="strConnection">ADO连接字符串</param>
public OleDbWrap(string strConnection)
{
m_dbConn = new OleDbConnection(strConnection);
m_fAutoDelConn = true;
m_dbAdapter = new OleDbDataAdapter();
m_dbConn.Open();
}
/// <summary>
/// 通过现有连接构造对象，在对象被清除时不会自动清除 数据库连接对象
/// </summary>
/// <param name="conn">现存的数据库连接对象</param>
public OleDbWrap(OleDbConnection conn)
{
m_dbConn = conn;
m_fAutoDelConn = false;
m_dbAdapter = new OleDbDataAdapter();
//m_dbConn.Open();
}
public virtual void Dispose()
{
m_dbAdapter.Dispose();
if(m_fAutoDelConn)
{
m_dbConn.Close();
m_dbConn.Dispose();
}
}
/// <summary>
/// 通过SQL语句创建DataReader对象
/// </summary>
/// <param name="szSql">SQL语句</param>
/// <returns>DataReader对象</returns>
public OleDbDataReader CreateDataReader(string szSql)
{
OleDbCommand cmd = new OleDbCommand(szSql,m_dbConn);
OleDbDataReader dr= cmd.ExecuteReader();
cmd.Dispose();
return dr;
}
/// <summary>
/// 通过SQL查询语句，返回第一行结果，可以用于执行类似与Select Count(*)的语句
/// </summary>
/// <param name="szSql">SQL语句</param>
/// <returns>返回对象</returns>
public object ExecuteScalar(string szSql)
{
OleDbCommand idCMD = new OleDbCommand(szSql, m_dbConn);
object rObj = idCMD.ExecuteScalar();
idCMD.Dispose();
return rObj;
}
/// <summary>
/// 调用OleDbCommand 的 ExecuteNonQuery
/// </summary>
/// <param name="szSql"></param>
/// <returns></returns>
public int ExecuteNonQuery(string szSql)
{
OleDbCommand idCMD = new OleDbCommand(szSql, m_dbConn);
int iRet = idCMD.ExecuteNonQuery();
idCMD.Dispose();
return iRet;
}
/// <summary>
/// 创建查询用DataSet对象
/// </summary>
/// <param name="szSql">查询SQL语句</param>
/// <param name="szTabName">表名称</param>
/// <returns>已经被填充的DataSet对象</returns>
public DataSet CreateSelectDataSet(string szSql,string szTabName)
{
m_dbAdapter.SelectCommand = new OleDbCommand(szSql,m_dbConn);
DataSet ds = new DataSet();
m_dbAdapter.Fill(ds,szTabName);
return ds;
}
/// <summary>
/// 通过查询语句 创建DataSet对象，返回的对象用于执行插入操作
/// </summary>
/// <param name="szSelectSql">SQL语句</param>
/// <param name="szTabName">表名称</param>
/// <returns>用于插入的DataSet对象</returns>
public DataSet CreateInsertDataSet_bySelect(string szSelectSql,string szTabName)
{
m_dbAdapter.SelectCommand = new OleDbCommand(szSelectSql, m_dbConn);

OleDbCommandBuilder cb = new OleDbCommandBuilder(m_dbAdapter);

DataSet ds = new DataSet();
m_dbAdapter.Fill(ds, szTabName);
m_dbAdapter.RowUpdated = new OleDbRowUpdatedEventHandler(OnRowUpdated_Inserted);
return ds;
}
/// <summary>
/// 通过查询语句 创建DataSet对象，返回的对象用于执行更新操作
/// </summary>
/// <param name="szSelectSql">SQL语句</param>
/// <param name="szTabName">表名称</param>
/// <returns>用于更新的DataSet对象</returns>
public DataSet CreateUpdateDataSet_bySelect(string szSelectSql,string szTabName)
{
m_dbAdapter.SelectCommand = new OleDbCommand(szSelectSql, m_dbConn);

OleDbCommandBuilder cb = new OleDbCommandBuilder(m_dbAdapter);

DataSet ds = new DataSet();
m_dbAdapter.Fill(ds, szTabName);
return ds;
//m_dbAdapter.RowUpdated = new OleDbRowUpdatedEventHandler(OnRowUpdated_Update);
}
//----------------私有事件处理
/// <summary>
/// 处理数据插入的更新事件
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
protected void OnRowUpdated_Inserted(object sender, OleDbRowUpdatedEventArgs args)
{
OleDbCommand idCMD = new OleDbCommand("SELECT @@IDENTITY", m_dbConn);

if (args.StatementType == StatementType.Insert)
{
object rObj = idCMD.ExecuteScalar();
if(rObj == null)
m_iDbIdentity =-1;
else if( rObj.ToString() !="")
m_iDbIdentity = Int32.Parse(rObj.ToString());
else
m_iDbIdentity =-1;
}
idCMD.Dispose();
}
//------------公共属性
/// <summary>
/// 在插入数据后获取新数据行中自增字段的值，目前只能支持一个自增字段
/// </summary>
public Int32 DbIdentity {get{return m_iDbIdentity;} }
/// <summary>
/// 数据库连接字符串,保存在web.config文件中 <appSettings>节
/// </summary>
public string DbString {get{return System.Configuration.ConfigurationSettings.AppSettings["dbStr"];}}

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