Array排序函数

 /// <summary>
 /// Array 的摘要说明。
 /// </summary>
 public class Array
 {
  public Array()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }

  /// <summary>
  /// 取得排序数组的最后一数＋1
  /// </summary>
  /// <param name="table">数据表名</param>
  /// <param name="strWhere">排序数组的筛选条件</param>
  /// <returns>排序数组的最后一数＋1</returns>
  public static int GetNewLastArrayNum(string table,string strWhere)
  {
   if(strWhere != ""){strWhere = " Where " + strWhere;}

   Database db = DatabaseFactory.CreateDatabase();
   string sql="select max(Array) From " + table + strWhere;
   IDataReader reader = db.ExecuteReader(CommandType.Text,sql);
   if(reader.Read())
    if(reader[0] != DBNull.Value)
     return Convert.ToInt32(reader[0])+1;
    else
     return 1;
   else
    return 1;
  }

  /// <summary>
  /// 更新数据表中的排列序号
  /// </summary>
  /// <param name="sqlTableName">数据表名</param>
  /// <param name="strWhere">排序数组的筛选条件</param>
  /// <param name="idFieldName">标识的列名，如ID</param>
  /// <param name="id">当前触发时的ID</param>
  /// <param name="array">当前触发时的排序值</param>
  public static void UpArrayNum(string sqlTableName,string strWhere,string idFieldName,int id,int array)
  {
   string strWhereNow = "";
   if(strWhere != ""){strWhereNow = " and " + strWhere;}
   int newArray;
   int newID;
   string upSql="";

   Database db = DatabaseFactory.CreateDatabase();
   string sql="select " + idFieldName + ",Array From " + sqlTableName + " Where " + idFieldName + "<>" + id +
    strWhereNow + " And Array="+array;
   IDataReader reader = db.ExecuteReader(CommandType.Text,sql);

   if(reader.Read())
   {
    upSql="UpDate " + sqlTableName + " Set Array=Array+1 Where " + idFieldName + "=" +
     Convert.ToInt32(reader[idFieldName]) + strWhereNow;
    newArray = Convert.ToInt32(reader["Array"])+1;
    newID = Convert.ToInt32(reader[idFieldName]);
    reader.Close();

    db.ExecuteNonQuery(CommandType.Text,upSql);

    UpArrayNum(sqlTableName,strWhere,idFieldName,newID,newArray);
   }
   else
   {
    reader.Close();
    return;
   }
  } 
 }