public static IList FetchHistory()
{
// initialize
History item = new History();
PropertyInfo[] p = item.GetType().GetProperties();
List<History> list = new List<History>();
string qryString = "SELECT * FROM HISTORY_LOG";
User user = (User)System.Web.HttpContext.Current.Session[Constant.session.User];
IDBManager dbmgr = new DBManager(user.plantDBStr);
dbmgr.ConnectionString = user.plantDBStr;
try
{
dbmgr.Open();
dbmgr.ExecuteReader(CommandType.Text, qryString);
while (dbmgr.DataReader.Read())
{
item = new History();
item = (History)FetchObject(item, p, dbmgr);
list.Add(item);
}
}
catch (Exception ex)
{
throw (ex);
}
finally
{
dbmgr.Dispose();
}
return list;
}
// procedure saves object to history
// definition of variables passed:
// obj : current object
// old_obj : old object prior to update
// table_chg : name of table that was changed
// data_chg : data that was changed
// key_field : name of key_field (column) within table
// (eg. changes in COMPLIST will have COMP as key_field, changes in CABLIST will have CABLE
// dbmgr : database manager
// fieldlist : list of fields that were involved
// (this is needed because more fields may exisit for a given entity than was changed in webform)
public void SaveHistory(Object obj, Object old_obj, string user_id, string table_chg, string data_chg, string key_field, IDBManager dbmgr, string[] fieldList)
{
History hist; // create new entity
ArrayList listChgs = new ArrayList(); // array to hold list of changes
// determine type of change: addition, deletion or modification
// and set values accordingly
// ADDITION: if old_obj is null then user entering a new record
if (old_obj == null)
{
hist = new History(); // create new instance
hist.field_chg = "RECORD ADDED"; // new record added
hist.new_data = data_chg;
hist.old_data = ""; // old data is null
hist.user_id = user_id;
hist.table_chg = table_chg;
hist.key_field = key_field;
listChgs.Add(hist); // add to arraylist
}
// DELETION: if obj is null then user deleting a record
else if (obj == null)
{
hist = new History(); // create new instance
hist.field_chg = "RECORD DELETED"; // record deleted
hist.new_data = ""; // new data is null
hist.old_data = data_chg;
hist.user_id = user_id;
hist.table_chg = table_chg;
hist.key_field = key_field;
listChgs.Add(hist); // add to arraylist
}
// MODIFICATION: otherwise user is modifying an existing record
else
{
PropertyInfo[] properties = obj.GetType().GetProperties();
foreach (PropertyInfo info in properties)
{
// initialize by setting new and old data to empty string
string new_data = "";
string old_data = "";
// properties that are *list or arg* are used base properties used only for application
// these will not exist in table therefore screen for these
if (!info.PropertyType.Name.Contains("list") && !info.Name.Contains("arg"))
{
// check to see if control for given name
if (ControlExists(info.Name, fieldList))
{
if (info.GetValue(old_obj, null) != null)
old_data = info.GetValue(old_obj, null).ToString();
if (info.GetValue(obj, null) != null)
new_data = info.GetValue(obj, null).ToString();
// if the new and old data are not equal to one another
if (!new_data.Equals(old_data))
{
hist = new History(); // create new instance
hist.new_data = new_data;
hist.old_data = old_data;
hist.field_chg = info.Name.ToUpper(); // set field changed (convert to upper case)
hist.user_id = user_id;
hist.table_chg = table_chg;
hist.key_field = key_field;
listChgs.Add(hist); // add to arraylist
}
}
}
}
}
// update HISTORY_LOG table as long as there is changes
if (listChgs.Count > 0)
{
foreach (History h in listChgs)
{
try
{
dbmgr.CreateParameters(6);
dbmgr.AddParameters(0, "@user_id", h.user_id);
dbmgr.AddParameters(1, "@field_chg", h.field_chg);
dbmgr.AddParameters(2, "@new_data", h.new_data);
dbmgr.AddParameters(3, "@old_data", h.old_data);
dbmgr.AddParameters(4, "@table_chg", h.table_chg);
dbmgr.AddParameters(5, "@key_field", h.key_field);
dbmgr.ExecuteNonQuery(System.Data.CommandType.StoredProcedure, "HISTORY_LOG_i");
}
catch (Exception ex)
{
throw (ex);
}
}
}
}
