GetCurrentObject() public method

Gets the current row as a memory object rather than piecemeal.
public GetCurrentObject ( ) : MemoryObject
return MemoryObject
Exemplo n.º 1
0
        /// <summary>
        /// Updates a data object record using the "table" and a list of column/value pairs.
        /// </summary>
        /// <param name="transaction">The transaction to do this as part of.</param>
        /// <param name="mapping">The mapping of the table or other data container we're dealing with.</param>
        /// <param name="crit">All records matching this criteria will be updated per the dictionary of
        ///                    values.</param>
        /// <param name="propValues">A dictionary of column/value pairs for all non-ID columns to be updated.</param>
        /// <returns>The number of records affected.</returns>
        public override int Update(ITransaction transaction, ClassMapping mapping, DaoCriteria crit, IDictionary<string, object> propValues)
        {
            // Since the update might change one of the id fields, we can't just overwrite the
            // table with new values (since that might be an add).  Instead create a temp table,
            // put in everything that doesn't match, then put in everything that does after
            // modifying it.
            DaoCriteria inverseCrit = new DaoCriteria();
            foreach (IExpression expr in crit.Expressions)
            {
                inverseCrit.Expressions.Add(expr.Invert());
            }
            IDictionary<string, MemoryObject> table = GetTable(mapping);
            int retVal = 0;
            lock (table)
            {
                IDictionary<string, MemoryObject> tempTable = new Dictionary<string, MemoryObject>();

                // First the unchanged records.
                MemoryDataReader reader = new MemoryDataReader(this, mapping, inverseCrit,
                                                               table.Values.GetEnumerator());
                while (reader.Read())
                {
                    MemoryObject unchanged = reader.GetCurrentObject();
                    tempTable[unchanged.GetKey()] = unchanged;
                }
                // Now the changed ones.
                reader = new MemoryDataReader(this, mapping, crit, table.Values.GetEnumerator());
                while (reader.Read())
                {
                    MemoryObject changed = reader.GetCurrentObject();
                    // Set the changed values.
                    foreach (KeyValuePair<string, object> kvp in propValues)
                    {
                        changed.ColValues[kvp.Key] = kvp.Value;
                    }
                    tempTable[changed.GetKey()] = changed;
                    retVal++;
                }
                // Now replace the real table contents with the temp ones.
                table.Clear();
                foreach (KeyValuePair<string, MemoryObject> kvp in tempTable)
                {
                    table.Add(kvp);
                }
            }
            return retVal;
        }
Exemplo n.º 2
0
 /// <summary>
 /// Deletes a data object record using the mapping and criteria for what's deleted.
 /// </summary>
 /// <param name="transaction">The transaction to do this as part of.</param>
 /// <param name="mapping">The mapping of the table from which to delete.</param>
 /// <param name="crit">Criteria for deletion.  NOTE: Only the expressions are observed,
 ///                    other things (like "order" or start / limit) are ignored.
 ///                    WARNING: A null or empty (no expression) criteria will 
 ///                    delete ALL records!</param>
 /// <returns>The number of records affected.</returns>
 public override int Delete(ITransaction transaction, ClassMapping mapping, DaoCriteria crit)
 {
     // Find all the records that don't match, and just keep those.
     DaoCriteria inverseCrit = new DaoCriteria();
     foreach (IExpression expr in crit.Expressions)
     {
         inverseCrit.Expressions.Add(expr.Invert());
     }
     IDictionary<string, MemoryObject> table = GetTable(mapping);
     int retVal;
     lock (table)
     {
         int oldCount = table.Count;
         MemoryDataReader reader = new MemoryDataReader(this, mapping, inverseCrit,
                                                        table.Values.GetEnumerator());
         IDictionary<string, MemoryObject> tempTable = new Dictionary<string, MemoryObject>();
         while (reader.Read())
         {
             MemoryObject keeper = reader.GetCurrentObject();
             tempTable[keeper.GetKey()] = keeper;
         }
         table.Clear();
         foreach (KeyValuePair<string, MemoryObject> kvp in tempTable)
         {
             table.Add(kvp);
         }
         retVal = oldCount - table.Count;
     }
     return retVal;
 }