/// <summary>
/// Add a column to the data set in memory. This is useful when stored procedures used for
/// saving data require optional parameters.
/// <para>The new column will act just like a real SQL data column, and you may
/// want to add a faux SQL data type to its properties, as well as any other
/// properties, so that you can manipulate it properly.</para>
/// </summary>
/// <example>
/// <code>
/// using Argentini.Halide;
/// ...
/// H3DataRow dataRow = new H3DataRow("SELECT TOP 1 * FROM Content WHERE ID=5;", "SqlServer01");
/// dataRow.Column.AddColumn("YourAge", "30");
/// dataRow["YourAge"].ColumnSQLType = "bigint";
/// </code>
/// </example>
/// <param name="colName">Name of the new column.</param>
/// <param name="colValue">Value of the new column.</param>
/// <returns>true if successful, false if not.</returns>
public Boolean AddColumn(String colName, String colValue)
{
bool retVal = false;
int oldFieldCount = _fieldCount;
String newVal = colValue;
String columnName = colName.ToLower();
if (String.IsNullOrEmpty(newVal))
newVal = "";
if (!String.IsNullOrEmpty(columnName))
{
try
{
#region COPY DATA INTO NEW ARRAY, ONE LARGER THAN CURRENT
DatabaseItem[] _dataItemsX;
_dataItemsX = new DatabaseItem[_fieldCount + 1];
for (int x = 0; x < _fieldCount; x++)
{
_dataItemsX[x] = new DatabaseItem();
_dataItemsX[x] = _dataItems[x];
}
#endregion
#region ADD NEW ENTRY TO END OF NEW ARRAY
_dataItemsX[_fieldCount] = new DatabaseItem();
_dataItemsX[_fieldCount].ColumnName = columnName;
_dataItemsX[_fieldCount].Value = newVal;
_dataItemsX[_fieldCount].ColumnSize = 0;
_dataItemsX[_fieldCount].ColumnSQLType = "";
_dataItemsX[_fieldCount].IsAutoIncrementing = false;
_dataItemsX[_fieldCount].IsIdentity = false;
_dataItemsX[_fieldCount].IsNullable = false;
_dataItemsX[_fieldCount].IsPrimaryKey = false;
_dataItemsX[_fieldCount].SystemDataType = "";
_dataIndex.Add(columnName, _fieldCount);
_fieldCount++;
#endregion
#region ENLARGE OLD ARRAY; COPY NEW ARRAY BACK INTO OLD ONE
_dataItems = new DatabaseItem[_fieldCount];
for (int x = 0; x < _fieldCount; x++)
{
_dataItems[x] = new DatabaseItem();
_dataItems[x] = _dataItemsX[x];
}
#endregion
retVal = true;
}
catch
{
_fieldCount = oldFieldCount;
}
}
return retVal;
}
/// <summary>
/// Delete a column from the data set in memory.
/// </summary>
/// <example>
/// <code>
/// using Argentini.Halide;
/// ...
/// H3DataRow dataRow = new H3DataRow("SELECT TOP 1 * FROM Content WHERE ID=5;", "SqlServer01");
/// dataRow.Column.DeleteColumn("MyAge");
/// </code>
/// </example>
/// <param name="colName">Name of the column to delete.</param>
/// <returns>true if successful, false if not.</returns>
public Boolean DeleteColumn(String colName)
{
bool retVal = false;
int oldFieldCount = _fieldCount;
String columnName = colName.ToLower();
if (!String.IsNullOrEmpty(columnName))
{
if (_dataIndex[columnName] != null)
{
try
{
#region COPY DATA INTO NEW ARRAY, EXCEPT FOR DELETED COLUMN
DatabaseItem[] _dataItemsX;
_dataItemsX = new DatabaseItem[_fieldCount - 1];
_dataIndex.Clear();
int counter = 0;
for (int x = 0; x < _fieldCount; x++)
{
if (_dataItems[x].ColumnName != columnName)
{
_dataItemsX[counter] = new DatabaseItem();
_dataItemsX[counter] = _dataItems[x];
_dataIndex.Add(_dataItemsX[counter].ColumnName, counter);
counter++;
}
}
#endregion
#region RESIZE OLD ARRAY; COPY NEW ARRAY BACK INTO OLD ONE
_fieldCount--;
_dataItems = new DatabaseItem[_fieldCount];
for (int x = 0; x < _fieldCount; x++)
{
_dataItems[x] = new DatabaseItem();
_dataItems[x] = _dataItemsX[x];
}
#endregion
retVal = true;
}
catch
{
_fieldCount = oldFieldCount;
}
}
}
return retVal;
}
/// <summary>
/// Initialize the DatabaseRow with a single row form a Halide.H3Reader object.
/// </summary>
/// <param name="reader">An open Halide.H3Reader object that can be used to read a row from a database.</param>
public DatabaseRow(H3Reader reader)
{
_fieldCount = reader.FieldCount;
try
{
_dataItems = new DatabaseItem[_fieldCount];
if (_dataIndex != null) _dataIndex.Clear();
for (int x = 0; x < _fieldCount; x++)
{
_dataItems[x] = new DatabaseItem();
String columnName = reader.ColumnName(x).ToLower();
_dataIndex.Add(columnName, x);
_dataItems[x].IsNullable = reader.GetColumnAllowNulls(columnName);
_dataItems[x].ColumnName = columnName;
_dataItems[x].ColumnSize = reader.GetColumnSize(columnName);
_dataItems[x].ColumnSQLType = reader.GetDataTypeName(columnName).ToLower();
_dataItems[x].IsAutoIncrementing = reader.GetColumnIsAutoIncrement(columnName);
_dataItems[x].IsIdentity = reader.GetColumnIsIdentity(columnName);
_dataItems[x].IsPrimaryKey = reader.GetColumnIsKey(columnName);
_dataItems[x].SystemDataType = reader.GetColumnSystemDataType(columnName).ToLower();
_dataItems[x].Value = reader.GetString(columnName);
}
}
catch
{
}
}
