/// <summary>
/// Removes a SqlChildToParentLink item to the collection.
/// </summary>
/// <param name="item">The item to remove.</param>
public void Remove(SqlChildToParentLink item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
List.Remove(item);
}
/// <summary>
/// Adds a SqlChildToParentLink instance to the collection.
/// </summary>
/// <param name="item">The item to add.</param>
public void Add(SqlChildToParentLink item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
this.AssignItem(item);
List.Add(item);
}
/// <summary>
/// Inserts a SqlChildToParentLink instance into the collection.
/// </summary>
/// <param name="item">The item to add.</param>
public void Insert(int index, SqlChildToParentLink item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
this.AssignItem(item);
List.Insert(index, item);
}
/// <summary>
/// Assigns an item.
/// </summary>
/// <param name="item"></param>
private void AssignItem(SqlChildToParentLink item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (this.Table != null)
{
item.SetTable(this.Table);
}
}
/// <summary>
/// Discovers if the given item is in the collection.
/// </summary>
/// <param name="item">The item to find.</param>
/// <returns>Returns true if the given item is in the collection.</returns>
public bool Contains(SqlChildToParentLink item)
{
if (IndexOf(item) == -1)
{
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="foreignKey"></param>
internal CreateForeignKeySchemaWorkUnit(EntityType entityType, SqlChildToParentLink foreignKey) : base(entityType)
{
_foreignKey = foreignKey;
}
/// <summary>
/// Gets the schema work units specific to this table.
/// </summary>
/// <param name="existingTable"></param>
/// <returns></returns>
internal WorkUnitCollection GetSchemaWorkUnits(SqlTable existingTable)
{
if (_entityType == null)
{
throw new ArgumentNullException("entityType");
}
if (existingTable == null)
{
throw new ArgumentNullException("existingTable");
}
// results...
WorkUnitCollection results = new WorkUnitCollection();
// Removed indexes.
SqlIndexCollection removedIndexes = new SqlIndexCollection();
// Removed indexes.
SqlChildToParentLinkCollection removedForeignKeys = new SqlChildToParentLinkCollection();
// find missing columns...
foreach (SqlColumn column in this.Columns)
{
SqlColumn existingColumn = null;
foreach (SqlColumn scanColumn in existingTable.Columns)
{
if (string.Compare(column.NativeName, scanColumn.NativeName, true, System.Globalization.CultureInfo.InvariantCulture) == 0)
{
existingColumn = scanColumn;
break;
}
}
// found?
if (existingColumn == null)
{
results.Add(new AddColumnSchemaWorkUnit(_entityType, column));
}
else
{
// get the new column metrics. this is tricky, because if the length changes to be less than what it was,
// we don't want to change the length, but we might want to change other metrics.
bool changed = false;
string reason = null;
// check...
long newLength = existingColumn.Length;
if (column.Length > newLength && newLength != -1)
{
newLength = column.Length;
// mbr - 24-07-2007 - case 321 - added reason...
changed = true;
reason = string.Format("Length changed from {0} to {1}", existingColumn.Length, column.Length);
}
// flags?
bool newIsNullable = false;
if (!(existingColumn.IsKey))
{
newIsNullable = existingColumn.IsNullable;
if (column.IsNullable != newIsNullable)
{
newIsNullable = column.IsNullable;
// mbr - 24-07-2007 - case 321 - added reason...
changed = true;
reason = string.Format("Nullability changed to '{0}'", column.IsNullable);
}
}
else
{
newIsNullable = false;
}
// type...
DbType newType = existingColumn.DbType;
bool newIsLarge = existingColumn.IsLarge;
if (column.DbType != newType || column.IsLarge != newIsLarge)
{
// mbr - 24-07-2007 - case 308 - this didn't do anything, hence have changed the code
// to the original intention - i.e. if something was an int and it's now a string, it will try and
// convert. the original meaning of CanUpgradeType was to make sure the fx knew how
// to go from
// // are the compatible?
// bool ok = false;
// try
// {
// this.CanUpgradeType(newType, newIsLarge, column.DbType, column.IsLarge);
// }
// catch(Exception ex)
// {
// throw new InvalidOperationException(string.Format("Failed to check upgradability of '{0}' on '{1}'.", column, column.Table), ex);
// }
// can we?
//if(ok)
{
newType = column.DbType;
newIsLarge = column.IsLarge;
// mbr - 24-07-2007 - case 321 - added reason...
changed = true;
string fromAsString = existingColumn.DbType.ToString();
if (existingColumn.IsLarge)
{
fromAsString += " (large)";
}
string toAsString = column.DbType.ToString();
if (column.IsLarge)
{
toAsString += " (large)";
}
reason = string.Format("Type changed from '{0}' to '{1}'", fromAsString, toAsString);
}
}
// now check the default default...
SqlDatabaseDefault existingDefault = existingColumn.DefaultExpression;
SqlDatabaseDefault newDefault = column.DefaultExpression;
// alter...
if (changed && !(column.IsLarge))
{
// Now we can check the indexes are on this column as they need to be removed
foreach (SqlIndex index in existingTable.Indexes)
{
if (index.Columns.Contains(column.NativeName))
{
removedIndexes.Add(index);
results.Add(new DropIndexSchemaWorkUnit(_entityType, existingTable, index));
}
}
// Now we can check the foreign keys are on this column as they need to be removed
foreach (SqlChildToParentLink foreignKey in existingTable.LinksToParents)
{
if (foreignKey.Columns.Contains(column.NativeName))
{
removedForeignKeys.Add(foreignKey);
results.Add(new DropForeignKeySchemaWorkUnit(_entityType, foreignKey));
}
}
// mbr - 24-07-2007 - case 321 - added reason.
results.Add(new AlterColumnSchemaWorkUnit(_entityType, column, newType, newLength,
newIsLarge, newIsNullable, newDefault, reason));
}
if (((existingDefault != null && newDefault == null) || (existingDefault == null && newDefault != null)) ||
(existingDefault != null && newDefault != null && !(existingDefault.Equals(newDefault))))
{
if (existingDefault != null)
{
results.Add(new DropConstraintSchemaWorkUnit(_entityType, column, existingDefault));
}
if (newDefault != null)
{
results.Add(new AddConstraintSchemaWorkUnit(_entityType, column, newDefault));
}
}
}
}
// Check existing indexes
foreach (SqlIndex index in Indexes)
{
SqlIndex existingIndex = null;
foreach (SqlIndex scanIndex in existingTable.Indexes)
{
//
if (string.Compare(scanIndex.NativeName, index.NativeName, true, System.Globalization.CultureInfo.InvariantCulture) == 0)
{
// mbr - 2011-11-02 - do we need to drop it?
if (!(scanIndex.DoesMatch(index)))
{
// drop...
results.Add(new DropIndexSchemaWorkUnit(_entityType, this, index));
}
else
{
// create...
existingIndex = scanIndex;
}
// stop...
break;
}
}
// found?
if (existingIndex == null || removedIndexes[existingIndex.Name] != null)
{
results.Add(new CreateIndexSchemaWorkUnit(_entityType, this, index));
}
}
// Check existing foreign keys
foreach (SqlChildToParentLink foreignKey in LinksToParents)
{
SqlChildToParentLink existingForeignKey = null;
foreach (SqlChildToParentLink scanForeignKey in existingTable.LinksToParents)
{
//
if (string.Compare(scanForeignKey.NativeName, foreignKey.NativeName, true, System.Globalization.CultureInfo.InvariantCulture) == 0)
{
existingForeignKey = scanForeignKey;
break;
}
}
// found?
if (existingForeignKey == null || removedIndexes[existingForeignKey.Name] != null)
{
// mbr - 04-10-2007 - case 825 - only do this if the parent is referenced in the schema...
if (Schema == null)
{
throw new InvalidOperationException("Schema is null.");
}
bool ok = foreignKey.IsSupported(this.Schema);
// ok?
if (ok)
{
results.Add(new CreateForeignKeySchemaWorkUnit(_entityType, foreignKey));
}
}
}
// return...
return(results);
}
internal override void Merge(XmlElement element, bool createIfNotFound)
{
base.Merge(element, createIfNotFound);
// walk tables...
foreach (XmlElement columnElement in element.SelectNodes("Columns/SqlColumn"))
{
// get the name...
string nativeName = XmlHelper.GetElementString(columnElement, "NativeName", OnNotFound.ThrowException);
if (nativeName == null)
{
throw new InvalidOperationException("'nativeName' is null.");
}
if (nativeName.Length == 0)
{
throw new InvalidOperationException("'nativeName' is zero-length.");
}
// get...
SqlColumn column = this.Columns[nativeName];
if (column == null && createIfNotFound)
{
column = new SqlColumn(nativeName, DbType.Int32, -1, EntityFieldFlags.Normal);
this.Columns.Add(column);
}
// add...
if (column != null)
{
column.Merge(columnElement, createIfNotFound);
}
}
// walk the links...
foreach (XmlElement linkElement in element.SelectNodes("ChildToParentLinks/SqlChildToParentLink"))
{
// get...
string nativeName = XmlHelper.GetElementString(linkElement, "NativeName", OnNotFound.ReturnNull);
if (nativeName == null)
{
throw new InvalidOperationException("'nativeName' is null.");
}
if (nativeName.Length == 0)
{
throw new InvalidOperationException("'nativeName' is zero-length.");
}
// find it...
SqlChildToParentLink link = this.LinksToParents[nativeName];
if (link == null && createIfNotFound)
{
link = new SqlChildToParentLink(nativeName, this);
this.LinksToParents.Add(link);
}
// add....
if (link != null)
{
link.Merge(linkElement, createIfNotFound);
}
}
// mbr - 21-09-2007 - do we actually have modifiers?
string modifiersAsString = XmlHelper.GetElementString(element, "Modifiers", OnNotFound.ReturnNull);
if (modifiersAsString != null && modifiersAsString.Length > 0)
{
this.Modifiers = (TableModifiers)Enum.Parse(typeof(TableModifiers), modifiersAsString, true);
}
// xml...
var asString = element.GetElementString("GenerateDto", OnNotFound.ReturnNull);
if (!(string.IsNullOrEmpty(asString)))
{
this.GenerateDto = ConversionHelper.ToBoolean(asString);
}
else
{
this.GenerateDto = false;
}
}
/// <summary>
/// Returns the index of the item in the collection.
/// </summary>
/// <param name="item">The item to find.</param>
/// <returns>The index of the item, or -1 if it is not found.</returns>
public int IndexOf(SqlChildToParentLink item)
{
return(List.IndexOf(item));
}
