public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
// check...
SqlDatabaseDefault other = (SqlDatabaseDefault)obj;
if (other.Value == null && this.Value == null)
{
return(true);
}
if (other.Value != null && this.Value == null)
{
return(false);
}
if (other.Value == null && this.Value != null)
{
return(false);
}
if (!other.Type.Equals(this.Type))
{
return(false);
}
if (!other.Value.Equals(this.Value))
{
return(false);
}
// ok...
return(true);
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="column"></param>
internal AlterColumnSchemaWorkUnit(EntityType entityType, SqlColumn column, DbType type, long length,
bool isLarge, bool isNullable, SqlDatabaseDefault defaultExpression, string reason) : base(entityType, column)
{
_type = type;
_length = length;
_isLarge = isLarge;
_isNullable = isNullable;
// set...
SetReason(reason);
}
/// <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);
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="column"></param>
internal AddConstraintSchemaWorkUnit(EntityType entityType, SqlColumn column, SqlDatabaseDefault defaultExpression) : base(entityType, column)
{
_defaultExpression = defaultExpression;
}