public ReturnStatus Delete(Database database, Table table, ICollection<Filter> filters)
{
string databaseFileName = KeyValue.GetDatabaseFileName(database.Name);
var planner = new SimpleExecutionPlanner(database, repository, new List<Selection>(), new List<Join>(), filters);
var rootOperation = planner.GetRootOperation();
var nonKeyColumnNames = table.Columns.Where(c => !table.PrimaryKey.Contains(c.Name)).Select(c => c.Name).ToList();
var metadata = rootOperation.GetMetadata();
var rows = rootOperation.Execute();
ReturnStatus status = new ReturnStatus();
var indexFactory = new IndexFactory(databaseFileName, repository);
var rowsToDelete = new List<string>();
var rowData = new List<KeyValuePair<string, string>>();
foreach (var row in rows)
{
rowsToDelete.Add(row.Key);
rowData.Add(row);
}
foreach (var row in rowsToDelete)
{
// Check foreign key constraints.
foreach (var association in database.GetAssociationsWhereTableIsParent(table.Name))
{
var indexMeta = table.Indexes.Where(i => i.Name.Equals(association.Name)).Single();
var index = indexFactory.GetIndex(indexMeta);
var foreignKey = string.Empty;
if (index.Exists(row))
{
status.ReturnCode = ReturnCode.ForeignKeyConstraintFailed;
status.Message = string.Format("Foreign key constraint check failed, the key [{0}] is referenced in {1}.", row, association.Child);
return status;
}
}
}
foreach (var row in rowData)
{
// Delete unique indexes.
foreach (var uniqueIndex in table.Indexes.Where(i => i.Unique))
{
var index = indexFactory.GetIndex(uniqueIndex);
var columnValues = new List<string>();
foreach (var column in uniqueIndex.IndexMembers)
{
columnValues.Add(KeyValue.Split(row.Value).ElementAt(KeyValue.Split(metadata.Value).ToList().IndexOf(column)));
}
var uniqueKey = KeyValue.Concatenate(columnValues);
index.Delete(uniqueKey);
}
// Delete foreign key indexes.
foreach (var association in database.GetAssociationsWhereTableIsChild(table.Name))
{
var parentTable = database.GetTable(association.Parent);
var indexMeta = parentTable.Indexes.Where(i => i.Name.Equals(association.Name)).Single();
var index = indexFactory.GetIndex(indexMeta);
var foreignKey = string.Empty;
if (table.PrimaryKey.Contains(association.ColumnMappings.Values.First()))
{
foreignKey = KeyValue.Split(row.Key).ElementAt(table.PrimaryKey.IndexOf(association.ColumnMappings.Values.First()));
}
else
{
foreignKey = KeyValue.Split(row.Value).ElementAt(nonKeyColumnNames.IndexOf(association.ColumnMappings.Values.First()));
}
index.Delete(foreignKey, row.Key);
}
}
foreach (var rowToDelete in rowsToDelete)
{
// Delete primary key and data.
repository.Delete(databaseFileName, table.Name, rowToDelete);
}
status.ReturnCode = ReturnCode.Success;
status.Message = string.Format("({0} row(s) affected)", rowsToDelete.Count);
return status;
}
private KeyValuePair<Filter, IConcreteIndex> TryGetFilterWithIndex(ICollection<Filter> sameTableFilters)
{
var indexFactory = new IndexFactory(KeyValue.GetDatabaseFileName(database.Name), repository);
var table = database.Tables.Single(t => t.Name == sameTableFilters.First().Table);
foreach (var filter in sameTableFilters)
{
var associations = database.Associations.Where(a => a.Child == table.Name && a.ColumnMappings.Values.Contains(filter.Column) && a.ColumnMappings.Count == 1);
if (associations.Any())
{
var association = associations.First();
var parentTable = database.Tables.Single(t => t.Name == association.Parent);
var indexMeta = parentTable.Indexes.Where(i => i.Name.Equals(association.Name)).Single();
var index = indexFactory.GetIndex(indexMeta);
return new KeyValuePair<Filter, IConcreteIndex>(filter, index);
}
}
return new KeyValuePair<Filter, IConcreteIndex>(filters.First(), null);
}
public ReturnStatus Insert(Database database, Table table, ICollection<string> keyMembers, ICollection<string> values)
{
string databaseFileName = KeyValue.GetDatabaseFileName(database.Name);
string key = KeyValue.Concatenate(keyMembers);
string value = KeyValue.Concatenate(values);
ReturnStatus status = new ReturnStatus();
// Check primary key constraints.
if (repository.Exists(databaseFileName, table.Name, key))
{
status.ReturnCode = ReturnCode.PrimaryKeyConstraintFailed;
status.Message = string.Format("Primary key constraint check failed for primary key: {0}", key);
return status;
}
// Check unique index constraints.
var uniqueIndexes = new IConcreteIndex[table.Indexes.Where(i => i.Unique).Count()];
var uniqueIndexKeys = new string[table.Indexes.Where(i => i.Unique).Count()];
var indexFactory = new IndexFactory(databaseFileName, repository);
var counter = 0;
var nonKeyColumnNames = table.Columns.Where(c => !table.PrimaryKey.Contains(c.Name)).Select(c => c.Name).ToList();
foreach (var uniqueIndex in table.Indexes.Where(i => i.Unique))
{
var index = indexFactory.GetIndex(uniqueIndex);
uniqueIndexes[counter] = index;
var columnValues = new List<string>();
foreach (var column in uniqueIndex.IndexMembers)
{
columnValues.Add(values.ElementAt(nonKeyColumnNames.IndexOf(column)));
}
var uniqueKey = KeyValue.Concatenate(columnValues);
uniqueIndexKeys[counter] = uniqueKey;
if (index.Exists(uniqueKey))
{
status.ReturnCode = ReturnCode.UniqueConstraintFailed;
status.Message = string.Format("Unique constraint check failed for key: {0}", uniqueKey);
return status;
}
counter++;
}
// Check foreign key constraints (the key is simple).
// Check if the key exists in the parent table.
var foreignKeyIndexes = new IConcreteIndex[database.GetAssociationsWhereTableIsChild(table.Name).Count()];
var foreignKeyIndexKeys = new string[database.GetAssociationsWhereTableIsChild(table.Name).Count()];
counter = 0;
foreach (var association in database.GetAssociationsWhereTableIsChild(table.Name))
{
var parentTable = database.GetTable(association.Parent);
var indexMeta = parentTable.Indexes.Where(i => i.Name.Equals(association.Name)).Single();
var index = indexFactory.GetIndex(indexMeta);
var foreignKey = string.Empty;
if (table.PrimaryKey.Contains(association.ColumnMappings.Values.First()))
{
foreignKey = keyMembers.ElementAt(table.PrimaryKey.IndexOf(association.ColumnMappings.Values.First()));
}
else
{
foreignKey = values.ElementAt(nonKeyColumnNames.IndexOf(association.ColumnMappings.Values.First()));
}
foreignKeyIndexes[counter] = index;
foreignKeyIndexKeys[counter] = foreignKey;
if (!repository.Exists(databaseFileName, parentTable.Name, foreignKey))
{
status.ReturnCode = ReturnCode.ForeignKeyConstraintFailed;
status.Message = string.Format("Foreign key constraint check failed, key is missing from the parent table ({0} [{1}]): {2}", parentTable.Name,
association.ColumnMappings.Keys.First(), foreignKey);
return status;
}
counter++;
}
// Insert unique indexes.
for (int k = 0; k < uniqueIndexes.Length; k++)
{
uniqueIndexes[k].Put(uniqueIndexKeys[k], key);
}
// Insert foreign key indexes.
for (int k = 0; k < foreignKeyIndexes.Length; k++)
{
foreignKeyIndexes[k].Put(foreignKeyIndexKeys[k], key);
}
// Insert row if there is no errors.
repository.Put(databaseFileName, table.Name, key, value);
status.ReturnCode = ReturnCode.Success;
status.Message = string.Format("({0} row(s) affected)", 1);
return status;
}
