/// <summary>
/// Generate the SQL DELETE that deletes a particular row
/// </summary>
/// <returns></returns>
protected override SqlCommandInfo GenerateDeleteRowString()
{
SqlDeleteBuilder delete = new SqlDeleteBuilder(Factory.Dialect, Factory);
delete.SetTableName(qualifiedTableName);
if (hasIdentifier)
{
delete.AddWhereFragment(new string[] { IdentifierColumnName }, IdentifierType, " = ");
}
else if (HasIndex && !indexContainsFormula)
{
delete
.AddWhereFragment(KeyColumnNames, KeyType, " = ")
.AddWhereFragment(IndexColumnNames, IndexType, " = ");
}
else
{
string[] cnames = ArrayHelper.Join(KeyColumnNames, ElementColumnNames, elementColumnIsInPrimaryKey);
SqlType[] ctypes = ArrayHelper.Join(KeyType.SqlTypes(Factory), ElementType.SqlTypes(Factory), elementColumnIsInPrimaryKey);
delete.AddWhereFragment(cnames, ctypes, " = ");
}
if (Factory.Settings.IsCommentsEnabled)
delete.SetComment("delete collection row " + Role);
return delete.ToSqlCommandInfo();
}
/// <summary>
/// Generate the SQL DELETE that deletes all rows
/// </summary>
/// <returns></returns>
protected override SqlCommandInfo GenerateDeleteString()
{
SqlDeleteBuilder delete = new SqlDeleteBuilder(Factory.Dialect, Factory)
.SetTableName(qualifiedTableName)
.SetIdentityColumn(KeyColumnNames, KeyType);
if (HasWhere)
delete.AddWhereFragment(sqlWhereString);
if (Factory.Settings.IsCommentsEnabled)
delete.SetComment("delete collection " + Role);
return delete.ToSqlCommandInfo();
}
/// <inheritdoc />
protected override SqlCommandInfo GenerateDeleteRowString(bool[] columnNullness)
{
var delete = new SqlDeleteBuilder(Factory.Dialect, Factory);
delete.SetTableName(qualifiedTableName);
if (hasIdentifier)
{
delete.AddWhereFragment(new[] { IdentifierColumnName }, IdentifierType, " = ");
}
else
{
var useIndex = HasIndex && !indexContainsFormula;
var additionalFilterType = useIndex ? IndexType : ElementType;
var additionalFilterColumns = useIndex ? IndexColumnNames : ElementColumnNames;
var includes = useIndex ? null : Combine(elementColumnIsInPrimaryKey, columnNullness);
var cnames = includes == null
? ArrayHelper.Join(KeyColumnNames, additionalFilterColumns)
: ArrayHelper.Join(KeyColumnNames, additionalFilterColumns, includes);
var ctypes = includes == null
? ArrayHelper.Join(KeyType.SqlTypes(Factory), additionalFilterType.SqlTypes(Factory))
: ArrayHelper.Join(KeyType.SqlTypes(Factory), additionalFilterType.SqlTypes(Factory), includes);
delete.AddWhereFragment(cnames, ctypes, " = ");
if (columnNullness != null)
{
for (var i = 0; i < columnNullness.Length; i++)
{
if (columnNullness[i])
{
continue;
}
delete.AddWhereFragment($"{additionalFilterColumns[i]} is null");
}
}
}
if (Factory.Settings.IsCommentsEnabled)
{
delete.SetComment("delete collection row " + Role);
}
return(delete.ToSqlCommandInfo());
}
public MultiTableDeleteExecutor(IStatement statement)
: base(statement, log)
{
if (!Factory.Dialect.SupportsTemporaryTables)
{
throw new HibernateException("cannot perform multi-table deletes using dialect not supporting temp tables");
}
var deleteStatement = (DeleteStatement)statement;
FromElement fromElement = deleteStatement.FromClause.GetFromElement();
string bulkTargetAlias = fromElement.TableAlias;
persister = fromElement.Queryable;
idInsertSelect = GenerateIdInsertSelect(persister, bulkTargetAlias, deleteStatement.WhereClause);
log.Debug("Generated ID-INSERT-SELECT SQL (multi-table delete) : {0}", idInsertSelect);
string[] tableNames = persister.ConstraintOrderedTableNameClosure;
string[][] columnNames = persister.ConstraintOrderedTableKeyColumnClosure;
string idSubselect = GenerateIdSubselect(persister);
deletes = new SqlString[tableNames.Length];
for (int i = tableNames.Length - 1; i >= 0; i--)
{
// TODO : an optimization here would be to consider cascade deletes and not gen those delete statements;
// the difficulty is the ordering of the tables here vs the cascade attributes on the persisters ->
// the table info gotten here should really be self-contained (i.e., a class representation
// defining all the needed attributes), then we could then get an array of those
SqlDeleteBuilder delete = new SqlDeleteBuilder(Factory.Dialect, Factory)
.SetTableName(tableNames[i])
.SetWhere("(" + string.Join(", ", columnNames[i]) + ") IN (" + idSubselect + ")");
if (Factory.Settings.IsCommentsEnabled)
{
delete.SetComment("bulk delete");
}
deletes[i] = delete.ToSqlString();
}
}
