/// <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(); } }