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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems, Inc.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <drizzled/foreign_key.h>
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#include <drizzled/error.h>
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#include <drizzled/create_field.h>
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#include <drizzled/internal/my_sys.h>
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#include <drizzled/table_ident.h>
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extern const charset_info_st *system_charset_info;
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void add_foreign_key_to_table_message(
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message::Table *table_message,
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const char* fkey_name,
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List<Key_part_spec> &cols,
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List<Key_part_spec> &ref_cols,
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message::Table::ForeignKeyConstraint::ForeignKeyOption delete_opt_arg,
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message::Table::ForeignKeyConstraint::ForeignKeyOption update_opt_arg,
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message::Table::ForeignKeyConstraint::ForeignKeyMatchOption match_opt_arg)
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message::Table::ForeignKeyConstraint *pfkey= table_message->add_fk_constraint();
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pfkey->set_name(fkey_name);
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else if (table_message->has_name())
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std::string name(table_message->name());
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name.append("_ibfk_");
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snprintf(number, sizeof(number), "%d", table_message->fk_constraint_size());
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pfkey->set_name(name);
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pfkey->set_match(match_opt_arg);
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pfkey->set_update_option(update_opt_arg);
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pfkey->set_delete_option(delete_opt_arg);
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pfkey->set_references_table_name(table->table.str);
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Key_part_spec *keypart;
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List<Key_part_spec>::iterator col_it(cols.begin());
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while ((keypart= col_it++))
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pfkey->add_column_names(keypart->field_name.str);
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List<Key_part_spec>::iterator ref_it(ref_cols.begin());
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while ((keypart= ref_it++))
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pfkey->add_references_columns(keypart->field_name.str);
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Make a deep copy of each list element.
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@note A template function and not a template method of class List
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is employed because of explicit template instantiation:
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in server code there are explicit instantiations of List<T> and
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an explicit instantiation of a template requires that any method
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of the instantiated class used in the template can be resolved.
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Evidently not all template arguments have clone() method with
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@return You must query the error state in Session for out-of-memory
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situation after calling this function.
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void list_copy_and_replace_each_value(List<T> &list, memory::Root *mem_root)
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/* Make a deep copy of each element */
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typename List<T>::iterator it(list.begin());
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it.replace(el->clone(mem_root));
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Foreign_key::Foreign_key(const Foreign_key &rhs, memory::Root *mem_root)
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ref_table(rhs.ref_table),
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ref_columns(rhs.ref_columns),
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delete_opt(rhs.delete_opt),
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update_opt(rhs.update_opt),
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match_opt(rhs.match_opt)
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list_copy_and_replace_each_value(ref_columns, mem_root);
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Test if a foreign key (= generated key) is a prefix of the given key
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(ignoring key name, key type and order of columns)
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This is only used to test if an index for a FOREIGN KEY exists
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We only compare field names
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0 Generated key is a prefix of other key
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bool foreign_key_prefix(Key *a, Key *b)
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/* Ensure that 'a' is the generated key */
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if (b->generated && a->columns.size() > b->columns.size())
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std::swap(a, b); // Put shorter key in 'a'
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return true; // No foreign key
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std::swap(a, b); // Put generated key in 'a'
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/* Test if 'a' is a prefix of 'b' */
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if (a->columns.size() > b->columns.size())
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return true; // Can't be prefix
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List<Key_part_spec>::iterator col_it1(a->columns.begin());
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List<Key_part_spec>::iterator col_it2(b->columns.begin());
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const Key_part_spec *col1, *col2;
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#ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS
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while ((col1= col_it1++))
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col_it2=b->columns.begin();
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while ((col2= col_it2++))
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return true; // Error
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return false; // Is prefix
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while ((col1= col_it1++))
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if (!(*col1 == *col2))
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return false; // Is prefix
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Check if the foreign key options are compatible with columns
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on which the FK is created.
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bool Foreign_key::validate(List<CreateField> &table_fields)
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CreateField *sql_field;
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Key_part_spec *column;
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List<Key_part_spec>::iterator cols(columns.begin());
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List<CreateField>::iterator it(table_fields.begin());
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while ((column= cols++))
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it= table_fields.begin();
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while ((sql_field= it++) &&
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my_strcasecmp(system_charset_info,
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column->field_name.str,
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sql_field->field_name)) {}
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my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), column->field_name.str);
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} /* namespace drizzled */