~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef DRIZZLED_SQL_BASE_H

#define DRIZZLED_SQL_BASE_H

#include <drizzled/table.h>

namespace drizzled

{

class TableShare;

class Name_resolution_context;

void table_cache_free(void);

bool table_cache_init(void);

uint32_t cached_open_tables(void);

uint32_t cached_table_definitions(void);

HASH *get_open_cache();

void kill_drizzle(void);

/* sql_base.cc */

void set_item_name(Item *item,char *pos,uint32_t length);

bool add_field_to_list(Session *session, LEX_STRING *field_name, enum enum_field_types type,

                       char *length, char *decimal,

                       uint32_t type_modifier,

                       enum column_format_type column_format,

                       Item *default_value, Item *on_update_value,

                       LEX_STRING *comment,

                       char *change, List<String> *interval_list,

                       const CHARSET_INFO * const cs);

CreateField * new_create_field(Session *session, char *field_name, enum_field_types type,

                               char *length, char *decimals,

                               uint32_t type_modifier,

                               Item *default_value, Item *on_update_value,

                               LEX_STRING *comment, char *change,

                               List<String> *interval_list, CHARSET_INFO *cs);

void store_position_for_column(const char *name);

bool push_new_name_resolution_context(Session *session,

                                      TableList *left_op,

                                      TableList *right_op);

void add_join_on(TableList *b,Item *expr);

void add_join_natural(TableList *a,TableList *b,List<String> *using_fields,

                      Select_Lex *lex);

extern Item **not_found_item;

/**

  A set of constants used for checking non aggregated fields and sum

  functions mixture in the ONLY_FULL_GROUP_BY_MODE.

*/

enum enum_group_by_mode_type

{

  NON_AGG_FIELD_USED= 0,

  SUM_FUNC_USED

};

/**

  This enumeration type is used only by the function find_item_in_list

  to return the info on how an item has been resolved against a list

  of possibly aliased items.

  The item can be resolved:

   - against an alias name of the list's element (RESOLVED_AGAINST_ALIAS)

   - against non-aliased field name of the list  (RESOLVED_WITH_NO_ALIAS)

   - against an aliased field name of the list   (RESOLVED_BEHIND_ALIAS)

   - ignoring the alias name in cases when SQL requires to ignore aliases

     (e.g. when the resolved field reference contains a table name or

     when the resolved item is an expression)   (RESOLVED_IGNORING_ALIAS)

*/

enum enum_resolution_type {

  NOT_RESOLVED=0,

  RESOLVED_IGNORING_ALIAS,

  RESOLVED_BEHIND_ALIAS,

  RESOLVED_WITH_NO_ALIAS,

  RESOLVED_AGAINST_ALIAS

};

Item ** find_item_in_list(Item *item, List<Item> &items, uint32_t *counter,

                          find_item_error_report_type report_error,

                          enum_resolution_type *resolution);

bool insert_fields(Session *session, Name_resolution_context *context,

                   const char *db_name, const char *table_name,

                   List_iterator<Item> *it, bool any_privileges);

bool setup_tables(Session *session, Name_resolution_context *context,

                  List<TableList> *from_clause, TableList *tables,

                  TableList **leaves, bool select_insert);

bool setup_tables_and_check_access(Session *session,

                                   Name_resolution_context *context,

                                   List<TableList> *from_clause,

                                   TableList *tables,

                                   TableList **leaves,

                                   bool select_insert);

int setup_wild(Session *session, List<Item> &fields,

               List<Item> *sum_func_list,

               uint32_t wild_num);

bool setup_fields(Session *session, Item** ref_pointer_array,

                  List<Item> &item, enum_mark_columns mark_used_columns,

                  List<Item> *sum_func_list, bool allow_sum_func);

inline bool setup_fields_with_no_wrap(Session *session, Item **ref_pointer_array,

                                      List<Item> &item,

                                      enum_mark_columns mark_used_columns,

                                      List<Item> *sum_func_list,

                                      bool allow_sum_func)

{

  bool res;

  res= setup_fields(session, ref_pointer_array, item, mark_used_columns, sum_func_list,

                    allow_sum_func);

  return res;

}

int setup_conds(Session *session, TableList *leaves, COND **conds);

/* open_and_lock_tables with optional derived handling */

TableList *find_table_in_list(TableList *table,

                               TableList *TableList::*link,

                               const char *db_name,

                               const char *table_name);

TableList *unique_table(TableList *table, TableList *table_list,

                        bool check_alias= false);

void remove_db_from_cache(const std::string schema_name);

/* bits for last argument to remove_table_from_cache() */

#define RTFC_NO_FLAG                0x0000

#define RTFC_OWNED_BY_Session_FLAG      0x0001

#define RTFC_WAIT_OTHER_THREAD_FLAG 0x0002

#define RTFC_CHECK_KILLED_FLAG      0x0004

bool remove_table_from_cache(Session *session, const char *db, const char *table,

                             uint32_t flags);

void mem_alloc_error(size_t size);

bool fill_record(Session* session, List<Item> &fields, List<Item> &values, bool ignore_errors= false);

bool fill_record(Session *session, Field **field, List<Item> &values, bool ignore_errors= false);

inline TableList *find_table_in_global_list(TableList *table,

                                             const char *db_name,

                                             const char *table_name)

{

  return find_table_in_list(table, &TableList::next_global,

                            db_name, table_name);

}

} /* namespace drizzled */

#endif /* DRIZZLED_SQL_BASE_H */