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Viewing changes to plugin/info_schema/open_tables.cc

  • Committer: Brian Aker
  • Date: 2009-11-18 23:28:30 UTC
  • mfrom: (1215.2.25 is-split)
  • Revision ID: brian@gaz-20091118232830-v28y7o26squz3c9c
Merge of Padraig

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plugin/info_schema/open_tables.cc
 
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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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 *
 
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 *  Copyright (C) 2009 Sun Microsystems
 
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 *
 
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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; either version 2 of the License, or
 
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 *  (at your option) any later version.
 
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 *
 
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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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 *
 
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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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 */
 
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/**
 
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 * @file 
 
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 *   Open tables I_S table methods.
 
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 */
 
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#include "drizzled/server_includes.h"
 
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#include "drizzled/session.h"
 
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#include "drizzled/show.h"
 
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#include "helper_methods.h"
 
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#include "open_tables.h"
 
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#include <vector>
 
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using namespace drizzled;
 
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using namespace std;
 
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/*
 
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 * Vectors of columns for the open tables I_S table.
 
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 */
 
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static vector<const plugin::ColumnInfo *> *columns= NULL;
 
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/*
 
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 * Methods for the open tables I_S table.
 
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 */
 
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static plugin::InfoSchemaMethods *methods= NULL;
 
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/*
 
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 * open tables I_S table.
 
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 */
 
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static plugin::InfoSchemaTable *open_tabs_table= NULL;
 
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/**
 
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 * Populate the vectors of columns for the I_S table.
 
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 *
 
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 * @return a pointer to a std::vector of Columns.
 
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 */
 
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vector<const plugin::ColumnInfo *> *OpenTablesIS::createColumns()
 
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{
 
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  if (columns == NULL)
 
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  {
 
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    columns= new vector<const plugin::ColumnInfo *>;
 
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  }
 
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  else
 
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  {
 
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    clearColumns(*columns);
 
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  }
 
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  columns->push_back(new plugin::ColumnInfo("Database",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "Database",
 
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                                            SKIP_OPEN_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("Table",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "Table",
 
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                                            SKIP_OPEN_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("In_use",
 
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                                            1,
 
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                                            DRIZZLE_TYPE_LONGLONG,
 
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                                            0,
 
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                                            0,
 
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                                            "In_use",
 
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                                            SKIP_OPEN_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("Name_locked",
 
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                                            4,
 
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                                            DRIZZLE_TYPE_LONGLONG,
 
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                                            0,
 
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                                            0,
 
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                                            "Name_locked",
 
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                                            SKIP_OPEN_TABLE));
 
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  return columns;
 
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}
 
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/**
 
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 * Initialize the I_S table.
 
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 *
 
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 * @return a pointer to an I_S table
 
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 */
 
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plugin::InfoSchemaTable *OpenTablesIS::getTable()
 
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{
 
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  columns= createColumns();
 
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  if (methods == NULL)
 
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  {
 
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    methods= new OpenTablesISMethods();
 
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  }
 
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  if (open_tabs_table == NULL)
 
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  {
 
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    open_tabs_table= new plugin::InfoSchemaTable("OPEN_TABLES",
 
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                                                 *columns,
 
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                                                 -1, -1, true, false, 0,
 
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                                                 methods);
 
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  }
 
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  return open_tabs_table;
 
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}
 
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/**
 
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 * Delete memory allocated for the table, columns and methods.
 
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 */
 
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void OpenTablesIS::cleanup()
 
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{
 
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  clearColumns(*columns);
 
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  delete open_tabs_table;
 
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  delete methods;
 
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  delete columns;
 
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}
 
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inline bool open_list_store(Table *table, open_table_list_st& open_list);
 
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inline bool open_list_store(Table *table, open_table_list_st& open_list)
 
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{
 
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  table->restoreRecordAsDefault();
 
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  table->field[0]->store(open_list.db.c_str(), open_list.db.length(), system_charset_info);
 
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  table->field[1]->store(open_list.table.c_str(), open_list.table.length(), system_charset_info);
 
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  table->field[2]->store((int64_t) open_list.in_use, true);
 
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  table->field[3]->store((int64_t) open_list.locked, true);
 
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  if (schema_table_store_record(table->in_use, table))
 
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    return true;
 
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  return false;
 
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}
 
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int OpenTablesISMethods::fillTable(Session *session, TableList *tables)
 
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{
 
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  const char *wild= session->lex->wild ? session->lex->wild->ptr() : NULL;
 
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  if ((list_open_tables(session->lex->select_lex.db, wild, open_list_store, tables->table) == true) && session->is_fatal_error)
 
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    return 1;
 
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  return 0;
 
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}
 
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