mirror of
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148 lines
4.5 KiB
C++
148 lines
4.5 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2014, OpenNebula Project (OpenNebula.org), C12G Labs */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef SYSTEM_DB_H_
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#define SYSTEM_DB_H_
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#include "SqlDB.h"
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#include "Callbackable.h"
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class Nebula;
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/**
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* This class represents the OpenNebula core system data tables:
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* - pool_control
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* - db_versioning
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* - system attributes
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*/
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class SystemDB: public Callbackable
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{
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public:
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/**
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* Reads a System attribute from the DB
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* @param attr_name name of the attribute
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* @param attr_xml the attribute in a XML document
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* @return 0 on success
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*/
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int select_sys_attribute(const string& attr_name, string& attr_zml);
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/**
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* Writes a system attribute in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int insert_sys_attribute(
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const string& attr_name,
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const string& xml_attr,
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string& error_str)
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{
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return insert_replace(attr_name, xml_attr, false, error_str);
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};
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/**
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* Updates the system attribute in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int update_sys_attribute(
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const string& attr_name,
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const string& xml_attr,
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string& error_str)
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{
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return insert_replace(attr_name, xml_attr, true, error_str);
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};
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private:
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friend class Nebula; //Only for Nebula class
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SystemDB(SqlDB *_db):db(_db){};
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~SystemDB(){};
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// Pool control table
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static const char * pc_names;
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static const char * pc_bootstrap;
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static const char * pc_table;
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// DB versioning table
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static const char * ver_names;
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static const char * ver_bootstrap;
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static const char * ver_table;
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// System attributes table
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static const char * sys_names;
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static const char * sys_bootstrap;
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static const char * sys_table;
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// Pointer to the db database
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SqlDB *db;
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/**
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* Execute an INSERT or REPLACE Sql query for a system attribute.
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* @param db The SQL DB
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* @param replace Execute an INSERT or a REPLACE
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* @param error_str Returns the error reason, if any
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* @return 0 one success
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*/
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int insert_replace(const string& attr_name,
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const string& xml_attr,
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bool replace,
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string& error_str);
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/**
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* Bootstraps the database control tables
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*
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* @return 0 on success
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*/
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int bootstrap();
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/**
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* Callback function for the check_db_version method. Stores the read
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* version in loaded_db_version
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* @param _loaded_db_version returned columns
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* @param num the number of columns read from the DB
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* @param names the column names
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* @param vaues the column values
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* @return 0 on success
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*/
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int select_cb(void *_loaded_db_version,
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int num,
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char **values,
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char **names);
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/**
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* Callback function for selecting system attributes
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*/
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int select_attr_cb(void *_attr_xml,
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int num,
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char **values,
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char **names);
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/**
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* Reads the current DB version.
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*
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* @return 0 on success,
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* -1 if there is a version mismatch,
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* -2 if the DB needs a bootstrap
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*/
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int check_db_version();
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};
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#endif //SYSTEM_DB_H
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