/usr/include/dballe/db/v6/qbuilder.h is in libdballe-dev 6.8-1.
This file is owned by root:root, with mode 0o644.
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* db/v6/qbuilder - build SQL queries for V6 databases
*
* Copyright (C) 2005--2013 ARPA-SIM <urpsim@smr.arpa.emr.it>
*
* 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; either 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
*
* Author: Enrico Zini <enrico@enricozini.com>
*/
/** @file
* @ingroup db
*
* Functions used to manage a general DB-ALLe query
*/
#ifndef DBA_DB_V6_QBUILDER_H
#define DBA_DB_V6_QBUILDER_H
#include "dballe/db/querybuf.h"
#include "dballe/db/internals.h"
#include "dballe/db/db.h"
#include "dballe/core/record.h"
#include "db.h"
#include "cursor.h"
#include <regex.h>
#if 0
/**
* Constants used to define what is needed from the FROM part of the query
*/
/** Add pseudoana to the FROM part of the query */
#define DBA_DB_FROM_PA (1 << 0)
/** Add lev_tr to the FROM part of the query */
#define DBA_DB_FROM_LTR (1 << 1)
/** Add data to the FROM part of the query */
#define DBA_DB_FROM_D (1 << 2)
/** Add repinfo to the FROM part of the query */
#define DBA_DB_FROM_RI (1 << 3)
/** Add the the block variables as 'dblo' to the FROM part of the query */
#define DBA_DB_FROM_DBLO (1 << 5)
/** Add the the station variables as 'dsta' to the FROM part of the query */
#define DBA_DB_FROM_DSTA (1 << 6)
/** Add the the pseudoana variables as 'dana' to the FROM part of the query */
#define DBA_DB_FROM_DANA (1 << 7)
/** Add an extra data table as 'ddf' to the FROM part of the query, to restrict
* the query on variable values */
#define DBA_DB_FROM_DDF (1 << 8)
/** Add an extra attr table as 'adf' to the FROM part of the query, to restrict
* the query on variable attributes */
#define DBA_DB_FROM_ADF (1 << 9)
#endif
namespace dballe {
namespace db {
namespace v6 {
/**
* Copies of bind values that cannot be bound to data inside the query
* Record
*/
struct ExtraQueryArgs
{
/// Minimum datetime
SQL_TIMESTAMP_STRUCT sel_dtmin;
/// Maximum datetime
SQL_TIMESTAMP_STRUCT sel_dtmax;
/// Positional sequence number to use to bind ODBC input parameters
unsigned int input_seq;
ExtraQueryArgs() : input_seq(1) {};
};
struct QueryBuilder
{
/** Database to operate on */
DB& db;
/** Statement to build variables to */
Statement& stm;
/** Cursor with the output variables */
Cursor& cur;
/// Record with the query
const Record& rec;
/** Dynamically generated SQL query */
Querybuf sql_query;
/// FROM part of the SQL query
Querybuf sql_from;
/// WHERE part of the SQL query
Querybuf sql_where;
/// Modifier flags to enable special query behaviours
const unsigned int modifiers;
ExtraQueryArgs qargs;
/// Sequence number to use to bind ODBC output parameters
unsigned int output_seq;
/// True if we are querying station information, rather than measured data
bool query_station_vars;
#if 0
/** What values are wanted from the query */
unsigned int wanted;
/** What is needed from the SELECT part of the query */
unsigned int select_wanted;
/** What is needed from the FROM part of the query */
unsigned int from_wanted;
/// true if we have already appended the "ORDER BY" clause to the query
bool has_orderby;
#endif
QueryBuilder(DB& db, Statement& stm, Cursor& cur, const Record& rec, unsigned int modifiers);
virtual ~QueryBuilder() {}
void build();
protected:
// Add WHERE conditions
bool add_pa_where(const char* tbl);
bool add_dt_where(const char* tbl);
bool add_ltr_where(const char* tbl);
bool add_varcode_where(const char* tbl);
bool add_repinfo_where(const char* tbl);
bool add_datafilter_where(const char* tbl);
bool add_attrfilter_where(const char* tbl);
virtual void build_select() = 0;
virtual bool build_where() = 0;
virtual void build_order_by() = 0;
#if 0
/**
* Add one or more fields to the ORDER BY part of sql_query.
*/
void add_to_orderby(const char* fields);
/**
* Add extra JOIN clauses to sql_query according to what is wanted.
*
* @param base
* The first table mentioned in the query, to which the other tables are
* joined
*/
void add_other_froms(unsigned int base, const Record& rec);
/// Resolve table/field dependencies adding the missing bits to from_wanted
void resolve_dependencies();
/// Prepare SELECT Part and see what needs to be available in the FROM part
void make_select();
/**
* Prepare the extra bits of the SELECT part that need information after
* dependency computation
*/
void make_extra_select();
/// Build the FROM and WHERE parts of the query
void make_from(const Record& rec);
/// Add an int field to the WHERE part of the query, binding it as an input parameter
void add_int(const Record& rec, dba_keyword key, const char* sql, int needed_from);
/// Build the WHERE part of the query, and bind the input parameters
void make_where(const Record& rec);
/// Add repinfo-related WHERE clauses on column \a colname to \a buf from \a query
void add_repinfo_where(Querybuf& buf, const Record& query, const char* colname);
/// Build the big data query
void build_query(const Record& rec);
/// Build the query with just SELECT COUNT(*)
void build_count_query(const Record& rec);
/// Build the query with just a select for date extremes
void build_date_extremes_query(const Record& rec);
#endif
};
struct StationQueryBuilder : public QueryBuilder
{
StationQueryBuilder(DB& db, Statement& stm, Cursor& cur, const Record& rec, unsigned int modifiers)
: QueryBuilder(db, stm, cur, rec, modifiers) {}
virtual void build_select();
virtual bool build_where();
virtual void build_order_by();
};
struct DataQueryBuilder : public QueryBuilder
{
int query_data_id;
DataQueryBuilder(DB& db, Statement& stm, Cursor& cur, const Record& rec, unsigned int modifiers);
virtual void build_select();
virtual bool build_where();
virtual void build_order_by();
};
struct IdQueryBuilder : public DataQueryBuilder
{
IdQueryBuilder(DB& db, Statement& stm, Cursor& cur, const Record& rec, unsigned int modifiers)
: DataQueryBuilder(db, stm, cur, rec, modifiers) {}
virtual void build_select();
virtual void build_order_by();
};
struct SummaryQueryBuilder : public DataQueryBuilder
{
CursorSummary& cur_s;
SummaryQueryBuilder(DB& db, Statement& stm, CursorSummary& cur, const Record& rec, unsigned int modifiers)
: DataQueryBuilder(db, stm, cur, rec, modifiers), cur_s(cur) {}
virtual void build_select();
virtual void build_order_by();
};
}
}
}
#endif
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