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sqlite_utils.hpp
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sqlite_utils.hpp
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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_SQLITE_UTILS_HPP
#define MAPNIK_SQLITE_UTILS_HPP
// stl
#include <string.h>
// mapnik
#include <mapnik/datasource.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/sql_utils.hpp>
// boost
#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>
// sqlite
extern "C" {
#include <sqlite3.h>
}
#include "sqlite_resultset.hpp"
#include "sqlite_prepared.hpp"
#include "sqlite_connection.hpp"
//==============================================================================
class sqlite_utils
{
public:
static void dequote(std::string & z)
{
boost::algorithm::trim_if(z,boost::algorithm::is_any_of("[]'\"`"));
}
static std::string index_for_table(std::string const& table, std::string const& field)
{
return "\"idx_" + mapnik::sql_utils::unquote(table) + "_" + field + "\"";
}
static std::string index_for_db(std::string const& file)
{
//std::size_t idx = file.find_last_of(".");
//if(idx != std::string::npos) {
// return file.substr(0,idx) + ".index" + file.substr(idx);
//}
//else
//{
return file + ".index";
//}
}
static void query_extent(boost::shared_ptr<sqlite_resultset> rs,
mapnik::box2d<double>& extent)
{
bool first = true;
while (rs->is_valid() && rs->step_next())
{
int size;
const char* data = (const char*) rs->column_blob(0, size);
if (data)
{
boost::ptr_vector<mapnik::geometry_type> paths;
mapnik::geometry_utils::from_wkb(paths, data, size, false, mapnik::wkbAuto);
for (unsigned i=0; i<paths.size(); ++i)
{
mapnik::box2d<double> const& bbox = paths[i].envelope();
if (bbox.valid())
{
if (first)
{
first = false;
extent = bbox;
}
else
{
extent.expand_to_include(bbox);
}
}
}
}
}
}
static void create_rtree(std::string const& index_db,
std::string const& index_table,
boost::shared_ptr<sqlite_resultset> rs)
{
/* TODO
- speedups
- return early/recover from failure
- allow either in db or in separate
*/
if (!rs->is_valid())
return;
#if SQLITE_VERSION_NUMBER >= 3005000
int flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX;
#else
int flags;
#endif
boost::shared_ptr<sqlite_connection> ds = boost::make_shared<sqlite_connection>(index_db,flags);
// first drop the index if it already exists
std::ostringstream spatial_index_drop_sql;
spatial_index_drop_sql << "DROP TABLE IF EXISTS " << index_table;
ds->execute(spatial_index_drop_sql.str());
ds->execute("PRAGMA synchronous=OFF");
ds->execute("BEGIN TRANSACTION");
// create the spatial index
std::ostringstream create_idx;
create_idx << "create virtual table "
<< index_table
<< " using rtree(pkid, xmin, xmax, ymin, ymax)";
// insert for prepared statement
std::ostringstream insert_idx;
insert_idx << "insert into "
<< index_table
<< " values (?,?,?,?,?)";
ds->execute(create_idx.str());
prepared_index_statement ps(ds,insert_idx.str());
while (rs->is_valid() && rs->step_next())
{
int size;
const char* data = (const char*) rs->column_blob(0, size);
if (data)
{
boost::ptr_vector<mapnik::geometry_type> paths;
// TODO - contraint fails if multiple_geometries = true
bool multiple_geometries = false;
mapnik::geometry_utils::from_wkb(paths, data, size, multiple_geometries, mapnik::wkbAuto);
for (unsigned i=0; i<paths.size(); ++i)
{
mapnik::box2d<double> const& bbox = paths[i].envelope();
if (bbox.valid())
{
ps.bind(bbox);
const int type_oid = rs->column_type(1);
if (type_oid != SQLITE_INTEGER)
{
std::ostringstream error_msg;
error_msg << "Sqlite Plugin: invalid type for key field '"
<< rs->column_name(1) << "' when creating index '" << index_table
<< "' type was: " << type_oid << "";
throw mapnik::datasource_exception(error_msg.str());
}
const sqlite_int64 pkid = rs->column_integer64(1);
ps.bind(pkid);
}
else
{
std::ostringstream error_msg;
error_msg << "SQLite Plugin: encountered invalid bbox at '"
<< rs->column_name(1) << "' == " << rs->column_integer64(1);
throw mapnik::datasource_exception(error_msg.str());
}
ps.step_next();
}
}
}
ds->execute("COMMIT");
}
static bool detect_extent(boost::shared_ptr<sqlite_connection> ds,
bool has_spatial_index,
mapnik::box2d<double> & extent,
std::string const& index_table,
std::string const& metadata,
std::string const& geometry_field,
std::string const& geometry_table,
std::string const& key_field,
std::string const& table
)
{
if (has_spatial_index)
{
std::ostringstream s;
s << "SELECT MIN(xmin), MIN(ymin), MAX(xmax), MAX(ymax) FROM "
<< index_table;
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
if (rs->is_valid() && rs->step_next())
{
if (! rs->column_isnull(0))
{
try
{
double xmin = boost::lexical_cast<double>(rs->column_double(0));
double ymin = boost::lexical_cast<double>(rs->column_double(1));
double xmax = boost::lexical_cast<double>(rs->column_double(2));
double ymax = boost::lexical_cast<double>(rs->column_double(3));
extent.init(xmin, ymin, xmax, ymax);
return true;
}
catch (boost::bad_lexical_cast& ex)
{
std::ostringstream ss;
ss << "SQLite Plugin: warning: could not determine extent from query: "
<< "'" << s.str() << "' \n problem was: " << ex.what() << std::endl;
std::clog << ss.str();
}
}
}
}
else if (! metadata.empty())
{
std::ostringstream s;
s << "SELECT xmin, ymin, xmax, ymax FROM " << metadata;
s << " WHERE LOWER(f_table_name) = LOWER('" << geometry_table << "')";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
if (rs->is_valid() && rs->step_next())
{
double xmin = rs->column_double (0);
double ymin = rs->column_double (1);
double xmax = rs->column_double (2);
double ymax = rs->column_double (3);
extent.init (xmin, ymin, xmax, ymax);
return true;
}
}
else if (! key_field.empty())
{
std::ostringstream s;
s << "SELECT " << geometry_field << "," << key_field
<< " FROM (" << table << ")";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
sqlite_utils::query_extent(rs,extent);
return true;
}
return false;
}
static bool has_rtree(std::string const& index_table,boost::shared_ptr<sqlite_connection> ds)
{
try
{
std::ostringstream s;
s << "SELECT pkid,xmin,xmax,ymin,ymax FROM " << index_table << " LIMIT 1";
boost::shared_ptr<sqlite_resultset> rs = ds->execute_query(s.str());
if (rs->is_valid() && rs->step_next())
{
return true;
}
}
catch (...)
{
return false;
}
return false;
}
static bool detect_types_from_subquery(std::string const& query,
std::string & geometry_field,
mapnik::layer_descriptor & desc,
boost::shared_ptr<sqlite_connection> ds)
{
bool found = false;
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(query));
if (rs->is_valid() && rs->step_next())
{
for (int i = 0; i < rs->column_count(); ++i)
{
found = true;
const int type_oid = rs->column_type(i);
const char* fld_name = rs->column_name(i);
switch (type_oid)
{
case SQLITE_INTEGER:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Integer));
break;
case SQLITE_FLOAT:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Double));
break;
case SQLITE_TEXT:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
break;
case SQLITE_NULL:
// sqlite reports based on value, not actual column type unless
// PRAGMA table_info is used so here we assume the column is a string
// which is a lesser evil than altogether dropping the column
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
case SQLITE_BLOB:
if (geometry_field.empty()
&& (boost::algorithm::icontains(fld_name, "geom") ||
boost::algorithm::icontains(fld_name, "point") ||
boost::algorithm::icontains(fld_name, "linestring") ||
boost::algorithm::icontains(fld_name, "polygon")))
{
geometry_field = std::string(fld_name);
}
break;
default:
#ifdef MAPNIK_DEBUG
std::clog << "Sqlite Plugin: unknown type_oid=" << type_oid << std::endl;
#endif
break;
}
}
}
return found;
}
static bool table_info(std::string & key_field,
bool detected_types,
std::string & field,
std::string & table,
mapnik::layer_descriptor & desc,
boost::shared_ptr<sqlite_connection> ds)
{
// http://www.sqlite.org/pragma.html#pragma_table_info
// use pragma table_info to detect primary key
// and to detect types if no subquery is used or
// if the subquery-based type detection failed
std::ostringstream s;
s << "PRAGMA table_info(" << table << ")";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
bool found_table = false;
bool found_pk = false;
while (rs->is_valid() && rs->step_next())
{
found_table = true;
const char* fld_name = rs->column_text(1);
std::string fld_type(rs->column_text(2));
int fld_pk = rs->column_integer(5);
boost::algorithm::to_lower(fld_type);
// TODO - how to handle primary keys on multiple columns ?
if (key_field.empty() && ! found_pk && fld_pk != 0)
{
key_field = fld_name;
found_pk = true;
}
if (! detected_types)
{
// see 2.1 "Column Affinity" at http://www.sqlite.org/datatype3.html
// TODO - refactor this somehow ?
if (field.empty()
&& ((boost::algorithm::contains(fld_type, "geom") ||
boost::algorithm::contains(fld_type, "point") ||
boost::algorithm::contains(fld_type, "linestring") ||
boost::algorithm::contains(fld_type, "polygon"))
||
(boost::algorithm::icontains(fld_name, "geom") ||
boost::algorithm::icontains(fld_name, "point") ||
boost::algorithm::icontains(fld_name, "linestring") ||
boost::algorithm::icontains(fld_name, "polygon")))
)
{
field = std::string(fld_name);
}
else if (boost::algorithm::contains(fld_type, "int"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Integer));
}
else if (boost::algorithm::contains(fld_type, "text") ||
boost::algorithm::contains(fld_type, "char") ||
boost::algorithm::contains(fld_type, "clob"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
}
else if (boost::algorithm::contains(fld_type, "real") ||
boost::algorithm::contains(fld_type, "float") ||
boost::algorithm::contains(fld_type, "double"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Double));
}
else if (boost::algorithm::contains(fld_type, "blob"))
{
if (! field.empty())
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
}
}
#ifdef MAPNIK_DEBUG
else
{
// "Column Affinity" says default to "Numeric" but for now we pass..
//desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
// TODO - this should not fail when we specify geometry_field in XML file
std::clog << "Sqlite Plugin: column '"
<< std::string(fld_name)
<< "' unhandled due to unknown type: "
<< fld_type << std::endl;
}
#endif
}
}
return found_table;
}
};
#endif // MAPNIK_SQLITE_UTILS_HPP