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mapnik/plugins/input/sqlite/sqlite_datasource.cpp
Artem Pavlenko 7209988fb0 Simplify geometry model to support: Point/LineString/Polygon 
Multi geometries are collections of single geometries
Remove multiple_geometries parameter
2011-12-06 12:53:16 +00:00

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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
*
*****************************************************************************/
#include "sqlite_datasource.hpp"
#include "sqlite_featureset.hpp"
#include "sqlite_resultset.hpp"
#include "sqlite_utils.hpp"
// mapnik
#include <mapnik/ptree_helpers.hpp>
#include <mapnik/sql_utils.hpp>
// boost
#include <boost/algorithm/string.hpp>
#include <boost/tokenizer.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/make_shared.hpp>
#include <boost/scoped_array.hpp>
using mapnik::box2d;
using mapnik::coord2d;
using mapnik::query;
using mapnik::featureset_ptr;
using mapnik::layer_descriptor;
using mapnik::attribute_descriptor;
using mapnik::datasource_exception;
using mapnik::datasource;
using mapnik::parameters;
DATASOURCE_PLUGIN(sqlite_datasource)
sqlite_datasource::sqlite_datasource(parameters const& params, bool bind)
: datasource(params),
extent_(),
extent_initialized_(false),
type_(datasource::Vector),
table_(*params_.get<std::string>("table", "")),
fields_(*params_.get<std::string>("fields", "*")),
metadata_(*params_.get<std::string>("metadata", "")),
geometry_table_(*params_.get<std::string>("geometry_table", "")),
geometry_field_(*params_.get<std::string>("geometry_field", "")),
index_table_(*params_.get<std::string>("index_table", "")),
key_field_(*params_.get<std::string>("key_field", "")),
row_offset_(*params_.get<int>("row_offset", 0)),
row_limit_(*params_.get<int>("row_limit", 0)),
desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding", "utf-8")),
format_(mapnik::wkbAuto)
{
/* TODO
- throw if no primary key but spatial index is present?
- remove auto-indexing
*/
boost::optional<std::string> file = params_.get<std::string>("file");
if (! file) throw datasource_exception("Sqlite Plugin: missing <file> parameter");
if (table_.empty())
{
throw mapnik::datasource_exception("Sqlite Plugin: missing <table> parameter");
}
if (bind)
{
this->bind();
}
}
void sqlite_datasource::bind() const
{
if (is_bound_) return;
boost::optional<std::string> file = params_.get<std::string>("file");
if (! file) throw datasource_exception("Sqlite Plugin: missing <file> parameter");
boost::optional<std::string> base = params_.get<std::string>("base");
if (base)
dataset_name_ = *base + "/" + *file;
else
dataset_name_ = *file;
if ((dataset_name_.compare(":memory:") != 0) && (!boost::filesystem::exists(dataset_name_)))
{
throw datasource_exception("Sqlite Plugin: " + dataset_name_ + " does not exist");
}
use_spatial_index_ = *params_.get<mapnik::boolean>("use_spatial_index", true);
// TODO - remove this option once all datasources have an indexing api
bool auto_index = *params_.get<mapnik::boolean>("auto_index", true);
boost::optional<std::string> ext = params_.get<std::string>("extent");
if (ext) extent_initialized_ = extent_.from_string(*ext);
boost::optional<std::string> wkb = params_.get<std::string>("wkb_format");
if (wkb)
{
if (*wkb == "spatialite")
{
format_ = mapnik::wkbSpatiaLite;
}
else if (*wkb == "generic")
{
format_ = mapnik::wkbGeneric;
}
else
{
format_ = mapnik::wkbAuto;
}
}
// Populate init_statements_
// 1. Build attach database statements from the "attachdb" parameter
// 2. Add explicit init statements from "initdb" parameter
// Note that we do some extra work to make sure that any attached
// databases are relative to directory containing dataset_name_. Sqlite
// will default to attaching from cwd. Typicaly usage means that the
// map loader will produce full paths here.
boost::optional<std::string> attachdb = params_.get<std::string>("attachdb");
if (attachdb)
{
parse_attachdb(*attachdb);
}
boost::optional<std::string> initdb = params_.get<std::string>("initdb");
if (initdb)
{
init_statements_.push_back(*initdb);
}
if (geometry_table_.empty())
{
geometry_table_ = mapnik::sql_utils::table_from_sql(table_);
}
// if 'table_' is a subquery then we try to deduce names
// and types from the first row returned from that query
using_subquery_ = false;
if (table_ != geometry_table_)
{
using_subquery_ = true;
}
else
{
// attempt to auto-quote table if needed
if (sqlite_utils::needs_quoting(table_))
{
table_ = std::string("[") + table_ + "]";
geometry_table_ = table_;
}
}
// now actually create the connection and start executing setup sql
dataset_ = boost::make_shared<sqlite_connection>(dataset_name_);
// Execute init_statements_
for (std::vector<std::string>::const_iterator iter = init_statements_.begin();
iter != init_statements_.end(); ++iter)
{
#ifdef MAPNIK_DEBUG
std::clog << "Sqlite Plugin: Execute init sql: " << *iter << std::endl;
#endif
dataset_->execute(*iter);
}
bool found_types_via_subquery = false;
if (using_subquery_)
{
std::ostringstream s;
s << "SELECT " << fields_ << " FROM (" << table_ << ") LIMIT 1";
found_types_via_subquery = sqlite_utils::detect_types_from_subquery(s.str(),geometry_field_,desc_,dataset_);
}
// TODO - consider removing this
if (key_field_ == "rowid")
{
desc_.add_descriptor(attribute_descriptor("rowid", mapnik::Integer));
}
bool found_table = sqlite_utils::table_info(key_field_,
found_types_via_subquery,
geometry_field_,
geometry_table_,
desc_,
dataset_);
if (! found_table)
{
std::ostringstream s;
s << "Sqlite Plugin: could not query table '" << geometry_table_ << "'";
if (using_subquery_)
{
s << " from subquery '" << table_ << "'";
}
// report get available tables
std::vector<std::string> tables;
sqlite_utils::get_tables(dataset_,tables);
if (tables.size() > 0)
{
s << " (available tables for " << dataset_name_ << " are: '" << boost::algorithm::join(tables, ", ") << "')";
}
throw datasource_exception(s.str());
}
if (geometry_field_.empty())
{
throw datasource_exception("Sqlite Plugin: cannot detect geometry_field, please supply the name of the geometry_field to use.");
}
if (index_table_.empty())
{
// Generate implicit index_table name - need to do this after
// we have discovered meta-data or else we don't know the column name
index_table_ = sqlite_utils::index_for_table(geometry_table_,geometry_field_);
}
std::string index_db = sqlite_utils::index_for_db(dataset_name_);
has_spatial_index_ = false;
if (use_spatial_index_)
{
if (boost::filesystem::exists(index_db))
{
dataset_->execute("attach database '" + index_db + "' as " + index_table_);
}
has_spatial_index_ = sqlite_utils::has_rtree(index_table_,dataset_);
if (!has_spatial_index_ && auto_index)
{
if (! key_field_.empty())
{
std::ostringstream query;
query << "SELECT "
<< geometry_field_
<< "," << key_field_
<< " FROM ("
<< geometry_table_ << ")";
/*
std::vector<sqlite_utils::rtree_type> rtree_list;
{
boost::shared_ptr<sqlite_resultset> rs = dataset_->execute_query(query.str());
sqlite_utils::build_tree(rs,rtree_list);
}
if (sqlite_utils::create_spatial_index2(index_db,index_table_,rtree_list))
{
//extent_initialized_ = true;
has_spatial_index_ = true;
if (boost::filesystem::exists(index_db))
{
dataset_->execute("attach database '" + index_db + "' as " + index_table_);
}
}
*/
boost::shared_ptr<sqlite_resultset> rs = dataset_->execute_query(query.str());
if (sqlite_utils::create_spatial_index(index_db,index_table_,rs))
{
//extent_initialized_ = true;
has_spatial_index_ = true;
if (boost::filesystem::exists(index_db))
{
dataset_->execute("attach database '" + index_db + "' as " + index_table_);
}
}
}
else
{
std::ostringstream s;
s << "Sqlite Plugin: key_field is empty for "
<< geometry_field_
<< " and "
<< geometry_table_;
throw datasource_exception(s.str());
}
}
}
if (! extent_initialized_)
{
// TODO - clean this up - reducing arguments
if (!sqlite_utils::detect_extent(dataset_,
has_spatial_index_,
extent_,
index_table_,
metadata_,
geometry_field_,
geometry_table_,
key_field_,
table_))
{
std::ostringstream s;
s << "Sqlite Plugin: extent could not be determined for table '"
<< geometry_table_ << "' and geometry field '" << geometry_field_ << "'"
<< " because an rtree spatial index is missing or empty."
<< " - either set the table 'extent' or create an rtree spatial index";
throw datasource_exception(s.str());
}
}
is_bound_ = true;
}
sqlite_datasource::~sqlite_datasource()
{
}
#if (BOOST_FILESYSTEM_VERSION <= 2)
namespace boost {
namespace filesystem {
path read_symlink(const path& p)
{
path symlink_path;
#ifdef BOOST_POSIX_API
for (std::size_t path_max = 64;; path_max *= 2)// loop 'til buffer is large enough
{
boost::scoped_array<char> buf(new char[path_max]);
ssize_t result;
if ((result=::readlink(p.string().c_str(), buf.get(), path_max))== -1)
{
throw std::runtime_error("could not read symlink");
}
else
{
if(result != static_cast<ssize_t>(path_max))
{
symlink_path.assign(buf.get(), buf.get() + result);
break;
}
}
}
#endif
return symlink_path;
}
}
}
#endif
void sqlite_datasource::parse_attachdb(std::string const& attachdb) const
{
boost::char_separator<char> sep(",");
boost::tokenizer<boost::char_separator<char> > tok(attachdb, sep);
// The attachdb line is a comma sparated list of [dbname@]filename
for (boost::tokenizer<boost::char_separator<char> >::iterator beg = tok.begin();
beg != tok.end(); ++beg)
{
std::string const& spec(*beg);
size_t atpos = spec.find('@');
// See if it contains an @ sign
if (atpos == spec.npos)
{
throw datasource_exception("attachdb parameter has syntax dbname@filename[,...]");
}
// Break out the dbname and the filename
std::string dbname = boost::trim_copy(spec.substr(0, atpos));
std::string filename = boost::trim_copy(spec.substr(atpos + 1));
// Normalize the filename and make it relative to dataset_name_
if (filename.compare(":memory:") != 0)
{
boost::filesystem::path child_path(filename);
// It is a relative path. Fix it.
if (! child_path.has_root_directory() && ! child_path.has_root_name())
{
boost::filesystem::path absolute_path(dataset_name_);
// support symlinks
if (boost::filesystem::is_symlink(absolute_path))
{
absolute_path = boost::filesystem::read_symlink(absolute_path);
}
#if (BOOST_FILESYSTEM_VERSION == 3)
filename = boost::filesystem::absolute(absolute_path.parent_path() / filename).string();
#else
filename = boost::filesystem::complete(absolute_path.branch_path() / filename).normalize().string();
#endif
}
}
// And add an init_statement_
init_statements_.push_back("attach database '" + filename + "' as " + dbname);
}
}
std::string sqlite_datasource::name()
{
return "sqlite";
}
int sqlite_datasource::type() const
{
return type_;
}
box2d<double> sqlite_datasource::envelope() const
{
if (! is_bound_) bind();
return extent_;
}
layer_descriptor sqlite_datasource::get_descriptor() const
{
if (! is_bound_) bind();
return desc_;
}
featureset_ptr sqlite_datasource::features(query const& q) const
{
if (! is_bound_) bind();
if (dataset_)
{
mapnik::box2d<double> const& e = q.get_bbox();
std::ostringstream s;
s << "SELECT " << geometry_field_;
if (!key_field_.empty())
s << "," << key_field_;
std::set<std::string> const& props = q.property_names();
std::set<std::string>::const_iterator pos = props.begin();
std::set<std::string>::const_iterator end = props.end();
while (pos != end)
{
// TODO - should we restrict duplicate key query?
//if (*pos != key_field_)
s << ",[" << *pos << "]";
++pos;
}
s << " FROM ";
std::string query (table_);
if (! key_field_.empty() && has_spatial_index_)
{
std::ostringstream spatial_sql;
spatial_sql << std::setprecision(16);
spatial_sql << " WHERE " << key_field_ << " IN (SELECT pkid FROM " << index_table_;
spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
if (boost::algorithm::ifind_first(query, "WHERE"))
{
boost::algorithm::ireplace_first(query, "WHERE", spatial_sql.str() + " AND ");
}
else if (boost::algorithm::ifind_first(query, geometry_table_))
{
boost::algorithm::ireplace_first(query, table_, table_ + " " + spatial_sql.str());
}
}
s << query ;
if (row_limit_ > 0)
{
s << " LIMIT " << row_limit_;
}
if (row_offset_ > 0)
{
s << " OFFSET " << row_offset_;
}
#ifdef MAPNIK_DEBUG
std::clog << "Sqlite Plugin: table: " << table_ << "\n\n";
std::clog << "Sqlite Plugin: query: " << s.str() << "\n\n";
#endif
boost::shared_ptr<sqlite_resultset> rs(dataset_->execute_query(s.str()));
return boost::make_shared<sqlite_featureset>(rs,
desc_.get_encoding(),
format_,
using_subquery_);
}
return featureset_ptr();
}
featureset_ptr sqlite_datasource::features_at_point(coord2d const& pt) const
{
if (! is_bound_) bind();
if (dataset_)
{
// TODO - need tolerance
mapnik::box2d<double> const e(pt.x, pt.y, pt.x, pt.y);
std::ostringstream s;
s << "SELECT " << geometry_field_;
if (!key_field_.empty())
s << "," << key_field_;
std::vector<attribute_descriptor>::const_iterator itr = desc_.get_descriptors().begin();
std::vector<attribute_descriptor>::const_iterator end = desc_.get_descriptors().end();
while (itr != end)
{
std::string fld_name = itr->get_name();
if (fld_name != key_field_)
{
s << ",[" << itr->get_name() << "]";
}
++itr;
}
s << " FROM ";
std::string query(table_);
if (! key_field_.empty() && has_spatial_index_)
{
std::ostringstream spatial_sql;
spatial_sql << std::setprecision(16);
spatial_sql << " WHERE " << key_field_ << " IN (SELECT pkid FROM " << index_table_;
spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
if (boost::algorithm::ifind_first(query, "WHERE"))
{
boost::algorithm::ireplace_first(query, "WHERE", spatial_sql.str() + " AND ");
}
else if (boost::algorithm::ifind_first(query, geometry_table_))
{
boost::algorithm::ireplace_first(query, table_, table_ + " " + spatial_sql.str());
}
}
s << query ;
if (row_limit_ > 0)
{
s << " LIMIT " << row_limit_;
}
if (row_offset_ > 0)
{
s << " OFFSET " << row_offset_;
}
#ifdef MAPNIK_DEBUG
std::clog << "Sqlite Plugin: " << s.str() << std::endl;
#endif
boost::shared_ptr<sqlite_resultset> rs(dataset_->execute_query(s.str()));
return boost::make_shared<sqlite_featureset>(rs,
desc_.get_encoding(),
format_,
using_subquery_);
}
return featureset_ptr();
}
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