816 lines
30 KiB
C++
816 lines
30 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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#include "connection_manager.hpp"
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#include "postgis_datasource.hpp"
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#include "postgis_featureset.hpp"
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// mapnik
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#include <mapnik/global.hpp>
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#include <mapnik/ptree_helpers.hpp>
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#include <mapnik/sql_utils.hpp>
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#include <mapnik/util/conversions.hpp>
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/tokenizer.hpp>
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#include <boost/format.hpp>
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#include <boost/make_shared.hpp>
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// stl
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#include <string>
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#include <algorithm>
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#include <set>
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#include <sstream>
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#include <iomanip>
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#define FMAX std::numeric_limits<double>::max()
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DATASOURCE_PLUGIN(postgis_datasource)
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const std::string postgis_datasource::GEOMETRY_COLUMNS="geometry_columns";
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const std::string postgis_datasource::SPATIAL_REF_SYS="spatial_ref_system";
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using boost::shared_ptr;
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using mapnik::PoolGuard;
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using mapnik::attribute_descriptor;
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postgis_datasource::postgis_datasource(parameters const& params)
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: datasource(params),
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table_(*params.get<std::string>("table","")),
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schema_(""),
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geometry_table_(*params.get<std::string>("geometry_table","")),
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geometry_field_(*params.get<std::string>("geometry_field","")),
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key_field_(*params.get<std::string>("key_field","")),
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cursor_fetch_size_(*params.get<int>("cursor_size",0)),
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row_limit_(*params.get<int>("row_limit",0)),
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type_(datasource::Vector),
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srid_(*params.get<int>("srid",0)),
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extent_initialized_(false),
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desc_(*params.get<std::string>("type"),"utf-8"),
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creator_(params.get<std::string>("host"),
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params.get<std::string>("port"),
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params.get<std::string>("dbname"),
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params.get<std::string>("user"),
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params.get<std::string>("password"),
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params.get<std::string>("connect_timeout","4")),
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bbox_token_("!bbox!"),
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scale_denom_token_("!scale_denominator!"),
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persist_connection_(*params.get<mapnik::boolean>("persist_connection",true)),
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extent_from_subquery_(*params.get<mapnik::boolean>("extent_from_subquery",false)),
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estimate_extent_(*params.get<mapnik::boolean>("estimate_extent",false)),
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// params below are for testing purposes only (will likely be removed at any time)
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intersect_min_scale_(*params.get<int>("intersect_min_scale",0)),
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intersect_max_scale_(*params.get<int>("intersect_max_scale",0))
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//show_queries_(*params.get<mapnik::boolean>("show_queries",false))
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{
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if (table_.empty()) throw mapnik::datasource_exception("Postgis Plugin: missing <table> parameter");
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boost::optional<std::string> ext = params.get<std::string>("extent");
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if (ext) extent_initialized_ = extent_.from_string(*ext);
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this->init(params);
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}
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void postgis_datasource::init(parameters const& params)
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{
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boost::optional<int> initial_size = params.get<int>("initial_size",1);
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boost::optional<int> max_size = params.get<int>("max_size",10);
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ConnectionManager *mgr=ConnectionManager::instance();
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mgr->registerPool(creator_, *initial_size, *max_size);
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std::string g_type;
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shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
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if (pool)
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{
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shared_ptr<Connection> conn = pool->borrowObject();
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if (conn && conn->isOK())
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{
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PoolGuard<shared_ptr<Connection>,
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shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
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desc_.set_encoding(conn->client_encoding());
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if(geometry_table_.empty())
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{
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geometry_table_ = mapnik::sql_utils::table_from_sql(table_);
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}
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std::string::size_type idx = geometry_table_.find_last_of('.');
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if (idx!=std::string::npos)
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{
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schema_ = geometry_table_.substr(0,idx);
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geometry_table_ = geometry_table_.substr(idx+1);
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}
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else
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{
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geometry_table_ = geometry_table_.substr(0);
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}
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// If we do not know both the geometry_field and the srid
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// then first attempt to fetch the geometry name from a geometry_columns entry.
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// This will return no records if we are querying a bogus table returned
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// from the simplistic table parsing in table_from_sql() or if
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// the table parameter references a table, view, or subselect not
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// registered in the geometry columns.
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geometryColumn_ = geometry_field_;
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if (!geometryColumn_.length() > 0 || srid_ == 0)
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{
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std::ostringstream s;
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s << "SELECT f_geometry_column, srid FROM "
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<< GEOMETRY_COLUMNS <<" WHERE f_table_name='"
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<< mapnik::sql_utils::unquote_double(geometry_table_)
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<< "'";
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if (schema_.length() > 0)
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s << " AND f_table_schema='"
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<< mapnik::sql_utils::unquote_double(schema_)
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<< "'";
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if (geometry_field_.length() > 0)
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s << " AND f_geometry_column='"
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<< mapnik::sql_utils::unquote_double(geometry_field_)
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<< "'";
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}
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*/
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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if (rs->next())
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{
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geometryColumn_ = rs->getValue("f_geometry_column");
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if (srid_ == 0)
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{
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const char * srid_c = rs->getValue("srid");
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if (srid_c != NULL)
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{
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int result;
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if (mapnik::conversions::string2int(srid_c,result))
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srid_ = result;
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}
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}
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}
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rs->close();
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// If we still do not know the srid then we can try to fetch
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// it from the 'table_' parameter, which should work even if it is
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// a subselect as long as we know the geometry_field to query
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if (geometryColumn_.length() && srid_ <= 0)
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{
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s.str("");
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s << "SELECT ST_SRID(\"" << geometryColumn_ << "\") AS srid FROM ";
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s << populate_tokens(table_) << " WHERE \"" << geometryColumn_ << "\" IS NOT NULL LIMIT 1;";
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}
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*/
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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if (rs->next())
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{
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const char * srid_c = rs->getValue("srid");
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if (srid_c != NULL)
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{
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int result;
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if (mapnik::conversions::string2int(srid_c,result))
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srid_ = result;
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}
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}
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rs->close();
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}
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}
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if (srid_ == 0)
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{
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srid_ = -1;
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std::clog << "Postgis Plugin: SRID warning, using srid=-1 for '" << table_ << "'" << std::endl;
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}
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// At this point the geometry_field may still not be known
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// but we'll catch that where more useful...
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#ifdef MAPNIK_DEBUG
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std::clog << "Postgis Plugin: using SRID=" << srid_ << std::endl;
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std::clog << "Postgis Plugin: using geometry_column=" << geometryColumn_ << std::endl;
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#endif
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// collect attribute desc
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std::ostringstream s;
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s << "SELECT * FROM " << populate_tokens(table_) << " LIMIT 0";
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}
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*/
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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int count = rs->getNumFields();
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bool found_key_field = false;
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for (int i=0;i<count;++i)
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{
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std::string fld_name=rs->getFieldName(i);
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int type_oid = rs->getTypeOID(i);
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// validate type of key_field
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if (!found_key_field && !key_field_.empty() && fld_name == key_field_)
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{
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found_key_field = true;
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if (type_oid == 20 || type_oid == 21 || type_oid == 23)
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{
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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}
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else
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{
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std::ostringstream error_s;
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error_s << "invalid type '";
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std::ostringstream type_s;
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type_s << "SELECT oid, typname FROM pg_type WHERE oid = " << type_oid;
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shared_ptr<ResultSet> rs_oid = conn->executeQuery(type_s.str());
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if (rs_oid->next())
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{
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error_s << rs_oid->getValue("typname")
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<< "' (oid:" << rs_oid->getValue("oid") << ")";
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}
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else
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{
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error_s << "oid:" << type_oid << "'";
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}
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rs_oid->close();
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error_s << " for key_field '" << fld_name << "' - "
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<< "must be an integer primary key";
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rs->close();
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throw mapnik::datasource_exception( error_s.str() );
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}
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}
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else
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{
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switch (type_oid)
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{
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case 16: // bool
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Boolean));
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break;
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case 20: // int8
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case 21: // int2
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case 23: // int4
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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break;
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case 700: // float4
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case 701: // float8
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case 1700: // numeric ??
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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case 1042: // bpchar
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case 1043: // varchar
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case 25: // text
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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break;
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default: // should not get here
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#ifdef MAPNIK_DEBUG
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s.str("");
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s << "SELECT oid, typname FROM pg_type WHERE oid = " << type_oid;
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}
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*/
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shared_ptr<ResultSet> rs_oid = conn->executeQuery(s.str());
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if (rs_oid->next())
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{
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std::clog << "Postgis Plugin: unknown type = " << rs_oid->getValue("typname")
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<< " (oid:" << rs_oid->getValue("oid") << ")" << std::endl;
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}
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else
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{
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std::clog << "Postgis Plugin: unknown oid type =" << type_oid << std::endl;
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}
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rs_oid->close();
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#endif
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break;
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}
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}
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}
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rs->close();
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}
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}
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}
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std::string postgis_datasource::name()
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{
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return "postgis";
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}
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mapnik::datasource::datasource_t postgis_datasource::type() const
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{
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return type_;
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}
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layer_descriptor postgis_datasource::get_descriptor() const
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{
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return desc_;
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}
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std::string postgis_datasource::sql_bbox(box2d<double> const& env) const
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{
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std::ostringstream b;
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if (srid_ > 0)
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b << "ST_SetSRID(";
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b << "'BOX3D(";
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b << std::setprecision(16);
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b << env.minx() << " " << env.miny() << ",";
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b << env.maxx() << " " << env.maxy() << ")'::box3d";
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if (srid_ > 0)
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b << ", " << srid_ << ")";
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return b.str();
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}
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std::string postgis_datasource::populate_tokens(const std::string& sql) const
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{
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std::string populated_sql = sql;
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if ( boost::algorithm::icontains(sql,bbox_token_) )
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{
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box2d<double> max_env(-1 * FMAX,-1 * FMAX,FMAX,FMAX);
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std::string max_box = sql_bbox(max_env);
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boost::algorithm::replace_all(populated_sql,bbox_token_,max_box);
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}
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if ( boost::algorithm::icontains(sql,scale_denom_token_) )
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{
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std::ostringstream ss;
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ss << FMAX;
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boost::algorithm::replace_all(populated_sql,scale_denom_token_,ss.str());
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}
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return populated_sql;
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}
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std::string postgis_datasource::populate_tokens(const std::string& sql, double scale_denom, box2d<double> const& env) const
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{
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std::string populated_sql = sql;
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std::string box = sql_bbox(env);
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if ( boost::algorithm::icontains(populated_sql,scale_denom_token_) )
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{
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std::ostringstream ss;
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ss << scale_denom;
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boost::algorithm::replace_all(populated_sql,scale_denom_token_,ss.str());
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}
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if ( boost::algorithm::icontains(populated_sql,bbox_token_) )
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{
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boost::algorithm::replace_all(populated_sql,bbox_token_,box);
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return populated_sql;
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}
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else
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{
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std::ostringstream s;
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if (intersect_min_scale_ > 0 && (scale_denom <= intersect_min_scale_ ))
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{
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s << " WHERE ST_Intersects(\"" << geometryColumn_ << "\"," << box << ")";
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}
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else if (intersect_max_scale_ > 0 && (scale_denom >= intersect_max_scale_ ))
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{
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// do no bbox restriction
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}
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else
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{
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s << " WHERE \"" << geometryColumn_ << "\" && " << box;
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}
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return populated_sql + s.str();
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}
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}
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boost::shared_ptr<IResultSet> postgis_datasource::get_resultset(boost::shared_ptr<Connection> const &conn, const std::string &sql) const
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{
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if (cursor_fetch_size_ > 0)
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{
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// cursor
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std::ostringstream csql;
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std::string cursor_name = conn->new_cursor_name();
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csql << "DECLARE " << cursor_name << " BINARY INSENSITIVE NO SCROLL CURSOR WITH HOLD FOR " << sql << " FOR READ ONLY";
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % csql.str();
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}
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*/
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if (!conn->execute(csql.str()))
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// TODO - better error
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throw mapnik::datasource_exception("Postgis Plugin: error creating cursor for data select." );
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return boost::make_shared<CursorResultSet>(conn, cursor_name, cursor_fetch_size_);
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}
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else
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{
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// no cursor
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/*
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if (show_queries_)
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{
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std::clog << boost::format("PostGIS: sending query: %s\n") % sql;
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}
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*/
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return conn->executeQuery(sql,1);
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}
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}
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featureset_ptr postgis_datasource::features(const query& q) const
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{
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box2d<double> const& box = q.get_bbox();
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double scale_denom = q.scale_denominator();
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ConnectionManager *mgr=ConnectionManager::instance();
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shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
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if (pool)
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{
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shared_ptr<Connection> conn = pool->borrowObject();
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if (conn && conn->isOK())
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{
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PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
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if (!geometryColumn_.length() > 0)
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{
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std::ostringstream s_error;
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s_error << "PostGIS: geometry name lookup failed for table '";
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if (schema_.length() > 0)
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{
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s_error << schema_ << ".";
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}
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s_error << geometry_table_
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<< "'. Please manually provide the 'geometry_field' parameter or add an entry "
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<< "in the geometry_columns for '";
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if (schema_.length() > 0)
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{
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s_error << schema_ << ".";
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}
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s_error << geometry_table_ << "'.";
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throw mapnik::datasource_exception(s_error.str());
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}
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std::ostringstream s;
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s << "SELECT ST_AsBinary(\"" << geometryColumn_ << "\") AS geom";
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mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
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if (!key_field_.empty())
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{
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mapnik::sql_utils::quote_attr(s,key_field_);
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ctx->push(key_field_);
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}
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std::set<std::string> const& props=q.property_names();
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std::set<std::string>::const_iterator pos=props.begin();
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std::set<std::string>::const_iterator end=props.end();
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for ( ;pos != end;++pos)
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{
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mapnik::sql_utils::quote_attr(s,*pos);
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ctx->push(*pos);
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}
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std::string table_with_bbox = populate_tokens(table_,scale_denom,box);
|
|
|
|
s << " from " << table_with_bbox;
|
|
|
|
if (row_limit_ > 0) {
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
boost::shared_ptr<IResultSet> rs = get_resultset(conn, s.str());
|
|
return boost::make_shared<postgis_featureset>(rs, ctx, desc_.get_encoding(), !key_field_.empty());
|
|
}
|
|
else
|
|
{
|
|
throw mapnik::datasource_exception("Postgis Plugin: bad connection");
|
|
}
|
|
}
|
|
return featureset_ptr();
|
|
}
|
|
|
|
featureset_ptr postgis_datasource::features_at_point(coord2d const& pt) const
|
|
{
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn && conn->isOK())
|
|
{
|
|
PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
|
|
|
|
if (!geometryColumn_.length() > 0)
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: geometry name lookup failed for table '";
|
|
if (schema_.length() > 0)
|
|
{
|
|
s_error << schema_ << ".";
|
|
}
|
|
s_error << geometry_table_
|
|
<< "'. Please manually provide the 'geometry_field' parameter or add an entry "
|
|
<< "in the geometry_columns for '";
|
|
if (schema_.length() > 0)
|
|
{
|
|
s_error << schema_ << ".";
|
|
}
|
|
s_error << geometry_table_ << "'.";
|
|
throw mapnik::datasource_exception(s_error.str());
|
|
}
|
|
|
|
std::ostringstream s;
|
|
s << "SELECT ST_AsBinary(\"" << geometryColumn_ << "\") AS geom";
|
|
|
|
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
|
|
|
|
if (!key_field_.empty())
|
|
{
|
|
mapnik::sql_utils::quote_attr(s,key_field_);
|
|
ctx->push(key_field_);
|
|
}
|
|
|
|
std::vector<attribute_descriptor>::const_iterator itr = desc_.get_descriptors().begin();
|
|
std::vector<attribute_descriptor>::const_iterator end = desc_.get_descriptors().end();
|
|
|
|
for ( ; itr != end; ++itr)
|
|
{
|
|
mapnik::sql_utils::quote_attr(s,itr->get_name());
|
|
ctx->push(itr->get_name());
|
|
}
|
|
|
|
box2d<double> box(pt.x,pt.y,pt.x,pt.y);
|
|
std::string table_with_bbox = populate_tokens(table_,FMAX,box);
|
|
|
|
s << " from " << table_with_bbox;
|
|
|
|
if (row_limit_ > 0) {
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
boost::shared_ptr<IResultSet> rs = get_resultset(conn, s.str());
|
|
return boost::make_shared<postgis_featureset>(rs, ctx, desc_.get_encoding(), !key_field_.empty());
|
|
}
|
|
}
|
|
return featureset_ptr();
|
|
}
|
|
|
|
box2d<double> postgis_datasource::envelope() const
|
|
{
|
|
if (extent_initialized_) return extent_;
|
|
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn && conn->isOK())
|
|
{
|
|
PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
|
|
std::ostringstream s;
|
|
|
|
if (!geometryColumn_.length() > 0)
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: unable to query the layer extent of table '";
|
|
if (schema_.length() > 0)
|
|
{
|
|
s_error << schema_ << ".";
|
|
}
|
|
s_error << geometry_table_ << "' because we cannot determine the geometry field name."
|
|
<< "\nPlease provide either an 'extent' parameter to skip this query, "
|
|
<< "a 'geometry_field' and/or 'geometry_table' parameter, or add a "
|
|
<< "record to the 'geometry_columns' for your table.";
|
|
throw mapnik::datasource_exception("Postgis Plugin: " + s_error.str());
|
|
}
|
|
|
|
if (estimate_extent_)
|
|
{
|
|
s << "SELECT ST_XMin(ext),ST_YMin(ext),ST_XMax(ext),ST_YMax(ext)"
|
|
<< " FROM (SELECT ST_Estimated_Extent('";
|
|
|
|
if (schema_.length() > 0)
|
|
{
|
|
s << mapnik::sql_utils::unquote_double(schema_) << "','";
|
|
}
|
|
|
|
s << mapnik::sql_utils::unquote_double(geometry_table_) << "','"
|
|
<< mapnik::sql_utils::unquote_double(geometryColumn_) << "') as ext) as tmp";
|
|
}
|
|
else
|
|
{
|
|
s << "SELECT ST_XMin(ext),ST_YMin(ext),ST_XMax(ext),ST_YMax(ext)"
|
|
<< " FROM (SELECT ST_Extent(" <<geometryColumn_<< ") as ext from ";
|
|
if (extent_from_subquery_)
|
|
{
|
|
// if a subselect limits records then calculating the extent upon the
|
|
// subquery will be faster and the bounds will be more accurate
|
|
s << populate_tokens(table_) << ") as tmp";
|
|
}
|
|
else
|
|
{
|
|
if (schema_.length() > 0)
|
|
{
|
|
s << schema_ << ".";
|
|
}
|
|
|
|
// but if the subquery does not limit records then querying the
|
|
// actual table will be faster as indexes can be used
|
|
s << geometry_table_ << ") as tmp";
|
|
}
|
|
}
|
|
|
|
/*
|
|
if (show_queries_)
|
|
{
|
|
std::clog << boost::format("PostGIS: sending query: %s\n") % s.str();
|
|
}
|
|
*/
|
|
|
|
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
|
|
if (rs->next() && !rs->isNull(0))
|
|
{
|
|
double lox;
|
|
double loy;
|
|
double hix;
|
|
double hiy;
|
|
if (mapnik::conversions::string2double(rs->getValue(0),lox) &&
|
|
mapnik::conversions::string2double(rs->getValue(1),loy) &&
|
|
mapnik::conversions::string2double(rs->getValue(2),hix) &&
|
|
mapnik::conversions::string2double(rs->getValue(3),hiy))
|
|
{
|
|
extent_.init(lox,loy,hix,hiy);
|
|
extent_initialized_ = true;
|
|
}
|
|
else
|
|
{
|
|
std::clog << boost::format("Postgis Plugin: warning: could not determine extent from query: %s\n") % s.str() << std::endl;
|
|
}
|
|
}
|
|
rs->close();
|
|
}
|
|
}
|
|
return extent_;
|
|
}
|
|
|
|
boost::optional<mapnik::datasource::geometry_t> postgis_datasource::get_geometry_type() const
|
|
{
|
|
boost::optional<mapnik::datasource::geometry_t> result;
|
|
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn && conn->isOK())
|
|
{
|
|
PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
|
|
|
|
std::ostringstream s;
|
|
std::string g_type;
|
|
|
|
s << "SELECT lower(type) as type FROM "
|
|
<< GEOMETRY_COLUMNS <<" WHERE f_table_name='"
|
|
<< mapnik::sql_utils::unquote_double(geometry_table_)
|
|
<< "'";
|
|
|
|
if (schema_.length() > 0)
|
|
s << " AND f_table_schema='"
|
|
<< mapnik::sql_utils::unquote_double(schema_)
|
|
<< "'";
|
|
|
|
if (geometry_field_.length() > 0)
|
|
s << " AND f_geometry_column='"
|
|
<< mapnik::sql_utils::unquote_double(geometry_field_)
|
|
<< "'";
|
|
|
|
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
|
|
if (rs->next())
|
|
{
|
|
g_type = rs->getValue("type");
|
|
if (boost::algorithm::contains(g_type,"line"))
|
|
{
|
|
result.reset(mapnik::datasource::LineString);
|
|
return result;
|
|
}
|
|
else if (boost::algorithm::contains(g_type,"point"))
|
|
{
|
|
result.reset(mapnik::datasource::Point);
|
|
return result;
|
|
}
|
|
else if (boost::algorithm::contains(g_type,"polygon"))
|
|
{
|
|
result.reset(mapnik::datasource::Polygon);
|
|
return result;
|
|
}
|
|
else // geometry
|
|
{
|
|
result.reset(mapnik::datasource::Collection);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
// fallback to querying first several features
|
|
if (g_type.empty() && !geometryColumn_.empty())
|
|
{
|
|
s.str("");
|
|
std::string prev_type("");
|
|
s << "SELECT ST_GeometryType(\""
|
|
<< geometryColumn_ << "\") AS geom"
|
|
<< " FROM " << populate_tokens(table_);
|
|
if (row_limit_ > 0 && row_limit_ < 5)
|
|
{
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
else
|
|
{
|
|
s << " LIMIT 5";
|
|
}
|
|
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
|
|
while (rs->next() && !rs->isNull(0))
|
|
{
|
|
const char* data = rs->getValue(0);
|
|
if (boost::algorithm::icontains(data,"line"))
|
|
{
|
|
g_type = "linestring";
|
|
result.reset(mapnik::datasource::LineString);
|
|
}
|
|
else if (boost::algorithm::icontains(data,"point"))
|
|
{
|
|
g_type = "point";
|
|
result.reset(mapnik::datasource::Point);
|
|
}
|
|
else if (boost::algorithm::icontains(data,"polygon"))
|
|
{
|
|
g_type = "polygon";
|
|
result.reset(mapnik::datasource::Polygon);
|
|
}
|
|
else // geometry
|
|
{
|
|
result.reset(mapnik::datasource::Collection);
|
|
return result;
|
|
}
|
|
if (!prev_type.empty() && g_type != prev_type)
|
|
{
|
|
result.reset(mapnik::datasource::Collection);
|
|
return result;
|
|
}
|
|
prev_type = g_type;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
postgis_datasource::~postgis_datasource()
|
|
{
|
|
if (!persist_connection_)
|
|
{
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn)
|
|
{
|
|
conn->close();
|
|
}
|
|
}
|
|
}
|
|
}
|