217 lines
6.3 KiB
C++
217 lines
6.3 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//$Id: postgis.cc 44 2005-04-22 18:53:54Z pavlenko $
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#include "postgis.hpp"
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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 "connection_manager.hpp"
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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 std::cerr;
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using std::cout;
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using std::endl;
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using boost::lexical_cast;
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using boost::bad_lexical_cast;
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using boost::shared_ptr;
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postgis_datasource::postgis_datasource(const parameters& params)
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: table_(params.get("table")),
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type_(datasource::Vector),
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desc_(params.get("name")),
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creator_(params.get("host"),
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params.get("dbname"),
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params.get("user"),
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params.get("password"))
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{
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ConnectionManager *mgr=ConnectionManager::instance();
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mgr->registerPool(creator_,10,20);
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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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const 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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std::string table_name=table_from_sql(table_);
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std::ostringstream s;
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s << "select f_geometry_column,srid,type from ";
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s << GEOMETRY_COLUMNS <<" where f_table_name='"<<table_name<<"'";
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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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try
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{
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srid_ = lexical_cast<int>(rs->getValue("srid"));
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desc_.set_srid(srid_);
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}
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catch (bad_lexical_cast &ex)
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{
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cerr << ex.what() << endl;
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}
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geometryColumn_=rs->getValue("f_geometry_column");
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std::string postgisType=rs->getValue("type");
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}
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rs->close();
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s.str("");
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s << "select xmin(ext),ymin(ext),xmax(ext),ymax(ext)";
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s << " from (select estimated_extent('"<<table_name<<"','"<<geometryColumn_<<"') as ext) as tmp";
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rs=conn->executeQuery(s.str());
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if (rs->next())
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{
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try
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{
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double lox=lexical_cast<double>(rs->getValue(0));
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double loy=lexical_cast<double>(rs->getValue(1));
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double hix=lexical_cast<double>(rs->getValue(2));
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double hiy=lexical_cast<double>(rs->getValue(3));
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extent_.init(lox,loy,hix,hiy);
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}
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catch (bad_lexical_cast &ex)
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{
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cerr << ex.what() << endl;
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}
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}
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rs->close();
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// collect attribute desc
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s.str("");
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s << "select * from "<<table_<<" limit 1";
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rs=conn->executeQuery(s.str());
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if (rs->next())
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{
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int count = rs->getNumFields();
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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 length = rs->getFieldLength(i);
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int type_oid = rs->getTypeOID(i);
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switch (type_oid)
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{
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case 17285: // geometry
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desc_.add_descriptor(attribute_descriptor(fld_name,Geometry));
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break;
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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,Integer,false,length));
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break;
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case 701: // float8
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desc_.add_descriptor(attribute_descriptor(fld_name,Double,false,length));
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case 1042: // bpchar
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case 1043: // varchar
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desc_.add_descriptor(attribute_descriptor(fld_name,String));
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break;
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default: // shouldn't get here
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cout << "unknown type_oid="<<type_oid<<endl;
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desc_.add_descriptor(attribute_descriptor(fld_name,String));
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break;
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}
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}
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}
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}
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}
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}
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std::string postgis_datasource::name_="postgis";
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std::string postgis_datasource::name()
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{
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return name_;
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}
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int postgis_datasource::type() const
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{
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return type_;
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}
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layer_descriptor const& 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::table_from_sql(const std::string& sql)
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{
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std::string table_name(sql);
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transform(table_name.begin(),table_name.end(),table_name.begin(),tolower);
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std::string::size_type idx=table_name.rfind("from");
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if (idx!=std::string::npos)
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{
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idx=table_name.find_first_not_of(" ",idx+4);
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table_name=table_name.substr(idx);
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idx=table_name.find_first_of(" )");
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return table_name.substr(0,idx);
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}
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return table_name;
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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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Featureset *fs=0;
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Envelope<double> const& box=q.get_bbox();
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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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const 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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std::ostringstream s;
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// can we rely on 'gid' name???
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s << "select gid,asbinary("<<geometryColumn_<<") as geom";
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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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while (pos!=props.end())
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{
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s <<",\""<<*pos<<"\"";
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++pos;
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}
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s << " from " << table_<<" where "<<geometryColumn_<<" && setSRID('BOX3D(";
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s << box.minx() << " " << box.miny() << ",";
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s << box.maxx() << " " << box.maxy() << ")'::box3d,"<<srid_<<")";
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cout << s.str() << endl;
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shared_ptr<ResultSet> rs=conn->executeQuery(s.str(),1);
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fs=new postgis_featureset(rs,props.size());
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}
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}
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return featureset_ptr(fs);
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}
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const Envelope<double>& postgis_datasource::envelope() const
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{
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return extent_;
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}
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postgis_datasource::~postgis_datasource() {}
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