439 lines
15 KiB
C++
439 lines
15 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) 2010 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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// $Id$
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#include "sqlite_datasource.hpp"
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#include "sqlite_featureset.hpp"
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// mapnik
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#include <mapnik/ptree_helpers.hpp>
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#include <mapnik/sql_utils.hpp>
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/tokenizer.hpp>
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#include <boost/filesystem/operations.hpp>
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using boost::lexical_cast;
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using boost::bad_lexical_cast;
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(sqlite_datasource)
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using mapnik::box2d;
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using mapnik::coord2d;
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using mapnik::query;
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using mapnik::featureset_ptr;
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using mapnik::layer_descriptor;
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using mapnik::attribute_descriptor;
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using mapnik::datasource_exception;
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sqlite_datasource::sqlite_datasource(parameters const& params, bool bind)
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: datasource(params),
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extent_(),
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extent_initialized_(false),
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type_(datasource::Vector),
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table_(*params_.get<std::string>("table","")),
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fields_(*params_.get<std::string>("fields","*")),
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metadata_(*params_.get<std::string>("metadata","")),
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geometry_table_(*params_.get<std::string>("geometry_table","")),
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geometry_field_(*params_.get<std::string>("geometry_field","the_geom")),
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// http://www.sqlite.org/lang_createtable.html#rowid
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key_field_(*params_.get<std::string>("key_field","rowid")),
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row_offset_(*params_.get<int>("row_offset",0)),
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row_limit_(*params_.get<int>("row_limit",0)),
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desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding","utf-8")),
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format_(mapnik::wkbGeneric)
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{
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boost::optional<std::string> file = params_.get<std::string>("file");
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if (!file) throw datasource_exception("Sqlite Plugin: missing <file> parameter");
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if (table_.empty()) throw mapnik::datasource_exception("Sqlite Plugin: missing <table> parameter");
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boost::optional<std::string> wkb = params_.get<std::string>("wkb_format");
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if (wkb)
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{
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if (*wkb == "spatialite")
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format_ = mapnik::wkbSpatiaLite;
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}
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multiple_geometries_ = *params_.get<mapnik::boolean>("multiple_geometries",false);
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use_spatial_index_ = *params_.get<mapnik::boolean>("use_spatial_index",true);
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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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boost::optional<std::string> base = params_.get<std::string>("base");
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if (base)
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dataset_name_ = *base + "/" + *file;
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else
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dataset_name_ = *file;
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if (bind)
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{
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this->bind();
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}
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}
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void sqlite_datasource::bind() const
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{
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if (is_bound_) return;
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if (!boost::filesystem::exists(dataset_name_))
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throw datasource_exception("Sqlite Plugin: " + dataset_name_ + " does not exist");
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dataset_ = new sqlite_connection (dataset_name_);
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if(geometry_table_.empty())
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{
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geometry_table_ = mapnik::table_from_sql(table_);
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}
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if (use_spatial_index_)
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{
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std::ostringstream s;
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s << "SELECT COUNT (*) FROM sqlite_master";
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s << " WHERE LOWER(name) = LOWER('idx_" << geometry_table_ << "_" << geometry_field_ << "')";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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use_spatial_index_ = rs->column_integer (0) == 1;
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}
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if (!use_spatial_index_)
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std::clog << "Sqlite Plugin: spatial index not found for table '"
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<< geometry_table_ << "'" << std::endl;
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}
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if (metadata_ != "" && !extent_initialized_)
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{
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std::ostringstream s;
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s << "SELECT xmin, ymin, xmax, ymax FROM " << metadata_;
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s << " WHERE LOWER(f_table_name) = LOWER('" << geometry_table_ << "')";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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double xmin = rs->column_double (0);
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double ymin = rs->column_double (1);
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double xmax = rs->column_double (2);
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double ymax = rs->column_double (3);
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extent_.init (xmin,ymin,xmax,ymax);
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extent_initialized_ = true;
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}
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}
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if (!extent_initialized_ && use_spatial_index_)
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{
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std::ostringstream s;
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s << "SELECT MIN(xmin), MIN(ymin), MAX(xmax), MAX(ymax) FROM "
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<< "idx_" << geometry_table_ << "_" << geometry_field_;
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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double xmin = rs->column_double (0);
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double ymin = rs->column_double (1);
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double xmax = rs->column_double (2);
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double ymax = rs->column_double (3);
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extent_.init (xmin,ymin,xmax,ymax);
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extent_initialized_ = true;
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}
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}
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{
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// should we deduce column names and types using PRAGMA?
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bool use_pragma_table_info = true;
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if (table_ != geometry_table_)
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{
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// if 'table_' is a subquery then we try to deduce names
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// and types from the first row returned from that query
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use_pragma_table_info = false;
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}
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if (!use_pragma_table_info)
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{
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std::ostringstream s;
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s << "SELECT " << fields_ << " FROM (" << table_ << ") LIMIT 1";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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for (int i = 0; i < rs->column_count (); ++i)
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{
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const int type_oid = rs->column_type (i);
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const char* fld_name = rs->column_name (i);
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switch (type_oid)
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{
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case SQLITE_INTEGER:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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break;
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case SQLITE_FLOAT:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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break;
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case SQLITE_TEXT:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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break;
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case SQLITE_NULL:
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// sqlite reports based on value, not actual column type unless
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// PRAGMA table_info is used so here we assume the column is a string
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// which is a lesser evil than altogether dropping the column
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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case SQLITE_BLOB:
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break;
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default:
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#ifdef MAPNIK_DEBUG
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std::clog << "Sqlite Plugin: unknown type_oid=" << type_oid << std::endl;
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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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else
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{
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// if we do not have at least a row and
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// we cannot determine the right columns types and names
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// as all column_type are SQLITE_NULL
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// so we fallback to using PRAGMA table_info
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use_pragma_table_info = true;
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}
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}
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// TODO - ensure that the supplied key_field is a valid "integer primary key"
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desc_.add_descriptor(attribute_descriptor("rowid",mapnik::Integer));
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if (use_pragma_table_info)
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{
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std::ostringstream s;
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s << "PRAGMA table_info(" << geometry_table_ << ")";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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while (rs->is_valid () && rs->step_next())
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{
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const char* fld_name = rs->column_text(1);
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std::string fld_type(rs->column_text(2));
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boost::algorithm::to_lower(fld_type);
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// see 2.1 "Column Affinity" at http://www.sqlite.org/datatype3.html
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if (boost::algorithm::contains(fld_type,"int"))
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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 if (boost::algorithm::contains(fld_type,"text") ||
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boost::algorithm::contains(fld_type,"char") ||
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boost::algorithm::contains(fld_type,"clob"))
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{
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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}
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else if (boost::algorithm::contains(fld_type,"real") ||
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boost::algorithm::contains(fld_type,"float") ||
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boost::algorithm::contains(fld_type,"double"))
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{
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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}
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//else if (boost::algorithm::contains(fld_type,"blob")
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// desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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#ifdef MAPNIK_DEBUG
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else
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{
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// "Column Affinity" says default to "Numeric" but for now we pass..
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//desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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std::clog << "Sqlite Plugin: unknown type_oid=" << fld_type << std::endl;
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}
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#endif
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}
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}
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}
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is_bound_ = true;
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}
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sqlite_datasource::~sqlite_datasource()
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{
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if (is_bound_)
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{
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delete dataset_;
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}
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}
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std::string sqlite_datasource::name()
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{
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return "sqlite";
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}
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int sqlite_datasource::type() const
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{
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return type_;
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}
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box2d<double> sqlite_datasource::envelope() const
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{
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if (!is_bound_) bind();
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return extent_;
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}
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layer_descriptor sqlite_datasource::get_descriptor() const
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{
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if (!is_bound_) bind();
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return desc_;
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}
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featureset_ptr sqlite_datasource::features(query const& q) const
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{
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if (!is_bound_) bind();
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if (dataset_)
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{
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mapnik::box2d<double> const& e = q.get_bbox();
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std::ostringstream s;
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s << "SELECT " << geometry_field_ << "," << key_field_;
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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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while (pos != 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 ";
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std::string query (table_);
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if (use_spatial_index_)
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{
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std::ostringstream spatial_sql;
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spatial_sql << std::setprecision(16);
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spatial_sql << " WHERE " << key_field_ << " IN (SELECT pkid FROM idx_" << geometry_table_ << "_" << geometry_field_;
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spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
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spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
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if (boost::algorithm::ifind_first(query, "WHERE"))
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{
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boost::algorithm::ireplace_first(query, "WHERE", spatial_sql.str() + " AND ");
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}
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else if (boost::algorithm::ifind_first(query, geometry_table_))
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{
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boost::algorithm::ireplace_first(query, table_, table_ + " " + spatial_sql.str());
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}
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}
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s << query ;
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if (row_limit_ > 0) {
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s << " LIMIT " << row_limit_;
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}
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if (row_offset_ > 0) {
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s << " OFFSET " << row_offset_;
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}
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#ifdef MAPNIK_DEBUG
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std::clog << "Sqlite Plugin: " << s.str() << std::endl;
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#endif
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boost::shared_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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return featureset_ptr (new sqlite_featureset(rs, desc_.get_encoding(), format_, multiple_geometries_));
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}
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return featureset_ptr();
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}
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featureset_ptr sqlite_datasource::features_at_point(coord2d const& pt) const
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{
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if (!is_bound_) bind();
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if (dataset_)
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{
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// TODO - need tolerance
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mapnik::box2d<double> const e(pt.x,pt.y,pt.x,pt.y);
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std::ostringstream s;
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s << "SELECT " << geometry_field_ << "," << key_field_;
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std::vector<attribute_descriptor>::const_iterator itr = desc_.get_descriptors().begin();
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std::vector<attribute_descriptor>::const_iterator end = desc_.get_descriptors().end();
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while (itr != end)
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{
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std::string fld_name = itr->get_name();
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if (fld_name != key_field_)
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s << ",\"" << itr->get_name() << "\"";
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++itr;
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}
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s << " FROM ";
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std::string query (table_);
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if (use_spatial_index_)
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{
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std::ostringstream spatial_sql;
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spatial_sql << std::setprecision(16);
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spatial_sql << " WHERE " << key_field_ << " IN (SELECT pkid FROM idx_" << geometry_table_ << "_" << geometry_field_;
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spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
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spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
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if (boost::algorithm::ifind_first(query, "WHERE"))
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{
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boost::algorithm::ireplace_first(query, "WHERE", spatial_sql.str() + " AND ");
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}
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else if (boost::algorithm::ifind_first(query, geometry_table_))
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{
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boost::algorithm::ireplace_first(query, table_, table_ + " " + spatial_sql.str());
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}
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}
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s << query ;
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if (row_limit_ > 0) {
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s << " LIMIT " << row_limit_;
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}
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if (row_offset_ > 0) {
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s << " OFFSET " << row_offset_;
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}
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#ifdef MAPNIK_DEBUG
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std::clog << "Sqlite Plugin: " << s.str() << std::endl;
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#endif
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boost::shared_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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return featureset_ptr (new sqlite_featureset(rs, desc_.get_encoding(), format_, multiple_geometries_));
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}
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return featureset_ptr();
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}
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