715 lines
23 KiB
C++
715 lines
23 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 "sqlite_datasource.hpp"
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#include "sqlite_featureset.hpp"
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#include "sqlite_resultset.hpp"
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#include "sqlite_utils.hpp"
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/boolean.hpp>
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#include <mapnik/sql_utils.hpp>
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#include <mapnik/util/geometry_to_ds_type.hpp>
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#include <mapnik/timer.hpp>
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#include <mapnik/wkb.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/filesystem/operations.hpp>
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#include <boost/make_shared.hpp>
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#include <boost/scoped_array.hpp>
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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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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(sqlite_datasource)
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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", "")),
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index_table_(*params_.get<std::string>("index_table", "")),
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key_field_(*params_.get<std::string>("key_field", "")),
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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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intersects_token_("!intersects!"),
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desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding", "utf-8")),
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format_(mapnik::wkbAuto)
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{
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/* TODO
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- throw if no primary key but spatial index is present?
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- remove auto-indexing
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- if spatialite - leverage more of the metadata for geometry type detection
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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 (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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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats__(std::clog, "sqlite_datasource::bind");
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#endif
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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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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 ((dataset_name_.compare(":memory:") != 0) && (!boost::filesystem::exists(dataset_name_)))
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{
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throw datasource_exception("Sqlite Plugin: " + dataset_name_ + " does not exist");
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}
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use_spatial_index_ = *params_.get<mapnik::boolean>("use_spatial_index", true);
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// TODO - remove this option once all datasources have an indexing api
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bool auto_index = *params_.get<mapnik::boolean>("auto_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> 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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{
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format_ = mapnik::wkbSpatiaLite;
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}
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else if (*wkb == "generic")
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{
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format_ = mapnik::wkbGeneric;
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}
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else
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{
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format_ = mapnik::wkbAuto;
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}
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}
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// Populate init_statements_
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// 1. Build attach database statements from the "attachdb" parameter
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// 2. Add explicit init statements from "initdb" parameter
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// Note that we do some extra work to make sure that any attached
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// databases are relative to directory containing dataset_name_. Sqlite
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// will default to attaching from cwd. Typicaly usage means that the
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// map loader will produce full paths here.
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boost::optional<std::string> attachdb = params_.get<std::string>("attachdb");
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if (attachdb)
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{
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parse_attachdb(*attachdb);
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}
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boost::optional<std::string> initdb = params_.get<std::string>("initdb");
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if (initdb)
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{
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init_statements_.push_back(*initdb);
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}
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// now actually create the connection and start executing setup sql
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dataset_ = boost::make_shared<sqlite_connection>(dataset_name_);
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boost::optional<unsigned> table_by_index = params_.get<unsigned>("table_by_index");
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int passed_parameters = 0;
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passed_parameters += params_.get<std::string>("table") ? 1 : 0;
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passed_parameters += table_by_index ? 1 : 0;
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if (passed_parameters > 1)
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{
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throw datasource_exception("SQLite Plugin: you can only select an by name "
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"('table' parameter), by number ('table_by_index' parameter), "
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"do not supply 2 or more of them at the same time" );
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}
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if (table_by_index)
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{
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std::vector<std::string> tables;
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sqlite_utils::get_tables(dataset_,tables);
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if (*table_by_index >= tables.size())
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{
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std::ostringstream s;
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s << "SQLite Plugin: only "
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<< tables.size()
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<< " table(s) exist, cannot find table by index '" << *table_by_index << "'";
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throw datasource_exception(s.str());
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}
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table_ = tables[*table_by_index];
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}
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if (table_.empty())
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{
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throw mapnik::datasource_exception("Sqlite Plugin: missing <table> parameter");
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}
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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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// 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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using_subquery_ = false;
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if (table_ != geometry_table_)
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{
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using_subquery_ = true;
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}
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else
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{
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// attempt to auto-quote table if needed
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if (sqlite_utils::needs_quoting(table_))
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{
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table_ = std::string("[") + table_ + "]";
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geometry_table_ = table_;
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}
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}
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// Execute init_statements_
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for (std::vector<std::string>::const_iterator iter = init_statements_.begin();
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iter != init_statements_.end(); ++iter)
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{
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MAPNIK_LOG_DEBUG(sqlite) << "sqlite_datasource: Execute init sql=" << *iter;
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dataset_->execute(*iter);
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}
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bool found_types_via_subquery = false;
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if (using_subquery_)
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{
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std::ostringstream s;
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std::string query = populate_tokens(table_);
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s << "SELECT " << fields_ << " FROM (" << query << ") LIMIT 1";
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found_types_via_subquery = sqlite_utils::detect_types_from_subquery(
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s.str(),
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geometry_field_,
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desc_,
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dataset_);
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}
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// TODO - consider removing this
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if (key_field_ == "rowid")
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{
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desc_.add_descriptor(attribute_descriptor("rowid", mapnik::Integer));
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}
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bool found_table = sqlite_utils::table_info(key_field_,
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found_types_via_subquery,
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geometry_field_,
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geometry_table_,
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desc_,
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dataset_);
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if (! found_table)
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{
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std::ostringstream s;
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s << "Sqlite Plugin: could not query table '" << geometry_table_ << "'";
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if (using_subquery_)
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{
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s << " from subquery '" << table_ << "'";
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}
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// report get available tables
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std::vector<std::string> tables;
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sqlite_utils::get_tables(dataset_,tables);
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if (tables.size() > 0)
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{
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s << " (available tables for " << dataset_name_ << " are: '" << boost::algorithm::join(tables, ", ") << "')";
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}
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throw datasource_exception(s.str());
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}
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if (geometry_field_.empty())
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{
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std::ostringstream s;
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s << "Sqlite Plugin: unable to detect the column "
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<< "containing a valid geometry on table '" << geometry_table_ << "'. "
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<< "Please provide a column name by passing the 'geometry_field' option "
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<< "or indicate a different spatial table to use by passing the 'geometry_table' option";
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throw datasource_exception(s.str());
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}
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if (index_table_.empty())
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{
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// Generate implicit index_table name - need to do this after
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// we have discovered meta-data or else we don't know the column name
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index_table_ = sqlite_utils::index_for_table(geometry_table_,geometry_field_);
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}
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std::string index_db = sqlite_utils::index_for_db(dataset_name_);
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has_spatial_index_ = false;
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if (use_spatial_index_)
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{
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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats2__(std::clog, "sqlite_datasource::bind(use_spatial_index)");
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#endif
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if (boost::filesystem::exists(index_db))
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{
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dataset_->execute("attach database '" + index_db + "' as " + index_table_);
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}
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has_spatial_index_ = sqlite_utils::has_rtree(index_table_,dataset_);
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if (!has_spatial_index_ && auto_index)
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{
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if (! key_field_.empty())
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{
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std::ostringstream query;
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query << "SELECT "
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<< geometry_field_
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<< "," << key_field_
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<< " FROM ("
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<< geometry_table_ << ")";
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/*
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std::vector<sqlite_utils::rtree_type> rtree_list;
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{
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boost::shared_ptr<sqlite_resultset> rs = dataset_->execute_query(query.str());
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sqlite_utils::build_tree(rs,rtree_list);
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}
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if (sqlite_utils::create_spatial_index2(index_db,index_table_,rtree_list))
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{
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//extent_initialized_ = true;
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has_spatial_index_ = true;
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if (boost::filesystem::exists(index_db))
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{
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dataset_->execute("attach database '" + index_db + "' as " + index_table_);
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}
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}
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*/
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boost::shared_ptr<sqlite_resultset> rs = dataset_->execute_query(query.str());
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if (sqlite_utils::create_spatial_index(index_db,index_table_,rs))
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{
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//extent_initialized_ = true;
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has_spatial_index_ = true;
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if (boost::filesystem::exists(index_db))
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{
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dataset_->execute("attach database '" + index_db + "' as " + index_table_);
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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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std::ostringstream s;
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s << "Sqlite Plugin: key_field is empty for "
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<< geometry_field_
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<< " and "
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<< geometry_table_;
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throw datasource_exception(s.str());
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}
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}
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}
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if (! extent_initialized_)
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{
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// TODO - clean this up - reducing arguments
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std::string query = populate_tokens(table_);
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if (!sqlite_utils::detect_extent(dataset_,
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has_spatial_index_,
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extent_,
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index_table_,
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metadata_,
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geometry_field_,
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geometry_table_,
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key_field_,
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query))
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{
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std::ostringstream s;
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s << "Sqlite Plugin: extent could not be determined for table '"
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<< geometry_table_ << "' and geometry field '" << geometry_field_ << "'"
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<< " because an rtree spatial index is missing or empty."
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<< " - either set the table 'extent' or create an rtree spatial index";
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throw datasource_exception(s.str());
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}
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}
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is_bound_ = true;
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}
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std::string sqlite_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::ifind_first(populated_sql, intersects_token_))
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{
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// replace with dummy comparison that is true
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boost::algorithm::ireplace_first(populated_sql, intersects_token_, "1=1");
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}
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return populated_sql;
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}
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sqlite_datasource::~sqlite_datasource()
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{
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}
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#if (BOOST_FILESYSTEM_VERSION <= 2)
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namespace boost {
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namespace filesystem {
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path read_symlink(const path& p)
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{
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path symlink_path;
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#ifdef BOOST_POSIX_API
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for (std::size_t path_max = 64;; path_max *= 2)// loop 'til buffer is large enough
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{
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boost::scoped_array<char> buf(new char[path_max]);
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ssize_t result;
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if ((result=::readlink(p.string().c_str(), buf.get(), path_max))== -1)
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{
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throw std::runtime_error("could not read symlink");
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}
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else
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{
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if(result != static_cast<ssize_t>(path_max))
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{
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symlink_path.assign(buf.get(), buf.get() + result);
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break;
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}
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}
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}
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#endif
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return symlink_path;
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}
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}
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}
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#endif
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void sqlite_datasource::parse_attachdb(std::string const& attachdb) const
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{
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boost::char_separator<char> sep(",");
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boost::tokenizer<boost::char_separator<char> > tok(attachdb, sep);
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// The attachdb line is a comma sparated list of [dbname@]filename
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for (boost::tokenizer<boost::char_separator<char> >::iterator beg = tok.begin();
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beg != tok.end(); ++beg)
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{
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std::string const& spec(*beg);
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size_t atpos = spec.find('@');
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// See if it contains an @ sign
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if (atpos == spec.npos)
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{
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throw datasource_exception("attachdb parameter has syntax dbname@filename[,...]");
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}
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// Break out the dbname and the filename
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std::string dbname = boost::trim_copy(spec.substr(0, atpos));
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std::string filename = boost::trim_copy(spec.substr(atpos + 1));
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// Normalize the filename and make it relative to dataset_name_
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if (filename.compare(":memory:") != 0)
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{
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boost::filesystem::path child_path(filename);
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// It is a relative path. Fix it.
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if (! child_path.has_root_directory() && ! child_path.has_root_name())
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{
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boost::filesystem::path absolute_path(dataset_name_);
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// support symlinks
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if (boost::filesystem::is_symlink(absolute_path))
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{
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absolute_path = boost::filesystem::read_symlink(absolute_path);
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}
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#if (BOOST_FILESYSTEM_VERSION == 3)
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filename = boost::filesystem::absolute(absolute_path.parent_path() / filename).string();
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#else
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filename = boost::filesystem::complete(absolute_path.branch_path() / filename).normalize().string();
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#endif
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}
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}
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// And add an init_statement_
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init_statements_.push_back("attach database '" + filename + "' as " + dbname);
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}
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}
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const char * sqlite_datasource::name()
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{
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return "sqlite";
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}
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mapnik::datasource::datasource_t 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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boost::optional<mapnik::datasource::geometry_t> sqlite_datasource::get_geometry_type() const
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{
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if (! is_bound_) bind();
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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats__(std::clog, "sqlite_datasource::get_geometry_type");
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#endif
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boost::optional<mapnik::datasource::geometry_t> result;
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if (dataset_)
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{
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// finally, get geometry type by querying first feature
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std::ostringstream s;
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s << "SELECT " << geometry_field_
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<< " FROM " << geometry_table_;
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if (row_limit_ > 0 && row_limit_ < 5)
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{
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s << " LIMIT " << row_limit_;
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}
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else
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{
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s << " LIMIT 5";
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}
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boost::shared_ptr<sqlite_resultset> rs = dataset_->execute_query(s.str());
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int multi_type = 0;
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while (rs->is_valid() && rs->step_next())
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{
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int size;
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const char* data = (const char*) rs->column_blob(0, size);
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if (data)
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{
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boost::ptr_vector<mapnik::geometry_type> paths;
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if (mapnik::geometry_utils::from_wkb(paths, data, size, mapnik::wkbAuto))
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{
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|
mapnik::util::to_ds_type(paths,result);
|
|
if (result)
|
|
{
|
|
int type = static_cast<int>(*result);
|
|
if (multi_type > 0 && multi_type != type)
|
|
{
|
|
result.reset(mapnik::datasource::Collection);
|
|
return result;
|
|
}
|
|
multi_type = type;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
layer_descriptor sqlite_datasource::get_descriptor() const
|
|
{
|
|
if (! is_bound_) bind();
|
|
|
|
return desc_;
|
|
}
|
|
|
|
featureset_ptr sqlite_datasource::features(query const& q) const
|
|
{
|
|
if (! is_bound_) bind();
|
|
|
|
#ifdef MAPNIK_STATS
|
|
mapnik::progress_timer __stats__(std::clog, "sqlite_datasource::features");
|
|
#endif
|
|
|
|
if (dataset_)
|
|
{
|
|
mapnik::box2d<double> const& e = q.get_bbox();
|
|
|
|
std::ostringstream s;
|
|
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
|
|
|
|
s << "SELECT " << geometry_field_;
|
|
if (!key_field_.empty())
|
|
{
|
|
s << "," << key_field_;
|
|
ctx->push(key_field_);
|
|
}
|
|
std::set<std::string> const& props = q.property_names();
|
|
std::set<std::string>::const_iterator pos = props.begin();
|
|
std::set<std::string>::const_iterator end = props.end();
|
|
|
|
for ( ;pos != end;++pos)
|
|
{
|
|
// TODO - should we restrict duplicate key query?
|
|
//if (*pos != key_field_)
|
|
s << ",[" << *pos << "]";
|
|
ctx->push(*pos);
|
|
}
|
|
s << " FROM ";
|
|
|
|
std::string query(table_);
|
|
|
|
if (! key_field_.empty() && has_spatial_index_)
|
|
{
|
|
// TODO - debug warn if fails
|
|
sqlite_utils::apply_spatial_filter(query,
|
|
e,
|
|
table_,
|
|
key_field_,
|
|
index_table_,
|
|
geometry_table_,
|
|
intersects_token_);
|
|
}
|
|
else
|
|
{
|
|
query = populate_tokens(table_);
|
|
}
|
|
|
|
s << query ;
|
|
|
|
if (row_limit_ > 0)
|
|
{
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
if (row_offset_ > 0)
|
|
{
|
|
s << " OFFSET " << row_offset_;
|
|
}
|
|
|
|
MAPNIK_LOG_DEBUG(sqlite) << "sqlite_datasource: " << s.str();
|
|
|
|
boost::shared_ptr<sqlite_resultset> rs(dataset_->execute_query(s.str()));
|
|
|
|
return boost::make_shared<sqlite_featureset>(rs,
|
|
ctx,
|
|
desc_.get_encoding(),
|
|
e,
|
|
format_,
|
|
has_spatial_index_,
|
|
using_subquery_);
|
|
}
|
|
|
|
return featureset_ptr();
|
|
}
|
|
|
|
featureset_ptr sqlite_datasource::features_at_point(coord2d const& pt) const
|
|
{
|
|
if (! is_bound_) bind();
|
|
|
|
#ifdef MAPNIK_STATS
|
|
mapnik::progress_timer __stats__(std::clog, "sqlite_datasource::features_at_point");
|
|
#endif
|
|
|
|
if (dataset_)
|
|
{
|
|
// TODO - need tolerance
|
|
mapnik::box2d<double> const e(pt.x, pt.y, pt.x, pt.y);
|
|
|
|
std::ostringstream s;
|
|
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
|
|
|
|
s << "SELECT " << geometry_field_;
|
|
if (!key_field_.empty())
|
|
{
|
|
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)
|
|
{
|
|
std::string fld_name = itr->get_name();
|
|
if (fld_name != key_field_)
|
|
{
|
|
s << ",[" << itr->get_name() << "]";
|
|
ctx->push(itr->get_name());
|
|
}
|
|
}
|
|
|
|
s << " FROM ";
|
|
|
|
std::string query(table_);
|
|
|
|
if (! key_field_.empty() && has_spatial_index_)
|
|
{
|
|
// TODO - debug warn if fails
|
|
sqlite_utils::apply_spatial_filter(query,
|
|
e,
|
|
table_,
|
|
key_field_,
|
|
index_table_,
|
|
geometry_table_,
|
|
intersects_token_);
|
|
}
|
|
else
|
|
{
|
|
query = populate_tokens(table_);
|
|
}
|
|
|
|
s << query ;
|
|
|
|
if (row_limit_ > 0)
|
|
{
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
if (row_offset_ > 0)
|
|
{
|
|
s << " OFFSET " << row_offset_;
|
|
}
|
|
|
|
MAPNIK_LOG_DEBUG(sqlite) << "sqlite_datasource: " << s.str();
|
|
|
|
boost::shared_ptr<sqlite_resultset> rs(dataset_->execute_query(s.str()));
|
|
|
|
return boost::make_shared<sqlite_featureset>(rs,
|
|
ctx,
|
|
desc_.get_encoding(),
|
|
e,
|
|
format_,
|
|
has_spatial_index_,
|
|
using_subquery_);
|
|
}
|
|
|
|
return featureset_ptr();
|
|
}
|