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throw if table is not supplied, quote field names, use spatial index to get extent, and default to built in alias for the primary key ('rowid') if key_field is not supplied

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This commit is contained in:
Dane Springmeyer 2011-03-31 22:32:22 +00:00
parent e9e805690f
commit 23639271fe
1 changed files with 39 additions and 20 deletions
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55
plugins/input/sqlite/sqlite_datasource.cpp
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@ -61,7 +61,8 @@ sqlite_datasource::sqlite_datasource(parameters const& params, bool bind)
metadata_(*params_.get<std::string>("metadata","")),
geometry_table_(*params_.get<std::string>("geometry_table","")),
geometry_field_(*params_.get<std::string>("geometry_field","the_geom")),
key_field_(*params_.get<std::string>("key_field","OGC_FID")),
// http://www.sqlite.org/lang_createtable.html#rowid
key_field_(*params_.get<std::string>("key_field","rowid")),
row_offset_(*params_.get<int>("row_offset",0)),
row_limit_(*params_.get<int>("row_limit",0)),
desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding","utf-8")),
@ -70,6 +71,8 @@ sqlite_datasource::sqlite_datasource(parameters const& params, bool bind)
boost::optional<std::string> file = params_.get<std::string>("file");
if (!file) throw datasource_exception("Sqlite Plugin: missing <file> parameter");
if (table_.empty()) throw mapnik::datasource_exception("Sqlite Plugin: missing <table> parameter");
boost::optional<std::string> wkb = params_.get<std::string>("wkb_format");
if (wkb)
{
@ -109,6 +112,23 @@ void sqlite_datasource::bind() const
geometry_table_ = mapnik::table_from_sql(table_);
}
if (use_spatial_index_)
{
std::ostringstream s;
s << "SELECT COUNT (*) FROM sqlite_master";
s << " WHERE LOWER(name) = LOWER('idx_" << geometry_table_ << "_" << geometry_field_ << "')";
boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
if (rs->is_valid () && rs->step_next())
{
use_spatial_index_ = rs->column_integer (0) == 1;
}
if (!use_spatial_index_)
std::clog << "Sqlite Plugin: spatial index not found for table '"
<< geometry_table_ << "'" << std::endl;
}
if (metadata_ != "" && !extent_initialized_)
{
std::ostringstream s;
@ -127,21 +147,22 @@ void sqlite_datasource::bind() const
}
}
if (use_spatial_index_)
if (!extent_initialized_ && use_spatial_index_)
{
std::ostringstream s;
s << "SELECT COUNT (*) FROM sqlite_master";
s << " WHERE LOWER(name) = LOWER('idx_" << geometry_table_ << "_" << geometry_field_ << "')";
s << "SELECT xmin, ymin, xmax, ymax FROM "
<< "idx_" << geometry_table_ << "_" << geometry_field_;
boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
if (rs->is_valid () && rs->step_next())
{
use_spatial_index_ = rs->column_integer (0) == 1;
}
double xmin = rs->column_double (0);
double ymin = rs->column_double (1);
double xmax = rs->column_double (2);
double ymax = rs->column_double (3);
#ifdef MAPNIK_DEBUG
if (! use_spatial_index_)
std::clog << "Sqlite Plugin: cannot use the spatial index " << std::endl;
#endif
extent_.init (xmin,ymin,xmax,ymax);
extent_initialized_ = true;
}
}
{
@ -152,7 +173,7 @@ void sqlite_datasource::bind() const
*/
std::ostringstream s;
s << "SELECT " << fields_ << " FROM (" << geometry_table_ << ") LIMIT 1";
s << "SELECT " << fields_ << " FROM (" << table_ << ") LIMIT 1";
boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
if (rs->is_valid () && rs->step_next())
@ -237,8 +258,8 @@ featureset_ptr sqlite_datasource::features(query const& q) const
std::set<std::string>::const_iterator end = props.end();
while (pos != end)
{
s << "," << *pos << "";
++pos;
s << ",\"" << *pos << "\"";
++pos;
}
s << " FROM ";
@ -249,11 +270,9 @@ featureset_ptr sqlite_datasource::features(query const& q) const
{
std::ostringstream spatial_sql;
spatial_sql << std::setprecision(16);
// TODO - rowid must be explicitly included in subselects
// should we use primary key here instead?
spatial_sql << " WHERE rowid IN (SELECT pkid FROM idx_" << geometry_table_ << "_" << geometry_field_;
spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
spatial_sql << " WHERE " << key_field_ << " IN (SELECT pkid FROM idx_" << geometry_table_ << "_" << geometry_field_;
spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
if (boost::algorithm::ifind_first(query, "WHERE"))
{
boost::algorithm::ireplace_first(query, "WHERE", spatial_sql.str() + " AND ");