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Use geometry_table_ rather than table_ for SRID lookup

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- this will result in a faster query in the case that
   the user provides an explicit geometry_table option
This commit is contained in:
Dane Springmeyer 2015-01-22 15:54:21 -08:00
parent d6175adb1a
commit 4a1f4a9b5e
1 changed files with 24 additions and 21 deletions
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45
plugins/input/postgis/postgis_datasource.cpp
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@ -195,6 +195,8 @@ postgis_datasource::postgis_datasource(parameters const& params)
if (rs->next())
{
geometryColumn_ = rs->getValue("f_geometry_column");
// only accept srid from geometry_tables if
// user has not provided as option
if (srid_ == 0)
{
const char* srid_c = rs->getValue("srid");
@ -211,37 +213,38 @@ postgis_datasource::postgis_datasource(parameters const& params)
}
rs->close();
}
catch (mapnik::datasource_exception const& ex) {
catch (mapnik::datasource_exception const& ex)
{
// let this pass on query error and use the fallback below
MAPNIK_LOG_WARN(postgis) << "postgis_datasource: metadata query failed: " << ex.what();
}
}
// If we still do not know the srid then we can try to fetch
// it from the 'table_' parameter, which should work even if it is
// a subselect as long as we know the geometry_field to query
if (! geometryColumn_.empty() && srid_ <= 0)
// If we still do not know the srid then we can try to fetch
// it from the 'geometry_table_' parameter, which should work even if it is
// a subselect as long as we know the geometry_field to query
if (! geometryColumn_.empty() && srid_ <= 0)
{
std::ostringstream s;
s << "SELECT ST_SRID(\"" << geometryColumn_ << "\") AS srid FROM "
<< populate_tokens(geometry_table_) << " WHERE \"" << geometryColumn_ << "\" IS NOT NULL LIMIT 1;";
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
if (rs->next())
{
s.str("");
s << "SELECT ST_SRID(\"" << geometryColumn_ << "\") AS srid FROM "
<< populate_tokens(table_) << " WHERE \"" << geometryColumn_ << "\" IS NOT NULL LIMIT 1;";
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
if (rs->next())
const char* srid_c = rs->getValue("srid");
if (srid_c != nullptr)
{
const char* srid_c = rs->getValue("srid");
if (srid_c != nullptr)
int result = 0;
const char * end = srid_c + std::strlen(srid_c);
if (mapnik::util::string2int(srid_c, end, result))
{
int result = 0;
const char * end = srid_c + std::strlen(srid_c);
if (mapnik::util::string2int(srid_c, end, result))
{
srid_ = result;
}
srid_ = result;
}
}
rs->close();
}
rs->close();
}
// detect primary key