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ogrsqlitedatasource.cpp
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/******************************************************************************
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: Implements OGRSQLiteDataSource class.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
*
* Contributor: Alessandro Furieri, a.furieri@lqt.it
* Portions of this module properly supporting SpatiaLite Table/Geom creation
* Developed for Faunalia ( http://www.faunalia.it) with funding from
* Regione Toscana - Settore SISTEMA INFORMATIVO TERRITORIALE ED AMBIENTALE
*
******************************************************************************
* Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com>
* Copyright (c) 2009-2013, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "cpl_port.h"
#include "ogr_sqlite.h"
#include "ogrsqlitevirtualogr.h"
#include "ogrsqliteutility.h"
#include "ogrsqlitevfs.h"
#include <cctype>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sys/stat.h>
#include <map>
#include <mutex>
#include <set>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_hash_set.h"
#include "cpl_multiproc.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal.h"
#include "gdal_pam.h"
#include "gdal_priv.h"
#include "ogr_core.h"
#include "ogr_feature.h"
#include "ogr_geometry.h"
#include "ogr_spatialref.h"
#include "ogr_schema_override.h"
#include "ogrsf_frmts.h"
#include "sqlite3.h"
#include "proj.h"
#include "ogr_proj_p.h"
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunknown-pragmas"
#pragma clang diagnostic ignored "-Wdocumentation"
#endif
#if defined(HAVE_SPATIALITE) && !defined(SPATIALITE_DLOPEN)
#include "spatialite.h"
#endif
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#undef SQLITE_STATIC
#define SQLITE_STATIC (static_cast<sqlite3_destructor_type>(nullptr))
// Keep in sync prototype of those 2 functions between gdalopeninfo.cpp,
// ogrsqlitedatasource.cpp and ogrgeopackagedatasource.cpp
void GDALOpenInfoDeclareFileNotToOpen(const char *pszFilename,
const GByte *pabyHeader,
int nHeaderBytes);
void GDALOpenInfoUnDeclareFileNotToOpen(const char *pszFilename);
#ifdef HAVE_SPATIALITE
#ifdef SPATIALITE_DLOPEN
static CPLMutex *hMutexLoadSpatialiteSymbols = nullptr;
static void *(*pfn_spatialite_alloc_connection)(void) = nullptr;
static void (*pfn_spatialite_shutdown)(void) = nullptr;
static void (*pfn_spatialite_init_ex)(sqlite3 *, const void *, int) = nullptr;
static void (*pfn_spatialite_cleanup_ex)(const void *) = nullptr;
static const char *(*pfn_spatialite_version)(void) = nullptr;
#else
static void *(*pfn_spatialite_alloc_connection)(void) =
spatialite_alloc_connection;
static void (*pfn_spatialite_shutdown)(void) = spatialite_shutdown;
static void (*pfn_spatialite_init_ex)(sqlite3 *, const void *,
int) = spatialite_init_ex;
static void (*pfn_spatialite_cleanup_ex)(const void *) = spatialite_cleanup_ex;
static const char *(*pfn_spatialite_version)(void) = spatialite_version;
#endif
#ifndef SPATIALITE_SONAME
#define SPATIALITE_SONAME "libspatialite.so"
#endif
#ifdef SPATIALITE_DLOPEN
static bool OGRSQLiteLoadSpatialiteSymbols()
{
static bool bInitializationDone = false;
CPLMutexHolderD(&hMutexLoadSpatialiteSymbols);
if (bInitializationDone)
return pfn_spatialite_alloc_connection != nullptr;
bInitializationDone = true;
const char *pszLibName =
CPLGetConfigOption("SPATIALITESO", SPATIALITE_SONAME);
CPLPushErrorHandler(CPLQuietErrorHandler);
/* coverity[tainted_string] */
pfn_spatialite_alloc_connection = (void *(*)(void))CPLGetSymbol(
pszLibName, "spatialite_alloc_connection");
CPLPopErrorHandler();
if (pfn_spatialite_alloc_connection == nullptr)
{
CPLDebug("SQLITE", "Cannot find %s in %s",
"spatialite_alloc_connection", pszLibName);
return false;
}
pfn_spatialite_shutdown =
(void (*)(void))CPLGetSymbol(pszLibName, "spatialite_shutdown");
pfn_spatialite_init_ex =
(void (*)(sqlite3 *, const void *, int))CPLGetSymbol(
pszLibName, "spatialite_init_ex");
pfn_spatialite_cleanup_ex = (void (*)(const void *))CPLGetSymbol(
pszLibName, "spatialite_cleanup_ex");
pfn_spatialite_version =
(const char *(*)(void))CPLGetSymbol(pszLibName, "spatialite_version");
if (pfn_spatialite_shutdown == nullptr ||
pfn_spatialite_init_ex == nullptr ||
pfn_spatialite_cleanup_ex == nullptr ||
pfn_spatialite_version == nullptr)
{
pfn_spatialite_shutdown = nullptr;
pfn_spatialite_init_ex = nullptr;
pfn_spatialite_cleanup_ex = nullptr;
pfn_spatialite_version = nullptr;
return false;
}
return true;
}
#endif
/************************************************************************/
/* InitSpatialite() */
/************************************************************************/
bool OGRSQLiteBaseDataSource::InitSpatialite()
{
if (hSpatialiteCtxt == nullptr &&
CPLTestBool(CPLGetConfigOption("SPATIALITE_LOAD", "TRUE")))
{
#ifdef SPATIALITE_DLOPEN
if (!OGRSQLiteLoadSpatialiteSymbols())
return false;
#endif
CPLAssert(hSpatialiteCtxt == nullptr);
hSpatialiteCtxt = pfn_spatialite_alloc_connection();
if (hSpatialiteCtxt != nullptr)
{
pfn_spatialite_init_ex(hDB, hSpatialiteCtxt,
CPLTestBool(CPLGetConfigOption(
"SPATIALITE_INIT_VERBOSE", "FALSE")));
}
}
return hSpatialiteCtxt != nullptr;
}
/************************************************************************/
/* FinishSpatialite() */
/************************************************************************/
void OGRSQLiteBaseDataSource::FinishSpatialite()
{
if (hSpatialiteCtxt != nullptr)
{
auto ctxt = hSpatialiteCtxt;
{
// Current implementation of spatialite_cleanup_ex() (as of libspatialite 5.1)
// is not re-entrant due to the use of xmlCleanupParser()
// Cf https://groups.google.com/g/spatialite-users/c/tsfZ_GDrRKs/m/aj-Dt4xoBQAJ?utm_medium=email&utm_source=footer
static std::mutex oCleanupMutex;
std::lock_guard oLock(oCleanupMutex);
pfn_spatialite_cleanup_ex(ctxt);
}
// coverity[thread1_overwrites_value_in_field]
hSpatialiteCtxt = nullptr;
}
}
/************************************************************************/
/* IsSpatialiteLoaded() */
/************************************************************************/
bool OGRSQLiteBaseDataSource::IsSpatialiteLoaded()
{
return hSpatialiteCtxt != nullptr;
}
#else
bool OGRSQLiteBaseDataSource::InitSpatialite()
{
return false;
}
void OGRSQLiteBaseDataSource::FinishSpatialite()
{
}
bool OGRSQLiteBaseDataSource::IsSpatialiteLoaded()
{
return false;
}
#endif
/************************************************************************/
/* OGRSQLiteDriverUnload() */
/************************************************************************/
void OGRSQLiteDriverUnload(GDALDriver *)
{
#ifdef HAVE_SPATIALITE
if (pfn_spatialite_shutdown != nullptr)
pfn_spatialite_shutdown();
#ifdef SPATIALITE_DLOPEN
if (hMutexLoadSpatialiteSymbols != nullptr)
{
CPLDestroyMutex(hMutexLoadSpatialiteSymbols);
hMutexLoadSpatialiteSymbols = nullptr;
}
#endif
#endif
}
/************************************************************************/
/* DealWithOgrSchemaOpenOption() */
/************************************************************************/
bool OGRSQLiteBaseDataSource::DealWithOgrSchemaOpenOption(
CSLConstList papszOpenOptionsIn)
{
std::string osFieldsSchemaOverrideParam =
CSLFetchNameValueDef(papszOpenOptionsIn, "OGR_SCHEMA", "");
if (!osFieldsSchemaOverrideParam.empty())
{
if (GetUpdate())
{
CPLError(CE_Failure, CPLE_NotSupported,
"OGR_SCHEMA open option is not supported in update mode.");
return false;
}
OGRSchemaOverride osSchemaOverride;
if (!osSchemaOverride.LoadFromJSON(osFieldsSchemaOverrideParam) ||
!osSchemaOverride.IsValid())
{
return false;
}
const auto &oLayerOverrides = osSchemaOverride.GetLayerOverrides();
for (const auto &oLayer : oLayerOverrides)
{
const auto &oLayerName = oLayer.first;
const auto &oLayerFieldOverride = oLayer.second;
const bool bIsFullOverride{oLayerFieldOverride.IsFullOverride()};
auto oFieldOverrides = oLayerFieldOverride.GetFieldOverrides();
std::vector<OGRFieldDefn *> aoFields;
CPLDebug("SQLite", "Applying schema override for layer %s",
oLayerName.c_str());
// Fail if the layer name does not exist
auto poLayer = GetLayerByName(oLayerName.c_str());
if (poLayer == nullptr)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Layer %s not found in SQLite DB", oLayerName.c_str());
return false;
}
// Patch field definitions
auto poLayerDefn = poLayer->GetLayerDefn();
for (int i = 0; i < poLayerDefn->GetFieldCount(); i++)
{
auto poFieldDefn = poLayerDefn->GetFieldDefn(i);
auto oFieldOverride =
oFieldOverrides.find(poFieldDefn->GetNameRef());
if (oFieldOverride != oFieldOverrides.cend())
{
if (oFieldOverride->second.GetFieldType().has_value())
whileUnsealing(poFieldDefn)
->SetType(
oFieldOverride->second.GetFieldType().value());
if (oFieldOverride->second.GetFieldWidth().has_value())
whileUnsealing(poFieldDefn)
->SetWidth(
oFieldOverride->second.GetFieldWidth().value());
if (oFieldOverride->second.GetFieldPrecision().has_value())
whileUnsealing(poFieldDefn)
->SetPrecision(
oFieldOverride->second.GetFieldPrecision()
.value());
if (oFieldOverride->second.GetFieldSubType().has_value())
whileUnsealing(poFieldDefn)
->SetSubType(
oFieldOverride->second.GetFieldSubType()
.value());
if (oFieldOverride->second.GetFieldName().has_value())
whileUnsealing(poFieldDefn)
->SetName(oFieldOverride->second.GetFieldName()
.value()
.c_str());
if (bIsFullOverride)
{
aoFields.push_back(poFieldDefn);
}
oFieldOverrides.erase(oFieldOverride);
}
}
// Error if any field override is not found
if (!oFieldOverrides.empty())
{
CPLError(CE_Failure, CPLE_AppDefined,
"Field %s not found in layer %s",
oFieldOverrides.cbegin()->first.c_str(),
oLayerName.c_str());
return false;
}
// Remove fields not in the override
if (bIsFullOverride)
{
for (int i = poLayerDefn->GetFieldCount() - 1; i >= 0; i--)
{
auto poFieldDefn = poLayerDefn->GetFieldDefn(i);
if (std::find(aoFields.begin(), aoFields.end(),
poFieldDefn) == aoFields.end())
{
whileUnsealing(poLayerDefn)->DeleteFieldDefn(i);
}
}
}
}
}
return true;
}
/************************************************************************/
/* GetSpatialiteVersionNumber() */
/************************************************************************/
int OGRSQLiteBaseDataSource::GetSpatialiteVersionNumber()
{
int v = 0;
#ifdef HAVE_SPATIALITE
if (IsSpatialiteLoaded())
{
const CPLStringList aosTokens(
CSLTokenizeString2(pfn_spatialite_version(), ".", 0));
if (aosTokens.size() >= 2)
{
v = MakeSpatialiteVersionNumber(
atoi(aosTokens[0]), atoi(aosTokens[1]),
aosTokens.size() == 3 ? atoi(aosTokens[2]) : 0);
}
}
#endif
return v;
}
/************************************************************************/
/* AddRelationship() */
/************************************************************************/
bool OGRSQLiteDataSource::AddRelationship(
std::unique_ptr<GDALRelationship> &&relationship,
std::string &failureReason)
{
if (!GetUpdate())
{
CPLError(CE_Failure, CPLE_NotSupported,
"AddRelationship() not supported on read-only dataset");
return false;
}
if (!ValidateRelationship(relationship.get(), failureReason))
{
return false;
}
const std::string &osLeftTableName = relationship->GetLeftTableName();
const std::string &osRightTableName = relationship->GetRightTableName();
const auto &aosLeftTableFields = relationship->GetLeftTableFields();
const auto &aosRightTableFields = relationship->GetRightTableFields();
bool bBaseKeyIsUnique = false;
{
const std::set<std::string> uniqueBaseFieldsUC =
SQLGetUniqueFieldUCConstraints(GetDB(), osLeftTableName.c_str());
if (cpl::contains(uniqueBaseFieldsUC,
CPLString(aosLeftTableFields[0]).toupper()))
{
bBaseKeyIsUnique = true;
}
}
if (!bBaseKeyIsUnique)
{
failureReason = "Base table field must be a primary key field or have "
"a unique constraint set";
return false;
}
OGRSQLiteTableLayer *poRightTable = dynamic_cast<OGRSQLiteTableLayer *>(
GetLayerByName(osRightTableName.c_str()));
if (!poRightTable)
{
failureReason = ("Right table " + osRightTableName +
" is not an existing layer in the dataset")
.c_str();
return false;
}
char *pszForeignKeySQL = nullptr;
if (relationship->GetType() == GDALRelationshipType::GRT_ASSOCIATION)
{
pszForeignKeySQL = sqlite3_mprintf(
"FOREIGN KEY(\"%w\") REFERENCES \"%w\"(\"%w\") DEFERRABLE "
"INITIALLY DEFERRED",
aosRightTableFields[0].c_str(), osLeftTableName.c_str(),
aosLeftTableFields[0].c_str());
}
else
{
pszForeignKeySQL = sqlite3_mprintf(
"FOREIGN KEY(\"%w\") REFERENCES \"%w\"(\"%w\") ON DELETE CASCADE "
"ON UPDATE CASCADE DEFERRABLE INITIALLY DEFERRED",
aosRightTableFields[0].c_str(), osLeftTableName.c_str(),
aosLeftTableFields[0].c_str());
}
int eErr = poRightTable->AddForeignKeysToTable(pszForeignKeySQL);
sqlite3_free(pszForeignKeySQL);
if (eErr != OGRERR_NONE)
{
failureReason = "Could not add foreign keys to table";
return false;
}
char *pszSQL = sqlite3_mprintf(
"CREATE INDEX \"idx_%qw_related_id\" ON \"%w\" (\"%w\");",
osRightTableName.c_str(), osRightTableName.c_str(),
aosRightTableFields[0].c_str());
eErr = SQLCommand(hDB, pszSQL);
sqlite3_free(pszSQL);
if (eErr != OGRERR_NONE)
{
failureReason = ("Could not create index for " + osRightTableName +
" " + aosRightTableFields[0])
.c_str();
return false;
}
m_bHasPopulatedRelationships = false;
m_osMapRelationships.clear();
return true;
}
/************************************************************************/
/* ValidateRelationship() */
/************************************************************************/
bool OGRSQLiteDataSource::ValidateRelationship(
const GDALRelationship *poRelationship, std::string &failureReason)
{
if (poRelationship->GetCardinality() !=
GDALRelationshipCardinality::GRC_ONE_TO_MANY)
{
failureReason = "Only one to many relationships are supported for "
"SQLITE datasources";
return false;
}
if (poRelationship->GetType() != GDALRelationshipType::GRT_COMPOSITE &&
poRelationship->GetType() != GDALRelationshipType::GRT_ASSOCIATION)
{
failureReason = "Only association and composite relationship types are "
"supported for SQLITE datasources";
return false;
}
const std::string &osLeftTableName = poRelationship->GetLeftTableName();
OGRLayer *poLeftTable = GetLayerByName(osLeftTableName.c_str());
if (!poLeftTable)
{
failureReason = ("Left table " + osLeftTableName +
" is not an existing layer in the dataset")
.c_str();
return false;
}
const std::string &osRightTableName = poRelationship->GetRightTableName();
OGRLayer *poRightTable = GetLayerByName(osRightTableName.c_str());
if (!poRightTable)
{
failureReason = ("Right table " + osRightTableName +
" is not an existing layer in the dataset")
.c_str();
return false;
}
const auto &aosLeftTableFields = poRelationship->GetLeftTableFields();
if (aosLeftTableFields.empty())
{
failureReason = "No left table fields were specified";
return false;
}
else if (aosLeftTableFields.size() > 1)
{
failureReason = "Only a single left table field is permitted for the "
"SQLITE relationships";
return false;
}
else
{
// validate left field exists
if (poLeftTable->GetLayerDefn()->GetFieldIndex(
aosLeftTableFields[0].c_str()) < 0 &&
!EQUAL(poLeftTable->GetFIDColumn(), aosLeftTableFields[0].c_str()))
{
failureReason = ("Left table field " + aosLeftTableFields[0] +
" does not exist in " + osLeftTableName)
.c_str();
return false;
}
}
const auto &aosRightTableFields = poRelationship->GetRightTableFields();
if (aosRightTableFields.empty())
{
failureReason = "No right table fields were specified";
return false;
}
else if (aosRightTableFields.size() > 1)
{
failureReason = "Only a single right table field is permitted for the "
"SQLITE relationships";
return false;
}
else
{
// validate right field exists
if (poRightTable->GetLayerDefn()->GetFieldIndex(
aosRightTableFields[0].c_str()) < 0 &&
!EQUAL(poRightTable->GetFIDColumn(),
aosRightTableFields[0].c_str()))
{
failureReason = ("Right table field " + aosRightTableFields[0] +
" does not exist in " + osRightTableName)
.c_str();
return false;
}
}
// ensure relationship is different from existing relationships
for (const auto &kv : m_osMapRelationships)
{
if (osLeftTableName == kv.second->GetLeftTableName() &&
osRightTableName == kv.second->GetRightTableName() &&
aosLeftTableFields == kv.second->GetLeftTableFields() &&
aosRightTableFields == kv.second->GetRightTableFields())
{
failureReason =
"A relationship between these tables and fields already exists";
return false;
}
}
return true;
}
/************************************************************************/
/* OGRSQLiteBaseDataSource() */
/************************************************************************/
OGRSQLiteBaseDataSource::OGRSQLiteBaseDataSource() = default;
/************************************************************************/
/* ~OGRSQLiteBaseDataSource() */
/************************************************************************/
OGRSQLiteBaseDataSource::~OGRSQLiteBaseDataSource()
{
CloseDB();
FinishSpatialite();
if (m_bCallUndeclareFileNotToOpen)
{
GDALOpenInfoUnDeclareFileNotToOpen(m_pszFilename);
}
if (!m_osFinalFilename.empty())
{
if (!bSuppressOnClose)
{
CPLDebug("SQLITE", "Copying temporary file %s onto %s",
m_pszFilename, m_osFinalFilename.c_str());
if (CPLCopyFile(m_osFinalFilename.c_str(), m_pszFilename) != 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Copy temporary file %s onto %s failed", m_pszFilename,
m_osFinalFilename.c_str());
}
}
CPLDebug("SQLITE", "Deleting temporary file %s", m_pszFilename);
if (VSIUnlink(m_pszFilename) != 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Deleting temporary file %s failed", m_pszFilename);
}
}
CPLFree(m_pszFilename);
}
/************************************************************************/
/* CloseDB() */
/************************************************************************/
bool OGRSQLiteBaseDataSource::CloseDB()
{
bool bOK = true;
if (hDB != nullptr)
{
bOK = (sqlite3_close(hDB) == SQLITE_OK);
hDB = nullptr;
// If we opened the DB in read-only mode, there might be spurious
// -wal and -shm files that we can make disappear by reopening in
// read-write
VSIStatBufL sStat;
if (eAccess == GA_ReadOnly &&
!(STARTS_WITH(m_pszFilename, "/vsicurl/") ||
STARTS_WITH(m_pszFilename, "/vsitar/") ||
STARTS_WITH(m_pszFilename, "/vsizip/")) &&
VSIStatL(CPLSPrintf("%s-wal", m_pszFilename), &sStat) == 0)
{
if (sqlite3_open(m_pszFilename, &hDB) != SQLITE_OK)
{
sqlite3_close(hDB);
hDB = nullptr;
}
else if (hDB != nullptr)
{
#ifdef SQLITE_FCNTL_PERSIST_WAL
int nPersistentWAL = -1;
sqlite3_file_control(hDB, "main", SQLITE_FCNTL_PERSIST_WAL,
&nPersistentWAL);
if (nPersistentWAL == 1)
{
nPersistentWAL = 0;
if (sqlite3_file_control(hDB, "main",
SQLITE_FCNTL_PERSIST_WAL,
&nPersistentWAL) == SQLITE_OK)
{
CPLDebug("SQLITE",
"Disabling persistent WAL succeeded");
}
else
{
CPLDebug("SQLITE", "Could not disable persistent WAL");
}
}
#endif
// Dummy request
int nRowCount = 0, nColCount = 0;
char **papszResult = nullptr;
sqlite3_get_table(hDB, "SELECT name FROM sqlite_master WHERE 0",
&papszResult, &nRowCount, &nColCount,
nullptr);
sqlite3_free_table(papszResult);
sqlite3_close(hDB);
hDB = nullptr;
#ifdef DEBUG_VERBOSE
if (VSIStatL(CPLSPrintf("%s-wal", m_pszFilename), &sStat) != 0)
{
CPLDebug("SQLite", "%s-wal file has been removed",
m_pszFilename);
}
#endif
}
}
}
if (pMyVFS)
{
sqlite3_vfs_unregister(pMyVFS);
CPLFree(pMyVFS->pAppData);
CPLFree(pMyVFS);
pMyVFS = nullptr;
}
return bOK;
}
/* Returns the first row of first column of SQL as integer */
OGRErr OGRSQLiteBaseDataSource::PragmaCheck(const char *pszPragma,
const char *pszExpected,
int nRowsExpected)
{
CPLAssert(pszPragma != nullptr);
CPLAssert(pszExpected != nullptr);
CPLAssert(nRowsExpected >= 0);
char **papszResult = nullptr;
int nRowCount = 0;
int nColCount = 0;
char *pszErrMsg = nullptr;
int rc =
sqlite3_get_table(hDB, CPLSPrintf("PRAGMA %s", pszPragma), &papszResult,
&nRowCount, &nColCount, &pszErrMsg);
if (rc != SQLITE_OK)
{
CPLError(CE_Failure, CPLE_AppDefined, "Unable to execute PRAGMA %s: %s",
pszPragma, pszErrMsg ? pszErrMsg : "(null)");
sqlite3_free(pszErrMsg);
return OGRERR_FAILURE;
}
if (nRowCount != nRowsExpected)
{
CPLError(CE_Failure, CPLE_AppDefined,
"bad result for PRAGMA %s, got %d rows, expected %d",
pszPragma, nRowCount, nRowsExpected);
sqlite3_free_table(papszResult);
return OGRERR_FAILURE;
}
if (nRowCount > 0 && !EQUAL(papszResult[1], pszExpected))
{
CPLError(CE_Failure, CPLE_AppDefined,
"invalid %s (expected '%s', got '%s')", pszPragma, pszExpected,
papszResult[1]);
sqlite3_free_table(papszResult);
return OGRERR_FAILURE;
}
sqlite3_free_table(papszResult);
return OGRERR_NONE;
}
/************************************************************************/
/* LoadRelationships() */
/************************************************************************/
void OGRSQLiteBaseDataSource::LoadRelationships() const
{
m_osMapRelationships.clear();
LoadRelationshipsFromForeignKeys({});
m_bHasPopulatedRelationships = true;
}
/************************************************************************/
/* LoadRelationshipsFromForeignKeys() */
/************************************************************************/
void OGRSQLiteBaseDataSource::LoadRelationshipsFromForeignKeys(
const std::vector<std::string> &excludedTables) const
{
if (hDB)
{
std::string osSQL =
"SELECT m.name, p.id, p.seq, p.\"table\" AS base_table_name, "
"p.\"from\", p.\"to\", "
"p.on_delete FROM sqlite_master m "
"JOIN pragma_foreign_key_list(m.name) p ON m.name != p.\"table\" "
"WHERE m.type = 'table' "
// skip over foreign keys which relate to private GPKG tables
"AND base_table_name NOT LIKE 'gpkg_%' "
// Same with NGA GeoInt system tables
"AND base_table_name NOT LIKE 'nga_%' "
// Same with Spatialite system tables
"AND base_table_name NOT IN ('geometry_columns', "
"'spatial_ref_sys', 'views_geometry_columns', "
"'virts_geometry_columns') ";
if (!excludedTables.empty())
{
std::string oExcludedTablesList;
for (const auto &osExcludedTable : excludedTables)
{
oExcludedTablesList += !oExcludedTablesList.empty() ? "," : "";
char *pszEscapedName =
sqlite3_mprintf("'%q'", osExcludedTable.c_str());
oExcludedTablesList += pszEscapedName;
sqlite3_free(pszEscapedName);
}
osSQL += "AND base_table_name NOT IN (" + oExcludedTablesList +
")"
" AND m.name NOT IN (" +
oExcludedTablesList + ") ";
}
osSQL += "ORDER BY m.name";
auto oResult = SQLQuery(hDB, osSQL.c_str());
if (!oResult)
{
CPLError(CE_Failure, CPLE_AppDefined, "Cannot load relationships");
return;
}
for (int iRecord = 0; iRecord < oResult->RowCount(); iRecord++)
{
const char *pszRelatedTableName = oResult->GetValue(0, iRecord);
if (!pszRelatedTableName)
continue;
const char *pszBaseTableName = oResult->GetValue(3, iRecord);
if (!pszBaseTableName)
continue;
const char *pszRelatedFieldName = oResult->GetValue(4, iRecord);
if (!pszRelatedFieldName)
continue;
const char *pszBaseFieldName = oResult->GetValue(5, iRecord);
if (!pszBaseFieldName)
continue;
const int nId = oResult->GetValueAsInteger(1, iRecord);
// form relationship name by appending foreign key id to base and
// related table names
std::ostringstream stream;
stream << pszBaseTableName << '_' << pszRelatedTableName;
if (nId > 0)
{
// note we use nId + 1 here as the first id will be zero, and
// we'd like subsequent relations to have names starting with
// _2, _3 etc, not _1, _2 etc.
stream << '_' << (nId + 1);
}
const std::string osRelationName = stream.str();
const auto it = m_osMapRelationships.find(osRelationName);
if (it != m_osMapRelationships.end())
{
// already have a relationship with this name -- that means that
// the base and related table name and id are the same, so we've
// found a multi-column relationship
auto osListLeftFields = it->second->GetLeftTableFields();
osListLeftFields.emplace_back(pszBaseFieldName);
it->second->SetLeftTableFields(osListLeftFields);
auto osListRightFields = it->second->GetRightTableFields();
osListRightFields.emplace_back(pszRelatedFieldName);
it->second->SetRightTableFields(osListRightFields);
}
else
{
std::unique_ptr<GDALRelationship> poRelationship(
new GDALRelationship(osRelationName, pszBaseTableName,
pszRelatedTableName, GRC_ONE_TO_MANY));
poRelationship->SetLeftTableFields({pszBaseFieldName});
poRelationship->SetRightTableFields({pszRelatedFieldName});
poRelationship->SetRelatedTableType("features");
if (const char *pszOnDeleteAction =
oResult->GetValue(6, iRecord))
{
if (EQUAL(pszOnDeleteAction, "CASCADE"))
{
poRelationship->SetType(GRT_COMPOSITE);
}
}
m_osMapRelationships[osRelationName] =
std::move(poRelationship);
}
}
}
}
/************************************************************************/
/* GetRelationshipNames() */
/************************************************************************/
std::vector<std::string> OGRSQLiteBaseDataSource::GetRelationshipNames(
CPL_UNUSED CSLConstList papszOptions) const
{
if (!m_bHasPopulatedRelationships)
{
LoadRelationships();
}
std::vector<std::string> oasNames;
oasNames.reserve(m_osMapRelationships.size());
for (const auto &kv : m_osMapRelationships)
{
oasNames.emplace_back(kv.first);
}
return oasNames;
}
/************************************************************************/
/* GetRelationship() */
/************************************************************************/
const GDALRelationship *
OGRSQLiteBaseDataSource::GetRelationship(const std::string &name) const
{
if (!m_bHasPopulatedRelationships)
{
LoadRelationships();
}
const auto it = m_osMapRelationships.find(name);
if (it == m_osMapRelationships.end())
return nullptr;
return it->second.get();
}
/***********************************************************************/
/* prepareSql() */
/***********************************************************************/
int OGRSQLiteBaseDataSource::prepareSql(sqlite3 *db, const char *zSql,
int nByte, sqlite3_stmt **ppStmt,
const char **pzTail)
{
const int rc{sqlite3_prepare_v2(db, zSql, nByte, ppStmt, pzTail)};
if (rc != SQLITE_OK && pfnQueryLoggerFunc)
{
std::string error{"Error preparing query: "};
error.append(sqlite3_errmsg(db));
pfnQueryLoggerFunc(zSql, error.c_str(), -1, -1, poQueryLoggerArg);
}
return rc;
}
/************************************************************************/
/* OGRSQLiteDataSource() */
/************************************************************************/
OGRSQLiteDataSource::OGRSQLiteDataSource()
{
m_adfGeoTransform[0] = 0.0;
m_adfGeoTransform[1] = 1.0;
m_adfGeoTransform[2] = 0.0;
m_adfGeoTransform[3] = 0.0;
m_adfGeoTransform[4] = 0.0;
m_adfGeoTransform[5] = 1.0;
}
/************************************************************************/
/* ~OGRSQLiteDataSource() */
/************************************************************************/
OGRSQLiteDataSource::~OGRSQLiteDataSource()
{
OGRSQLiteDataSource::Close();
}
/************************************************************************/
/* Close() */
/************************************************************************/
CPLErr OGRSQLiteDataSource::Close()
{
CPLErr eErr = CE_None;