sch_io_database.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2022 Jon Evans <[email protected]>
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include <iostream>
#include <string_view>
#include <unordered_set>
#include <utility>
#include <wx/datetime.h>
#include <wx/log.h>
#include <wx/tokenzr.h>
 
#include <boost/algorithm/string.hpp>
 
#include <libraries/symbol_library_adapter.h>
#include <database/database_connection.h>
#include <database/database_lib_settings.h>
#include <fmt.h>
#include <hash.h>
#include <ki_exception.h>
#include <lib_symbol.h>
 
#include "sch_io_database.h"
 
#include <dialog_database_lib_settings.h>
 
 
SCH_IO_DATABASE::SCH_IO_DATABASE() :
        SCH_IO( wxS( "Database library" ) ),
        m_adapter( nullptr ),
        m_settings(),
        m_conn()
{
    m_cacheTimestamp = 0;
    m_cachePopulated = false;
    m_cacheSignature = 0;
}
 
 
SCH_IO_DATABASE::~SCH_IO_DATABASE()
{
}
 
 
void SCH_IO_DATABASE::EnumerateSymbolLib( wxArrayString&    aSymbolNameList,
                                          const wxString&   aLibraryPath,
                                          const std::map<std::string, UTF8>* aProperties )
{
    std::vector<LIB_SYMBOL*> symbols;
    EnumerateSymbolLib( symbols, aLibraryPath, aProperties );
 
    for( LIB_SYMBOL* symbol : symbols )
        aSymbolNameList.Add( symbol->GetName() );
}
 
 
void SCH_IO_DATABASE::EnumerateSymbolLib( std::vector<LIB_SYMBOL*>& aSymbolList,
                                          const wxString&           aLibraryPath,
                                          const std::map<std::string, UTF8>*         aProperties )
{
    wxCHECK_RET( m_adapter, "Database plugin missing library manager adapter handle!" );
    ensureSettings( aLibraryPath );
    ensureConnection();
    cacheLib();
 
    if( !m_conn )
        THROW_IO_ERROR( m_lastError );
 
    bool powerSymbolsOnly = ( aProperties && aProperties->contains( SYMBOL_LIBRARY_ADAPTER::PropPowerSymsOnly ) );
 
    for( auto const& pair : m_nameToSymbolcache )
    {
        LIB_SYMBOL* symbol = pair.second.get();
 
        if( !powerSymbolsOnly || symbol->IsPower() )
            aSymbolList.emplace_back( symbol );
    }
}
 
 
LIB_SYMBOL* SCH_IO_DATABASE::LoadSymbol( const wxString&   aLibraryPath,
                                         const wxString&   aAliasName,
                                         const std::map<std::string, UTF8>* aProperties )
{
    wxCHECK_MSG( m_adapter, nullptr, "Database plugin missing library manager adapter handle!" );
    ensureSettings( aLibraryPath );
    ensureConnection();
 
    if( !m_conn )
        THROW_IO_ERROR( m_lastError );
 
    cacheLib();
 
    /*
     * Table names are tricky, in order to allow maximum flexibility to the user.
     * The slash character is used as a separator between a table name and symbol name, but symbol
     * names may also contain slashes and table names may now also be empty (which results in the
     * slash being dropped in the symbol name when placing a new symbol).  So, if a slash is found,
     * we check if the string before the slash is a valid table name.  If not, we assume the table
     * name is blank if our config has an entry for the null table.
     */
 
    std::string tableName;
    std::string symbolName( aAliasName.ToUTF8() );
 
    auto sanitizedIt = m_sanitizedNameMap.find( aAliasName );
 
    if( sanitizedIt != m_sanitizedNameMap.end() )
    {
        tableName = sanitizedIt->second.first;
        symbolName = sanitizedIt->second.second;
    }
    else
    {
        tableName.clear();
 
        if( aAliasName.Contains( '/' ) )
        {
            tableName = std::string( aAliasName.BeforeFirst( '/' ).ToUTF8() );
            symbolName = std::string( aAliasName.AfterFirst( '/' ).ToUTF8() );
        }
    }
 
    std::vector<const DATABASE_LIB_TABLE*> tablesToTry;
 
    for( const DATABASE_LIB_TABLE& tableIter : m_settings->m_Tables )
    {
        // no table means globally unique keys, try all tables
        if( tableName.empty() || tableIter.name == tableName )
            tablesToTry.emplace_back( &tableIter );
    }
 
    if( tablesToTry.empty() )
    {
        wxLogTrace( traceDatabase, wxT( "LoadSymbol: table '%s' not found in config" ), tableName );
        return nullptr;
    }
 
    const DATABASE_LIB_TABLE* foundTable = nullptr;
    DATABASE_CONNECTION::ROW result;
 
    for( const DATABASE_LIB_TABLE* table : tablesToTry )
    {
        if( m_conn->SelectOne( table->table, std::make_pair( table->key_col, symbolName ),
                               result ) )
        {
            foundTable = table;
            wxLogTrace( traceDatabase, wxT( "LoadSymbol: SelectOne (%s, %s) found in %s" ),
                        table->key_col, symbolName, table->table );
        }
        else
        {
            wxLogTrace( traceDatabase, wxT( "LoadSymbol: SelectOne (%s, %s) failed for table %s" ),
                        table->key_col, symbolName, table->table );
        }
    }
 
    if( !foundTable )
        return nullptr;
 
    return loadSymbolFromRow( aAliasName, *foundTable, result ).release();
}
 
 
void SCH_IO_DATABASE::GetSubLibraryNames( std::vector<wxString>& aNames )
{
    ensureSettings( wxEmptyString );
 
    aNames.clear();
 
    std::set<wxString> tableNames;
 
    for( const DATABASE_LIB_TABLE& tableIter : m_settings->m_Tables )
    {
        if( tableNames.count( tableIter.name ) )
            continue;
 
        aNames.emplace_back( tableIter.name );
        tableNames.insert( tableIter.name );
    }
}
 
 
void SCH_IO_DATABASE::GetAvailableSymbolFields( std::vector<wxString>& aNames )
{
    std::copy( m_customFields.begin(), m_customFields.end(), std::back_inserter( aNames ) );
}
 
 
void SCH_IO_DATABASE::GetDefaultSymbolFields( std::vector<wxString>& aNames )
{
    std::copy( m_defaultShownFields.begin(), m_defaultShownFields.end(),
               std::back_inserter( aNames ) );
}
 
 
bool SCH_IO_DATABASE::TestConnection( wxString* aErrorMsg )
{
    if( m_conn && m_conn->IsConnected() )
        return true;
 
    connect();
 
    if( aErrorMsg && ( !m_conn || !m_conn->IsConnected() ) )
        *aErrorMsg = m_lastError;
 
    return m_conn && m_conn->IsConnected();
}
 
 
void SCH_IO_DATABASE::cacheLib()
{
    // Guard against re-entrant cacheLib() calls. A self-referential symbol row (issue #24249)
    // causes m_adapter->LoadSymbol to route back into SCH_IO_DATABASE::LoadSymbol, which would
    // otherwise call cacheLib() again while it is in the middle of populating its caches.
    if( m_inCacheLib )
        return;
 
    long long currentTimestampSeconds = wxDateTime::Now().GetValue().GetValue() / 1000;
 
    // The materialized LIB_SYMBOL cache is expensive to rebuild for large databases because every
    // row is duplicated from its source library and has all of its fields processed. Re-check the
    // database only after max_age has elapsed, and even then rebuild the symbols only if the
    // underlying row data has actually changed. The global library modify hash must not gate this:
    // the async library loader bumps it whenever any unrelated library finishes loading, which
    // would otherwise freeze the symbol chooser for seconds at a time.
    if( m_cachePopulated
        && ( currentTimestampSeconds - m_cacheTimestamp ) < m_settings->m_Cache.max_age )
    {
        return;
    }
 
    m_inCacheLib = true;
 
    struct CACHE_LIB_GUARD
    {
        bool* flag;
        ~CACHE_LIB_GUARD() { *flag = false; }
    } cacheLibGuard{ &m_inCacheLib };
 
    // Re-query the database (the connection layer caches results subject to its own max_age) and
    // compute a lightweight signature of the raw rows so we can skip the costly materialization
    // when nothing relevant has changed.
    std::vector<std::pair<const DATABASE_LIB_TABLE*, std::vector<DATABASE_CONNECTION::ROW>>> tableResults;
    size_t signature = 0;
 
    for( const DATABASE_LIB_TABLE& table : m_settings->m_Tables )
    {
        std::vector<DATABASE_CONNECTION::ROW> results;
 
        if( !m_conn->SelectAll( table.table, table.key_col, results ) )
        {
            if( !m_conn->GetLastError().empty() )
            {
                wxString msg = wxString::Format( _( "Error reading database table %s: %s" ),
                                                 table.table, m_conn->GetLastError() );
                THROW_IO_ERROR( msg );
            }
 
            continue;
        }
 
        hash_combine( signature, std::string_view( table.table ) );
 
        for( const DATABASE_CONNECTION::ROW& result : results )
        {
            for( const auto& [column, value] : result )
            {
                hash_combine( signature, std::string_view( column ) );
 
                if( const std::string* str = std::any_cast<std::string>( &value ) )
                    hash_combine( signature, std::string_view( *str ) );
            }
 
            // The materialized symbols are duplicated from their source libraries, so fold the
            // modify hash of each referenced (and loaded) source library into the signature. This
            // rebuilds the cache when a dependency actually changes - for example when an
            // asynchronously loaded source library finishes loading and a previously empty
            // placeholder can now be resolved - without being disturbed by unrelated libraries.
            if( auto it = result.find( table.symbols_col ); it != result.end() )
            {
                if( const std::string* str = std::any_cast<std::string>( &it->second ) )
                {
                    LIB_ID symbolId;
                    symbolId.Parse( *str );
 
                    if( symbolId.IsValid() )
                    {
                        const UTF8& nickname = symbolId.GetLibNickname();
                        hash_combine( signature, std::string_view( nickname.c_str() ) );
 
                        if( std::optional<int> libHash = m_adapter->GetLibraryModifyHash( nickname ) )
                            hash_combine( signature, *libHash );
                    }
                }
            }
        }
 
        tableResults.emplace_back( &table, std::move( results ) );
    }
 
    if( m_cachePopulated && signature == m_cacheSignature )
    {
        // Data is unchanged; just reset the timer so we throttle the next re-check.
        m_cacheTimestamp = currentTimestampSeconds;
        return;
    }
 
    std::map<wxString, std::unique_ptr<LIB_SYMBOL>> newSymbolCache;
    std::map<wxString, std::pair<std::string, std::string>> newSanitizedNameMap;
 
    for( const auto& [table, results] : tableResults )
    {
        for( const DATABASE_CONNECTION::ROW& result : results )
        {
            if( !result.count( table->key_col ) )
                continue;
 
            std::string rawName = std::any_cast<std::string>( result.at( table->key_col ) );
            UTF8        sanitizedName = LIB_ID::FixIllegalChars( rawName, false );
            std::string sanitizedKey = sanitizedName.c_str();
            std::string prefix =
                    ( m_settings->m_GloballyUniqueKeys || table->name.empty() ) ? "" : fmt::format( "{}/", table->name );
            std::string sanitizedDisplayName = fmt::format( "{}{}", prefix, sanitizedKey );
            wxString    name( sanitizedDisplayName );
 
            newSanitizedNameMap[name] = std::make_pair( table->name, rawName );
 
            std::unique_ptr<LIB_SYMBOL> symbol = loadSymbolFromRow( name, *table, result );
 
            if( symbol )
                newSymbolCache[symbol->GetName()] = std::move( symbol );
        }
    }
 
    m_nameToSymbolcache = std::move( newSymbolCache );
    m_sanitizedNameMap = std::move( newSanitizedNameMap );
 
    m_cacheTimestamp = currentTimestampSeconds;
    m_cacheSignature = signature;
    m_cachePopulated = true;
}
 
void SCH_IO_DATABASE::ensureSettings( const wxString& aSettingsPath )
{
    auto tryLoad =
            [&]()
            {
                if( !m_settings->LoadFromFile() )
                {
                    wxString msg = wxString::Format(
                        _( "Could not load database library: settings file %s missing or invalid" ),
                        aSettingsPath );
 
                    THROW_IO_ERROR( msg );
                }
            };
 
    if( !m_settings && !aSettingsPath.IsEmpty() )
    {
        std::string path( aSettingsPath.ToUTF8() );
        m_settings = std::make_unique<DATABASE_LIB_SETTINGS>( path );
        m_settings->SetReadOnly( true );
 
        tryLoad();
    }
    else if( !m_conn && m_settings )
    {
        // If we have valid settings but no connection yet; reload settings in case user is editing
        tryLoad();
    }
    else if( m_conn && m_settings && !aSettingsPath.IsEmpty() )
    {
        wxASSERT_MSG( aSettingsPath == m_settings->GetFilename(),
                      "Path changed for database library without re-initializing plugin!" );
    }
    else if( !m_settings )
    {
        wxLogTrace( traceDatabase, wxT( "ensureSettings: no settings but no valid path!" ) );
    }
}
 
 
void SCH_IO_DATABASE::ensureConnection()
{
    wxCHECK_RET( m_settings, "Call ensureSettings before ensureConnection!" );
 
    connect();
 
    if( !m_conn || !m_conn->IsConnected() )
    {
        wxString msg = wxString::Format(
                    _( "Could not load database library: could not connect to database %s (%s)" ),
                    m_settings->m_Source.dsn, m_lastError );
 
        THROW_IO_ERROR( msg );
    }
}
 
 
void SCH_IO_DATABASE::connect()
{
    wxCHECK_RET( m_settings, "Call ensureSettings before connect()!" );
 
    if( m_conn && !m_conn->IsConnected() )
        m_conn.reset();
 
    if( !m_conn )
    {
        if( m_settings->m_Source.connection_string.empty() )
        {
            m_conn = std::make_unique<DATABASE_CONNECTION>( m_settings->m_Source.dsn,
                                                            m_settings->m_Source.username,
                                                            m_settings->m_Source.password,
                                                            m_settings->m_Source.timeout );
        }
        else
        {
            std::string cs = m_settings->m_Source.connection_string;
            std::string basePath( wxFileName( m_settings->GetFilename() ).GetPath().ToUTF8() );
 
            // Database drivers that use files operate on absolute paths, so provide a mechanism
            // for specifying on-disk databases that live next to the kicad_dbl file
            boost::replace_all( cs, "${CWD}", basePath );
 
            m_conn = std::make_unique<DATABASE_CONNECTION>( cs, m_settings->m_Source.timeout );
        }
 
        if( !m_conn->IsConnected() )
        {
            m_lastError = m_conn->GetLastError();
            m_conn.reset();
            return;
        }
 
        for( const DATABASE_LIB_TABLE& tableIter : m_settings->m_Tables )
        {
            std::set<std::string> columns;
 
            columns.insert( boost::to_lower_copy( tableIter.key_col ) );
            columns.insert( boost::to_lower_copy( tableIter.footprints_col ) );
            columns.insert( boost::to_lower_copy( tableIter.symbols_col ) );
 
            columns.insert( boost::to_lower_copy( tableIter.properties.description ) );
            columns.insert( boost::to_lower_copy( tableIter.properties.footprint_filters ) );
            columns.insert( boost::to_lower_copy( tableIter.properties.keywords ) );
            columns.insert( boost::to_lower_copy( tableIter.properties.exclude_from_sim ) );
            columns.insert( boost::to_lower_copy( tableIter.properties.exclude_from_bom ) );
            columns.insert( boost::to_lower_copy( tableIter.properties.exclude_from_board ) );
 
            for( const DATABASE_FIELD_MAPPING& field : tableIter.fields )
                columns.insert( boost::to_lower_copy( field.column ) );
 
            m_conn->CacheTableInfo( tableIter.table, columns );
        }
 
        m_conn->SetCacheParams( m_settings->m_Cache.max_size, m_settings->m_Cache.max_age );
    }
}
 
 
std::optional<bool> SCH_IO_DATABASE::boolFromAny( const std::any& aVal )
{
    try
    {
        bool val = std::any_cast<bool>( aVal );
        return val;
    }
    catch( const std::bad_any_cast& )
    {
    }
 
    try
    {
        int val = std::any_cast<int>( aVal );
        return static_cast<bool>( val );
    }
    catch( const std::bad_any_cast& )
    {
    }
 
    try
    {
        wxString strval( std::any_cast<std::string>( aVal ).c_str(), wxConvUTF8 );
 
        if( strval.IsEmpty() )
            return std::nullopt;
 
        strval.MakeLower();
 
        for( const auto& trueVal : { wxS( "true" ), wxS( "yes" ), wxS( "y" ), wxS( "1" ) } )
        {
            if( strval.Matches( trueVal ) )
                return true;
        }
 
        for( const auto& falseVal : { wxS( "false" ), wxS( "no" ), wxS( "n" ), wxS( "0" ) } )
        {
            if( strval.Matches( falseVal ) )
                return false;
        }
    }
    catch( const std::bad_any_cast& )
    {
    }
 
    return std::nullopt;
}
 
 
std::unique_ptr<LIB_SYMBOL>  SCH_IO_DATABASE::loadSymbolFromRow( const wxString& aSymbolName,
                                                const DATABASE_LIB_TABLE& aTable,
                                                const DATABASE_CONNECTION::ROW& aRow )
{
    std::unique_ptr<LIB_SYMBOL> symbol = nullptr;
 
    if( aRow.count( aTable.symbols_col ) )
    {
        LIB_SYMBOL* originalSymbol = nullptr;
 
        // TODO: Support multiple options for symbol
        std::string symbolIdStr = std::any_cast<std::string>( aRow.at( aTable.symbols_col ) );
        LIB_ID symbolId;
        symbolId.Parse( std::any_cast<std::string>( aRow.at( aTable.symbols_col ) ) );
 
        // A row's Symbols column may resolve back into the same database library (issue #24249,
        // e.g. a mistyped library nickname). The adapter would route that lookup back into
        // SCH_IO_DATABASE::LoadSymbol and re-enter loadSymbolFromRow on the same row until the
        // stack overflows. Track in-flight LIB_IDs and skip the recursive load on re-entry.
        struct CYCLE_GUARD
        {
            std::unordered_set<wxString>* set;
            wxString                      key;
            bool                          owns = false;
 
            ~CYCLE_GUARD()
            {
                if( owns )
                    set->erase( key );
            }
        } guard{ &m_inProgressLoads, {}, false };
 
        bool cycle = false;
 
        if( symbolId.IsValid() )
        {
            guard.key = symbolId.Format().wx_str();
            guard.owns = m_inProgressLoads.insert( guard.key ).second;
            cycle = !guard.owns;
 
            if( cycle )
            {
                wxLogTrace( traceDatabase,
                            wxT( "loadSymbolFromRow: cycle detected resolving '%s' "
                                 "(row '%s' in table '%s'); skipping recursive load" ),
                            symbolIdStr, aSymbolName, aTable.name );
            }
            else
            {
                originalSymbol = m_adapter->LoadSymbol( symbolId );
            }
        }
 
        if( originalSymbol )
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: found original symbol '%s'" ),
                        symbolIdStr );
            symbol.reset( originalSymbol->Duplicate() );
            symbol->SetSourceLibId( symbolId );
        }
        else if( cycle )
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: source symbol '%s' is a "
                                            "self-reference, will create empty symbol" ),
                        symbolIdStr );
        }
        else if( !symbolId.IsValid() )
        {
            wxLogTrace( traceDatabase, wxT( "loadSymboFromRow: source symbol id '%s' is invalid, "
                                            "will create empty symbol" ), symbolIdStr );
        }
        else
        {
            wxLogTrace( traceDatabase, wxT( "loadSymboFromRow: source symbol '%s' not found, "
                                            "will create empty symbol" ), symbolIdStr );
        }
    }
 
    if( !symbol )
    {
        // Actual symbol not found: return metadata only; error will be indicated in the
        // symbol chooser
        symbol.reset( new LIB_SYMBOL( aSymbolName ) );
    }
    else
    {
        symbol->SetName( aSymbolName );
    }
 
    LIB_ID libId = symbol->GetLibId();
    libId.SetSubLibraryName( aTable.name );;
    symbol->SetLibId( libId );
    wxArrayString footprintsList;
 
    if( aRow.count( aTable.footprints_col ) )
    {
        std::string footprints = std::any_cast<std::string>( aRow.at( aTable.footprints_col ) );
 
        wxString footprintsStr = wxString( footprints.c_str(), wxConvUTF8 );
        wxStringTokenizer tokenizer( footprintsStr, ";\t\r\n", wxTOKEN_STRTOK );
 
        while( tokenizer.HasMoreTokens() )
            footprintsList.Add( tokenizer.GetNextToken() );
 
        if( footprintsList.size() > 0 )
            symbol->GetFootprintField().SetText( footprintsList[0] );
    }
    else
    {
        wxLogTrace( traceDatabase, wxT( "loadSymboFromRow: footprint field %s not found." ),
                    aTable.footprints_col );
    }
 
    if( !aTable.properties.description.empty() && aRow.count( aTable.properties.description ) )
    {
        wxString value(
                std::any_cast<std::string>( aRow.at( aTable.properties.description ) ).c_str(),
                wxConvUTF8 );
        symbol->SetDescription( value );
    }
 
    if( !aTable.properties.keywords.empty() && aRow.count( aTable.properties.keywords ) )
    {
        wxString value( std::any_cast<std::string>( aRow.at( aTable.properties.keywords ) ).c_str(),
                        wxConvUTF8 );
        symbol->SetKeyWords( value );
    }
 
    if( !aTable.properties.footprint_filters.empty()
        && aRow.count( aTable.properties.footprint_filters ) )
    {
        wxString value( std::any_cast<std::string>( aRow.at( aTable.properties.footprint_filters ) )
                                .c_str(),
                        wxConvUTF8 );
        footprintsList.push_back( value );
    }
 
    symbol->SetFPFilters( footprintsList );
 
    if( !aTable.properties.exclude_from_sim.empty()
        && aRow.count( aTable.properties.exclude_from_sim ) )
    {
        std::optional<bool> val = boolFromAny( aRow.at( aTable.properties.exclude_from_sim ) );
 
        if( val )
        {
            symbol->SetExcludedFromSim( *val );
        }
        else
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: exclude_from_sim value for %s "
                                            "could not be cast to a boolean" ), aSymbolName );
        }
    }
 
    if( !aTable.properties.exclude_from_board.empty()
        && aRow.count( aTable.properties.exclude_from_board ) )
    {
        std::optional<bool> val = boolFromAny( aRow.at( aTable.properties.exclude_from_board ) );
 
        if( val )
        {
            symbol->SetExcludedFromBoard( *val );
        }
        else
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: exclude_from_board value for %s "
                                            "could not be cast to a boolean" ), aSymbolName );
        }
    }
 
    if( !aTable.properties.exclude_from_bom.empty()
        && aRow.count( aTable.properties.exclude_from_bom ) )
    {
        std::optional<bool> val = boolFromAny( aRow.at( aTable.properties.exclude_from_bom ) );
 
        if( val )
        {
            symbol->SetExcludedFromBOM( *val );
        }
        else
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: exclude_from_bom value for %s "
                                            "could not be cast to a boolean" ), aSymbolName );
        }
    }
 
    std::vector<SCH_FIELD*> fields;
    symbol->GetFields( fields );
 
    std::unordered_map<wxString, SCH_FIELD*> fieldsMap;
 
    for( SCH_FIELD* field : fields )
        fieldsMap[field->GetName()] = field;
 
    static const wxString c_valueFieldName( wxS( "Value" ) );
    static const wxString c_datasheetFieldName( wxS( "Datasheet" ) );
    static const wxString c_footprintFieldName( wxS( "Footprint" ) );
 
    // User fields produced from the database mapping must appear in the order they are
    // declared in the .kicad_dbl file, not in lexicographic order of their values. Start
    // assigning ordinals above whatever the source LIB_SYMBOL already uses so that any
    // pre-existing user fields keep their relative position before the database fields.
    int dbFieldOrdinal = symbol->GetNextFieldOrdinal();
 
    for( const DATABASE_FIELD_MAPPING& mapping : aTable.fields )
    {
        if( !aRow.count( mapping.column ) )
        {
            wxLogTrace( traceDatabase, wxT( "loadSymbolFromRow: field %s not found in result" ),
                        mapping.column );
            continue;
        }
 
        // Skip footprint field if it maps to the footprints column, since that column is
        // already processed above with tokenization for semicolon-separated multiple footprints.
        if( mapping.name_wx == c_footprintFieldName && mapping.column == aTable.footprints_col )
            continue;
 
        std::string strValue;
 
        try
        {
            strValue = std::any_cast<std::string>( aRow.at( mapping.column ) );
        }
        catch( std::bad_any_cast& )
        {
        }
 
        wxString value( strValue.c_str(), wxConvUTF8 );
 
        if( mapping.name_wx == c_valueFieldName )
        {
            SCH_FIELD& field = symbol->GetValueField();
            field.SetText( value );
 
            if( !mapping.inherit_properties )
            {
                field.SetVisible( mapping.visible_on_add );
                field.SetNameShown( mapping.show_name );
            }
            continue;
        }
        else if( mapping.name_wx == c_datasheetFieldName )
        {
            SCH_FIELD& field = symbol->GetDatasheetField();
            field.SetText( value );
 
            if( !mapping.inherit_properties )
            {
                field.SetVisible( mapping.visible_on_add );
                field.SetNameShown( mapping.show_name );
 
                if( mapping.visible_on_add )
                    field.SetAutoAdded( true );
            }
 
            continue;
        }
 
        SCH_FIELD* field;
        bool isNew = false;
 
        if( fieldsMap.count( mapping.name_wx ) )
        {
            field = fieldsMap[mapping.name_wx];
        }
        else
        {
            field = new SCH_FIELD( nullptr, FIELD_T::USER );
            field->SetName( mapping.name_wx );
            isNew = true;
            fieldsMap[mapping.name_wx] = field;
        }
 
        // Assign a sort-order ordinal so the property editor and BOM see the fields in the
        // order declared in the .kicad_dbl file. Without this, all USER fields share the
        // same FIELD_T::USER id and fall through to value-based comparison in operator<.
        // SetOrdinal forces m_id to FIELD_T::USER, so only apply it to non-mandatory fields
        // - a DB mapping that lands on a mandatory field by name (e.g. Reference or
        // Description) must keep its FIELD_T identity for downstream lookups.
        if( !field->IsMandatory() )
            field->SetOrdinal( dbFieldOrdinal++ );
 
        if( !mapping.inherit_properties || isNew )
        {
            field->SetVisible( mapping.visible_on_add );
            field->SetAutoAdded( true );
            field->SetNameShown( mapping.show_name );
        }
 
        field->SetText( value );
 
        if( isNew )
            symbol->AddDrawItem( field, false );
 
        m_customFields.insert( mapping.name_wx );
 
        if( mapping.visible_in_chooser )
            m_defaultShownFields.insert( mapping.name_wx );
    }
 
    symbol->GetDrawItems().sort();
 
    // Field mappings (including Description) are applied with SCH_FIELD::SetText, which does not
    // refresh the cached values the library tree and chooser read. Without this the upper chooser
    // panel keeps the source symbol's description while the details panel shows the database value.
    symbol->RefreshLibraryTreeCaches();
 
    return symbol;
}
 
 
DIALOG_SHIM* SCH_IO_DATABASE::CreateConfigurationDialog( wxWindow* aParent )
{
    return new DIALOG_DATABASE_LIB_SETTINGS( aParent, this );
}