kicad/common/database/database_connection.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2022 Jon Evans <jon@craftyjon.com>
* Copyright (C) 2022 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 <http://www.gnu.org/licenses/>.
*/
#include <boost/locale.hpp>
#include <fmt/core.h>
#include <nanodbc/nanodbc.h>
// Some outdated definitions are used in sql.h
// We need to define them for "recent" dev tools
#define INT64 int64_t
#define UINT64 uint64_t
#ifdef __MINGW32__
#define BYTE uint8_t
#define WORD uint16_t
#define DWORD uint32_t
#define HWND uint32_t /* dummy define */
#endif
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#ifdef WIN32
#include <windows.h> // for sql.h
#endif
#include <sql.h> // SQL_IDENTIFIER_QUOTE_CHAR
#include <wx/log.h>
#include <database/database_connection.h>
#include <database/database_cache.h>
const char* const traceDatabase = "KICAD_DATABASE";
/**
* When Unicode support is enabled in nanodbc, string formats are used matching the appropriate
* character set of the platform. KiCad uses UTF-8 encoded strings internally, but different
* platforms use different encodings for SQL strings. Unicode mode must be enabled for compilation
* on Windows, since Visual Studio forces the use of Unicode SQL headers if any part of the project
* has Unicode enabled.
*/
/**
* Converts a string from KiCad-native to nanodbc-native
* @param aString is a UTF-8 encoded string
* @return a string in nanodbc's platform-specific representation
*/
nanodbc::string fromUTF8( const std::string& aString )
{
return boost::locale::conv::utf_to_utf<nanodbc::string::value_type>( aString );
}
/**
* Converts a string from nanodbc-native to KiCad-native
* @param aString is a string encoded in nanodbc's platform-specific way
* @return a string with UTF-8 encoding
*/
std::string toUTF8( const nanodbc::string& aString )
{
return boost::locale::conv::utf_to_utf<char>( aString );
}
DATABASE_CONNECTION::DATABASE_CONNECTION( const std::string& aDataSourceName,
const std::string& aUsername,
const std::string& aPassword, int aTimeoutSeconds,
bool aConnectNow ) :
m_quoteChar( '"' )
{
m_dsn = aDataSourceName;
m_user = aUsername;
m_pass = aPassword;
m_timeout = aTimeoutSeconds;
m_cache = std::make_unique<DATABASE_CACHE>( 10, 1 );
if( aConnectNow )
Connect();
}
DATABASE_CONNECTION::DATABASE_CONNECTION( const std::string& aConnectionString,
int aTimeoutSeconds, bool aConnectNow ) :
m_quoteChar( '"' )
{
m_connectionString = aConnectionString;
m_timeout = aTimeoutSeconds;
m_cache = std::make_unique<DATABASE_CACHE>( 10, 1 );
if( aConnectNow )
Connect();
}
DATABASE_CONNECTION::~DATABASE_CONNECTION()
{
Disconnect();
m_conn.reset();
}
void DATABASE_CONNECTION::SetCacheParams( int aMaxSize, int aMaxAge )
{
if( !m_cache )
return;
if( aMaxSize < 0 )
aMaxSize = 0;
if( aMaxAge < 0 )
aMaxAge = 0;
m_cache->SetMaxSize( static_cast<size_t>( aMaxSize ) );
m_cache->SetMaxAge( static_cast<time_t>( aMaxAge ) );
}
bool DATABASE_CONNECTION::Connect()
{
nanodbc::string dsn = fromUTF8( m_dsn );
nanodbc::string user = fromUTF8( m_user );
nanodbc::string pass = fromUTF8( m_pass );
nanodbc::string cs = fromUTF8( m_connectionString );
try
{
if( cs.empty() )
{
wxLogTrace( traceDatabase, wxT( "Creating connection to DSN %s" ), m_dsn );
m_conn = std::make_unique<nanodbc::connection>( dsn, user, pass, m_timeout );
}
else
{
wxLogTrace( traceDatabase, wxT( "Creating connection with connection string" ) );
m_conn = std::make_unique<nanodbc::connection>( cs, m_timeout );
}
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
return false;
}
if( IsConnected() )
{
syncTables();
cacheColumns();
getQuoteChar();
}
return IsConnected();
}
bool DATABASE_CONNECTION::Disconnect()
{
if( !m_conn )
{
wxLogTrace( traceDatabase, wxT( "Note: Disconnect() called without valid connection" ) );
return false;
}
m_conn->disconnect();
return !m_conn->connected();
}
bool DATABASE_CONNECTION::IsConnected() const
{
if( !m_conn )
return false;
return m_conn->connected();
}
bool DATABASE_CONNECTION::syncTables()
{
if( !m_conn )
return false;
m_tables.clear();
try
{
nanodbc::catalog catalog( *m_conn );
nanodbc::catalog::tables tables = catalog.find_tables();
while( tables.next() )
{
std::string key = toUTF8( tables.table_name() );
m_tables[key] = toUTF8( tables.table_type() );
}
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while syncing tables: %s" ), m_lastError );
return false;
}
return true;
}
bool DATABASE_CONNECTION::cacheColumns()
{
if( !m_conn )
return false;
m_columnCache.clear();
for( const auto& tableIter : m_tables )
{
try
{
nanodbc::catalog catalog( *m_conn );
nanodbc::catalog::columns columns =
catalog.find_columns( NANODBC_TEXT( "" ), fromUTF8( tableIter.first ) );
while( columns.next() )
{
std::string columnKey = toUTF8( columns.column_name() );
m_columnCache[tableIter.first][columnKey] = columns.data_type();
}
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while syncing columns for table %s: %s" ),
tableIter.first, m_lastError );
return false;
}
}
return true;
}
bool DATABASE_CONNECTION::getQuoteChar()
{
if( !m_conn )
return false;
try
{
nanodbc::string qc = m_conn->get_info<nanodbc::string>( SQL_IDENTIFIER_QUOTE_CHAR );
if( qc.empty() )
return false;
m_quoteChar = *toUTF8( qc ).begin();
wxLogTrace( traceDatabase, wxT( "Quote char retrieved: %c" ), m_quoteChar );
}
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catch( nanodbc::database_error& )
{
wxLogTrace( traceDatabase, wxT( "Exception while querying quote char: %s" ), m_lastError );
return false;
}
return true;
}
bool DATABASE_CONNECTION::SelectOne( const std::string& aTable,
const std::pair<std::string, std::string>& aWhere,
DATABASE_CONNECTION::ROW& aResult )
{
if( !m_conn )
{
wxLogTrace( traceDatabase, wxT( "Called SelectOne without valid connection!" ) );
return false;
}
auto tableMapIter = m_tables.find( aTable );
if( tableMapIter == m_tables.end() )
{
wxLogTrace( traceDatabase, wxT( "SelectOne: requested table %s not found in cache" ),
aTable );
return false;
}
const std::string& tableName = tableMapIter->first;
if( !m_columnCache.count( tableName ) )
{
wxLogTrace( traceDatabase, wxT( "SelectOne: requested table %s missing from column cache" ),
tableName );
return false;
}
auto columnCacheIter = m_columnCache.at( tableName ).find( aWhere.first );
if( columnCacheIter == m_columnCache.at( tableName ).end() )
{
wxLogTrace( traceDatabase, wxT( "SelectOne: requested column %s not found in cache for %s" ),
aWhere.first, tableName );
return false;
}
const std::string& columnName = columnCacheIter->first;
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std::string cacheKey = fmt::format( "{}{}{}", tableName, columnName, aWhere.second );
std::string queryStr = fmt::format( "SELECT * FROM {}{}{} WHERE {}{}{} = ?",
m_quoteChar, tableName, m_quoteChar,
m_quoteChar, columnName, m_quoteChar );
nanodbc::statement statement( *m_conn );
nanodbc::string query = fromUTF8( queryStr );
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if( m_cache->Get( cacheKey, aResult ) )
{
wxLogTrace( traceDatabase, wxT( "SelectOne: `%s` with parameter `%s` - cache hit" ),
toUTF8( query ), aWhere.second );
return true;
}
try
{
statement.prepare( query );
statement.bind( 0, aWhere.second.c_str() );
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while preparing statement for SelectOne: %s" ),
m_lastError );
return false;
}
wxLogTrace( traceDatabase, wxT( "SelectOne: `%s` with parameter `%s`" ), toUTF8( query ),
aWhere.second );
nanodbc::result results;
try
{
results = nanodbc::execute( statement );
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while executing statement for SelectOne: %s" ),
m_lastError );
return false;
}
if( !results.first() )
{
wxLogTrace( traceDatabase, wxT( "SelectOne: no results returned from query" ) );
return false;
}
wxLogTrace( traceDatabase, wxT( "SelectOne: %ld results returned from query" ),
results.rows() );
aResult.clear();
try
{
for( short i = 0; i < results.columns(); ++i )
{
std::string column = toUTF8( results.column_name( i ) );
aResult[ column ] = toUTF8( results.get<nanodbc::string>( i, NANODBC_TEXT( "" ) ) );
}
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while parsing results from SelectOne: %s" ),
m_lastError );
return false;
}
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m_cache->Put( cacheKey, aResult );
return true;
}
bool DATABASE_CONNECTION::SelectAll( const std::string& aTable, std::vector<ROW>& aResults )
{
if( !m_conn )
{
wxLogTrace( traceDatabase, wxT( "Called SelectAll without valid connection!" ) );
return false;
}
auto tableMapIter = m_tables.find( aTable );
if( tableMapIter == m_tables.end() )
{
wxLogTrace( traceDatabase, wxT( "SelectAll: requested table %s not found in cache" ),
aTable );
return false;
}
nanodbc::statement statement( *m_conn );
nanodbc::string query = fromUTF8( fmt::format( "SELECT * FROM {}{}{}", m_quoteChar,
tableMapIter->first, m_quoteChar ) );
wxLogTrace( traceDatabase, wxT( "SelectAll: `%s`" ), toUTF8( query ) );
try
{
statement.prepare( query );
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while preparing query for SelectAll: %s" ),
m_lastError );
return false;
}
nanodbc::result results;
try
{
results = nanodbc::execute( statement );
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while executing query for SelectAll: %s" ),
m_lastError );
return false;
}
try
{
while( results.next() )
{
ROW result;
for( short j = 0; j < results.columns(); ++j )
{
std::string column = toUTF8( results.column_name( j ) );
result[column] = toUTF8( results.get<nanodbc::string>( j, NANODBC_TEXT( "" ) ) );
}
aResults.emplace_back( std::move( result ) );
}
}
catch( nanodbc::database_error& e )
{
m_lastError = e.what();
wxLogTrace( traceDatabase, wxT( "Exception while parsing results from SelectAll: %s" ),
m_lastError );
return false;
}
return true;
}