]> git.openstreetmap.org Git - nominatim.git/blobdiff - lib/setup/SetupClass.php
projects / nominatim.git / blobdiff
? search:
summary | shortlog | log | commit | commitdiff | tree
raw | inline | side by side
Merge pull request #1769 from lonvia/display-name-order
[nominatim.git] / lib / setup / SetupClass.php
diff --git a/lib/setup/SetupClass.php b/lib/setup/SetupClass.php
index 9cc00a5f021e9830cd2f2604a0857843277a904a..385eff70eb6cda7160cb84f7a6b5c5ff0c96b08e 100755 (executable)
--- a/lib/setup/SetupClass.php
+++ b/lib/setup/SetupClass.php
@@ -3,6 +3,7 @@
 namespace Nominatim\Setup;
 
 require_once(CONST_BasePath.'/lib/setup/AddressLevelParser.php');
 namespace Nominatim\Setup;
 
 require_once(CONST_BasePath.'/lib/setup/AddressLevelParser.php');
+require_once(CONST_BasePath.'/lib/Shell.php');
 
 class SetupFunctions
 {
 
 class SetupFunctions
 {
@@ -10,11 +11,13 @@ class SetupFunctions
     protected $iInstances;
     protected $sModulePath;
     protected $aDSNInfo;
     protected $iInstances;
     protected $sModulePath;
     protected $aDSNInfo;
+    protected $bQuiet;
     protected $bVerbose;
     protected $sIgnoreErrors;
     protected $bEnableDiffUpdates;
     protected $bEnableDebugStatements;
     protected $bNoPartitions;
     protected $bVerbose;
     protected $sIgnoreErrors;
     protected $bEnableDiffUpdates;
     protected $bEnableDebugStatements;
     protected $bNoPartitions;
+    protected $bDrop;
     protected $oDB = null;
 
     public function __construct(array $aCMDResult)
     protected $oDB = null;
 
     public function __construct(array $aCMDResult)
@@ -29,10 +32,13 @@ class SetupFunctions
             warn('resetting threads to '.$this->iInstances);
         }
 
             warn('resetting threads to '.$this->iInstances);
         }
 
-        // Assume we can steal all the cache memory in the box (unless told otherwise)
         if (isset($aCMDResult['osm2pgsql-cache'])) {
             $this->iCacheMemory = $aCMDResult['osm2pgsql-cache'];
         if (isset($aCMDResult['osm2pgsql-cache'])) {
             $this->iCacheMemory = $aCMDResult['osm2pgsql-cache'];
+        } elseif (!is_null(CONST_Osm2pgsql_Flatnode_File)) {
+            // When flatnode files are enabled then disable cache per default.
+            $this->iCacheMemory = 0;
         } else {
         } else {
+            // Otherwise: Assume we can steal all the cache memory in the box.
             $this->iCacheMemory = getCacheMemoryMB();
         }
 
             $this->iCacheMemory = getCacheMemoryMB();
         }
 
@@ -46,6 +52,7 @@ class SetupFunctions
         }
 
         // setting member variables based on command line options stored in $aCMDResult
         }
 
         // setting member variables based on command line options stored in $aCMDResult
+        $this->bQuiet = isset($aCMDResult['quiet']) && $aCMDResult['quiet'];
         $this->bVerbose = $aCMDResult['verbose'];
 
         //setting default values which are not set by the update.php array
         $this->bVerbose = $aCMDResult['verbose'];
 
         //setting default values which are not set by the update.php array
@@ -69,34 +76,36 @@ class SetupFunctions
         } else {
             $this->bEnableDiffUpdates = false;
         }
         } else {
             $this->bEnableDiffUpdates = false;
         }
+
+        $this->bDrop = isset($aCMDResult['drop']) && $aCMDResult['drop'];
     }
 
     public function createDB()
     {
         info('Create DB');
     }
 
     public function createDB()
     {
         info('Create DB');
-        $bExists = true;
-        try {
-            $oDB = new \Nominatim\DB;
-            $oDB->connect();
-        } catch (\Nominatim\DatabaseError $e) {
-            $bExists = false;
-        }
+        $oDB = new \Nominatim\DB;
 
 
-        if ($bExists) {
+        if ($oDB->checkConnection()) {
             fail('database already exists ('.CONST_Database_DSN.')');
         }
 
             fail('database already exists ('.CONST_Database_DSN.')');
         }
 
-        $sCreateDBCmd = 'createdb -E UTF-8 -p '.$this->aDSNInfo['port'].' '.$this->aDSNInfo['database'];
+        $oCmd = (new \Nominatim\Shell('createdb'))
+                ->addParams('-E', 'UTF-8')
+                ->addParams('-p', $this->aDSNInfo['port']);
+
         if (isset($this->aDSNInfo['username'])) {
         if (isset($this->aDSNInfo['username'])) {
-            $sCreateDBCmd .= ' -U '.$this->aDSNInfo['username'];
+            $oCmd->addParams('-U', $this->aDSNInfo['username']);
+        }
+        if (isset($this->aDSNInfo['password'])) {
+            $oCmd->addEnvPair('PGPASSWORD', $this->aDSNInfo['password']);
         }
         }
-
         if (isset($this->aDSNInfo['hostspec'])) {
         if (isset($this->aDSNInfo['hostspec'])) {
-            $sCreateDBCmd .= ' -h '.$this->aDSNInfo['hostspec'];
+            $oCmd->addParams('-h', $this->aDSNInfo['hostspec']);
         }
         }
+        $oCmd->addParams($this->aDSNInfo['database']);
 
 
-        $result = $this->runWithPgEnv($sCreateDBCmd);
-        if ($result != 0) fail('Error executing external command: '.$sCreateDBCmd);
+        $result = $oCmd->run();
+        if ($result != 0) fail('Error executing external command: '.$oCmd->escapedCmd());
     }
 
     public function connect()
     }
 
     public function connect()
@@ -112,37 +121,22 @@ class SetupFunctions
         $fPostgresVersion = $this->oDB->getPostgresVersion();
         echo 'Postgres version found: '.$fPostgresVersion."\n";
 
         $fPostgresVersion = $this->oDB->getPostgresVersion();
         echo 'Postgres version found: '.$fPostgresVersion."\n";
 
-        if ($fPostgresVersion < 9.01) {
-            fail('Minimum supported version of Postgresql is 9.1.');
+        if ($fPostgresVersion < 9.03) {
+            fail('Minimum supported version of Postgresql is 9.3.');
         }
 
         $this->pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS hstore');
         $this->pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS postgis');
 
         }
 
         $this->pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS hstore');
         $this->pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS postgis');
 
-        // For extratags and namedetails the hstore_to_json converter is
-        // needed which is only available from Postgresql 9.3+. For older
-        // versions add a dummy function that returns nothing.
-        $iNumFunc = chksql($this->oDB->getOne("select count(*) from pg_proc where proname = 'hstore_to_json'"));
-
-        if ($iNumFunc == 0) {
-            $this->pgsqlRunScript("create function hstore_to_json(dummy hstore) returns text AS 'select null::text' language sql immutable");
-            warn('Postgresql is too old. extratags and namedetails API not available.');
-        }
-
-
         $fPostgisVersion = $this->oDB->getPostgisVersion();
         echo 'Postgis version found: '.$fPostgisVersion."\n";
 
         $fPostgisVersion = $this->oDB->getPostgisVersion();
         echo 'Postgis version found: '.$fPostgisVersion."\n";
 
-        if ($fPostgisVersion < 2.1) {
-            // Functions were renamed in 2.1 and throw an annoying deprecation warning
-            $this->pgsqlRunScript('ALTER FUNCTION st_line_interpolate_point(geometry, double precision) RENAME TO ST_LineInterpolatePoint');
-            $this->pgsqlRunScript('ALTER FUNCTION ST_Line_Locate_Point(geometry, geometry) RENAME TO ST_LineLocatePoint');
-        }
         if ($fPostgisVersion < 2.2) {
         if ($fPostgisVersion < 2.2) {
-            $this->pgsqlRunScript('ALTER FUNCTION ST_Distance_Spheroid(geometry, geometry, spheroid) RENAME TO ST_DistanceSpheroid');
+            echo "Minimum required Postgis version 2.2\n";
+            exit(1);
         }
 
         }
 
-        $i = chksql($this->oDB->getOne("select count(*) from pg_user where usename = '".CONST_Database_Web_User."'"));
+        $i = $this->oDB->getOne("select count(*) from pg_user where usename = '".CONST_Database_Web_User."'");
         if ($i == 0) {
             echo "\nERROR: Web user '".CONST_Database_Web_User."' does not exist. Create it with:\n";
             echo "\n          createuser ".CONST_Database_Web_User."\n\n";
         if ($i == 0) {
             echo "\nERROR: Web user '".CONST_Database_Web_User."' does not exist. Create it with:\n";
             echo "\n          createuser ".CONST_Database_Web_User."\n\n";
@@ -150,9 +144,7 @@ class SetupFunctions
         }
 
         // Try accessing the C module, so we know early if something is wrong
         }
 
         // Try accessing the C module, so we know early if something is wrong
-        if (!checkModulePresence()) {
-            fail('error loading nominatim.so module');
-        }
+        checkModulePresence(); // raises exception on failure
 
         if (!file_exists(CONST_ExtraDataPath.'/country_osm_grid.sql.gz')) {
             echo 'Error: you need to download the country_osm_grid first:';
 
         if (!file_exists(CONST_ExtraDataPath.'/country_osm_grid.sql.gz')) {
             echo 'Error: you need to download the country_osm_grid first:';
@@ -160,84 +152,94 @@ class SetupFunctions
             exit(1);
         }
         $this->pgsqlRunScriptFile(CONST_BasePath.'/data/country_name.sql');
             exit(1);
         }
         $this->pgsqlRunScriptFile(CONST_BasePath.'/data/country_name.sql');
-        $this->pgsqlRunScriptFile(CONST_BasePath.'/data/country_osm_grid.sql.gz');
+        $this->pgsqlRunScriptFile(CONST_ExtraDataPath.'/country_osm_grid.sql.gz');
         $this->pgsqlRunScriptFile(CONST_BasePath.'/data/gb_postcode_table.sql');
         $this->pgsqlRunScriptFile(CONST_BasePath.'/data/gb_postcode_table.sql');
+        $this->pgsqlRunScriptFile(CONST_BasePath.'/data/us_postcode_table.sql');
 
         $sPostcodeFilename = CONST_BasePath.'/data/gb_postcode_data.sql.gz';
         if (file_exists($sPostcodeFilename)) {
             $this->pgsqlRunScriptFile($sPostcodeFilename);
         } else {
 
         $sPostcodeFilename = CONST_BasePath.'/data/gb_postcode_data.sql.gz';
         if (file_exists($sPostcodeFilename)) {
             $this->pgsqlRunScriptFile($sPostcodeFilename);
         } else {
-            warn('optional external UK postcode table file ('.$sPostcodeFilename.') not found. Skipping.');
+            warn('optional external GB postcode table file ('.$sPostcodeFilename.') not found. Skipping.');
         }
 
         }
 
-        if (CONST_Use_Extra_US_Postcodes) {
-            $this->pgsqlRunScriptFile(CONST_BasePath.'/data/us_postcode.sql');
+        $sPostcodeFilename = CONST_BasePath.'/data/us_postcode_data.sql.gz';
+        if (file_exists($sPostcodeFilename)) {
+            $this->pgsqlRunScriptFile($sPostcodeFilename);
+        } else {
+            warn('optional external US postcode table file ('.$sPostcodeFilename.') not found. Skipping.');
         }
 
         if ($this->bNoPartitions) {
             $this->pgsqlRunScript('update country_name set partition = 0');
         }
         }
 
         if ($this->bNoPartitions) {
             $this->pgsqlRunScript('update country_name set partition = 0');
         }
-
-        // the following will be needed by createFunctions later but
-        // is only defined in the subsequently called createTables
-        // Create dummies here that will be overwritten by the proper
-        // versions in create-tables.
-        $this->pgsqlRunScript('CREATE TABLE IF NOT EXISTS place_boundingbox ()');
-        $this->pgsqlRunScript('CREATE TYPE wikipedia_article_match AS ()', false);
     }
 
     public function importData($sOSMFile)
     {
         info('Import data');
 
     }
 
     public function importData($sOSMFile)
     {
         info('Import data');
 
-        $osm2pgsql = CONST_Osm2pgsql_Binary;
-        if (!file_exists($osm2pgsql)) {
+        if (!file_exists(CONST_Osm2pgsql_Binary)) {
             echo "Check CONST_Osm2pgsql_Binary in your local settings file.\n";
             echo "Normally you should not need to set this manually.\n";
             echo "Check CONST_Osm2pgsql_Binary in your local settings file.\n";
             echo "Normally you should not need to set this manually.\n";
-            fail("osm2pgsql not found in '$osm2pgsql'");
+            fail("osm2pgsql not found in '".CONST_Osm2pgsql_Binary."'");
         }
 
         }
 
-        $osm2pgsql .= ' -S '.CONST_Import_Style;
+        $oCmd = new \Nominatim\Shell(CONST_Osm2pgsql_Binary);
+        $oCmd->addParams('--style', CONST_Import_Style);
 
         if (!is_null(CONST_Osm2pgsql_Flatnode_File) && CONST_Osm2pgsql_Flatnode_File) {
 
         if (!is_null(CONST_Osm2pgsql_Flatnode_File) && CONST_Osm2pgsql_Flatnode_File) {
-            $osm2pgsql .= ' --flat-nodes '.CONST_Osm2pgsql_Flatnode_File;
-        }
-
-        if (CONST_Tablespace_Osm2pgsql_Data)
-            $osm2pgsql .= ' --tablespace-slim-data '.CONST_Tablespace_Osm2pgsql_Data;
-        if (CONST_Tablespace_Osm2pgsql_Index)
-            $osm2pgsql .= ' --tablespace-slim-index '.CONST_Tablespace_Osm2pgsql_Index;
-        if (CONST_Tablespace_Place_Data)
-            $osm2pgsql .= ' --tablespace-main-data '.CONST_Tablespace_Place_Data;
-        if (CONST_Tablespace_Place_Index)
-            $osm2pgsql .= ' --tablespace-main-index '.CONST_Tablespace_Place_Index;
-        $osm2pgsql .= ' -lsc -O gazetteer --hstore --number-processes 1';
-        $osm2pgsql .= ' -C '.$this->iCacheMemory;
-        $osm2pgsql .= ' -P '.$this->aDSNInfo['port'];
+            $oCmd->addParams('--flat-nodes', CONST_Osm2pgsql_Flatnode_File);
+        }
+        if (CONST_Tablespace_Osm2pgsql_Data) {
+            $oCmd->addParams('--tablespace-slim-data', CONST_Tablespace_Osm2pgsql_Data);
+        }
+        if (CONST_Tablespace_Osm2pgsql_Index) {
+            $oCmd->addParams('--tablespace-slim-index', CONST_Tablespace_Osm2pgsql_Index);
+        }
+        if (CONST_Tablespace_Place_Data) {
+            $oCmd->addParams('--tablespace-main-data', CONST_Tablespace_Place_Data);
+        }
+        if (CONST_Tablespace_Place_Index) {
+            $oCmd->addParams('--tablespace-main-index', CONST_Tablespace_Place_Index);
+        }
+        $oCmd->addParams('--latlong', '--slim', '--create');
+        $oCmd->addParams('--output', 'gazetteer');
+        $oCmd->addParams('--hstore');
+        $oCmd->addParams('--number-processes', 1);
+        $oCmd->addParams('--cache', $this->iCacheMemory);
+        $oCmd->addParams('--port', $this->aDSNInfo['port']);
+
         if (isset($this->aDSNInfo['username'])) {
         if (isset($this->aDSNInfo['username'])) {
-            $osm2pgsql .= ' -U '.$this->aDSNInfo['username'];
+            $oCmd->addParams('--username', $this->aDSNInfo['username']);
+        }
+        if (isset($this->aDSNInfo['password'])) {
+            $oCmd->addEnvPair('PGPASSWORD', $this->aDSNInfo['password']);
         }
         if (isset($this->aDSNInfo['hostspec'])) {
         }
         if (isset($this->aDSNInfo['hostspec'])) {
-            $osm2pgsql .= ' -H '.$this->aDSNInfo['hostspec'];
+            $oCmd->addParams('--host', $this->aDSNInfo['hostspec']);
         }
         }
-        $osm2pgsql .= ' -d '.$this->aDSNInfo['database'].' '.$sOSMFile;
+        $oCmd->addParams('--database', $this->aDSNInfo['database']);
+        $oCmd->addParams($sOSMFile);
+        $oCmd->run();
 
 
-        $this->runWithPgEnv($osm2pgsql);
-
-        if (!$this->sIgnoreErrors && !chksql($this->oDB->getRow('select * from place limit 1'))) {
+        if (!$this->sIgnoreErrors && !$this->oDB->getRow('select * from place limit 1')) {
             fail('No Data');
         }
             fail('No Data');
         }
+
+        if ($this->bDrop) {
+            $this->dropTable('planet_osm_nodes');
+            $this->removeFlatnodeFile();
+        }
     }
 
     public function createFunctions()
     {
         info('Create Functions');
 
     }
 
     public function createFunctions()
     {
         info('Create Functions');
 
-        // Try accessing the C module, so we know eif something is wrong
-        // update.php calls this function
-        if (!checkModulePresence()) {
-            fail('error loading nominatim.so module');
-        }
+        // Try accessing the C module, so we know early if something is wrong
+        checkModulePresence(); // raises exception on failure
+
         $this->createSqlFunctions();
     }
 
         $this->createSqlFunctions();
     }
 
@@ -246,88 +248,34 @@ class SetupFunctions
         info('Create Tables');
 
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tables.sql');
         info('Create Tables');
 
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tables.sql');
-        $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
-        $sTemplate = $this->replaceTablespace(
-            '{ts:address-data}',
-            CONST_Tablespace_Address_Data,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:address-index}',
-            CONST_Tablespace_Address_Index,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:search-data}',
-            CONST_Tablespace_Search_Data,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:search-index}',
-            CONST_Tablespace_Search_Index,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-data}',
-            CONST_Tablespace_Aux_Data,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-index}',
-            CONST_Tablespace_Aux_Index,
-            $sTemplate
-        );
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
 
         $this->pgsqlRunScript($sTemplate, false);
 
         if ($bReverseOnly) {
 
         $this->pgsqlRunScript($sTemplate, false);
 
         if ($bReverseOnly) {
-            $this->pgExec('DROP TABLE search_name');
+            $this->dropTable('search_name');
         }
 
         $oAlParser = new AddressLevelParser(CONST_Address_Level_Config);
         $oAlParser->createTable($this->oDB, 'address_levels');
     }
 
         }
 
         $oAlParser = new AddressLevelParser(CONST_Address_Level_Config);
         $oAlParser->createTable($this->oDB, 'address_levels');
     }
 
-    public function createPartitionTables()
+    public function createTableTriggers()
     {
     {
-        info('Create Partition Tables');
-
-        $sTemplate = file_get_contents(CONST_BasePath.'/sql/partition-tables.src.sql');
-        $sTemplate = $this->replaceTablespace(
-            '{ts:address-data}',
-            CONST_Tablespace_Address_Data,
-            $sTemplate
-        );
-
-        $sTemplate = $this->replaceTablespace(
-            '{ts:address-index}',
-            CONST_Tablespace_Address_Index,
-            $sTemplate
-        );
+        info('Create Tables');
 
 
-        $sTemplate = $this->replaceTablespace(
-            '{ts:search-data}',
-            CONST_Tablespace_Search_Data,
-            $sTemplate
-        );
+        $sTemplate = file_get_contents(CONST_BasePath.'/sql/table-triggers.sql');
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
 
 
-        $sTemplate = $this->replaceTablespace(
-            '{ts:search-index}',
-            CONST_Tablespace_Search_Index,
-            $sTemplate
-        );
+        $this->pgsqlRunScript($sTemplate, false);
+    }
 
 
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-data}',
-            CONST_Tablespace_Aux_Data,
-            $sTemplate
-        );
+    public function createPartitionTables()
+    {
+        info('Create Partition Tables');
 
 
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-index}',
-            CONST_Tablespace_Aux_Index,
-            $sTemplate
-        );
+        $sTemplate = file_get_contents(CONST_BasePath.'/sql/partition-tables.src.sql');
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
 
         $this->pgsqlRunPartitionScript($sTemplate);
     }
 
         $this->pgsqlRunPartitionScript($sTemplate);
     }
@@ -342,19 +290,14 @@ class SetupFunctions
 
     public function importWikipediaArticles()
     {
 
     public function importWikipediaArticles()
     {
-        $sWikiArticlesFile = CONST_Wikipedia_Data_Path.'/wikipedia_article.sql.bin';
-        $sWikiRedirectsFile = CONST_Wikipedia_Data_Path.'/wikipedia_redirect.sql.bin';
+        $sWikiArticlesFile = CONST_Wikipedia_Data_Path.'/wikimedia-importance.sql.gz';
         if (file_exists($sWikiArticlesFile)) {
         if (file_exists($sWikiArticlesFile)) {
-            info('Importing wikipedia articles');
-            $this->pgsqlRunDropAndRestore($sWikiArticlesFile);
-        } else {
-            warn('wikipedia article dump file not found - places will have default importance');
-        }
-        if (file_exists($sWikiRedirectsFile)) {
-            info('Importing wikipedia redirects');
-            $this->pgsqlRunDropAndRestore($sWikiRedirectsFile);
+            info('Importing wikipedia articles and redirects');
+            $this->dropTable('wikipedia_article');
+            $this->dropTable('wikipedia_redirect');
+            $this->pgsqlRunScriptFile($sWikiArticlesFile);
         } else {
         } else {
-            warn('wikipedia redirect dump file not found - some place importance values may be missing');
+            warn('wikipedia importance dump file not found - places will have default importance');
         }
     }
 
         }
     }
 
@@ -362,42 +305,40 @@ class SetupFunctions
     {
         info('Drop old Data');
 
     {
         info('Drop old Data');
 
-        $this->pgExec('TRUNCATE word');
+        $this->oDB->exec('TRUNCATE word');
         echo '.';
         echo '.';
-        $this->pgExec('TRUNCATE placex');
+        $this->oDB->exec('TRUNCATE placex');
         echo '.';
         echo '.';
-        $this->pgExec('TRUNCATE location_property_osmline');
+        $this->oDB->exec('TRUNCATE location_property_osmline');
         echo '.';
         echo '.';
-        $this->pgExec('TRUNCATE place_addressline');
+        $this->oDB->exec('TRUNCATE place_addressline');
         echo '.';
         echo '.';
-        $this->pgExec('TRUNCATE place_boundingbox');
-        echo '.';
-        $this->pgExec('TRUNCATE location_area');
+        $this->oDB->exec('TRUNCATE location_area');
         echo '.';
         if (!$this->dbReverseOnly()) {
         echo '.';
         if (!$this->dbReverseOnly()) {
-            $this->pgExec('TRUNCATE search_name');
+            $this->oDB->exec('TRUNCATE search_name');
             echo '.';
         }
             echo '.';
         }
-        $this->pgExec('TRUNCATE search_name_blank');
+        $this->oDB->exec('TRUNCATE search_name_blank');
         echo '.';
         echo '.';
-        $this->pgExec('DROP SEQUENCE seq_place');
+        $this->oDB->exec('DROP SEQUENCE seq_place');
         echo '.';
         echo '.';
-        $this->pgExec('CREATE SEQUENCE seq_place start 100000');
+        $this->oDB->exec('CREATE SEQUENCE seq_place start 100000');
         echo '.';
 
         $sSQL = 'select distinct partition from country_name';
         echo '.';
 
         $sSQL = 'select distinct partition from country_name';
-        $aPartitions = chksql($this->oDB->getCol($sSQL));
+        $aPartitions = $this->oDB->getCol($sSQL);
 
         if (!$this->bNoPartitions) $aPartitions[] = 0;
         foreach ($aPartitions as $sPartition) {
 
         if (!$this->bNoPartitions) $aPartitions[] = 0;
         foreach ($aPartitions as $sPartition) {
-            $this->pgExec('TRUNCATE location_road_'.$sPartition);
+            $this->oDB->exec('TRUNCATE location_road_'.$sPartition);
             echo '.';
         }
 
         // used by getorcreate_word_id to ignore frequent partial words
         $sSQL = 'CREATE OR REPLACE FUNCTION get_maxwordfreq() RETURNS integer AS ';
         $sSQL .= '$$ SELECT '.CONST_Max_Word_Frequency.' as maxwordfreq; $$ LANGUAGE SQL IMMUTABLE';
             echo '.';
         }
 
         // used by getorcreate_word_id to ignore frequent partial words
         $sSQL = 'CREATE OR REPLACE FUNCTION get_maxwordfreq() RETURNS integer AS ';
         $sSQL .= '$$ SELECT '.CONST_Max_Word_Frequency.' as maxwordfreq; $$ LANGUAGE SQL IMMUTABLE';
-        $this->pgExec($sSQL);
+        $this->oDB->exec($sSQL);
         echo ".\n";
 
         // pre-create the word list
         echo ".\n";
 
         // pre-create the word list
@@ -489,18 +430,15 @@ class SetupFunctions
     {
         info('Import Tiger data');
 
     {
         info('Import Tiger data');
 
+        $aFilenames = glob(CONST_Tiger_Data_Path.'/*.sql');
+        info('Found '.count($aFilenames).' SQL files in path '.CONST_Tiger_Data_Path);
+        if (empty($aFilenames)) {
+            warn('Tiger data import selected but no files found in path '.CONST_Tiger_Data_Path);
+            return;
+        }
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_start.sql');
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_start.sql');
-        $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-data}',
-            CONST_Tablespace_Aux_Data,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-index}',
-            CONST_Tablespace_Aux_Index,
-            $sTemplate
-        );
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
+
         $this->pgsqlRunScript($sTemplate, false);
 
         $aDBInstances = array();
         $this->pgsqlRunScript($sTemplate, false);
 
         $aDBInstances = array();
@@ -513,7 +451,7 @@ class SetupFunctions
             pg_ping($aDBInstances[$i]);
         }
 
             pg_ping($aDBInstances[$i]);
         }
 
-        foreach (glob(CONST_Tiger_Data_Path.'/*.sql') as $sFile) {
+        foreach ($aFilenames as $sFile) {
             echo $sFile.': ';
             $hFile = fopen($sFile, 'r');
             $sSQL = fgets($hFile, 100000);
             echo $sFile.': ';
             $hFile = fopen($sFile, 'r');
             $sSQL = fgets($hFile, 100000);
@@ -553,24 +491,15 @@ class SetupFunctions
 
         info('Creating indexes on Tiger data');
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_finish.sql');
 
         info('Creating indexes on Tiger data');
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_finish.sql');
-        $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-data}',
-            CONST_Tablespace_Aux_Data,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-index}',
-            CONST_Tablespace_Aux_Index,
-            $sTemplate
-        );
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
+
         $this->pgsqlRunScript($sTemplate, false);
     }
 
     public function calculatePostcodes($bCMDResultAll)
     {
         info('Calculate Postcodes');
         $this->pgsqlRunScript($sTemplate, false);
     }
 
     public function calculatePostcodes($bCMDResultAll)
     {
         info('Calculate Postcodes');
-        $this->pgExec('TRUNCATE location_postcode');
+        $this->oDB->exec('TRUNCATE location_postcode');
 
         $sSQL  = 'INSERT INTO location_postcode';
         $sSQL .= ' (place_id, indexed_status, country_code, postcode, geometry) ';
 
         $sSQL  = 'INSERT INTO location_postcode';
         $sSQL .= ' (place_id, indexed_status, country_code, postcode, geometry) ';
@@ -581,19 +510,17 @@ class SetupFunctions
         $sSQL .= " WHERE address ? 'postcode' AND address->'postcode' NOT SIMILAR TO '%(,|;)%'";
         $sSQL .= '       AND geometry IS NOT null';
         $sSQL .= ' GROUP BY country_code, pc';
         $sSQL .= " WHERE address ? 'postcode' AND address->'postcode' NOT SIMILAR TO '%(,|;)%'";
         $sSQL .= '       AND geometry IS NOT null';
         $sSQL .= ' GROUP BY country_code, pc';
-        $this->pgExec($sSQL);
+        $this->oDB->exec($sSQL);
 
 
-        if (CONST_Use_Extra_US_Postcodes) {
-            // only add postcodes that are not yet available in OSM
-            $sSQL  = 'INSERT INTO location_postcode';
-            $sSQL .= ' (place_id, indexed_status, country_code, postcode, geometry) ';
-            $sSQL .= "SELECT nextval('seq_place'), 1, 'us', postcode,";
-            $sSQL .= '       ST_SetSRID(ST_Point(x,y),4326)';
-            $sSQL .= '  FROM us_postcode WHERE postcode NOT IN';
-            $sSQL .= '        (SELECT postcode FROM location_postcode';
-            $sSQL .= "          WHERE country_code = 'us')";
-            $this->pgExec($sSQL);
-        }
+        // only add postcodes that are not yet available in OSM
+        $sSQL  = 'INSERT INTO location_postcode';
+        $sSQL .= ' (place_id, indexed_status, country_code, postcode, geometry) ';
+        $sSQL .= "SELECT nextval('seq_place'), 1, 'us', postcode,";
+        $sSQL .= '       ST_SetSRID(ST_Point(x,y),4326)';
+        $sSQL .= '  FROM us_postcode WHERE postcode NOT IN';
+        $sSQL .= '        (SELECT postcode FROM location_postcode';
+        $sSQL .= "          WHERE country_code = 'us')";
+        $this->oDB->exec($sSQL);
 
         // add missing postcodes for GB (if available)
         $sSQL  = 'INSERT INTO location_postcode';
 
         // add missing postcodes for GB (if available)
         $sSQL  = 'INSERT INTO location_postcode';
@@ -602,80 +529,94 @@ class SetupFunctions
         $sSQL .= '  FROM gb_postcode WHERE postcode NOT IN';
         $sSQL .= '           (SELECT postcode FROM location_postcode';
         $sSQL .= "             WHERE country_code = 'gb')";
         $sSQL .= '  FROM gb_postcode WHERE postcode NOT IN';
         $sSQL .= '           (SELECT postcode FROM location_postcode';
         $sSQL .= "             WHERE country_code = 'gb')";
-        $this->pgExec($sSQL);
+        $this->oDB->exec($sSQL);
 
         if (!$bCMDResultAll) {
             $sSQL = "DELETE FROM word WHERE class='place' and type='postcode'";
             $sSQL .= 'and word NOT IN (SELECT postcode FROM location_postcode)';
 
         if (!$bCMDResultAll) {
             $sSQL = "DELETE FROM word WHERE class='place' and type='postcode'";
             $sSQL .= 'and word NOT IN (SELECT postcode FROM location_postcode)';
-            $this->pgExec($sSQL);
+            $this->oDB->exec($sSQL);
         }
 
         $sSQL = 'SELECT count(getorcreate_postcode_id(v)) FROM ';
         $sSQL .= '(SELECT distinct(postcode) as v FROM location_postcode) p';
         }
 
         $sSQL = 'SELECT count(getorcreate_postcode_id(v)) FROM ';
         $sSQL .= '(SELECT distinct(postcode) as v FROM location_postcode) p';
-        $this->pgExec($sSQL);
+        $this->oDB->exec($sSQL);
     }
 
     public function index($bIndexNoanalyse)
     {
     }
 
     public function index($bIndexNoanalyse)
     {
-        $sOutputFile = '';
-        $sBaseCmd = CONST_InstallPath.'/nominatim/nominatim -i -d '.$this->aDSNInfo['database'].' -P '
-            .$this->aDSNInfo['port'].' -t '.$this->iInstances.$sOutputFile;
+        $oBaseCmd = (new \Nominatim\Shell(CONST_BasePath.'/nominatim/nominatim.py'))
+                    ->addParams('--database', $this->aDSNInfo['database'])
+                    ->addParams('--port', $this->aDSNInfo['port'])
+                    ->addParams('--threads', $this->iInstances);
+
+        if (!$this->bQuiet) {
+            $oBaseCmd->addParams('-v');
+        }
+        if ($this->bVerbose) {
+            $oBaseCmd->addParams('-v');
+        }
         if (isset($this->aDSNInfo['hostspec'])) {
         if (isset($this->aDSNInfo['hostspec'])) {
-            $sBaseCmd .= ' -H '.$this->aDSNInfo['hostspec'];
+            $oBaseCmd->addParams('--host', $this->aDSNInfo['hostspec']);
         }
         if (isset($this->aDSNInfo['username'])) {
         }
         if (isset($this->aDSNInfo['username'])) {
-            $sBaseCmd .= ' -U '.$this->aDSNInfo['username'];
+            $oBaseCmd->addParams('--user', $this->aDSNInfo['username']);
+        }
+        if (isset($this->aDSNInfo['password'])) {
+            $oBaseCmd->addEnvPair('PGPASSWORD', $this->aDSNInfo['password']);
         }
 
         info('Index ranks 0 - 4');
         }
 
         info('Index ranks 0 - 4');
-        $iStatus = $this->runWithPgEnv($sBaseCmd.' -R 4');
+        $oCmd = (clone $oBaseCmd)->addParams('--maxrank', 4);
+        echo $oCmd->escapedCmd();
+        
+        $iStatus = $oCmd->run();
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
         if (!$bIndexNoanalyse) $this->pgsqlRunScript('ANALYSE');
 
         info('Index ranks 5 - 25');
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
         if (!$bIndexNoanalyse) $this->pgsqlRunScript('ANALYSE');
 
         info('Index ranks 5 - 25');
-        $iStatus = $this->runWithPgEnv($sBaseCmd.' -r 5 -R 25');
+        $oCmd = (clone $oBaseCmd)->addParams('--minrank', 5, '--maxrank', 25);
+        $iStatus = $oCmd->run();
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
         if (!$bIndexNoanalyse) $this->pgsqlRunScript('ANALYSE');
 
         info('Index ranks 26 - 30');
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
         if (!$bIndexNoanalyse) $this->pgsqlRunScript('ANALYSE');
 
         info('Index ranks 26 - 30');
-        $iStatus = $this->runWithPgEnv($sBaseCmd.' -r 26');
+        $oCmd = (clone $oBaseCmd)->addParams('--minrank', 26);
+        $iStatus = $oCmd->run();
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
 
         info('Index postcodes');
         $sSQL = 'UPDATE location_postcode SET indexed_status = 0';
         if ($iStatus != 0) {
             fail('error status ' . $iStatus . ' running nominatim!');
         }
 
         info('Index postcodes');
         $sSQL = 'UPDATE location_postcode SET indexed_status = 0';
-        $this->pgExec($sSQL);
+        $this->oDB->exec($sSQL);
     }
 
     public function createSearchIndices()
     {
         info('Create Search indices');
 
     }
 
     public function createSearchIndices()
     {
         info('Create Search indices');
 
+        $sSQL = 'SELECT relname FROM pg_class, pg_index ';
+        $sSQL .= 'WHERE pg_index.indisvalid = false AND pg_index.indexrelid = pg_class.oid';
+        $aInvalidIndices = $this->oDB->getCol($sSQL);
+
+        foreach ($aInvalidIndices as $sIndexName) {
+            info("Cleaning up invalid index $sIndexName");
+            $this->oDB->exec("DROP INDEX $sIndexName;");
+        }
+
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/indices.src.sql');
         $sTemplate = file_get_contents(CONST_BasePath.'/sql/indices.src.sql');
+        if (!$this->bDrop) {
+            $sTemplate .= file_get_contents(CONST_BasePath.'/sql/indices_updates.src.sql');
+        }
         if (!$this->dbReverseOnly()) {
             $sTemplate .= file_get_contents(CONST_BasePath.'/sql/indices_search.src.sql');
         }
         if (!$this->dbReverseOnly()) {
             $sTemplate .= file_get_contents(CONST_BasePath.'/sql/indices_search.src.sql');
         }
-        $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
-        $sTemplate = $this->replaceTablespace(
-            '{ts:address-index}',
-            CONST_Tablespace_Address_Index,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:search-index}',
-            CONST_Tablespace_Search_Index,
-            $sTemplate
-        );
-        $sTemplate = $this->replaceTablespace(
-            '{ts:aux-index}',
-            CONST_Tablespace_Aux_Index,
-            $sTemplate
-        );
+        $sTemplate = $this->replaceSqlPatterns($sTemplate);
+
         $this->pgsqlRunScript($sTemplate);
     }
 
         $this->pgsqlRunScript($sTemplate);
     }
 
@@ -734,7 +675,7 @@ class SetupFunctions
                        );
 
         $aDropTables = array();
                        );
 
         $aDropTables = array();
-        $aHaveTables = chksql($this->oDB->getCol("SELECT tablename FROM pg_tables WHERE schemaname='public'"));
+        $aHaveTables = $this->oDB->getListOfTables();
 
         foreach ($aHaveTables as $sTable) {
             $bFound = false;
 
         foreach ($aHaveTables as $sTable) {
             $bFound = false;
@@ -747,12 +688,14 @@ class SetupFunctions
             if (!$bFound) array_push($aDropTables, $sTable);
         }
         foreach ($aDropTables as $sDrop) {
             if (!$bFound) array_push($aDropTables, $sTable);
         }
         foreach ($aDropTables as $sDrop) {
-            if ($this->bVerbose) echo "Dropping table $sDrop\n";
-            $this->oDB->exec("DROP TABLE $sDrop CASCADE");
-            // ignore warnings/errors as they might be caused by a table having
-            // been deleted already by CASCADE
+            $this->dropTable($sDrop);
         }
 
         }
 
+        $this->removeFlatnodeFile();
+    }
+
+    private function removeFlatnodeFile()
+    {
         if (!is_null(CONST_Osm2pgsql_Flatnode_File) && CONST_Osm2pgsql_Flatnode_File) {
             if (file_exists(CONST_Osm2pgsql_Flatnode_File)) {
                 if ($this->bVerbose) echo 'Deleting '.CONST_Osm2pgsql_Flatnode_File."\n";
         if (!is_null(CONST_Osm2pgsql_Flatnode_File) && CONST_Osm2pgsql_Flatnode_File) {
             if (file_exists(CONST_Osm2pgsql_Flatnode_File)) {
                 if ($this->bVerbose) echo 'Deleting '.CONST_Osm2pgsql_Flatnode_File."\n";
@@ -761,19 +704,6 @@ class SetupFunctions
         }
     }
 
         }
     }
 
-    private function pgsqlRunDropAndRestore($sDumpFile)
-    {
-        $sCMD = 'pg_restore -p '.$this->aDSNInfo['port'].' -d '.$this->aDSNInfo['database'].' -Fc --clean '.$sDumpFile;
-        if (isset($this->aDSNInfo['hostspec'])) {
-            $sCMD .= ' -h '.$this->aDSNInfo['hostspec'];
-        }
-        if (isset($this->aDSNInfo['username'])) {
-            $sCMD .= ' -U '.$this->aDSNInfo['username'];
-        }
-
-        $this->runWithPgEnv($sCMD);
-    }
-
     private function pgsqlRunScript($sScript, $bfatal = true)
     {
         runSQLScript(
     private function pgsqlRunScript($sScript, $bfatal = true)
     {
         runSQLScript(
@@ -786,7 +716,22 @@ class SetupFunctions
 
     private function createSqlFunctions()
     {
 
     private function createSqlFunctions()
     {
-        $sTemplate = file_get_contents(CONST_BasePath.'/sql/functions.sql');
+        $sBasePath = CONST_BasePath.'/sql/functions/';
+        $sTemplate = file_get_contents($sBasePath.'utils.sql');
+        $sTemplate .= file_get_contents($sBasePath.'normalization.sql');
+        $sTemplate .= file_get_contents($sBasePath.'ranking.sql');
+        $sTemplate .= file_get_contents($sBasePath.'importance.sql');
+        $sTemplate .= file_get_contents($sBasePath.'address_lookup.sql');
+        $sTemplate .= file_get_contents($sBasePath.'interpolation.sql');
+        if ($this->oDB->tableExists('place')) {
+            $sTemplate .= file_get_contents($sBasePath.'place_triggers.sql');
+        }
+        if ($this->oDB->tableExists('placex')) {
+            $sTemplate .= file_get_contents($sBasePath.'placex_triggers.sql');
+        }
+        if ($this->oDB->tableExists('location_postcode')) {
+            $sTemplate .= file_get_contents($sBasePath.'postcode_triggers.sql');
+        }
         $sTemplate = str_replace('{modulepath}', $this->sModulePath, $sTemplate);
         if ($this->bEnableDiffUpdates) {
             $sTemplate = str_replace('RETURN NEW; -- %DIFFUPDATES%', '--', $sTemplate);
         $sTemplate = str_replace('{modulepath}', $this->sModulePath, $sTemplate);
         if ($this->bEnableDiffUpdates) {
             $sTemplate = str_replace('RETURN NEW; -- %DIFFUPDATES%', '--', $sTemplate);
@@ -832,19 +777,21 @@ class SetupFunctions
     {
         if (!file_exists($sFilename)) fail('unable to find '.$sFilename);
 
     {
         if (!file_exists($sFilename)) fail('unable to find '.$sFilename);
 
-        $sCMD = 'psql -p '.$this->aDSNInfo['port'].' -d '.$this->aDSNInfo['database'];
+        $oCmd = (new \Nominatim\Shell('psql'))
+                ->addParams('--port', $this->aDSNInfo['port'])
+                ->addParams('--dbname', $this->aDSNInfo['database']);
+
         if (!$this->bVerbose) {
         if (!$this->bVerbose) {
-            $sCMD .= ' -q';
+            $oCmd->addParams('--quiet');
         }
         if (isset($this->aDSNInfo['hostspec'])) {
         }
         if (isset($this->aDSNInfo['hostspec'])) {
-            $sCMD .= ' -h '.$this->aDSNInfo['hostspec'];
+            $oCmd->addParams('--host', $this->aDSNInfo['hostspec']);
         }
         if (isset($this->aDSNInfo['username'])) {
         }
         if (isset($this->aDSNInfo['username'])) {
-            $sCMD .= ' -U '.$this->aDSNInfo['username'];
+            $oCmd->addParams('--username', $this->aDSNInfo['username']);
         }
         }
-        $aProcEnv = null;
         if (isset($this->aDSNInfo['password'])) {
         if (isset($this->aDSNInfo['password'])) {
-            $aProcEnv = array_merge(array('PGPASSWORD' => $this->aDSNInfo['password']), $_ENV);
+            $oCmd->addEnvPair('PGPASSWORD', $this->aDSNInfo['password']);
         }
         $ahGzipPipes = null;
         if (preg_match('/\\.gz$/', $sFilename)) {
         }
         $ahGzipPipes = null;
         if (preg_match('/\\.gz$/', $sFilename)) {
@@ -853,12 +800,14 @@ class SetupFunctions
                              1 => array('pipe', 'w'),
                              2 => array('file', '/dev/null', 'a')
                             );
                              1 => array('pipe', 'w'),
                              2 => array('file', '/dev/null', 'a')
                             );
-            $hGzipProcess = proc_open('zcat '.$sFilename, $aDescriptors, $ahGzipPipes);
+            $oZcatCmd = new \Nominatim\Shell('zcat', $sFilename);
+
+            $hGzipProcess = proc_open($oZcatCmd->escapedCmd(), $aDescriptors, $ahGzipPipes);
             if (!is_resource($hGzipProcess)) fail('unable to start zcat');
             $aReadPipe = $ahGzipPipes[1];
             fclose($ahGzipPipes[0]);
         } else {
             if (!is_resource($hGzipProcess)) fail('unable to start zcat');
             $aReadPipe = $ahGzipPipes[1];
             fclose($ahGzipPipes[0]);
         } else {
-            $sCMD .= ' -f '.$sFilename;
+            $oCmd->addParams('--file', $sFilename);
             $aReadPipe = array('pipe', 'r');
         }
         $aDescriptors = array(
             $aReadPipe = array('pipe', 'r');
         }
         $aDescriptors = array(
@@ -867,7 +816,8 @@ class SetupFunctions
                          2 => array('file', '/dev/null', 'a')
                         );
         $ahPipes = null;
                          2 => array('file', '/dev/null', 'a')
                         );
         $ahPipes = null;
-        $hProcess = proc_open($sCMD, $aDescriptors, $ahPipes, null, $aProcEnv);
+
+        $hProcess = proc_open($oCmd->escapedCmd(), $aDescriptors, $ahPipes, null, $oCmd->aEnv);
         if (!is_resource($hProcess)) fail('unable to start pgsql');
         // TODO: error checking
         while (!feof($ahPipes[1])) {
         if (!is_resource($hProcess)) fail('unable to start pgsql');
         // TODO: error checking
         while (!feof($ahPipes[1])) {
@@ -884,43 +834,43 @@ class SetupFunctions
         }
     }
 
         }
     }
 
-    private function replaceTablespace($sTemplate, $sTablespace, $sSql)
+    private function replaceSqlPatterns($sSql)
     {
     {
-        if ($sTablespace) {
-            $sSql = str_replace($sTemplate, 'TABLESPACE "'.$sTablespace.'"', $sSql);
-        } else {
-            $sSql = str_replace($sTemplate, '', $sSql);
-        }
-        return $sSql;
-    }
-
-    private function runWithPgEnv($sCmd)
-    {
-        if ($this->bVerbose) {
-            echo "Execute: $sCmd\n";
-        }
-
-        $aProcEnv = null;
+        $sSql = str_replace('{www-user}', CONST_Database_Web_User, $sSql);
+
+        $aPatterns = array(
+                      '{ts:address-data}' => CONST_Tablespace_Address_Data,
+                      '{ts:address-index}' => CONST_Tablespace_Address_Index,
+                      '{ts:search-data}' => CONST_Tablespace_Search_Data,
+                      '{ts:search-index}' =>  CONST_Tablespace_Search_Index,
+                      '{ts:aux-data}' =>  CONST_Tablespace_Aux_Data,
+                      '{ts:aux-index}' =>  CONST_Tablespace_Aux_Index,
+        );
 
 
-        if (isset($this->aDSNInfo['password'])) {
-            $aProcEnv = array_merge(array('PGPASSWORD' => $this->aDSNInfo['password']), $_ENV);
+        foreach ($aPatterns as $sPattern => $sTablespace) {
+            if ($sTablespace) {
+                $sSql = str_replace($sPattern, 'TABLESPACE "'.$sTablespace.'"', $sSql);
+            } else {
+                $sSql = str_replace($sPattern, '', $sSql);
+            }
         }
 
         }
 
-        return runWithEnv($sCmd, $aProcEnv);
+        return $sSql;
     }
 
     /**
     }
 
     /**
-     * Execute the SQL command on the open database.
+     * Drop table with the given name if it exists.
      *
      *
-     * @param string $sSQL SQL command to execute.
+     * @param string $sName Name of table to remove.
      *
      * @return null
      *
      * @pre connect() must have been called.
      */
      *
      * @return null
      *
      * @pre connect() must have been called.
      */
-    private function pgExec($sSQL)
+    private function dropTable($sName)
     {
     {
-        $this->oDB->exec($sSQL);
+        if ($this->bVerbose) echo "Dropping table $sName\n";
+        $this->oDB->deleteTable($sName);
     }
 
     /**
     }
 
     /**
Open Source search based on OpenStreetMap data