Merge remote-tracking branch 'upstream/master'

[nominatim.git] / lib / DB.php

diff --git a/lib/DB.php b/lib/DB.php
index 17dfe67d3a9e02a02fba8e5c6fd26e070d7fe235..6307d6ca2847bdf2a9d90354c33d79983c4c8077 100644 (file)
--- a/lib/DB.php
+++ b/lib/DB.php
@@ -74,12 +74,7 @@ class DB
     public function getRow($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
     {
         try {
-            if (isset($aInputVars)) {
-                $stmt = $this->connection->prepare($sSQL);
-                $stmt->execute($aInputVars);
-            } else {
-                $stmt = $this->connection->query($sSQL);
-            }
+            $stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
             $row = $stmt->fetch();
         } catch (\PDOException $e) {
             throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
@@ -98,12 +93,7 @@ class DB
     public function getOne($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
     {
         try {
-            if (isset($aInputVars)) {
-                $stmt = $this->connection->prepare($sSQL);
-                $stmt->execute($aInputVars);
-            } else {
-                $stmt = $this->connection->query($sSQL);
-            }
+            $stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
             $row = $stmt->fetch(\PDO::FETCH_NUM);
             if ($row === false) return false;
         } catch (\PDOException $e) {
@@ -123,12 +113,7 @@ class DB
     public function getAll($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
     {
         try {
-            if (isset($aInputVars)) {
-                $stmt = $this->connection->prepare($sSQL);
-                $stmt->execute($aInputVars);
-            } else {
-                $stmt = $this->connection->query($sSQL);
-            }
+            $stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
             $rows = $stmt->fetchAll();
         } catch (\PDOException $e) {
             throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
@@ -148,13 +133,9 @@ class DB
     {
         $aVals = array();
         try {
-            if (isset($aInputVars)) {
-                $stmt = $this->connection->prepare($sSQL);
-                $stmt->execute($aInputVars);
-            } else {
-                $stmt = $this->connection->query($sSQL);
-            }
-            while ($val = $stmt->fetchColumn(0)) { // returns first column or false
+            $stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
+
+            while (($val = $stmt->fetchColumn(0)) !== false) { // returns first column or false
                 $aVals[] = $val;
             }
         } catch (\PDOException $e) {
@@ -174,12 +155,8 @@ class DB
     public function getAssoc($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
     {
         try {
-            if (isset($aInputVars)) {
-                $stmt = $this->connection->prepare($sSQL);
-                $stmt->execute($aInputVars);
-            } else {
-                $stmt = $this->connection->query($sSQL);
-            }
+            $stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
+
             $aList = array();
             while ($aRow = $stmt->fetch(\PDO::FETCH_NUM)) {
                 $aList[$aRow[0]] = $aRow[1];
@@ -190,6 +167,27 @@ class DB
         return $aList;
     }
 
+    /**
+     * Executes query. Returns a PDO statement to iterate over.
+     *
+     * @param string  $sSQL
+     *
+     * @return PDOStatement
+     */
+    public function getQueryStatement($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
+    {
+        try {
+            if (isset($aInputVars)) {
+                $stmt = $this->connection->prepare($sSQL);
+                $stmt->execute($aInputVars);
+            } else {
+                $stmt = $this->connection->query($sSQL);
+            }
+        } catch (\PDOException $e) {
+            throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
+        }
+        return $stmt;
+    }
 
     /**
      * St. John's Way => 'St. John\'s Way'
@@ -242,6 +240,76 @@ class DB
         return ($this->getOne($sSQL, array(':tablename' => $sTableName)) == 1);
     }
 
+    /**
+    * Check if an index exists in the database. Optional filtered by tablename
+    *
+    * @param string  $sTableName
+    *
+    * @return boolean
+    */
+    public function indexExists($sIndexName, $sTableName = null)
+    {
+        return in_array($sIndexName, $this->getListOfIndices($sTableName));
+    }
+
+    /**
+    * Returns a list of index names in the database, optional filtered by tablename
+    *
+    * @param string  $sTableName
+    *
+    * @return array
+    */
+    public function getListOfIndices($sTableName = null)
+    {
+        //  table_name            | index_name                      | column_name
+        // -----------------------+---------------------------------+--------------
+        //  country_name          | idx_country_name_country_code   | country_code
+        //  country_osm_grid      | idx_country_osm_grid_geometry   | geometry
+        //  import_polygon_delete | idx_import_polygon_delete_osmid | osm_id
+        //  import_polygon_delete | idx_import_polygon_delete_osmid | osm_type
+        //  import_polygon_error  | idx_import_polygon_error_osmid  | osm_id
+        //  import_polygon_error  | idx_import_polygon_error_osmid  | osm_type
+        $sSql = <<< END
+SELECT
+    t.relname as table_name,
+    i.relname as index_name,
+    a.attname as column_name
+FROM
+    pg_class t,
+    pg_class i,
+    pg_index ix,
+    pg_attribute a
+WHERE
+    t.oid = ix.indrelid
+    and i.oid = ix.indexrelid
+    and a.attrelid = t.oid
+    and a.attnum = ANY(ix.indkey)
+    and t.relkind = 'r'
+    and i.relname NOT LIKE 'pg_%'
+    FILTERS
+ ORDER BY
+    t.relname,
+    i.relname,
+    a.attname
+END;
+
+        $aRows = null;
+        if ($sTableName) {
+            $sSql = str_replace('FILTERS', 'and t.relname = :tablename', $sSql);
+            $aRows = $this->getAll($sSql, array(':tablename' => $sTableName));
+        } else {
+            $sSql = str_replace('FILTERS', '', $sSql);
+            $aRows = $this->getAll($sSql);
+        }
+
+        $aIndexNames = array_unique(array_map(function ($aRow) {
+            return $aRow['index_name'];
+        }, $aRows));
+        sort($aIndexNames);
+
+        return $aIndexNames;
+    }
+
     /**
      * Since the DSN includes the database name, checks if the connection works.
      *
@@ -286,7 +354,7 @@ class DB
     {
         // https://secure.php.net/manual/en/ref.pdo-pgsql.connection.php
         $aInfo = array();
-        if (preg_match('/^pgsql:(.+)/', $sDSN, $aMatches)) {
+        if (preg_match('/^pgsql:(.+)$/', $sDSN, $aMatches)) {
             foreach (explode(';', $aMatches[1]) as $sKeyVal) {
                 list($sKey, $sVal) = explode('=', $sKeyVal, 2);
                 if ($sKey == 'host') $sKey = 'hostspec';