add helper function for execute_values

Make psycopg2's convenience function accessible through
the cursor.

nominatim/db/connection.py

@@ -26,6 +26,16 @@ class _Cursor(psycopg2.extras.DictCursor):
 
         super().execute(query, args)
 
+
+    def execute_values(self, sql, argslist, template=None):
+        """ Wrapper for the psycopg2 convenience function to execute
+            SQL for a list of values.
+        """
+        LOG.debug("SQL execute_values(%s, %s)", sql, argslist)
+
+        psycopg2.extras.execute_values(self, sql, argslist, template=template)
+
+
     def scalar(self, sql, args=None):
         """ Execute query that returns a single value. The value is returned.
             If the query yields more than one row, a ValueError is raised.

nominatim/tokenizer/legacy_icu_tokenizer.py

@@ -9,8 +9,6 @@ import re
 from textwrap import dedent
 from pathlib import Path
 
-import psycopg2.extras
-
 from nominatim.db.connection import connect
 from nominatim.db.properties import set_property, get_property
 from nominatim.db.utils import CopyBuffer
@@ -359,8 +357,7 @@ class LegacyICUNameAnalyzer:
         to_delete = existing_phrases - new_phrases
 
         if to_delete:
-            psycopg2.extras.execute_values(
-                cursor,
+            cursor.execute_values(
                 """ DELETE FROM word USING (VALUES %s) as v(name, in_class, in_type, op)
                     WHERE word = name and class = in_class and type = in_type
                           and ((op = '-' and operator is null) or op = operator)""",

nominatim/tokenizer/legacy_tokenizer.py

@@ -370,8 +370,7 @@ class LegacyNameAnalyzer:
             to_delete = existing_phrases - norm_phrases
 
             if to_add:
-                psycopg2.extras.execute_values(
-                    cur,
+                cur.execute_values(
                     """ INSERT INTO word (word_id, word_token, word, class, type,
                                           search_name_count, operator)
                         (SELECT nextval('seq_word'), ' ' || make_standard_name(name), name,
@@ -381,8 +380,7 @@ class LegacyNameAnalyzer:
                     to_add)
 
             if to_delete and should_replace:
-                psycopg2.extras.execute_values(
-                    cur,
+                cur.execute_values(
                     """ DELETE FROM word USING (VALUES %s) as v(name, in_class, in_type, op)
                         WHERE word = name and class = in_class and type = in_type
                               and ((op = '-' and operator is null) or op = operator)""",

nominatim/tools/postcodes.py

@@ -7,7 +7,7 @@ import gzip
 import logging
 from math import isfinite
 
-from psycopg2.extras import execute_values
+from psycopg2 import sql as pysql
 
 from nominatim.db.connection import connect
 
@@ -52,27 +52,26 @@ class _CountryPostcodesCollector:
 
         with conn.cursor() as cur:
             if to_add:
-                execute_values(cur,
-                               """INSERT INTO location_postcode
-                                      (place_id, indexed_status, country_code,
-                                       postcode, geometry) VALUES %s""",
-                               to_add,
-                               template="""(nextval('seq_place'), 1, '{}',
-                                           %s, 'SRID=4326;POINT(%s %s)')
-                                        """.format(self.country))
+                cur.execute_values(
+                    """INSERT INTO location_postcode
+                         (place_id, indexed_status, country_code,
+                          postcode, geometry) VALUES %s""",
+                    to_add,
+                    template=pysql.SQL("""(nextval('seq_place'), 1, {},
+                                          %s, 'SRID=4326;POINT(%s %s)')
+                                       """).format(pysql.Literal(self.country)))
             if to_delete:
                 cur.execute("""DELETE FROM location_postcode
                                WHERE country_code = %s and postcode = any(%s)
                             """, (self.country, to_delete))
             if to_update:
-                execute_values(cur,
-                               """UPDATE location_postcode
-                                  SET indexed_status = 2,
-                                      geometry = ST_SetSRID(ST_Point(v.x, v.y), 4326)
-                                  FROM (VALUES %s) AS v (pc, x, y)
-                                  WHERE country_code = '{}' and postcode = pc
-                               """.format(self.country),
-                               to_update)
+                cur.execute_values(
+                    pysql.SQL("""UPDATE location_postcode
+                                 SET indexed_status = 2,
+                                     geometry = ST_SetSRID(ST_Point(v.x, v.y), 4326)
+                                 FROM (VALUES %s) AS v (pc, x, y)
+                                 WHERE country_code = {} and postcode = pc
+                              """).format(pysql.Literal(self.country)), to_update)
 
 
     def _compute_changes(self, conn):

nominatim/tools/refresh.py

@@ -5,7 +5,7 @@ import json
 import logging
 from textwrap import dedent
 
-from psycopg2.extras import execute_values
+from psycopg2 import sql as pysql
 
 from nominatim.db.utils import execute_file
 from nominatim.db.sql_preprocessor import SQLPreprocessor
@@ -57,7 +57,8 @@ def load_address_levels(conn, table, levels):
                                         rank_search SMALLINT,
                                         rank_address SMALLINT)""".format(table))
 
-        execute_values(cur, "INSERT INTO {} VALUES %s".format(table), rows)
+        cur.execute_values(pysql.SQL("INSERT INTO {} VALUES %s")
+                                .format(pysql.Identifier(table)), rows)
 
         cur.execute('CREATE UNIQUE INDEX ON {} (country_code, class, type)'.format(table))