From e868574f0202fd75321115361ec685b1526a691b Mon Sep 17 00:00:00 2001
From: Russell Smith <mr-russ@smith2001.net>
Date: Fri, 1 Jul 2016 09:12:41 +1000
Subject: [PATCH] MDL-48856 dmllib: Adjust performance improvements.

---
 lib/dml/pgsql_native_moodle_database.php | 60 +++++++++---------------
 1 file changed, 21 insertions(+), 39 deletions(-)

diff --git a/lib/dml/pgsql_native_moodle_database.php b/lib/dml/pgsql_native_moodle_database.php
index 86a10bb7ea9..97ba197d220 100644
--- a/lib/dml/pgsql_native_moodle_database.php
+++ b/lib/dml/pgsql_native_moodle_database.php
@@ -586,6 +586,8 @@ class pgsql_native_moodle_database extends moodle_database {
      * @return mixed the normalised value
      */
     protected function normalise_value($column, $value) {
+        $this->detect_objects($value);
+
         if (is_bool($value)) { // Always, convert boolean to int
             $value = (int)$value;
 
@@ -600,8 +602,6 @@ class pgsql_native_moodle_database extends moodle_database {
             if ($column->meta_type === 'I' or $column->meta_type === 'F' or $column->meta_type === 'N') {
                 $value = 0; // prevent '' problems in numeric fields
             }
-        } else if (is_object($value)) {
-            $this->detect_objects($value);
         }
         return $value;
     }
@@ -678,11 +678,7 @@ class pgsql_native_moodle_database extends moodle_database {
         }
 
         $this->query_start($sql, $params, SQL_QUERY_UPDATE);
-        if (empty($params)) {
-            $result = pg_query($this->pgsql, $sql);
-        } else {
-            $result = pg_query_params($this->pgsql, $sql, $params);
-        }
+        $result = pg_query_params($this->pgsql, $sql, $params);
         $this->query_end($result);
 
         pg_free_result($result);
@@ -710,19 +706,11 @@ class pgsql_native_moodle_database extends moodle_database {
 
         list($limitfrom, $limitnum) = $this->normalise_limit_from_num($limitfrom, $limitnum);
 
-        if ($limitfrom or $limitnum) {
-            if ($limitnum < 1) {
-                $limitnum = "ALL";
-            } else if (PHP_INT_MAX - $limitnum < $limitfrom) {
-                // this is a workaround for weird max int problem
-                $limitnum = "ALL";
-            }
-            if ($limitnum != 'ALL') {
-                $sql .= " LIMIT $limitnum";
-            }
-            if (!empty($limitfrom)) {
-                $sql .= " OFFSET $limitfrom";
-            }
+        if ($limitnum) {
+            $sql .= " LIMIT $limitnum";
+        }
+        if ($limitfrom) {
+            $sql .= " OFFSET $limitfrom";
         }
 
         list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
@@ -757,19 +745,11 @@ class pgsql_native_moodle_database extends moodle_database {
 
         list($limitfrom, $limitnum) = $this->normalise_limit_from_num($limitfrom, $limitnum);
 
-        if ($limitfrom or $limitnum) {
-            if ($limitnum < 1) {
-                $limitnum = "ALL";
-            } else if (PHP_INT_MAX - $limitnum < $limitfrom) {
-                // this is a workaround for weird max int problem
-                $limitnum = "ALL";
-            }
-            if ($limitnum != 'ALL') {
-                $sql .= " LIMIT $limitnum";
-            }
-            if (!empty($limitfrom)) {
-                $sql .= " OFFSET $limitfrom";
-            }
+        if ($limitnum) {
+            $sql .= " LIMIT $limitnum";
+        }
+        if ($limitfrom) {
+            $sql .= " OFFSET $limitfrom";
         }
 
         list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
@@ -787,9 +767,12 @@ class pgsql_native_moodle_database extends moodle_database {
             }
         }
 
+        $rows = pg_fetch_all($result);
+        pg_free_result($result);
+
         $return = array();
-        if ($result) {
-            while ($row = pg_fetch_object($result)) {
+        if ($rows) {
+            foreach ($rows as $row) {
                 $id = reset($row);
                 if ($blobs) {
                     foreach ($blobs as $blob) {
@@ -797,14 +780,13 @@ class pgsql_native_moodle_database extends moodle_database {
                     }
                 }
                 if (isset($return[$id])) {
-                    debugging("Did you remember to make the first column something unique in your call to get_records? Duplicate value '$id' found in column '".key($row)."'.", DEBUG_DEVELOPER);
+                    $colname = key($row);
+                    debugging("Did you remember to make the first column something unique in your call to get_records? Duplicate value '$id' found in column '$colname'.", DEBUG_DEVELOPER);
                 }
-                $return[$id] = $row;
+                $return[$id] = (object)$row;
             }
         }
 
-        pg_free_result($result);
-
         return $return;
     }