Drop all the unique keys inside PostgreSQL DB and convert them to

their equivalest unique indexes. We aren't going to allow unique
keys from 1.7 and upwards (until we decide to enforce referential
intregrity and until ADOdb support it)

diff --git a/lib/db/postgres7.php b/lib/db/postgres7.php
index 2fe94a979c6a111a2232353cdf495c81b75a7c00..73f6b8f6f9c37e07ced8920bf96f804cbd13b691 100644 (file)
--- a/lib/db/postgres7.php
+++ b/lib/db/postgres7.php
@@ -1923,6 +1923,37 @@ function main_upgrade($oldversion=0) {
         execute_sql("CREATE UNIQUE INDEX {$CFG->prefix}role_sor_uix ON {$CFG->prefix}role (sortorder);", false);
     }
 
+    if ($oldversion < 2006092510) {
+        /// Convert all the PG unique keys into their corresponding unique indexes
+        /// we don't want such keys inside Moodle 1.7 and above
+        /// Look for all the UNIQUE CONSTRAINSTS existing in DB
+        $uniquecons = get_records_sql ("SELECT conname, relname, conkey, clas.oid AS tableoid
+                                          FROM pg_constraint cons,
+                                               pg_class clas
+                                         WHERE cons.contype='u'
+                                           AND cons.conrelid = clas.oid");
+        /// Iterate over every unique constraint, calculating its fields
+        if ($uniquecons) {
+            foreach ($uniquecons as $uniquecon) {
+                $conscols = trim(trim($uniquecon->conkey, '}'), '{');
+                $conscols = explode(',', $conscols);
+            /// Iterate over each column to fetch its name
+                $indexcols = array();
+                foreach ($conscols as $conscol) {
+                    $column = get_record_sql ("SELECT attname, attname
+                                                 FROM pg_attribute
+                                                WHERE attrelid = $uniquecon->tableoid
+                                                  AND attnum   = $conscol");
+                    $indexcols[] = $column->attname;
+                }
+            /// Drop the old UNIQUE CONSTRAINT
+                execute_sql ("ALTER TABLE $uniquecon->relname DROP CONSTRAINT $uniquecon->conname", false);
+            /// Create the new UNIQUE INDEX
+                execute_sql ("CREATE UNIQUE INDEX {$uniquecon->relname}_".implode('_', $indexcols)."_uix ON $uniquecon->relname (".implode(', ', $indexcols).')', false);
+            }
+        }
+    }
+
 
     return $result;
 }

diff --git a/version.php b/version.php
index 7b55067aee6f10a1c11627d2d2f15941adb9285e..c169f54635b8bf9da4c8668902903e760b09ae11 100644 (file)
--- a/version.php
+++ b/version.php
@@ -6,7 +6,7 @@
 // This is compared against the values stored in the database to determine
 // whether upgrades should be performed (see lib/db/*.php)
 
-   $version = 2006092409;  // YYYYMMDD = date
+   $version = 2006092410;  // YYYYMMDD = date
                            //       XY = increments within a single day
 
    $release = '1.7 dev';    // Human-friendly version name