From: stronk7 <stronk7>
Date: Mon, 10 Sep 2007 22:00:24 +0000 (+0000)
Subject: Preparing getCheckConstraintsFromDB() to retrieve the check constraint
X-Git-Url: http://git.mjollnir.org/gw?a=commitdiff_plain;h=a347e5e4398e4c2219920fd6a9782cef69668f01;p=moodle.git

Preparing getCheckConstraintsFromDB() to retrieve the check constraint
defined for one field. Not used yet but I need it in CVS now.
---

diff --git a/lib/xmldb/classes/generators/mssql/mssql.class.php b/lib/xmldb/classes/generators/mssql/mssql.class.php
index 4552deb261..09e4e0a60e 100644
--- a/lib/xmldb/classes/generators/mssql/mssql.class.php
+++ b/lib/xmldb/classes/generators/mssql/mssql.class.php
@@ -470,6 +470,22 @@ class XMLDBmssql extends XMLDBgenerator {
             }
         }
 
+    /// Filter by the required field if specified
+        if ($xmldb_field) {
+            $filtered_results = array();
+            $filter = $xmldb_field->getName();
+        /// Lets clean a bit each constraint description, looking for the filtered field
+            foreach ($results as $key => $result) {
+                $description = trim(preg_replace('/[\(\)]/', '',  $result->description));   // Parenthesis out & trim
+                /// description starts by [$filter] assume it's a constraint beloging to the field
+                if (preg_match("/^\[{$filter}\]/i", $description)) {
+                    $filtered_results[$key] = $result;
+                }
+            }
+        /// Assign filtered results to the final results array
+            $results =  $filtered_results;
+        }
+
         return $results;
     }
 
diff --git a/lib/xmldb/classes/generators/mysql/mysql.class.php b/lib/xmldb/classes/generators/mysql/mysql.class.php
index 98c39cae34..a7c0a83dac 100644
--- a/lib/xmldb/classes/generators/mysql/mysql.class.php
+++ b/lib/xmldb/classes/generators/mysql/mysql.class.php
@@ -280,6 +280,17 @@ class XMLDBmysql extends XMLDBGenerator {
             }
         }
 
+    /// Filter by the required field if specified
+        if ($xmldb_field) {
+            $filter = $xmldb_field->getName();
+        /// Check if some of the checks belong to the field (easy under MySQL)
+            if (array_key_exists($filter, $results)) {
+                $results = array($filter => $results[$filter]);
+            } else {
+                $results = array();
+            }
+        }
+
         return $results;
     }
 
diff --git a/lib/xmldb/classes/generators/oci8po/oci8po.class.php b/lib/xmldb/classes/generators/oci8po/oci8po.class.php
index 694d6003d5..5ff92a5801 100644
--- a/lib/xmldb/classes/generators/oci8po/oci8po.class.php
+++ b/lib/xmldb/classes/generators/oci8po/oci8po.class.php
@@ -500,6 +500,12 @@ class XMLDBoci8po extends XMLDBgenerator {
             }
         }
 
+    /// Filter by the required field if specified
+        if ($xmldb_field) {
+            $filter = $xmldb_field->getName();
+        /// Lets clean a bit each constraint description, looking for the filtered fiel 
+        }
+
         return $results;
     }
 
diff --git a/lib/xmldb/classes/generators/postgres7/postgres7.class.php b/lib/xmldb/classes/generators/postgres7/postgres7.class.php
index 8f7fb6a033..e9c3832358 100644
--- a/lib/xmldb/classes/generators/postgres7/postgres7.class.php
+++ b/lib/xmldb/classes/generators/postgres7/postgres7.class.php
@@ -455,6 +455,26 @@ class XMLDBpostgres7 extends XMLDBgenerator {
             }
         }
 
+    /// Filter by the required field if specified
+        if ($xmldb_field) {
+            $filtered_results = array();
+            $filter = $xmldb_field->getName();
+        /// Lets clean a bit each constraint description, looking for the filtered field
+            foreach ($results as $key => $result) {
+                $description = preg_replace('/\("(.*?)"\)/', '($1)', $result->description);// Double quotes out
+                $description = preg_replace('/[\(\)]/', '', $description);                 // Parenthesis out
+                $description = preg_replace('/::[a-z]+/i', '', $description);              // Casts out
+                $description = preg_replace("/({$filter})/i", '@$1@', $description);
+                $description = trim(preg_replace('/ or /i', ' OR ', $description));        // Uppercase or & trim
+            /// description starts by @$filter@ assume it's a constraint beloging to the field
+                if (preg_match("/^@{$filter}@/i", $description)) {
+                    $filtered_results[$key] = $result;
+                }
+            }
+        /// Assign filtered results to the final results array
+            $results =  $filtered_results;
+        }
+
         return $results;
     }