From d590337cf5b7d0ee6e535474e284359d0ae93b0f Mon Sep 17 00:00:00 2001
From: Dominique Fournier <dominique@fournier38.fr>
Date: Fri, 13 Mar 2015 10:35:24 +0000
Subject: [PATCH] dblayer : add the possibility to filtering on foreignkeys
 when reading

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@2021 bf3deb0d-5f1a-0410-827f-c0cc1f45334c
---
 dblayer.php | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/dblayer.php b/dblayer.php
index f6d3cdb..50822b8 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -600,9 +600,10 @@ class dblayer extends PDO
          $order = array (array ($key, $orientation), ...)
          $key=>column, $orientation=ASC/DESC
       @param bool|null $whereOr The WHERE parameters are separated by OR instead
-                                of AND*/
+                                of AND
+      @param array|null $foreignSelect Add a filter on foreign keys */
   public function read ($select=null, $display=null, $order=null,
-                        $whereOr=false)
+                        $whereOr=false, $foreignSelect=null)
   {
     if ($this->debug) echo "== Entering read\n";
     if ($this->sep === "")
@@ -638,9 +639,12 @@ class dblayer extends PDO
     $req .= implode ("$this->sep,$this->sep", $display);
     $req .= "$this->sep ";
     $req .= "FROM $this->sep$this->tableprefix$this->table$this->sep";
+    if ($select !== null || $foreignSelect !== null)
+    {
+      $req .= " WHERE (";
+    }
     if ($select !== null)
     {
-      $req .= " WHERE ";
       // TODO Allow a field=>value in plus of array("field","value")
       foreach ($select as $n=>$s)
       {
@@ -662,6 +666,24 @@ class dblayer extends PDO
         // TODO : Test for PostgreSQL (Tested for SQLite and MySQL)
         $req .= " $this->sep".$s[0]."$this->sep ".$s[2]." :".md5 ($s[0]);
       }
+      $req .=")";
+    }
+    if ($select !== null && $foreignSelect !== null)
+      $req .= " AND (";
+    if ($foreignSelect !== null)
+    {
+      // TODO Allow a field=>value in plus of array("field","value")
+      foreach ($foreignSelect as $n=>$s)
+      {
+        if ($n > 0)
+        {
+          $req .= " AND";
+        }
+        if (!isset ($s[2]))
+          $s[2] = "=";
+        $req .= " $this->sep".$s[0]."$this->sep ".$s[2]." :".md5 ($s[0]);
+      }
+      $req .=")";
     }
 
     if ($order !== null)
@@ -700,6 +722,15 @@ class dblayer extends PDO
         $st->bindValue (":".md5 ($s[0]), $s[1]);
       }
     }
+    if ($foreignSelect !== null)
+    {
+      foreach ($foreignSelect as $s)
+      {
+        if ($this->debug) echo "DEBUG BIND : ".$s[0]."(".md5 ($s[0]).")->".
+                               var_export ($s[1], TRUE)."\n";
+        $st->bindValue (":".md5 ($s[0]), $s[1]);
+      }
+    }
 
     $rc = $st->execute ();
     if ($rc === false)