implementations sgbd dans env/sgbd

[mtweb] / mw / env / sgbd / mw_mysql.php

diff --git a/mw/env/sgbd/mw_mysql.php b/mw/env/sgbd/mw_mysql.php
new file mode 100644 (file)
index 0000000..5128c04
--- /dev/null
+++ b/mw/env/sgbd/mw_mysql.php
@@ -0,0 +1,147 @@
+<?php
+
+  class mw_mysql extends mw_sgbd{
+
+    public function name(){
+      return "MySql";
+    }
+
+    public function default_params(){
+      return array(
+        "host" => "localhost",
+        "base" => "mtweb",
+        "user" => "",
+        "password" => ""
+      );
+    }
+
+    public function validate_extention(){
+      return function_exists("mysql_connect");
+    }
+
+    public function authentication_required(){
+      return true;
+    }
+
+    public function connect($host, $base, $user, $password){
+      $this->link = @mysql_connect($host, $user, $password);
+      if(!$this->link) throw new Exception($this->exception_out("Impossible d'etablir une connection au serveur"));
+      @mysql_query("SET NAMES 'utf8'");
+      if($base){
+        $connected = @mysql_select_db($base, $this->link);
+        if(!$connected) throw new Exception($this->exception_out("Impossible de selectioner la base ".$base));
+      }
+      return true;
+    }
+
+    public function select_db($db_name){\r
+      $this->base = $db_name;\r
+      if(!$this->link) $this->connect($this->host, $this->base, $this->user, $this->password);\r
+      return $this->query("USE ".$db_name);\r
+    }
+
+    public function desc_table($table_name){
+      $table_name = $this->replace_prefixes($table_name);
+      $sql = "SELECT * from information_schema.columns where table_name='".$table_name."'";
+      $rst = $this->query($sql);
+      $desc = array(
+        "name" => $table_name,
+        "attributs" => array()
+      );
+      try{
+        while($v_rst = $this->fetch_assoc($rst)){\r
+          $desc["attributs"][$v_rst["COLUMN_NAME"]] = array(
+            "name" => $v_rst["COLUMN_NAME"],
+            "prymary_key" => $v_rst["COLUMN_KEY"] == "PRI" ? true : false,
+            "auto_increment" => $v_rst["EXTRA"] == "auto_increment" ? true : false
+          );
+        }\r
+        $this->free_result($rst);
+      }
+      catch(Exception $e){
+        throw new Exception($this->exception_out("Impossible de lire la description de la table"));
+      }
+      return $desc;
+    }
+
+    public function table_exists($table_name){
+      $table_name = $this->replace_prefixes($table_name);\r
+      if(!$this->link) $this->connect($this->host, $this->base, $this->user, $this->password);\r
+      $EXISTS = false;
+      try{
+        $rst = $this->query("SHOW TABLES");
+        while($v_rst = mysql_fetch_row($rst)){\r
+          if($v_rst[0] == $table_name){
+            $EXISTS = true;
+            break;
+          }\r
+        }\r
+        $this->free_result($rst);
+      }
+      catch(Exception $e){
+        throw new Exception($this->exception_out("Impossible de savoir si la table existe"));
+      }
+      return $EXISTS;
+    }
+
+    public function field_exists($table_name, $field_name){
+      $table_name = $this->replace_prefixes($table_name);
+      if(!$this->link) $this->connect($this->host, $this->base, $this->user, $this->password);\r
+      if(!($desc = $this->desc_table($table_name))){
+        throw new Exception($this->exception_out("Impossible de lire la description de la table"));
+      }
+      $EXISTS = false;
+      foreach($desc["attributs"] as $attribut_name => $attribut){
+        if($field_name == $attribut_name){
+          $EXISTS = true;
+          break;
+        }
+      }
+      return $EXISTS;
+    }
+
+    public function query($query_string){
+      $query_string = $this->replace_prefixes($query_string);\r
+      if(!$this->link) $this->connect($this->host, $this->base, $this->user, $this->password);\r
+      $result = @mysql_query($query_string, $this->link);\r
+      if(!$result) throw new Exception($this->exception_out("Syntaxe invalide dans une requete"));\r
+      return $result;\r
+    }
+
+    public function fetch_assoc($rst){
+      if($this->link){
+        if($rst){
+          return mysql_fetch_assoc($rst);
+        }
+        else throw new Exception($this->exception_out("fetch_assoc sans result handler"));
+      }
+      else throw new Exception($this->exception_out("fetch_assoc sans connexion"));
+    }
+
+    public function insert_id(){
+      if($this->link){
+        return mysql_insert_id($this->link);
+      }
+      else throw new Exception($this->exception_out("insert_id sans connexion"));
+    }
+
+    public function free_result($rst){
+      if($this->link){
+        if($rst){
+          return mysql_free_result($rst);
+        }
+        else throw new Exception($this->exception_out("free_result sans result handler"));
+      }
+      else throw new Exception($this->exception_out("free_result sans connexion"));
+    }
+
+    public function close(){
+      if($this->link) return mysql_close($this->link);
+      return true;
+    }
+
+    public function exception_out($message){\r
+      return "[erreur] mysql : ".$message;\r
+    }
+
+  }