Add Builder::hasView('view_name') to check for existence of views

src/Illuminate/Database/Schema/Builder.php

@@ -74,6 +74,21 @@ public function hasTable($table)
         )) > 0;
     }
 
+    /**
+     * Determine if the given view exists.
+     *
+     * @param  string  $view
+     * @return bool
+     */
+    public function hasView($view)
+    {
+        $view = $this->connection->getTablePrefix().$view;
+
+        return count($this->connection->select(
+            $this->grammar->compileViewExists(), [$view]
+        )) > 0;
+    }
+
     /**
      * Determine if the given table has a given column.
      *

src/Illuminate/Database/Schema/Grammars/MySqlGrammar.php

@@ -35,6 +35,16 @@ public function compileTableExists()
         return 'select * from information_schema.tables where table_schema = ? and table_name = ?';
     }
 
+    /**
+     * Compile the query to determine if a view exists.
+     *
+     * @return string
+     */
+    public function compileViewExists()
+    {
+        return $this->compileTableExists();
+    }
+
     /**
      * Compile the query to determine the list of columns.
      *

src/Illuminate/Database/Schema/Grammars/PostgresGrammar.php

@@ -46,6 +46,16 @@ public function compileTableExists()
         return 'select * from information_schema.tables where table_schema = ? and table_name = ?';
     }
 
+    /**
+     * Compile the query to determine if a view exists.
+     *
+     * @return string
+     */
+    public function compileViewExists()
+    {
+        return $this->compileTableExists();
+    }
+
     /**
      * Compile the query to determine the list of columns.
      *

src/Illuminate/Database/Schema/Grammars/SQLiteGrammar.php

@@ -33,6 +33,16 @@ public function compileTableExists()
         return "select * from sqlite_master where type = 'table' and name = ?";
     }
 
+    /**
+     * Compile the query to determine if a view exists.
+     *
+     * @return string
+     */
+    public function compileViewExists()
+    {
+        return "select * from sqlite_master where type = 'view' and name = ?";
+    }
+
     /**
      * Compile the query to determine the list of columns.
      *

src/Illuminate/Database/Schema/Grammars/SqlServerGrammar.php

@@ -38,6 +38,16 @@ public function compileTableExists()
         return "select * from sysobjects where type = 'U' and name = ?";
     }
 
+    /**
+     * Compile the query to determine if a view exists.
+     *
+     * @return string
+     */
+    public function compileViewExists()
+    {
+        return "select * from sysobjects where type = 'V' and name = ?";
+    }
+
     /**
      * Compile the query to determine the list of columns.
      *

src/Illuminate/Database/Schema/MySqlBuilder.php

@@ -19,6 +19,21 @@ public function hasTable($table)
         )) > 0;
     }
 
+    /**
+     * Determine if the given view exists.
+     *
+     * @param  string  $view
+     * @return bool
+     */
+    public function hasView($view)
+    {
+        $view = $this->connection->getTablePrefix().$view;
+
+        return count($this->connection->select(
+            $this->grammar->compileViewExists(), [$this->connection->getDatabaseName(), $view]
+        )) > 0;
+    }
+
     /**
      * Get the column listing for a given table.
      *

src/Illuminate/Database/Schema/PostgresBuilder.php

@@ -21,6 +21,23 @@ public function hasTable($table)
         )) > 0;
     }
 
+    /**
+     * Determine if the given view exists.
+     *
+     * @param  string  $view
+     * @return bool
+     */
+    public function hasView($view)
+    {
+        list($schema, $view) = $this->parseSchemaAndTable($view);
+
+        $view = $this->connection->getTablePrefix().$view;
+
+        return count($this->connection->select(
+            $this->grammar->compileTableExists(), [$schema, $view]
+        )) > 0;
+    }
+
     /**
      * Drop all tables from the database.
      *

tests/Database/DatabaseSchemaBuilderTest.php

@@ -26,6 +26,19 @@ public function testHasTableCorrectlyCallsGrammar()
         $this->assertTrue($builder->hasTable('table'));
     }
 
+    public function testHasViewCorrectlyCallsGrammar()
+    {
+        $connection = m::mock('Illuminate\Database\Connection');
+        $grammar = m::mock('stdClass');
+        $connection->shouldReceive('getSchemaGrammar')->andReturn($grammar);
+        $builder = new Builder($connection);
+        $grammar->shouldReceive('compileViewExists')->once()->andReturn('sql');
+        $connection->shouldReceive('getTablePrefix')->once()->andReturn('prefix_');
+        $connection->shouldReceive('select')->once()->with('sql', ['prefix_view'])->andReturn(['prefix_view']);
+
+        $this->assertTrue($builder->hasView('view'));
+    }
+
     public function testTableHasColumns()
     {
         $connection = m::mock('Illuminate\Database\Connection');