Initial release of Discourse

lib/sql_builder.rb

@@ -0,0 +1,48 @@
+class SqlBuilder
+
+  def initialize(template)
+    @args = {}
+    @sql = template
+    @sections = {}
+  end
+
+  [:set, :where2,:where,:order_by,:limit,:left_join,:join,:offset].each do |k|
+    define_method k do |data, args = {}|
+      @args.merge!(args)
+      @sections[k] ||= []
+      @sections[k] << data
+      self
+    end
+  end
+
+  def exec(args = {})
+    sql = @sql.dup
+    @args.merge!(args)
+
+    @sections.each do |k,v|
+      joined = nil
+      case k 
+      when :where, :where2
+        joined = "WHERE " << v.join(" AND ")
+      when :join
+        joined = v.map{|v| "JOIN " << v }.join("\n")
+      when :left_join
+        joined = v.map{|v| "LEFT JOIN " << v }.join("\n")
+      when :limit
+        joined = "LIMIT " << v.last.to_s
+      when :offset
+        joined = "OFFSET " << v.last.to_s
+      when :order_by
+        joined = "ORDER BY " << v.join(" , ")
+      when :set
+        joined = "SET " << v.join(" , ")
+      end
+
+      sql.sub!("/*#{k}*/", joined)
+    end
+
+    ActiveRecord::Base.exec_sql(sql,@args)
+  end
+
+
+end