解决MyBatis XML配置文件加载bug：refid 'SAD02.SAD02_COL'缺失

### Eclipse Workspace Patch 1.0
#P MyBatisCus
Index: src/org/apache/ibatis/builder/xml/XMLMapperBuilder.java
===================================================================
--- src/org/apache/ibatis/builder/xml/XMLMapperBuilder.java (revision 5886)
+++ src/org/apache/ibatis/builder/xml/XMLMapperBuilder.java (working copy)
@@ -19,6 +19,8 @@
   private MapperBuilderAssistant builderAssistant;
   private Map<String, XNode> sqlFragments;
   private String resource;
+  // Mapped Statements collection already contains
+  private boolean ignoreAlreadyMapped = false;
 
   public XMLMapperBuilder(Reader reader, Configuration configuration, String resource, Map<String, XNode> sqlFragments, String namespace) {
     this(reader, configuration, resource, sqlFragments);
@@ -32,7 +34,16 @@
     this.sqlFragments = sqlFragments;
     this.resource = resource;
   }
-
+  
+  public XMLMapperBuilder(Reader reader, Configuration configuration, String resource, Map<String, XNode> sqlFragments,boolean ignoreAlreadyMapped) {
+      super(configuration);
+      this.builderAssistant = new MapperBuilderAssistant(configuration, resource);
+      this.parser = new XPathParser(reader, true, configuration.getVariables(), new XMLMapperEntityResolver());
+      this.sqlFragments = sqlFragments;
+      this.resource = resource;
+      this.ignoreAlreadyMapped = ignoreAlreadyMapped;
+    }
+