fixed NPE in AuditManager

mybatis-flex-core/src/main/java/com/mybatisflex/core/audit/AuditManager.java

@@ -76,9 +76,9 @@ public class AuditManager {
         } finally {
             auditMessage.setElapsedTime(clock.getTick() - auditMessage.getExtTime());
             auditMessage.setQuery(boundSql.getSql());
-
             Object parameter = boundSql.getParameterObject();
 
+
             /** parameter 的组装请查看 getNamedParams 方法
              * @see ParamNameResolver#getNamedParams(Object[])
              */

mybatis-flex-core/src/main/java/com/mybatisflex/core/mybatis/FlexStatementHandler.java

@@ -63,7 +63,7 @@ public class FlexStatementHandler implements StatementHandler {
                 throw new ExecutorException("Unknown statement type: " + ms.getStatementType());
         }
 
-        this.boundSql = boundSql;
+        this.boundSql = delegate.getBoundSql();
     }
 
     @Override