增加pigx-code模块，使用dynamic-datasource实现多数据源

pigx-visual/pigx-code/src/main/resources/template/Mapper.xml.vm

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+  ~
+  ~      Copyright (c) 2018-2025, lengleng All rights reserved.
+  ~
+  ~  Redistribution and use in source and binary forms, with or without
+  ~  modification, are permitted provided that the following conditions are met:
+  ~
+  ~ Redistributions of source code must retain the above copyright notice,
+  ~  this list of conditions and the following disclaimer.
+  ~  Redistributions in binary form must reproduce the above copyright
+  ~  notice, this list of conditions and the following disclaimer in the
+  ~  documentation and/or other materials provided with the distribution.
+  ~  Neither the name of the pig4cloud.com developer nor the names of its
+  ~  contributors may be used to endorse or promote products derived from
+  ~  this software without specific prior written permission.
+  ~  Author: lengleng (wangiegie@gmail.com)
+  ~
+  -->
+
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="${package}.${moduleName}.mapper.${className}Mapper">
+
+  <resultMap id="${classname}Map" type="${package}.${moduleName}.entity.${className}">
+    #foreach($column in $columns)
+      #if($column.lowerAttrName==$pk.lowerAttrName)
+        <id property="${pk.lowerAttrName}" column="${pk.columnName}"/>
+      #else
+        <result property="${column.lowerAttrName}" column="${column.columnName}"/>
+      #end
+    #end
+  </resultMap>
+</mapper>