src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
private static List<Element> generateCommColumns(List<IntrospectedColumn> columns, String prefix, boolean bracket, int type) {
        return generateCommColumns(columns, prefix, bracket, type, false);
    }
private static List<Element> generateCommColumns(List<IntrospectedColumn> columns, String prefix, boolean bracket, int type) {
        return generateCommColumns(columns, prefix, bracket, type, false);
    }
通用遍历columns
@param columns
@param prefix
@param bracket
@param type    1:key,2:value,3:set
@return