src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
public static List<Element> generateUpsertSets(List<IntrospectedColumn> columns, String prefix) {
        return generateCommColumns(columns, prefix, false, 3, true);
    }
public static List<Element> generateUpsertSets(List<IntrospectedColumn> columns, String prefix) {
        return generateCommColumns(columns, prefix, false, 3, true);
    }
生成sets Ele (upsert)
@param columns
@param prefix
@return