src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
public static List<Element> generateUpsertValues(List<IntrospectedColumn> columns, String prefix, boolean bracket) {
        return generateCommColumns(columns, prefix, bracket, 2, true);
    }
public static List<Element> generateUpsertValues(List<IntrospectedColumn> columns, String prefix, boolean bracket) {
        return generateCommColumns(columns, prefix, bracket, 2, true);
    }
生成values Ele (upsert)
@param columns
@param prefix
@param bracket
@return