搞个MyBatis XML生成器，解决单表多条件、更新、删除操作的Mapper配置

public interface IMybatisXMLElement<T extends IMybatisXMLElement> {

String getElementTag();

/**
* 搞定文本 addElement(new TextElement("SELECT *"))
* 搞定If addElement(new IfElement("username != null"));
* 搞定 Where addElement(new WhereElement());
* ...
*
* @param element
*/
void addElement(T element);

List<T> getElements();

String toText();

void beginTag(Writer output);

void writeBody(Writer output);

void endTag(Writer output);
}