無限階層tree
3132 ワード
public class XTree{
//
public static void addNode(String pid,String name) {
QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource());
//
String sql = "select * from category where id=?";
Category parent = (Category)runner.query(sql,pid,new BeanHandler(Category.class));
//
Category son = new Category();
son.setId(UUID.randomUUID().toString());
son.setName(name);
son.setLft(parent.getLft());
son.setRgt(parent.getLft()+1);
//
sql = "update category set lft=lft+2 where lft>=?";
runner.update(sql,parent.getRgt());
sql = "update category set rgt=rgt+2 where rgt>=?"
runner.update(sql,parent.getRgt());
//
sql = "insert into category(id,name,lft,rgt) values(?,?,?,?)";
Object[] params = {son.getId(),son.getName(),son.getLft(),son.getRgt()};
runner.update(sql,params);
}
//
public static List<Category> findAllParent(int lft,int rgt) {
QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource());
String sql = "select * from category where lft<? and rgt>? order by lft";
Object[] params = {lft,rgt};
return runner.update(sql,params,new BeanListHandler(Category.class));
}
}