extjs spring tree ajax

CREATE SEQUENCE tree_seq MINVALUE 1 MAXVALUE 999999999999999999999999999 START WITH 1 INCREMENT BY 1 CACHE 20; create table tree ( id number primary key, pid number, name varchar2(50), pin number ) ALTER TABLE tree ADD CONSTRAINT FK_PARENTID FOREIGN KEY(pID) REFERENCES tree (ID); insert into tree (id,pid,name,pin) values(tree_seq.nextval,,'根节点',1);