嵌套表用法詳解（PLSQL）
嵌套表
嵌套表是一種類似於索引表的結構，也可以用於保存多個數據，而且也可以保存復合類型的數據
嵌套表指的是一個數據表定義事同時加入了其他內部表的定義，這一概念是在oracle 8中引入的，它們可以使用SQL進行訪問，也可以進行動態擴展。
創建表指定嵌套表存儲空間名稱
Create table 表名稱（
字段名稱 類型
……
嵌套表字段名稱 嵌套表類型
）NESTED TABLE 嵌套表字段名稱 STORE AS 存儲空間名稱；
定義部門表
DROP TABLE department
Create table department(
Did number,
Deptname varchar(30) not null,
Projects project_nested,
Constraint pk_did primary key(did)
)NESTED TABLE projects STORE AS projects_nested_table;
創建新的對象類型
Create type 類型名稱 AS OBJECT(
列名稱 數據類型，
列名稱 數據類型，
……
列名稱 數據類型
);
/
範例：創建一個表示項目類型的對象
Create or replace type kingsql_type as object(
Projectid number,
Projectname varchar(50),
Projectfunds number,
Pubdate date
);
/
CREATE OR REPLACE TYPE kingsql_type AS OBJECT
projectid NUMBER ,
projectname VARCHAR(50),
projectfunds NUMBER ,
pubdate DATE
) ;
定義嵌套表類型——project_nested
CREATE OR REPLACE TYPE kingsql_nested AS TABLE OF kingsql_type NOT NULL ;
CREATE TABLE department_01 (
did NUMBER ,
deptname VARCHAR(50) NOT NULL ,
qt_column kingsql_nested
) NESTED TABLE qt_column STORE AS kingsql_nested_t1
projectid NOT NULL ,
projectname NOT NULL ,
projectfunds NOT NULL ,
pubdate NOT NULL)) ;
嵌套表插入數據
insert into department_01 values(
1,--第一列
‘hehe1‘,--第二列
kingsql_nested(kingsql_type(1,‘hehe1‘,1,sysdate),kingsql_type(11,‘hehe11‘,11,sysdate))); 第三列第一行/第三列第二行
插入數據
declare
v1 kingsql_nested:=kingsql_nested(kingsql_type(2,‘haha2‘,2,sysdate));
begin
insert into department_01
values(1,‘hehe1‘,kingsql_nested(kingsql_type(1,‘hehe1‘,1,sysdate),kingsql_type(11,‘hehe11‘,11,sysdate)));
insert into department_01 values(2,‘haha2‘,v1);
end;
/
查詢嵌套表數據
select * from the(select department_01.qt_column from department_01 where did=1);
PROJECTID PROJECTNAME PROJECTFUNDS PUBDATE
---------- -------------------------------------------------- ------------ -------------------
1 hehe1 1 2018-05-21 14:35:32
11 hehe11 11 2018-05-21 14:35:32
select * from the(select department_01.qt_column from department_01 where did=2);
PROJECTID PROJECTNAME PROJECTFUNDS PUBDATE
---------- -------------------------------------------------- ------------ -------------------
2 haha2 2 2018-05-21 14:35:32
select * from the(select department_01.qt_column from department_01 where did=1) where projectid=1;
PROJECTID PROJECTNAME PROJECTFUNDS PUBDATE
---------- -------------------------------------------------- ------------ -------------------
1 hehe1 1 2018-05-21 14:35:32
直接插入嵌套表數據
insert into the(select department_01.qt_column from department_01 where did=1) values(111,‘hehe111‘,111,sysdate);
Select * from the(select department_01.qt_column from department_01 where did=1);
循環插入一百行
declare
x number:=3;
begin
for x in 3..103 loop
insert into the(select department_01.qt_column from department_01 where did=2) values(x,‘hehe‘,111,sysdate);
end loop;
commit;
end;
直接更新嵌套表數據
update the(select department_01.qt_column from department_01 where did=1) set projectid=1111 where projectid=1;
commit;
select * from the(select department_01.qt_column from department_01 where did=1)
直接刪除嵌套表數據
delete the(select department_01.qt_column from department_01 where did=1) where projectid=1111;
commit;
select * from the(select department_01.qt_column from department_01 where did=1);
DROP TABLE department_01 PURGE ; 從回收站刪除
嵌套表用法詳解（PLSQL）