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  • 嵌套表用法详解(PLSQL)

    嵌套表

    wps48AA.tmp

    嵌套表是一种类似于索引表的结构,也可以用于保存多个数据,而且也可以保存复合类型的数据

    嵌套表指的是一个数据表定义事同时加入了其他内部表的定义,这一概念是在oracle 8中引入的,它们可以使用SQL进行访问,也可以进行动态扩展。

    创建表指定嵌套表存储空间名称

    Create table 表名称(

    字段名称 类型

    ……

    嵌套表字段名称 嵌套表类型

    )NESTED TABLE 嵌套表字段名称 STORE AS 存储空间名称;

    定义部门表

    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;

    创建新的对象类型

    Create type 类型名称 AS OBJECT(

    列名称 数据类型,

    列名称 数据类型,

    ……

    列名称 数据类型

    );

    /

    范例:创建一个表示项目类型的对象

    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

    ) ;

    定义嵌套表类型——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)) ;

    嵌套表插入数据

    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

    插入数据

    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;

    /

    查询嵌套表数据

    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

    直接插入嵌套表数据

    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);

    循环插入一百行

    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;

    直接更新嵌套表数据

    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)

    直接删除嵌套表数据

    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 ; 从回收站删除

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  • 原文地址:https://www.cnblogs.com/kawashibara/p/9094052.html
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