複雜的資料型別
1.行記錄型別
%rowtype
代表一行的記錄結構
%前是表的名稱
便於儲存表中的一行
對於這種變數的呼叫,就像我們正常去獲取表中一行裡的值一樣
declare
v1 dept%rowtype;
begin
select * into v1 from dept where deptno=10;
dbms_output.put_line(v1.deptno);
dbms_output.put_line(v1.dname);
dbms_output.put_line(v1.loc);
dbms_output.put_line(v1.deptno||' '||v1.dname||' '||v1.loc);
end;
/
2.PLSQL表 集合 陣列
確切的講,PLSQL表更像一個有主鍵約束(索引)的表,通過主鍵來訪問資料
包含兩個要素:
主鍵(元素的編號),資料型別為binary_integer
成員或者叫元素,可以為簡單的變數,也可以是複雜的變數
簡單變數的例子
declare
type t1 is table of emp.ename%type index by binary_integer;
type t2 is table of date index by binary_integer;
v1 t1;
v2 t2;
begin
v1(1):='SCOTT';
v2(1):=sysdate;
select ename,hiredate into v1(2),v2(2) from emp where empno=7900;
dbms_output.put_line(v1(1)||' '||v1(2));
dbms_output.put_line(v2(1)||' '||v2(2));
end;
/
複雜變數的例子
declare
type t1 is table of dept%rowtype index by binary_integer;
v1 t1;
begin
select * into v1(10) from dept where deptno=10;
select * into v1(20) from dept where deptno=20;
select * into v1(30) from dept where deptno=30;
select * into v1(40) from dept where deptno=40;
dbms_output.put_line(v1(10).deptno||' '||v1(10).dname||' '||v1(10).loc);
dbms_output.put_line(v1(20).deptno||' '||v1(20).dname||' '||v1(20).loc);
dbms_output.put_line(v1(30).deptno||' '||v1(30).dname||' '||v1(30).loc);
dbms_output.put_line(v1(40).deptno||' '||v1(40).dname||' '||v1(40).loc);
end;
/
PLSQL TABLE的屬性
PRIOR:指定成員之前那個成員的編號
NEXT:指定成員之後那個成員的編號
COUNT:統計PLSQL TABLE中有多少個成員
FIRST:第一個成員編號是多少
LAST:最後一個編號是多少
DELETE:從PLSQL TABLE裡刪除成員,不寫成員編號的話,就是刪除全部成員
EXISTS:判斷成員編號是否PLSQL TABLE中
declare
type t1 is table of dept%rowtype index by binary_integer;
v1 t1;
n1 number(3);
n2 number(3);
n3 number(3);
n4 number(3);
n5 number(3);
n6 number(3);
n7 number(3);
begin
select * into v1(10) from dept where deptno=10;
select * into v1(20) from dept where deptno=20;
select * into v1(30) from dept where deptno=30;
select * into v1(40) from dept where deptno=40;
n1:=v1.first;
n2:=v1.last;
n3:=v1.count;
n4:=v1.prior(20);
n5:=v1.next(20);
dbms_output.put_line(n1||' '||n2||' '||n3||' '||n4||' '||n5);
v1.delete(40);
n6:=v1.count;
dbms_output.put_line(n6);
end;
/
declare
type t1 is table of emp.ename%type index by binary_integer;
type t2 is table of date index by binary_integer;
v1 t1;
v2 t2;
begin
v1(1):='SCOTT';
v2(1):=sysdate;
select ename,hiredate into v1(7),v2(7) from emp where empno=7900;
select ename,hiredate into v1(12),v2(12) from emp where empno=7788;
for i in 1..10 loop
if v1.exists(i) then
dbms_output.put_line(v1(i));
end if;
if v2.exists(i) then
dbms_output.put_line(v2(i));
end if;
end loop;
end;
/