本文没有对PL/SQL中的东西有什么说明,只是简单的举了几个例子,希望对大家有用!
作者:peace.zhao关于 游标 if,for 的例子
create or replace procedure peace_if
is
cursor var_c is select * from grade;
begin
for temp in var_c loop
if temp.course_name = 'OS' then
dbms_output.put_line('Stu_name = '||temp.stu_name);
elsif temp.course_name = 'DB' then
dbms_output.put_line('DB');
else
dbms_output.put_line('feng la feng la ');
end if;
end loop;
end;
---关于游标 for,case 的例子1
create or replace procedure peace_case1
is
cursor var_c is select * from test_case;
begin
for temp in var_c loop
case temp.vol
when 1 then
dbms_output.put_line('haha1');
when 2 then
dbms_output.put_line('haha2');
when 3 then
dbms_output.put_line('haha3');
when 4 then
dbms_output.put_line('haha4');
else
dbms_output.put_line('qita');
end case ;
end loop;
end;
---关于游标 for,case 的例子2
create or replace procedure peace_case2
is
cursor var_c is select * from test_case;
begin
for temp in var_c loop
case
when temp.vol=1 then
dbms_output.put_line('haha1');
when temp.vol=2 then
dbms_output.put_line('haha2');
when temp.vol=3 then
dbms_output.put_line('haha3');
when temp.vol=4 then
dbms_output.put_line('haha4');
else
dbms_output.put_line('qita');
end case ;
end loop;
end;
---关于for 循环的例子
create or replace procedure peace_for
is
sum1 number :=0;
temp varchar2(500);
begin
for i in 1..9 loop
temp := '';
for j in 1 .. i
loop
sum1 := i * j;
temp := temp||to_char(i) || ' * ' ||to_char(j) ||' = ' ||to_char(sum1) ||' ';
end loop;
dbms_output.put_line(temp );
end loop;
end;
---关于 loop循环的例子
create or replace procedure peace_loop
is
sum1 number := 0;
temp number :=0 ;
begin
loop
exit when temp >= 10 ;
sum1 := sum1+temp;
temp := temp +1;
end loop;
dbms_output.put_line(sum1 );
end;
---关于游标和loop循环的例子
create or replace procedure loop_cur
is
stu_name varchar2(100);
course_name varchar2(100);
cursor var_cur is select * from grade ;
begin
open var_cur;
loop
fetch var_cur into stu_name,course_name;
exit when var_cur%notfound;
dbms_output.put_line(stu_name|| course_name);
end loop;
close var_cur;
end;
---关于异常处理的例子
create or replace procedure peace_exp(in1 in varchar2)
is
c_n varchar2(100);
begin
select course_name into c_n from grade where stu_name = in1;
dbms_output.put_line(c_n);
exception
when no_data_found
then
dbms_output.put_line('try');
when TOO_MANY_ROWS
then
dbms_output.put_line('more');
end;
---关于异常处理的例子2
create or replace procedure peace_insert ( c_n in varchar2)
is
error EXCEPTION;
begin
if c_n = 'OK'
then
insert into course (course_name) values (c_n);
elsif c_n = 'NG' then
insert into course (course_name) values (c_n);
raise error;
else
Dbms_Output.put_line('c_n' || c_n);
end if;
commit;
exception
when error then
rollback;
Dbms_Output.put_line('ERRO');
end;
---关于包的例子 定义包
create or replace package peace_pkg
as
function test1(in1 in varchar2)
return number;
procedure test2 (in2 in varchar2);
end peace_pkg;
---关于包的例子 定义包体
create or replace package body peace_pkg
as
function test1(in1 in varchar2)
return number
as
temp number;
begin
temp := 0;
return temp;
end;
procedure test2 (in2 in varchar2)
is
begin
dbms_output.put_line(in2);
end;
end peace_pkg;

oracle asm指的是“自动存储管理”,是一种卷管理器,可自动管理磁盘组并提供有效的数据冗余功能;它是做为单独的Oracle实例实施和部署。asm的优势:1、配置简单、可最大化推动数据库合并的存储资源利用;2、支持BIGFILE文件等。

方法:1、利用“select*from user_indexes where table_name=表名”语句查询表中索引;2、利用“select*from all_indexes where table_name=表名”语句查询所有索引。

在oracle中,可以利用“TO_SINGLE_BYTE(String)”将全角转换为半角;“TO_SINGLE_BYTE”函数可以将参数中所有多字节字符都替换为等价的单字节字符,只有当数据库字符集同时包含多字节和单字节字符的时候有效。

在Oracle中,可利用lsnrctl命令查询端口号,该命令是Oracle的监听命令;在启动、关闭或重启oracle监听器之前可使用该命令检查oracle监听器的状态,语法为“lsnrctl status”,结果PORT后的内容就是端口号。

在oracle中,可以利用“drop sequence sequence名”来删除sequence;sequence是自动增加数字序列的意思,也就是序列号,序列号自动增加不能重置,因此需要利用drop sequence语句来删除序列。

在oracle中,可以利用“select ... From all_tab_columns where table_name=upper('表名') AND owner=upper('数据库登录用户名');”语句查询数据库表的数据类型。

方法:1、利用“LOWER(字段值)”将字段转为小写,或者利用“UPPER(字段值)”将字段转为大写;2、利用“REGEXP_LIKE(字符串,正则表达式,'i')”,当参数设置为“i”时,说明进行匹配不区分大小写。

方法:1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数;2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Atom editor mac version download
The most popular open source editor

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
