接上文 Oracle学习笔记
PL/SQL 数据分页
Java调用无返回值的存储过程
create table book
(
bookId number,
bookName varchar2(50),
publishHouse varchar2(50)
);create or replace procedure pro_page
(BookId in number,BookName in varchar2,PublishHouse in varchar2)is
begin
insert into book values(BookId,BookName,PublishHouse);
end;Java中调用存储过程(无返回值)
CallabelStatement cs = connection.prepareCall(“{call pro(?,?,?)}”);
cs.setInt(1,10);
cs.setString(2,”笑傲江湖”);
cs.setString(3,”人民出版社”);
cs.execute();Java调用有返回值的存储过程
create or replace procedure pro1
(no in number,name out varchar2)is
begin
select ename into name from SCOTT.Emp where empno =no;
end;Java中调用存储过程(有返回值)
CallabelStatement cs = connection.prepareCall(“{call pro1(?,?)}”);
cs.setInt(1,7788);
cs.registerOutParameter(2,oracle.jdbc.OracleTypes.VARCHAR);
cs.execute();
String name = cs.getString(2);//取出返回值返回结果集的存储过程
Step1.创建一个包，在包中定义类型test_cursor
create or replace package testpackage as
type test_cursor is refcursor;
end testpackage;Step2.创建过程
create or replace procedure pro(no in number,v_cursor out testpackage.test_cursor)
begin open v_cursor for
select * from SCOTT.emp where deptno =no;
end;Step3.在Java中调用
CallabelStatement cs = connection.prepareCall(“{call pro(?,?)}”);
cs.setInt(1,10);
cs.registerOutParameter(2,oracle.jdbc.OracleTypes.CURSOR);
cs.execute();
ResultSetrs = (ResultSet)cs.getObject(2);
while(rs.next()){
}
分页过程
select t1.*,rownum rn from(select*fromSCOTT.Student) t1;--按照编号排序
select t1.*,rownum rn from(select*fromSCOTT.Student) t1 where rownum<10;
select * from(select t1.*,rownum rn from(select*fromSCOTT.Student) t1 where rownum<=20)where rn >=11;--查询第11-20条数据~~~~模板
select * from(select t1.*,rownum rn from(select*fromSCOTT.EMP orderby sal) t1 where rownum<=9)where rn >=5;--按照sal排序
create or replace package testpackage as
type test_cursor is refcursor; --创建包，声明游标
end testpackage;
create or replace procedure fenye
(tablename invarchar2,
Pagesize in number,
Pagenow in number,
myrows out number,--总记录数
myPageCount out number,--总页数
my_cursor out testpackage.test_cursor--返回的记录集
)is
v_sql varchar2(1000);
v_begin number:=(Pagenow-1)*Pagesize+1;
v_end number:=Pagenow*Pagesize;
begin
v_sql :='select* from (select t1.*,rownum rn from (select * from '||tablename||'order by sal) t1 where rownum <= '||v_end||')where rn >= '||v_begin;
open my_cursor for v_sql;
v_sql :='selectcount(*) from '|| tablename;
execute immediate v_sql into myrows;
if mod(myrows,Pagesize)=0 then
myPageCount =myrows/Pagesize;
else
myPageCount =myrows/Pagesize+1;
endif;
end;
Java调用
CallabelStatement cs = connection.prepareCall(“{call fenye(?,?,?,?,?,?)}”);//调用存储过程
cs.setString(1,”SCOTT.EMP”);//设置表名
cs.setInt(2,5);//设置Pagesize
cs.setInt(3,1);//设置Pagenow
cs.registerOutParameter(4,oracle.jdbc.OracleTypes.INTEGER);//注册总记录数
cs.registerOutParameter(5,oracle.jdbc.OracleTypes.INTEGER);// 注册总页数
cs.registerOutParameter(6,oracle.jdbc.OracleTypes.INTEGER);// 注册返回结果集
cs.execute();
introwNum = cs.getInt(4);//
intpageCount = cs.getInt(5);
ResultSetrs = (ResultSet)cs.getObject(6);//结果集
异常处理
预定义异常no_data_found
declare
v_name SCOTT.EMP.ENAME%type;
begin
select ename intov_name from SCOTT.EMP where empno = &no;
dbms_output.put_line('名字：'||v_name);
exception
when no_data_found then
dbms_output.put_line('编号没有');
end;
预定义异常case_not_found
create or replace procedure pro(no number)is
v_sal SCOTT.EMP.SAL%type;
begin
select sal intov_sal from SCOTT.EMP where empno =no;
case
when v_sal <1000then
update SCOTT.EMP set sal = sal +100 where empno =no;
when v_sal <2000then
update SCOTT.EMP set sal = sal +200 where empno =no;
endcase;
exception
when case_not_found then
dbms_output.put_line('case语句没有与'||v_sal||'相匹配的条件');
end;
预定义异常cursor_already_open
declare
cursor emp_cursor is select ename,sal from SCOTT.EMP;
begin
open emp_cursor;
for emp_record in emp_cursor
loop
dbms_output.put_line(emp_record.ename);
end loop;
exception
when cursor_already_open then
dbms_output.put_line('游标已经被打开');
end;
预定义异常dup_val_on_index
begin
insert into SCOTT.DEPT values(10,'公安部','北京');
exception
when dup_val_on_index then
dbms_output.put_line('在deptno列上不能出现重复值');
end;
预定义异常invalid_cursor
declare
cursor emp_cursor is select ename,sal from SCOTT.EMP;
emp_record emp_cursor%rowtype;
begin
--open emp_cursor;--打开游标
fetch emp_cursor into emp_record;
dbms_output.put_line(emp_record.ename);
close emp_cursor;
exception
when invalid_cursor then
dbms_output.put_line('请检查游标是否已经打开');
end;
预定义异常invalid_number
begin
update SCOTT.EMP set sal = sal +'lll';
exception
when invalid_number then
dbms_output.put_line('无效数字');
end;预定义异常too_many_rows
declare
v_name SCOTT.EMP.ENAME%type;
begin
select ename into v_name from SCOTT.EMP;
exception
when too_many_rows then
dbms_output.put_line('返回了多行');
end;
预定义异常zero_divide
被除数为0时触发。
预定义异常value_error
declare
v_name varchar2(2);
begin
select ename intov_name from SCOTT.EMP where empno = &no;
dbms_output.put_line(v_name);
exception
when value_error then
dbms_output.put_line('变量尺寸不足');
end;
预定义异常login_denied
用户非法登录时触发。
预定义异常not_logged_on
如果用户没有登录就执行dml就会触发。
预定义异常storage_error
如果超出了内存空间或是内存被破坏就触发。
预定义异常timeout_on_resorce
如果Oracle在等待资源时，出现了超时就触发。
自定义异常
create or replace procedure pro_exception_test(no number)
is
my_exception exception;--自定义异常
begin
update SCOTT.EMP set sal = sal +100 where empno =no;
if sql%not found then
raise my_exception;
endif;
exception when my_exception then
dbms_output.put_line('没有做任何更新');
end;
视图与表的区别
① 表需要占用磁盘空间，视图不需要
② 视图不能添加索引
③ 使用视图可以简化复杂查询
④ 视图有利于提高安全性
创建视图
create view my_view as select * fromSCOTT.EMP where sal <1000;可以在最后带上 with read only
删除视图
drop view my_view
