一.存储过程
相对于直接使用SQL 语句，在应用程序中直接调用存储过程有以下好处：
(1)减少网络通信量。
(2)执行速度更快。创建时候编译,解析,安全检查和优化,后来不需要重复编译,存在内存之中,直接调用效率高
(3)更强的适应性。
(4) 分布式工作。
二.简单示例
1.简单的helloword存储过程,可以直接在客户端直接进行调用
打印Hello World
/*
调用存储过程：
1. exec sayHelloWorld();
2. begin
sayHelloWorld();
sayHelloWorld();
end;
/
*/
create or replace procedure sayHelloWorld
as
--说明部分
begin
dbms_output.put_line('Hello World');
end;
/2.查询某个员工的信息
--in 输入参数
--out 输出参数
create or replace procedure queryempinfo(eno in number,
pename out varchar2,
psal out number,
pjob out varchar2)
as
begin
select ename,sal,empjob into pename,psal,pjob from emp where empno=eno;
end;
/3.复杂的存储过程
-- ----------------------------
-- procedure for addonprice_query
-- ----------------------------
-- Create procedure
create or replace procedure queryAddOnPrice(out_ow_price out number, voy in varchar2, airportlines in varchar2, transfer in varchar2,
leavePortTravelStartDate in varchar2, leavePortTravelEndDate in varchar2, cab in varchar2, fltNum_addOn_In in varchar2, fltNum_addOn_Out in varchar2 )
as
POW_PRICE INTERNATIONAL_ADDON_XXX.OW_PRICE%type;
begin
SELECT n.OW_PRICE into POW_PRICE from(
-- 此处对查询出来的结果集进行分组,排序 partition 是分组
select t.*,row_number() over(partition by INTERNATIONAL_LIMITED_FLIGHTS ,INLAND_LIMITED_FLIGHTS,
LEAVEPORT_TRAVEL_START_DATE, LEAVEPORT_TRAVEL_END_DATE,PUTPORT_TRAVEL_END_DATE,PUTPORT_TRAVEL_START_DATE order by UPDATE_TIME DESC,OW_PRICE asc) row_number from (
SELECT
OW_PRICE,
PUTPORT_TRAVEL_START_DATE,
PUTPORT_TRAVEL_END_DATE,
LEAVEPORT_TRAVEL_START_DATE,
LEAVEPORT_TRAVEL_END_DATE,
INTERNATIONAL_LIMITED_FLIGHTS,
INLAND_LIMITED_FLIGHTS,
UPDATE_TIME
FROM
INTERNATIONAL_ADDON_PRICE addonprice
WHERE
1 = 1
AND ADDON_AIRLINE_ID IN (
SELECT
VOYAGEID
FROM
INTERNATIONAL_ADDON_XXX
WHERE
voyage = voy
)
AND AIRLINES LIKE '%'||airportlines||'%'
AND TRANSFERS LIKE '%'||transfer||'%'
AND STATUS = 1
AND CABIN = cab
AND ((LEAVEPORT_TRAVEL_START_DATE <= leavePortTravelStartDate AND LEAVEPORT_TRAVEL_END_DATE >= leavePortTravelStartDate) OR (LEAVEPORT_TRAVEL_START_DATE is null and LEAVEPORT_TRAVEL_END_DATE is null ))
-- AND LEAVEPORT_TRAVEL_END_DATE >= leavePortTravelStartDate
AND ((PUTPORT_TRAVEL_END_DATE >= leavePortTravelEndDate AND PUTPORT_TRAVEL_START_DATE <= leavePortTravelEndDate) OR (PUTPORT_TRAVEL_END_DATE is null and PUTPORT_TRAVEL_START_DATE is null))
-- AND PUTPORT_TRAVEL_START_DATE <= leavePortTravelEndDate
AND leavePortTravelStartDate >= TRAVEL_START_DATE
AND leavePortTravelEndDate <= TRAVEL_END_DATE
AND (INLAND_LIMITED_FLIGHTS LIKE '%'||fltNum_addOn_In||'%' or INLAND_LIMITED_FLIGHTS is null)
AND (INTERNATIONAL_LIMITED_FLIGHTS LIKE '%'||fltNum_addOn_Out||'%' or INTERNATIONAL_LIMITED_FLIGHTS is null)
-- AND ( INLAND_LIMITED_FLIGHTS is not null or INTERNATIONAL_LIMITED_FLIGHTS is not null)
GROUP BY
OW_PRICE,
PUTPORT_TRAVEL_START_DATE,
PUTPORT_TRAVEL_END_DATE,
LEAVEPORT_TRAVEL_START_DATE,
LEAVEPORT_TRAVEL_END_DATE,
INTERNATIONAL_LIMITED_FLIGHTS,
INLAND_LIMITED_FLIGHTS,
UPDATE_TIME
ORDER BY
UPDATE_TIME DESC,
INTERNATIONAL_LIMITED_FLIGHTS nulls last,
INLAND_LIMITED_FLIGHTS nulls last,
OW_PRICE asc,
LEAVEPORT_TRAVEL_START_DATE nulls last,
LEAVEPORT_TRAVEL_END_DATE nulls last,
PUTPORT_TRAVEL_START_DATE nulls last,
PUTPORT_TRAVEL_END_DATE nulls last
) t
)
n where ROWNUM = 1;
out_ow_price := POW_PRICE;
EXCEPTION
WHEN NO_DATA_FOUND THEN
out_ow_price := 0;
dbms_output.put_line('没有XXXX的数据');
end;4.java代码调用存储过程
Session openSession = this.getHibernateTemplate().getSessionFactory().openSession();
Connection conn = null;
CallableStatement call = null;
Double addonPrice = 0d;
//String sql = "{?=call queryAddOnPrice(?,?,?,?,?,?,?,?)}";
String hql = "{call queryAddOnPrice(?,?,?,?,?,?,?,?,?)}";
try {
conn = openSession.connection();
call = conn.prepareCall(hql);
// out 参数 声明
call.registerOutParameter(1, OracleTypes.NUMBER);
call.setString(2, voyage); // in 参数 赋值
call.setString(3, airportlines);
call.setString(4, transfers);
call.setString(5, leavePortTravelStartDate);
call.setString(6, leavePortTravelEndDate);
call.setString(7, cabin);
call.setString(8, fltNum_addOn_In);
call.setString(9, fltNum_addOn_Out);
call.execute(); // 执行
addonPrice = call.getDouble(1); // 取出结果
log.info("通过存储过程 国内ADDON价格费用为:" + addonPrice );
} catch (Exception e) {
log.error("通过存储过程 国内ADDON价格费用出错!");
e.printStackTrace();
}finally{
WebUtil.release(call, conn, openSession);
}