编码规则规范
/*
|| 在注释开始的首行只放斜线星号，标志注释开始，
|| 然后注释块的每一行以双垂直线开头，突出注释后面
|| 的内容是注释部分，最后，将星号斜线单置于一行
*/
DECLARE
v_ename VARCHAR2(20);
v_rate NUMBER(7,2);
c_rate_incr CONSTANT NUMBER(7,2):=1.10;
BEGIN
--方法一：通过SELECT INTO给变量赋值
SELECT ename, sal* c_rate_incr
INTO v_ename, v_rate
FROM employee
WHERE empno='7788';
--方法二：通过赋值操作符“:=”给变量赋值
v_ename:='SCOTT';
END;
标示符示例
/*
===========================================================
| 标示符示例
============================================================
*/
DECLARE
ename varchar2(20) :='FORD';
BEGIN
DELETE FROM employee WHERE ename=ename;
END;
SELECT * FROM employee;
ROLLBACK;
格式化单独语句
/*
|| 格式化单独的语句
*/
new_id := 15; calc_total (new_id); max_dollars := 105 * sales_adj;
--可改写为：
new_id := 15;
calc_total (new_id);
max_dollars := 105 * sales_adj;
/*
|| 格式化多行语句
*/
--第一条语句
IF total_sales < maximum_sales AND company_type = 'NEW' AND (override
= 'Y' OR total_company_revenue < planned_revenue (SYSDATE))
THEN
accept_order;
END IF;
--可改写为：
IF total_sales < maximum_sales
AND company_type = 'NEW'
AND (override= 'Y'
OR total_company_revenue < planned_revenue (SYSDATE))
THEN
accept_order;
END IF;
--第二条语句
generate_company_statistics (company_id, last_year_date
, rollup_type, total, average, variance, budgeted, next_year_plan);
--改写为第一种：
generate_company_statistics (company_id, last_year_date,
rollup_type, total, average, variance, budgeted, next_year_plan);
--改写为第二种：
generate_company_statistics
(company_id, last_year_date, rollup_type,
total, average, variance, budgeted, next_year_plan);
--第三条语句
total_sales := product_sales (company_id) + admin_cutbacks *
.5 - overhead - golden_parachutes;
--可改写为：
total_sales :=
product_sales(company_id)+
admin_cutbacks *0.5-
overhead-
golden_parachutes;
