Oracle存储过程相信大家都比较了解，下面就为您介绍Oracle存储过程使用动态SQL的方法，希望对您能够有所帮助。
CREATE OR REPLACE PROCEDURE P_STAT_SCORE01
(
PARA_EXAMGUID VARCHAR2, -- 考试ID A9093AE714AC47758A367B8813B99D1D,3216885E3B3148E3904908BD30BF9413,F8254D3E50F64819A996D1E369BBF053
CUR OUT SYS_REFCURSOR
) /****************************************************************************
名称：P_STAT_SCORE02
功能描述：根据考试ID,取出班级,考试科目信息 修订记录：
版本号 编辑时间 编辑人 修改描述
1.0.0 2016-4-7 CHEQNP 1.创建此存储过程,修改动态SQL语句，主要包括变量的使用和WHERE语句的书写 注释 入参出参描述：
PARA_EXAMGUID 考试ID
CUR 输出游标 *****************************************************************************/ AS
-- 定义变量
VAR_SQL CLOB; -- 拼接SQL
VAR_TEACHER_SQL CLOB; -- 科任老师
VAR_COURSENAME VARCHAR(200); -- 科目名称 BEGIN VAR_SQL := 'SELECT
(CASE WHEN CLASSROOM_NAME IS NULL THEN ''合计'' ELSE MIN(CLASSROOM_NAME) END) AS 班级 '; -- 取应考人数,实考人数
VAR_SQL := VAR_SQL || ' ,NVL2(CLASSROOM_NAME,
(SELECT COUNT(1) FROM TPRG_STUDENT a
LEFT JOIN TPRG_CLASSROOM b
ON a.CLASSROOM_ID = b.CLASSROOM_ID
WHERE b.CLASSROOM_NAME = T.CLASSROOM_NAME ),
(SELECT COUNT(1) FROM TPRG_STUDENT
WHERE CLASSROOM_ID
IN (SELECT CLASSROOM_ID
FROM V_FULL_SCORE
WHERE EXAMGUID = '''||PARA_EXAMGUID||'''
GROUP BY CLASSROOM_ID))) 应考人数
,COUNT(DISTINCT STUDID) AS 实考人数 '; -- 定义游标myCusor
-- 根据考试ID查询考试科目,并按照COURSEID生成科目顺序
DECLARE CURSOR myCusor IS SELECT COURSENAME FROM V_FULL_SCORE WHERE EXAMGUID = ''||PARA_EXAMGUID||''
GROUP BY COURSEID,COURSENAME
ORDER BY COURSEID ASC;
-- 开始使用游标取数据
BEGIN
OPEN myCusor;
LOOP
FETCH myCusor INTO VAR_COURSENAME;
-- 游标取不到数据则退出
EXIT WHEN myCusor%NOTFOUND; -- 动态拼接各科目SQL语句
VAR_SQL := VAR_SQL || ' , ROUND(SUM(CASE COURSENAME WHEN '''||VAR_COURSENAME||''' THEN SCORE_SUM ELSE 0 END) / SUM(CASE COURSENAME WHEN '''||VAR_COURSENAME||''' THEN 1 ELSE NULL END),2) '||VAR_COURSENAME||'平均分
, MAX(CASE COURSENAME WHEN '''||VAR_COURSENAME||''' THEN SCORE_SUM ELSE 0 END) '||VAR_COURSENAME||'最高分
, SUM(CASE WHEN COURSENAME = '''||VAR_COURSENAME||''' AND SCORE_SUM >= FULLSCORE_SUM * 0.6 THEN 1 ELSE 0 END) '||VAR_COURSENAME||'_及格人数
, ROUND(SUM(CASE WHEN COURSENAME = '''||VAR_COURSENAME||''' AND SCORE_SUM >= FULLSCORE_SUM * 0.6 THEN 1 ELSE 0 END) / SUM(CASE COURSENAME WHEN '''||VAR_COURSENAME||''' THEN 1 ELSE NULL END) * 100,2) '||VAR_COURSENAME||'_及格率
, SUM(CASE WHEN COURSENAME = '''||VAR_COURSENAME||''' AND SCORE_SUM >= FULLSCORE_SUM * 0.8 THEN 1 ELSE 0 END) '||VAR_COURSENAME||'_优分人数
, ROUND(SUM(CASE WHEN COURSENAME = '''||VAR_COURSENAME||''' AND SCORE_SUM >= FULLSCORE_SUM * 0.8 THEN 1 ELSE 0 END) / SUM(CASE COURSENAME WHEN '''||VAR_COURSENAME||''' THEN 1 ELSE NULL END) * 100,2) '||VAR_COURSENAME||'_优分率'; VAR_TEACHER_SQL := VAR_TEACHER_SQL || ' NULL AS ' || VAR_COURSENAME||'_科任老师 , '; END LOOP;
CLOSE myCusor;
END; -- 科任教师部分字符串去掉逗号
VAR_TEACHER_SQL := SUBSTR(TRIM(VAR_TEACHER_SQL),1,LENGTH(TRIM(VAR_TEACHER_SQL))-1); -- 拼接科任教师部分
VAR_SQL := VAR_SQL || ',' || VAR_TEACHER_SQL; -- 按照班级名称,科目名称,学生得到每个学生总分
-- 根据班级进行分组
VAR_SQL := VAR_SQL || ' FROM (
SELECT CLASSROOM_NAME
,COURSENAME
,STUDID
,STUD_NAME
,SUM(SCORE) AS SCORE_SUM
,SUM(FULLSCORE) AS FULLSCORE_SUM
FROM V_FULL_SCORE
WHERE EXAMGUID = '''||PARA_EXAMGUID||'''
GROUP BY
CLASSROOM_NAME
,COURSENAME
,STUDID
,STUD_NAME) T
GROUP BY ROLLUP(CLASSROOM_NAME)'; DBMS_OUTPUT.PUT_LINE(VAR_SQL); OPEN CUR FOR VAR_SQL; END ;