oracle中使用临时表GLOBAL TEMPORARY TABLE

需要在存储过程中返回一个临时结果集，这个结果集又是多个语句通过循环查询出来的，这时候就想到了将结果插入到临时表中，然后返回临时表的数据的思路，于是有了以下操作：

1.创建临时表

-- Create table
create global temporary table T_PROJECT_AMOUNT_TEMP
(project_id       VARCHAR2(1000),con_amount_tax_s NUMBER
)
on commit preserve rows;
-- Add comments to the table 
comment on table T_PROJECT_AMOUNT_TEMPis '临时表';
-- Add comments to the columns 
comment on column T_PROJECT_AMOUNT_TEMP.project_idis '项目ID';
comment on column T_PROJECT_AMOUNT_TEMP.con_amount_tax_sis '项目合同金额';

2.创建存储过程

CREATE OR REPLACE PROCEDURE PRC_XXXX(TODO_CUR OUT PKG_QUERY.CUR_QUERY
) ASBEGINdelete from T_PROJECT_AMOUNT_TEMP;--遍历数据for dataOjb in (select * from  xxx t where xxx) loop--往临时表插入记录insert into T_PROJECT_AMOUNT_TEMPselect xx,xx  from XXX;insert into T_PROJECT_AMOUNT_TEMPselect xx,xx  from XXX;END LOOP;--将临时表中的记录返回open TODO_CUR forselect * from T_PROJECT_AMOUNT_TEMP k;END PRC_XXXX;

在存储过程中先将临时表清空，然后再往临时表插入记录，不然数据会重复插入。