Oracle SQL 动态拼接Where后面的筛选条件

TBL_NAME COLM_NAME
OPER_CODE RULE_CMPAR_VALUE
AND_OR_OR

STORE_DISTRO RTE_ID
= 22410034
A

STORE_MASTER ZONE
= 贵州

需要拼接成：

 STORE_DISTRO.RTE_ID='22410034' and  STORE_MASTER.ZONE='贵州' 

1. 创建临时表存放查询后的数据，临时表可以根据实际查询结果创建（create table wmedi.wave_distro_filter... ..）

2. 创建自定义函数get_wave_query_param，用来拼接完整的Where条件

3. 定义sql字符，后面接上get_wave_query_param函数返回的筛选条件，通常情况下PL/SQL是不能直接运行的，需要用到execute immediate执行SQL，写入临时表，最后从临时表读取数据，（如果直接用execute immediate ‘select ... from ...’，很难返回出结果集，所以采用临时表存放数据）

declare strsql varchar2(3000);

strwhere varchar2(1000);

begin

execute immediate 'truncate table wmedi.wave_distro_filter';

strsql:='insert into wmedi.wave_distro_filter select store_distro.* ' ||

'from store_distro  '||

'inner join store_master on store_distro.store_nbr=store_master.store_nbr' ||

' where ' ;

select get_wave_query_param('201207110076') into strwhere from dual;

strsql:=strsql || strwhere;

execute immediate strsql;

end;

create or replace function get_wave_query_param (p_wave_nbr in carton_hdr.wave_nbr%type)

return varchar as

v_query_param varchar2(1000);

begin

select replace(text,';','') into v_query_param  from (

select row_number()over(partition by groupname order by groupname,lvl desc) rn,groupname,text from (

select t.groupname,level lvl,SYS_CONNECT_BY_PATH(t.strwhere,' ; ') text from (

select row_number()over(partition by rule_sel_dtl.rule_id order by rule_sel_dtl.sel_seq_nbr) id,'sqlwhere' groupname,tbl_name||'.'||colm_name||oper_code||''''||rule_cmpar_value||''' '||(case and_or_or when 'A' then 'and' when 'O' then 'or' else '' end) strWhere

  from rule_sel_dtl

where rule_id in (select rule_id

                     from wave_rule_parm

                    where wave_parm_id in

                          (select wave_parm_id

                             from wave_parm

                            where wave_nbr = p_wave_nbr)

                      and rule_prty = 1)

) t connect by t.groupname=prior t.groupname and id-1=prior id

) t

) t where t.rn=1;

return v_query_param;

exception

  when others then

    return null;

end;