以下的文章主要是对Oracle合并函数的两种类型的介绍,即,Oracle9i与Oracle10g相关实际应用代码的介绍,以及Oracle9i的具体使用方案的描述,下面就是文章的具体内容的介绍,望你会有所收获。
Oracle合并函数之9i下:
- create type strcat_type as object (
- cat_string varchar2(4000),
- static function ODCIAggregateInitialize(cs_ctx In Out strcat_type) return number,
- member function ODCIAggregateIterate(self In Out strcat_type,value in varchar2) return number,
- member function ODCIAggregateMerge(self In Out strcat_type,ctx2 In Out strcat_type) return number,
- member function ODCIAggregateTerminate(self In Out strcat_type,returnValue Out varchar2,flags in number) return number
- )
- /
- create type body strcat_type is
- static function ODCIAggregateInitialize(cs_ctx IN OUT strcat_type) return number
- is
- begin
- cs_ctx := strcat_type( null );
- return ODCIConst.Success;
- end;
- member function ODCIAggregateIterate(self IN OUT strcat_type,
- value IN varchar2 )
- return number
- is
- begin
- self.cat_string := self.cat_string || ','|| value;
- return ODCIConst.Success;
- end;
- member function ODCIAggregateTerminate(self IN Out strcat_type,
- returnValue OUT varchar2,
- flags IN number)
- return number
- is
- begin
- returnValue := ltrim(rtrim(self.cat_string,','),',');
- return ODCIConst.Success;
- end;
- member function ODCIAggregateMerge(self IN OUT strcat_type,
- ctx2 IN Out strcat_type)
- return number
- is
- begin
- self.cat_string := self.cat_string || ',' || ctx2.cat_string;
- return ODCIConst.Success;
- end;
- end;
- /
- CREATE or replace
- FUNCTION strcat(input varchar2 )
- RETURN varchar2
- PARALLEL_ENABLE AGGREGATE USING strcat_type;
- /
使用方法:
- select t2.kdm_mdid_pk,t2.kdm_title,
- strcat(t3.subject_mc_content) message
- from t_knodoc_rel_subjects t1,
- T_KNO_DOC_METADATA t2,
- T_SUBJECT_MULTILINGUAL_CONTENT t3
- where t1.krs_kdm_mdid_fk=t2.kdm_mdid_pk
- and t1.krs_subid_fk=t3.subject_mc_id_pk
- group by t2.kdm_mdid_pk,t2.kdm_title
Oracle合并函数之10g下:
- select t2.kdm_mdid_pk,t2.kdm_title,WMSYS.WM_CONCAT(t3.subject_mc_content) message
- from t_knodoc_rel_subjects t1,
- T_KNO_DOC_METADATA t2,
- T_SUBJECT_MULTILINGUAL_CONTENT t3
- where t1.krs_kdm_mdid_fk=t2.kdm_mdid_pk
- and t1.krs_subid_fk=t3.subject_mc_id_pk
- group by t2.kdm_mdid_pk,t2.kdm_title
以上的相关内容就是对Oracle合并函数的介绍,望你能有所收获。
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