1 新建数据库类型
create or replace type STR_SPLIT as table of varchar2(50)
2 创建function
CREATE OR REPLACE FUNCTION SPLITSTR(P_STRING IN VARCHAR2, P_DELIMITER IN VARCHAR2) RETURN STR_SPLIT PIPELINED IS V_LENGTH NUMBER := LENGTH(P_STRING); V_START NUMBER := 1; V_INDEX NUMBER; BEGIN WHILE (V_START <= V_LENGTH) LOOP V_INDEX := INSTR(P_STRING, P_DELIMITER, V_START); IF V_INDEX = 0 THEN PIPE ROW(SUBSTR(P_STRING, V_START)); V_START := V_LENGTH + 1; ELSE PIPE ROW(SUBSTR(P_STRING, V_START, V_INDEX - V_START)); V_START := V_INDEX + 1; END IF; END LOOP; RETURN; END SPLITSTR;
3 测试
select * from table(splitstr('Hello,Cnblogs!',','));
将行转为列显示:
select a.column_value v1,b.column_value v2 from (select * from (select rownum rn,t.* from table(splitstr('Hello,Cnblogs!',',')) t)) a, (select * from (select rownum rn,t.* from table(splitstr('Hello,Cnblogs!',',')) t)) b where a.rn=1 and b.rn=2