oracle過濾分割字串自定義函式

該函式實現過濾前後的指定的字串，諸如過濾分隔符等。可用於過濾字串中的逗號分割符。特別說明：substr()函式支援從字串倒數開始讀取,例如：

dbms_output.put_line( substr('hello world',-3,3)); 

執行結果：rld

--過濾字串前後的多疑字元，諸如過濾字串前後的多餘逗號

function  fn_dislodgesplitchar(
p_facultylist in varchar2 default '',
p_facultychar in varchar2 default '',
p_facultytype in varchar2 default ''
)   
return varchar2
as    
v_facultylist             varchar2(32767) default '';
v_facultychar             varchar2(8000)  default '';
v_facultytype             varchar2(20)    default '';
v_facultylistlength       pls_integer    default 0;
v_facultycharlength       pls_integer    default 0;
begin   
v_facultylist             := trim(p_facultylist);
v_facultychar             := trim(p_facultychar); 
v_facultytype             := trim(p_facultytype);
v_facultylistlength       := length(v_facultylist);
v_facultycharlength       := length(v_facultychar);
if v_facultytype = 'all' then  
v_facultytype := 'leftright';
end if;
if v_facultylistlength > 0 then 
if instr(v_facultytype,'left') > 0 and substr(v_facultylist,1,v_facultycharlength) = v_facultychar then 
v_facultylist := substr(v_facultylist, -1, v_facultylistlength - v_facultycharlength);
end if;
if instr(v_facultytype,'right') > 0 and substr(v_facultylist,-v_facultycharlength, v_facultycharlength) = v_facultychar then
v_facultylist := substr(v_facultylist,1,v_facultylistlength - v_facultycharlength);
end if;
end if;
return v_facultylist;       
end fn_dislodgesplitchar;

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