Oracle dbms_lob.append函数中有bug还是我做错了
我创建了以下函数Oracle dbms_lob.append函数中有bug还是我做错了,oracle,plsql,lob,Oracle,Plsql,Lob,我创建了以下函数 function lob_replace( p_lob in out clob,p_what in varchar2,p_with in clob ) return clob as l_temp_number number; l_temp_number_1 number; l_temp_clob clob; l_return_clob clob; l_temp1_clob clob; l_temp2
function lob_replace( p_lob in out clob,p_what in varchar2,p_with in clob ) return clob
as
l_temp_number number;
l_temp_number_1 number;
l_temp_clob clob;
l_return_clob clob;
l_temp1_clob clob;
l_temp2_clob clob;
begin
l_temp_number:=dbms_lob.instr(p_lob, p_what);
--Create a lob locator
DBMS_LOB.createtemporary(l_temp_clob,true);
DBMS_LOB.createtemporary(l_temp1_clob,true);
DBMS_LOB.createtemporary(l_temp2_clob,true);
---substract and build the LOBs
l_temp_number_1:=length(p_lob);
l_temp_clob:=dbms_lob.substr(p_lob,l_temp_number-1,1);
l_temp1_clob:=dbms_lob.substr(p_lob,l_temp_number_1-l_temp_number+1 ,l_temp_number +length(p_what) );
--append three diff lob to one
dbms_lob.append(l_temp2_clob,l_temp_clob);
dbms_lob.append(l_temp2_clob,p_with);
dbms_lob.append(l_temp2_clob,l_temp1_clob);
l_return_clob :=l_temp2_clob;
--remove the tmp lob
DBMS_LOB.freetemporary(l_temp_clob);
DBMS_LOB.freetemporary(l_temp1_clob);
DBMS_LOB.freetemporary(l_temp2_clob);
return l_return_clob;
end;
如果我按如下方式调用此函数,此将抛出错误
declare
temp clob;
begin
temp:='replace this #a#';
temp:=lob_replace(temp,'#a#','with this');
end;
它将抛出下面的错误
ORA-06502: PL/SQL: numeric or value error: invalid LOB locator specified: ORA-22275
ORA-06512: at "SYS.DBMS_LOB", line 639
ORA-06512: at "LOB_REPLACE", line 24
ORA-06512: at line 5
但是这个不会抛出错误
declare
temp clob;
begin
temp:='replace this #a# ';
temp:=lob_replace(temp,'#a#','with this');
end;
请注意temp:='replace this#a#'末尾的额外空格代码>
有人知道这样做的原因吗?当您构建l_temp1\u clob
时,如果需要添加任何内容,您只能添加lob的其余部分。更改您的代码:
l_temp1_clob:=dbms_lob.substr(p_lob,l_temp_number_1-l_temp_number+1 ,l_temp_number +length(p_what) );
为此:
if l_temp_number +length(p_what) < l_temp_number_1
then
l_temp1_clob := dbms_lob.substr(p_lob, l_temp_number_1 - l_temp_number - 1 , l_temp_number +length(p_what) );
end if;
declare
temp clob;
begin
temp:='replace this #a#';
temp:=lob_replace(dd,'#a#','with this');
end;