Oracle中的Split函数
首先需要定义 2 个类型
1. Row 类型
CREATE OR REPLACE TYPE ty_row_str_split as object (strValue VARCHAR2 (4000))
2. Table 类型
CREATE OR REPLACE TYPE ty_tbl_str_split IS TABLE OF ty_row_str_split
创建函数:
CREATE OR REPLACE FUNCTION fn_split(p_str IN VARCHAR2,
p_delimiter IN VARCHAR2)
RETURN ty_tbl_str_split IS
j INT := 0;
i INT := 1;
len INT := 0;
len1 INT := 0;
str VARCHAR2(4000);
str_split ty_tbl_str_split := ty_tbl_str_split();
BEGIN
len := LENGTH(p_str);
len1 := LENGTH(p_delimiter);
WHILE j < len LOOP
j := INSTR(p_str, p_delimiter, i);
IF j = 0 THEN
j := len;
str := SUBSTR(p_str, i);
str_split.EXTEND;
str_split(str_split.COUNT) := ty_row_str_split(strValue => str);
IF i >= len THEN
EXIT;
END IF;
ELSE
str := SUBSTR(p_str, i, j - i);
i := j + len1;
str_split.EXTEND;
str_split(str_split.COUNT) := ty_row_str_split(strValue => str);
END IF;
END LOOP;
RETURN str_split;
END fn_split;
p_delimiter IN VARCHAR2)
RETURN ty_tbl_str_split IS
j INT := 0;
i INT := 1;
len INT := 0;
len1 INT := 0;
str VARCHAR2(4000);
str_split ty_tbl_str_split := ty_tbl_str_split();
BEGIN
len := LENGTH(p_str);
len1 := LENGTH(p_delimiter);
WHILE j < len LOOP
j := INSTR(p_str, p_delimiter, i);
IF j = 0 THEN
j := len;
str := SUBSTR(p_str, i);
str_split.EXTEND;
str_split(str_split.COUNT) := ty_row_str_split(strValue => str);
IF i >= len THEN
EXIT;
END IF;
ELSE
str := SUBSTR(p_str, i, j - i);
i := j + len1;
str_split.EXTEND;
str_split(str_split.COUNT) := ty_row_str_split(strValue => str);
END IF;
END LOOP;
RETURN str_split;
END fn_split;
使用样例:
select to_number(strvalue) as Value from table(fn_split('1,2,3',','))
select to_char(strvalue) as Value from table(fn_split('aa,bb,cc',','))
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方法2:
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CREATE OR REPLACE TYPE type_split IS TABLE OF VARCHAR2 (4000)
代码
create or replace function split(p_list varchar2,p_sep varchar2 := ',') return type_split pipelined
IS
l_idx pls_integer;
v_list varchar2(4000) := p_list;
begin
loop
l_idx := instr(v_list,p_sep);
if l_idx > 0 then
pipe row(substr(v_list,1,l_idx-1));
v_list := substr(v_list,l_idx+length(p_sep));
else
pipe row(v_list);
exit;
end if;
end loop;
return;
end split;
IS
l_idx pls_integer;
v_list varchar2(4000) := p_list;
begin
loop
l_idx := instr(v_list,p_sep);
if l_idx > 0 then
pipe row(substr(v_list,1,l_idx-1));
v_list := substr(v_list,l_idx+length(p_sep));
else
pipe row(v_list);
exit;
end if;
end loop;
return;
end split;