Sqlserver2005迁移至Oracle系列之三：在Oracle中创建sql中的常见函数
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prompt
prompt Creating function CHARINDEX
prompt ===========================
prompt
CREATE OR REPLACE FUNCTION charindex
(
search VARCHAR2,
src VARCHAR2,
pos INT := 0
) RETURN INT AS
tp_pos INT;
tp_src VARCHAR2(2000);
v_pos INT;
BEGIN
v_pos := 0;
tp_pos := pos;
tp_src := src;
IF pos <= 0 THEN
RETURN(instr(src, search, 1, 1));
ELSE
tp_src := substr(src, pos);
v_pos := nvl(instr(tp_src, search, 1, 1), 0);
IF v_pos = 0 THEN
RETURN(0);
ELSE
RETURN(v_pos + tp_pos - 1);
END IF;
END IF;
END charindex;
/
prompt
prompt Creating function DATEADD
prompt =========================
prompt
CREATE OR REPLACE FUNCTION dateadd
(
format VARCHAR2 := 'd',
n INT := 0,
dateval DATE := SYSDATE
) RETURN DATE AS
fmt VARCHAR2(10);
BEGIN
fmt := upper(format);
IF fmt IN ('D', 'DD', 'DAY') THEN
RETURN(dateval + n);
ELSIF fmt IN ('M', 'MM', 'MONTH') THEN
RETURN(add_months(dateval, n));
ELSIF fmt IN ('Y', 'YY', 'YYY', 'YYYY', 'YEAR') THEN
RETURN(add_months(dateval, n * 12.0));
ELSIF fmt IN ('H', 'HH', 'HOUR') THEN
RETURN(dateval + n / 24.0);
ELSIF fmt IN ('N', 'MI', 'MINUTE') THEN
RETURN(dateval + n / 24.0 / 60.0);
ELSIF fmt IN ('S', 'SS', 'SECOND') THEN
RETURN(dateval + n / 24.0 / 60.0 / 60.0);
ELSE
RETURN(NULL);
END IF;
END;
/
prompt
prompt Creating function DATEDIFF
prompt ==========================
prompt
CREATE OR REPLACE FUNCTION datediff
(
format VARCHAR2 := 'd',
datebegin DATE := SYSDATE,
dateend DATE := SYSDATE
) RETURN INT AS
fmt VARCHAR2(10);
BEGIN
fmt := upper(format);
IF fmt IN ('D', 'DD', 'DAY')
THEN
RETURN(datebegin - dateend);
ELSIF fmt IN ('M', 'MM', 'MONTH')
THEN
RETURN((datebegin - dateend) / 30);
ELSIF fmt IN ('Y', 'YY', 'YYY', 'YYYY', 'YEAR')
THEN
RETURN((datebegin - dateend) / 365);
ELSIF fmt IN ('H', 'HH', 'HOUR')
THEN
RETURN((datebegin - dateend) * 24);
ELSIF fmt IN ('N', 'MI', 'MINUTE')
THEN
RETURN((datebegin - dateend) * 24.0 * 60.0);
ELSIF fmt IN ('S', 'SS', 'SECOND')
THEN
RETURN((datebegin - dateend) * 24.0 * 60.0 * 60.0);
ELSE
RETURN(NULL);
END IF;
END;
/
prompt
prompt Creating function DATEPART
prompt ==========================
prompt
CREATE OR REPLACE FUNCTION datepart
(
format VARCHAR2 := 'd',
dateval DATE := SYSDATE
) RETURN VARCHAR2 AS
fmt VARCHAR2(10);
BEGIN
fmt := upper(format);
IF fmt IN ('D', 'DD', 'DAY')
THEN
RETURN(to_char(dateval, 'DD'));
ELSIF fmt IN ('M', 'MM', 'MONTH')
THEN
RETURN(to_char(dateval, 'MM'));
ELSIF fmt IN ('Y', 'YY', 'YYY', 'YYYY', 'YEAR')
THEN
RETURN(to_char(dateval, 'YYYY'));
ELSIF fmt IN ('H', 'HH', 'HOUR')
THEN
RETURN(to_char(dateval, 'HH'));
ELSIF fmt IN ('N', 'MI', 'MINUTE')
THEN
RETURN(to_char(dateval, 'MI'));
ELSIF fmt IN ('S', 'SS', 'SECOND')
THEN
RETURN(to_char(dateval, 'SS'));
ELSE
RETURN(NULL);
END IF;
END;
/
prompt
prompt Creating function DAY
prompt =====================
prompt
create or replace function day(v_date date := sysdate) return int as
begin
return(
to_number(TO_CHAR(v_date, 'dd'))
);
end;
/
prompt
prompt Creating function LEFT
prompt ======================
prompt
CREATE OR REPLACE FUNCTION left(src VARCHAR2,n INT) RETURN VARCHAR2 AS
BEGIN
RETURN(SUBSTR(src, 0, n));
END left;
/
prompt
prompt Creating function MONTH
prompt =======================
prompt
create or replace function month(v_date date := sysdate) return int as
begin
return(
to_number(TO_CHAR(v_date, 'mm'))
);
end;
/
prompt
prompt Creating function REPLICATE
prompt ===========================
prompt
CREATE OR REPLACE FUNCTION replicate
(
v_str VARCHAR2,
n INT
)
RETURN VARCHAR2 AS
v_dest VARCHAR(2000);
BEGIN
IF n <= 0 THEN
RETURN('');
ELSE
FOR i IN 1 .. n LOOP
v_dest := v_dest || v_str;
END LOOP;
END IF;
RETURN(v_dest);
END;
/
prompt
prompt Creating function RIGHT
prompt =======================
prompt
CREATE OR REPLACE FUNCTION right(src VARCHAR2,n INT) RETURN VARCHAR2 AS
BEGIN
RETURN(SUBSTR(src, -n));
END right;
/
prompt
prompt Creating function STR
prompt =====================
prompt
CREATE OR REPLACE FUNCTION str
(
numberval NUMBER,
len INT := 10,
decima INT := 0
) RETURN VARCHAR2 AS
v_decima INT;
v_numberval VARCHAR(300);
v_pos INT;
BEGIN
v_decima := abs(decima);
v_numberval := to_char(numberval);
v_pos := instr(v_numberval, '.');
IF v_decima > 16
THEN
v_decima := 16;
END IF;
IF v_pos = 0
THEN
v_pos := length(v_numberval);
IF abs(len) < v_pos
THEN
RETURN(lpad('*', len, '*'));
ELSE
RETURN(substr(v_numberval, 0, v_pos));
END IF;
ELSE
IF abs(len) < v_pos - 1
THEN
RETURN(lpad('*', len, '*'));
ELSE
IF least(v_decima, abs(len) - v_pos) > 0
THEN
v_numberval := to_char(round(numberval, least(v_decima, abs(len) - v_pos)));
RETURN(v_numberval);
ELSE
RETURN(rtrim(substr(v_numberval, 0, least((v_pos + v_decima), abs(len))), '.'));
END IF;
END IF;
END IF;
END str;
/
prompt
prompt Creating function STUFF
prompt =======================
prompt
CREATE OR REPLACE FUNCTION stuff
(
v_str VARCHAR2,
v_start INT,
v_len INT,
v_repacestr VARCHAR2
) RETURN VARCHAR2 AS
tp_str VARCHAR2(4000);
BEGIN
tp_str := v_str;
IF v_start <= 0
OR v_len < 0 THEN
RETURN('');
ELSIF v_start > length(v_str) THEN
RETURN('');
ELSE
tp_str := substr(v_str, 0, greatest(1, v_start) - 1) || v_repacestr || substr(v_str, greatest(1, v_start) + v_len);
RETURN(tp_str);
END IF;
END;
/
prompt
prompt Creating function SUBSTRING
prompt ===========================
prompt
CREATE OR REPLACE FUNCTION substring
(
str VARCHAR2,
pos INT := 0,
len INT := 0
) RETURN VARCHAR2 AS
BEGIN
IF len <= 0 THEN
RETURN('');
ELSIF (pos + len) <= 0 THEN
RETURN('');
ELSE
RETURN(substr(str, greatest(pos, 0), least(len, len + pos)));
END IF;
END substring;
/
prompt
prompt Creating function YEAR
prompt ======================
prompt
create or replace function year(v_date date := sysdate) return int as
begin
return(
to_number(TO_CHAR(v_date, 'yyyy'))
);
end;
/
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