Oracle开发常用函数与存储过程

1.输出用"、"符合分隔多个作者列表

Fuc_Get_AuthorName
create or replace function Fuc_Get_AuthorName(RecID_In in varchar2, AdmID_In in varchar2) return varchar2 is
Result varchar2(8000);
names varchar2(4000);

Cursor Cur_Get_AuthorNameS Is
      SELECT PEOPLENAME From TB_NEWS_CONTRI_AUTHOR Where REC_ID=RecID_In;

Cursor Cur_Get_AuthorName Is
      SELECT PEOPLENAME From TB_NEWS_CONTRI_AUTHOR Where REC_ID=RecID_In And UNITID=AdmID_In;
begin

If RecID_In Is NULL Then
    Return '';
End If;

If AdmID_In Is NULL Then
    open Cur_Get_AuthorNameS;
    fetch Cur_Get_AuthorNameS into names;
    while Cur_Get_AuthorNameS%FOUND
    loop
        Result:=Result || names || '、';
        fetch Cur_Get_AuthorNameS into names;
    end loop;
    close Cur_Get_AuthorNameS;
ELSE
    open Cur_Get_AuthorName;
    fetch Cur_Get_AuthorName into names;
    while Cur_Get_AuthorName%FOUND
    loop
        Result:=Result || names || '、';
        fetch Cur_Get_AuthorName into names;
    end loop;
    close Cur_Get_AuthorName;
End If;


if(Result is null) Then
    Return '';
End If;

if length(Result)>0 then
     Result:=substr(Result,1,length(Result)-1);
end if;
return(Result);

Exception
    When OTHERS Then
      Return '';
end Fuc_Get_AuthorName;

2.获取数据库表的主键最大值

Fuc_Get_MaxId
CREATE OR REPLACE FUNCTION Fuc_Get_MaxId( TableName_In IN Varchar2,FieldName_In IN Varchar2,CallMode_In IN Varchar2 ) Return Varchar2 IS
/*---------------------------------------------------------------------------*/
功能:
     获取数据库表的主键最大值。
    输入参数:
     TableName_In --输入需要查询数据库表名称
     FieldName_In --输入数据库表对应主键的字段名
     CallMode_In   --输入调用方式,缺省为'0'
输出参数:
     新的12位主键值
/*---------------------------------------------------------------------------*/
   
SqlStrTmp Varchar2(500);
MaxFieldTmp Varchar2(12);
MaxFieldVar Varchar2(12);
TableNameTmp Varchar2(50);

FieldNameTmp Varchar2(50);

SysFieldTmp Varchar2(4);

Cursor Cur_Sys_Var Is
         Select SubStrb(VarValue,1,4) VarValue From Tb_Sys_Var Where VarName='CurrCode';

BEGIN



If TableName_In Is NULL Or FieldName_In Is NULL Then
    Return '000000000000';
End If;

TableNameTmp := Upper( TableName_In );
FieldNameTmp := Upper( FieldName_In );

Open Cur_Sys_Var;
Fetch Cur_Sys_Var Into SysFieldTmp;
If Cur_Sys_Var%NOTFOUND Then
    Close Cur_Sys_Var;
    Return '000000000000';
End if;
Close Cur_Sys_Var;

SqlStrTmp := 'SELECT MAX(To_Number('||FieldNameTmp||')) FROM '||TableNameTmp
            ||' WHERE '||FieldNameTmp||' LIKE '''||SysFieldTmp||'%''';

Execute Immediate SqlStrTmp INTO MaxFieldTmp;

MaxFieldVar := SysFieldTmp||Lpad( To_Char(To_Number(Substrb(Nvl(MaxFieldTmp,SysFieldTmp||'00000000'),5))+1),8,'0');

Return MaxFieldVar;

Exception
    When OTHERS Then
      Return SysFieldTmp||'00000001';
  
END;

3.根据分割类来分割字符串

sf_split_string
CREATE OR REPLACE FUNCTION sf_split_string (strings VARCHAR2, substring VARCHAR2) RETURN Varchar2Varray IS
/*---------------------------------------------------------------------------*/
功能:
     根据分割类来分割字符串
    输入参数:
     strings --输入字符串(如:aaaa|bbbb|cccc)
     substring --用于分割的标志(如:' | ' )
输出参数:
     数组
/*---------------------------------------------------------------------------*/

len integer := LENGTH(substring);
lastpos integer := 1 - len;
pos integer;
num integer;
i integer := 1;
ret Varchar2Varray := Varchar2Varray(NULL);
BEGIN
LOOP
pos := instr(strings, substring, lastpos + len);
IF pos > 0 THEN --found
num := pos - (lastpos + len);
ELSE --not found
num := LENGTH(strings) + 1 - (lastpos + len);
END IF;

IF i > ret.LAST THEN
ret.EXTEND;
END IF;

ret(i) := SUBSTR(strings, lastpos + len, num);

EXIT WHEN pos = 0;
lastpos := pos;
i := i + 1;
END LOOP;

RETURN ret;
END;

4.计算周岁的函数

Fuc_Get_FullAge
CREATE OR REPLACE FUNCTION Fuc_Get_FullAge(BirthDay_In in date, CallDay_In in date) RETURN integer IS
age integer;

BEGIN

/*
**给出出生日期,计算日期,返回周岁
**1、如果计算日期和出生日期的月份相同,就要判断计算日期是否过了出生日期
**2、如果是2月29日出生的,那如果是闰年,就是3月1号算增加1岁,如果不是闰年,3月2日增加1岁
**
*/
if BirthDay_In is null or CallDay_In is null then
      return null;
end if;
  
--计算日期比出生日期小,返回NULL
if (CallDay_In - BirthDay_In)<0 then
     return null;
end if;

--计算日期   =   出生日期,返回0
if (BirthDay_In - CallDay_In)=0 then
     return 0;
end if;

age := extract(year from CallDay_In)-extract(year from BirthDay_In)-1;

----如果月份相同,计算日期>出生日期,加1
if   (extract(month from BirthDay_In) = extract(month from CallDay_In)) and (extract(day from BirthDay_In) < extract(day from CallDay_In)) then
      age := age + 1;
end if;

----如果计算月份比出生月份大,加1
if   (extract(month from BirthDay_In) < extract(month from CallDay_In)) then
   age := age + 1;
end if;

----如果出生日期是2月29日,而计算日期是3月1日,那么计算日期是闰年,要减1
if   (extract(month from BirthDay_In) = 2 and extract(day from BirthDay_In) = 29 and extract(month from CallDay_In) = 3 and extract(day from CallDay_In) = 1 and ((extract(year from CallDay_In) mod 4=0 and extract(year from CallDay_In) mod 100!=0 ) or extract(year from CallDay_In) mod 400=0)) then
   age := age - 1;
end if;

return age;

Exception
    When OTHERS Then
      Return 0;

end;

5.获取数据表架构信息

SQL
--请问如何用SQL语句获取指定表的表结构
--该表应包含以下字段:字段名、字段类型、字段大小、是否为空

SELECT   column_name   AS   FIELDNAME,data_type   AS   TYPE,data_length   ASSIZE,
nullable   AS   ISNULL   FROM   ALL_tab_columns
where table_name = 'TB_SYS_ORG_MEMBER'   

SELECT * FROM ALL_TAB_COLUMNS
where owner='ZSZGW' and table_name='TB_SYS_ORG_MEMBER';  

--根据字段注释查询字段

SELECT A.TABLE_NAME,A.COMMENTS,B.COLUMN_NAME,B.COMMENTS
FROM USER_TAB_COMMENTS A,USER_COL_COMMENTS B
WHERE A.TABLE_NAME=B.TABLE_NAME and b.COMMENTS like '%发放%' --介绍
and a.table_name='TB_SYS_ORG_MEMBER';

--1、SELECT * FROM ALL_TAB_COLUMNS where owner='USE1' and table_name ='B';
--2、desc 表名
--3、
SELECT column_name AS FIELDNAME,data_type,data_length,
nullable AS ISNULL FROM user_tab_columns where table_name = 'TB_SYS_ORG_MEMBER'


SELECT * FROM user_tab_columns where table_name = 'TB_SYS_ORG_MEMBER'

select userenv ('terminal') from dual

select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual;--mi是分钟

select user from dual

SELECT S.SID SESSION_ID, S.USERNAME, DECODE(LMODE, 0, 'None', 1, 'Null', 2, 'Row-S (SS)', 3, 'Row-X (SX)', 4, 'Share', 5, 'S/Row-X (SSX)', 6, 'Exclusive',
TO_CHAR(LMODE)) MODE_HELD, DECODE(REQUEST, 0, 'None', 1, 'Null', 2, 'Row-S (SS)', 3, 'Row-X (SX)', 4, 'Share', 5, 'S/Row-X (SSX)', 6, 'Exclusive',
TO_CHAR(REQUEST)) MODE_REQUESTED, O.OWNER||'.'||O.OBJECT_NAME||' ('||O.OBJECT_TYPE||')',
S.TYPE LOCK_TYPE, L.ID1 LOCK_ID1, L.ID2 LOCK_ID2 FROM V$LOCK L, SYS.DBA_OBJECTS O,
V$SESSION S WHERE L.SID = S.SID AND L.ID1 = O.OBJECT_ID ;

6.带排序的oracle分页存储过程(来自网络)

Code
--输入order by 的sqeuence是,应该为“ desc”或者“ asc”
--若输入两个order by则,v_order_field=" a[sequence] ,order by b "

CREATE OR REPLACE PROCEDURE TABLEPAGE_SELECT(v_page_size  int, --the size of a page of list
                       v_current_page int, --the current page of list
                       v_table_name varchar2, --the talbe name
                       v_order_field varchar2,--the order field
                       v_order_sequence varchar2,--the order sequence should by "_desc"or "_asc",_is blank.
                       --v_sql_select  varchar2, --the select sql for procedure
                       --v_sql_count  varchar2, --the count sql for procedure
                       --v_out_recordcount OUT int, --the num of return rows
                       p_cursor OUT refcursor_pkg.return_cursor) as
 v_sql     varchar2(3000); --the sql for select all rows of list
 v_sql_count  varchar2(3000); --the count sql for procedure
 v_sql_order  varchar2(2000); --the order of list
 v_count    int; -- the amount rows fo original list
 v_endrownum  int; --the end row num of the current page
 v_startrownum int; --the start row num of the current page
BEGIN
 ----set the order of list
 if v_order_field!='NO' then
  v_sql_order :=' ORDER BY '|| v_order_field ||' '||v_order_sequence;
 else
   v_sql_order :='';
 end if;
 ----catch the amount rows of list
 v_sql_count:='SELECT COUNT(ROWNUM) FROM '||v_table_name;
 execute immediate v_sql_count into v_count;
 -- v_out_recordcount := v_count;
 ----set the value of start and end row
 if v_order_sequence='desc' then
  v_endrownum:=v_count-(v_current_page-1)*v_page_size;
  v_startrownum:=v_endrownum - v_page_size + 1;
 else
  v_endrownum:= v_current_page * v_page_size;
  v_startrownum := v_endrownum - v_page_size + 1;
 end if;
 ----the sql for page slide
 v_sql := 'SELECT * FROM (SELECT '||v_table_name||'.*, rownum rn FROM '||v_table_name||' WHERE rownum <= ' ||
      to_char(v_endrownum) ||' '|| v_sql_order||') WHERE rn >= ' ||
      to_char(v_startrownum)||' '||v_sql_order;
 open p_cursor for v_sql;
END TABLEPAGE_SELECT;

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