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ORACLE应用经验(1)

正在看的ORACLE教程是:ORACLE应用经验(1)。 JAN-1(January) FEB-2(February) MAR-3(March)
APR-4(April) MAY-5(May) JUN-6(June)
JUL-7(July) AUG-8(August) SEP-9(September)
OCT-10(October) NOV-11(November) DEC-12(December)
********************************************************************
****************************常用设置********************************
---on-log 触发器编写示范
Declare
flag varchar2(80):=null;
cou number:=1;
n number;
Begin
Loop
logon(USERNAME,PASSWORD||@||CONNECT,PROPERTY_FALSE....);
flag:=Get_Application_Property(DATASOURCE);
Exit when cou>8 or flag=ORACLE;
cou:=cou+1;
End Loop;
If flagORACLE then
set_alert_property(a_1,alert_message_text,
登录失败,请返回重试);
n:=show_alert(a_1);
raise form_trigger_failure; --中断 FORM
End if;
End;
---对基表执行查询(只对基表)
Set_Block_Property(Block_Name,Default_Where,where ......);
Go_Block(Block_Name);
Execute_Query;
***************************************************
变量:
局部变量;
全局变量--------------1.:block.item
2.:parameter.v_name
3.:global.V_name

***************************************************
---同步发生显示
synchronize;
---实施TRIGGER触发
EXECUTE_TRIGGER(TRIGGER_NAME);
---清除模块
clear_block(NO_VALIDATE); NO_VALIDATE不生效
--建立警告栏并由警告栏选择
Declare
n number;
Begin
Set_Alert_Property(Alert_Name,Alert_Message_Text,message);
n:=Show_Alert(Alert_Name);
If n=Alert_Button1 then
...;
ElsIf n=Alert_Button2 then
...;
End if;
End;
---WINDOW设置
--运行时最大化,最小化
Set_Window_Property(FORMS_MDI_WINDOW, WINDOW_STATE, MAXIMIZE|MINIMIZE);
--WINDOW标题
Set_Window_Property(FORMS_MDI_WINDOW, title,TEXT);
--退出是否为真
Set_Window_Property(FORMS_MDI_WINDOW, REMOVE_ON_EXIT,PROPERTY_FALSE|TRUE);
---设置系统提示信息等级
:System.Message_Level:= 5|10|15|20;
---设置ITEM属性
--设置ITEM属性ENABLED
Set_Item_Property(Block_name.Item_name,ENABLED,PROPERTY_TRUE|FALSE);
--设置ITEM属性NAVIGABLE
Set_Item_Property(Block_name.Item_name,NAVIGABLE,PROPERTY_TRUE|FALSE);
--设置ITEM属性VISUAL_ATTRIBUTE
Set_Item_Property(Block_name.Item_name,visual_attribute,vname);
--vname由导航器中(VISUAL_ATTRIBUTES)定义
--设置ITEM属性DISPLAYED
Set_Item_Property(Block_name.Item_name,displayed,TRUE|FALSE);
--设置ITEM属性POSITION
Set_Item_Property(Block_name.Item_name,position,x,y);
--设置ITEM_SIZE
Set_Item_Property(Block_name.Item_name,item_size,x,y);
--设置ITEM属性LABLE
Set_Item_Property(Block_name.Item_name,LABEL,MESSAGE)
---设置LIST ITEM示范
Declare
n number;
Begin
clear_list(b1.fkfs);
m:=populate_group(fkfs);
populate_list(b1.fkfs,fkfs);
/*
其中FKFS 为 record group ;
*/
End;
---增加LIST ITEM
Add_List_Element(list_name, list_index, list_label, list_value);
Add_List_Element(list_id, list_index, list_label, list_value);
---删除LIST ITEM项
Delete_List_Element(list_name, list_index);
Delete_List_Element(list_id, list_index);
例:
BEGIN
Delete_List_Element(years,1);
Add_List_Element(years, 1, 1994, 1994);
END;
---获得LIST ITEM项的组成
1.获得LIST ITEM的总和
GET_LIST_ELEMENT_COUNT(list_id);
GET_LIST_ELEMENT_COUNT(list_name);
2.获得LIST ITEM的标签
GET_LIST_ELEMENT_LABEL(list_id, list_name, list_index);
GET_LIST_ELEMENT_LABEL(list_name, list_index);

3.获得LIST ITEM的值
GET_LIST_ELEMENT_VALUE(list_id, list_index);
GET_LIST_ELEMENT_VALUE(list_name, list_index);

---设置时间
DECLARE
timer_id Timer;
one

[1]

正在看的ORACLE教程是:ORACLE应用经验(1)。_minute NUMBER(5) := 60000;
BEGIN
timer_id := CREATE_TIMER(emp_timer, one_minute, REPEAT|NO_REPEAT);
END;
---产生一个EDITER框
DECLARE
ed_id Editor;
status BOOLEAN;
BEGIN
ed_id:=Find_Editor(edit_name); ---由edit_name导航器定义

IF NOT Id_Null(ed_id) THEN
Show_Editor(ed_id, NULL, :block_name.item_name, status);
ELSE
Message(Editor "Happy_Edit_Window" not found);
RAISE Form_Trigger_Failure;
END IF;
END;
----产生一个LOV框
DECLARE
lv_id LOV;
status BOOLEAN;
BEGIN
lv_id := Find_LOV(lov_name); ---lov_name 由导航器定义
-- IF Id_Null(lv_id) THEN
-- lv_id := Find_LOV(lov_name1); ---lov_name1 由导航器定义
-- END IF;
status := Show_LOV(lv_id,10,20);
END;
---定义一个EXCEPTION例外
Declare
err_1 exception;
Begin
If ... then
Raise err-1;
End if;
Exception
When err_1 then
....
END;
---设置应用特性(光标类型)
SET_APPLICATION_PROPERTY(CURSOR_STYLE,
CROSSHAIR|BUSY|HELP|DEFAULT|INSERTION);

***********************************************************************
**********************************函数*********************************
---把字符串的字符变成全大写(UPPER)全小写(LOWER)第一个字母大写(INITCAP)
UPPER|LOWER|INITCAP(STRING)
---在文件的左(LPAD)右(RPAD)粘贴字符
LPAD|RPAD(STRING,LENGTH,SET) "LENGTH"为总字符长"SET"为粘贴字符
---在文件的左(LTRIM)右(RTRIM)删除字符
LTRIM|RTRIM(SRTING,SET) "SET"为待删除字符
---找出字符集在字符串中的位置
INSTR(STRING,SET,N,M) 从STRING中找出SET从N位起第M个
---数的绝对值
ABS(VALUE)
---MOD模
MOD(VALUE,除数) 返回除数除VALUE的余数常用判断VALUE是否为整数
---把VALUE从N位四舍五入ROUND 或从N位截断TRUNC
ROUND|TRUNC(VALUE,N)
---返回VALUE的符号
SIGN(VALUE)

---列表的最大值
GREATEST(N1,N1...);
列表的最小值
LEAST(N1,N1...);
---返回小于或等于数的最大整数
FLOOR(VALUE) floor(1.3)=1 floor(-1.3)=-2
---返回大于或等于数的最小整数
CEIL(VALUE) cell (1.3)=2 cell (-1.3)=-1

---取字符串长度
substr(string,start,number) number为string长度,start为string起点

---DECODE函数,多重(if,then,else)
decode(value,if1,then1,if2,then2,.....,else)
---判断VALUE是否为空(空值替换)
NVL(UALUE,WKFHZ) WKFHZ是为空返回值,不为空则为原值
---字段长度
length(:block_name.item_id)
---返回字符串的第一(最左)个字符的ascII值
ascII(string)
---多行VALUE的 (作用于多行)
AVG(VALUE)平均值
COUNT(VALUE)行数
MAX(VALUE)最大值
MIN(VALUE)最小值
SUM(VALUE)和
---字符转换
TRANSLATE(STRING,待转字符,转换字符);
如 TEANSLATE(AAABBB,AB,BA) 返回BBBAAA

---比较单行中多个列的值获得最大(GREATEST最小(LEAST)
GREATEST|LEAST(列名,列名,...)
---按表达式或位置排序
ORDER BY 表达式OR位置 ASC|DESC ASC升,DESC降 默认ASC
***********************************************************************
***********************************************************************
---游标的属性
(1) %ISOPEN 打开属性 布尔型 打开为TRUE
判断光标是否打开如未打开则打开光标
IF NOT(CORSOR_NAME%ISOPEN) THEN
OPEN CORSOR_NAME;
END IF;
FETCH CORSOR_NAME INTO ...
(2) %NOTFOUND 布尔型 最近一次FETCH返回无结果 则为TRUE
OPEN CORSOR_NAME;
LOOP
FETCH CORSOR_NAME INTO ...
EXIT WHEN CORSOR_NAEM%NOTFOUND;
END LOOP;
(3) %FOUND 布尔型 最近一次FETCH返回无结果 则为FALSE
OPEN CORSOR_NAME;

WHILE CORSOR_NAME%FOUND LOOP
......
FETCH CORSOR_NAME INTO ...
END LOOP;
CLOSE CORSOR_NAME;
(4) %ROWCOUNT NUMVER型 为游标取出的行数
OPEN CORSOR_NAME;
LOOP
FETCH CORSOR_NAME INTO ...
EXIT WHEN CORSOR_NAME%ROWCOUNT>5;
......
END LOOP;
CLOSE CORSOR_NAME;

---循环语句
(1)基本循环
LOOP
.....
EXIT WHILE; 如(EXIT WHEN X>100)
END LOOP;
(2)WHILE循环
WHILE 如( WHEN X>100) LOOP

[2]

正在看的ORACLE教程是:ORACLE应用经验(1)。 .....
END LOOP;
(3)数值型FOR循环 X为计数器
FOR X IN (第减值) Y..Z LOOP
.....
END LOOP;
(4)游标FOR循环


---Exception(例外)在最近的BEGIN和END之间
Exception
语法1 当没有数据找到时
when no_data_found then
语法2 当发生任何错误时
when others then
语法3 当发现多行时
WHEN TOO_MANY_ROWS THEN
语法4 当字符向数字转换失败时
WHEN INVALID_NUMBER THEN
语法5 当被零除时
WHEN ZERO_DIVIDE THEN
语法6 当向唯一索引中插入重复数据时
WHEN DUP_VAL_ON_INDEX THEN
语法7 当非法游标操作时
WHEN INVALID_CURSOR THEN
语法8 当数字的,数据转换,截字符串或强制性的错误时
WHEN VALUE_ERROR THEN
**************************************************************************
**************************************************************************
--常用TEXT_IO
Delcare
out_file text_io.file_type;
Begin
out_file:=text_io.fopen(prn,w);
text_io.new_line(out_file, );
text_io.put_line(out_file, )
text_io.fclose(out_file);
End;
---文本输入输出
TEXT_IO
TEXT_IO PACKAGE
TEXT_IO FCLOSE
TEXT_IO.FILE_TYPE
TEXT_IO.FOPEN
TEXT_IO.IS_OPEN
TEXT_IO.GET_LINE
TEXT_IO.NEW_LINE
TEXT_IO.PUT
TEXT_IO.PUTF
TEXT_IO.PUT_LINE
USING TEXT_IO CONSTRUCTS
----------------------------
Declare
Out_file Text_io.file_type;
L Varchar2(100);
L1 Varchar2(100);
L2 Varchar2(100);
Begin
Out_file :=text_io.fopen(c:\ll\login.txt,r);
If text_io.is_open(Out_file) then
text_io.get_line(Out_file,L);
text_io.get_line(Out_file,L1);
text_io.get_line(Out_file,L2);
Else
Null;
End if;
End;
---清除全局变量
erase(global.var_name);
---隐藏WINDOW,VIEW,MENU
HIDE_WINDOW|VIEW|MENU(WINDOW|VIEW|MENU_name);
--- 增加参数add_parameter
Declare
pl_id ParamList;
BEGIN
pl_id:=Get_Parameter_List(tempdata);
IF NOT Id_Null(pl_id) THEN
Destroy_Parameter_List(pl_id);
END IF;
pl_id:=Create_Parameter_List(tempdata);
Add_Parameter(pl_id,EMP_QUERY,DATA_PARAMETER,EMP_RECS);
Run_Product(REPORTS,empreport,SYNCHRONOUS,RUNTIME,
FILESYSTEM,pl_id,NULL);
END;
---
DECLARE
lArgs OLE2.LIST_TYPE;
BEGIN
word.hApp:=OLE2.CREATE_OBJ(Word.Basic);
lArgs:=OLE2.CREATE_ARGLIST;
OLE2.ADD_ARG(lArgs,:ole.word_doc);
OLE2.INVOKE(Word.hApp,fileopen,lArgs);
OLE2.DESTROY_ARGLIST(lArgs);
END;
***********************删除重复记录**************
Delete from emp e
where e.rowid >
(select min(f.rowid) from emp f
4 where f.empno=e.empno);

[3]

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