
sql server if else語句(sql判斷語句if)

大家好,關(guān)于sql server if else語句很多朋友都還不太明白,今天小編就來為大家分享關(guān)于sql判斷語句if的知識(shí),希望對(duì)各位有所幫助!vf有效性規(guī)則里if語...
大家好,關(guān)于sql server if else語句很多朋友都還不太明白,今天小編就來為大家分享關(guān)于sql判斷語句if的知識(shí),希望對(duì)各位有所幫助!
vf有效性規(guī)則里if語句怎么用
在VF中,可以使用IF語句來執(zhí)行條件判斷,并根據(jù)判斷結(jié)果執(zhí)行不同的操作。以下是IF語句的一般語法:
sql
復(fù)制
IFconditionTHEN
statement1;
ELSE
statement2;
ENDIF
其中,condition是一個(gè)條件表達(dá)式,用于判斷是否滿足特定條件。如果condition為真,則執(zhí)行statement1,否則執(zhí)行statement2。
以下是一個(gè)示例,演示如何在VF中使用IF語句:
sql
復(fù)制
SETSERVEROUTPUTON;
DECLARE
numNUMBER:=10;
BEGIN
IFnum>0THEN
DBMS_OUTPUT.PUT_LINE('Numberispositive.');
ELSE
DBMS_OUTPUT.PUT_LINE('Numberisnon-positive.');
ENDIF
END;
/
在上面的示例中,如果num大于0,則輸出“Numberispositive.”,否則輸出“Numberisnon-positive.”。
需要注意的是,在VF中,IF語句可以嵌套使用,以實(shí)現(xiàn)更復(fù)雜的條件判斷邏輯。例如:
vbnet
復(fù)制
SETSERVEROUTPUTON;
DECLARE
numNUMBER:=10;
BEGIN
IFnum>0THEN
DBMS_OUTPUT.PUT_LINE('Numberispositive.');
IFnum>5THEN
DBMS_OUTPUT.PUT_LINE('Numberisgreaterthan5.');
ENDIF;
ELSE
DBMS_OUTPUT.PUT_LINE('Numberisnon-positive.');
ENDIF;
END;
/
在上面的示例中,如果num大于0,則輸出“Numberispositive.”,并且如果num大于5,則輸出“Numberisgreaterthan5.”。
php怎么連websocket
那是因?yàn)椋€沒有握手成功,并且這個(gè)in的處理不是針對(duì)客戶端的是針對(duì)服務(wù)端的這樣修改在websocket.class.php添加這兩行if(!$this->users[$k]['hand']){//沒有握手進(jìn)行握手$this->handshake($k,$buffer);$eventreturn=array('k'=>$k,'sign'=>$sign);$this->eventoutput('handsuccess',$eventreturn);}在server.php加一個(gè)elseif}elseif('handsuccess'==$type){//第一次握手成功$websocket->write($event['sign'],'welcome');}
Microsoft SQL Server如何創(chuàng)建,自定義函數(shù)
CreateFunctionRmGetPY(@chnnchar(1))
returnschar(1)
as
begin
declare@nint
declare@cchar(1)
set@n=63
select@n=@n+1,@c=casechnwhen@chnthenchar(@n)else@cendfrom(
selecttop27*from(
selectchn=
'吖'unionallselect
'八'unionallselect
'嚓'unionallselect
'咑'unionallselect
'妸'unionallselect
'發(fā)'unionallselect
'旮'unionallselect
'鉿'unionallselect
'丌'unionallselect
'丌'unionallselect
'咔'unionallselect
'垃'unionallselect
'嘸'unionallselect
'拏'unionallselect
'噢'unionallselect
'妑'unionallselect
'七'unionallselect
'呥'unionallselect
'仨'unionallselect
'他'unionallselect
'屲'unionallselect
'屲'unionallselect
'屲'unionallselect
'夕'unionallselect
'丫'unionallselect
'帀'unionallselect@chn)asa
orderbychnCOLLATEChinese_PRC_CI_AS
)asb
return(@c)
end
go
CreateFunctionGetAllPY(@chnnvarchar(100))
returnsvarchar(30)
as
begin
declare@iint,@jint,@resultvarchar(100)
set@result=''
set@i=len(@chn)
set@j=1
while@j<=@i
begin
set@result=@result+dbo.RmGetPY(substring(@chn,@j,1))
set@j=@j+1
end
return@result
end
看看這兩個(gè),典型的取漢字拼音碼的函數(shù)
sql server中怎樣查詢引起死鎖的sql語句
elect0,blockedfrom(select*fromsysprocesseswhereblocked>0)awherenotexists(select*from(select*fromsysprocesseswhereblocked>0)bwherea.blocked=spid)unionselectspid,blockedfromsysprocesseswhereblocked>0OPENs_curFETCHNEXTFROMs_curINTO@spid,@blWHILE@@FETCH_STATUS=0beginif@spid=0select'引起數(shù)據(jù)庫死鎖的是:'+CAST(@blASVARCHAR(10))+'進(jìn)程號(hào),其執(zhí)行的SQL語法如下'elseselect'進(jìn)程號(hào)SPID:'+CAST(@spidASVARCHAR(10))+'被'+'進(jìn)程號(hào)SPID:'+CAST(@blASVARCHAR(10))+'阻塞,其當(dāng)前進(jìn)程執(zhí)行的SQL語法如下'DBCCINPUTBUFFER(@bl)
怎么樣配置thinkphp與本地mysql和sqlserver同時(shí)連接倆個(gè)數(shù)據(jù)庫
thinkphp同時(shí)連接兩個(gè)數(shù)據(jù)庫的配置方法如下:
1、在Db.class.php腳本文件里面的類增加一個(gè)魔術(shù)方法__get(),寫法如下:publicfunction__get($propertyName){return$this->$propertyName;}這個(gè)方法是用來訪問類中protected$config成員屬性用的。有的人可能會(huì)說,直接把protected改成public豈不是更好。這樣只解決了基類的問題,假如,子類也同樣進(jìn)行了受保護(hù),那要你更改更多的文件,這是我們做IT程序員非常不愿意看到的事情。
2、在Model.class.php中的getTableName()方法更改如下:$tablepre=$this->db->config['tablepre'];if(empty($this->trueTableName)){$tableName??=empty($tablepre)?$this->tablePrefix:$tablepre;if(!empty($this->tableName)){$tableName.=$this->tableName;}else{$tableName.=parse_name($this->name);}$this->trueTableName??=??strtolower($tableName);}return(!empty($this->dbName)?$this->dbName.'.':'').$this->trueTableName;這樣就完成了多庫自由切換時(shí),導(dǎo)致的表前綴問題。/*******************面向?qū)ο驪DO連接方式*********************/'DB_TYPE'=>'PDO',//數(shù)據(jù)庫類型'DB_DSN'=>'mysql:host=localhost;dbname=master',//DSN連接。'DB_USER'=>'root',//數(shù)據(jù)庫用戶名'DB_PWD'=>'123456',//數(shù)據(jù)庫密碼'DB_PORT'=>'3306',//數(shù)據(jù)庫端口'DB_PREFIX'=>'g_',//數(shù)據(jù)表前綴'DB_CHARSET'=>'utf8',//數(shù)據(jù)庫編碼默認(rèn)采用utf8
關(guān)于sql server if else語句,sql判斷語句if的介紹到此結(jié)束,希望對(duì)大家有所幫助。
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