decryption syntax is simple.-- Use the DESX algorithm to create a symmetric key named sym_key_001, and then use the certificate cer001 to encrypt the new key.Create policric key sym_key_001With algorithm = DESXEncryption by certificate cer001;Go-- Fill dataSet nocount on;Select CreditCardID, CardNumber into dbo. t5 from Sales. CreditCard;Go-- Add encrypted ColumnsAlter table dbo. t5 add SymKeyEncryptionENu
One, the environmentIdeaTwo. What is a thread safety issue and why is it wired security?Thread-safety issues arise when multiple threads concurrently access shared resources (typically queries are not generated)Three. For exampleIf I wanted to say a few Xunhua plus one, it would eventually increase to 1000. But 5 threads are required to addclassCountImplementsrunnable{Private intCount=1; Public voidrun () { while(count) {Count=count+1; System.out.println (Thread.CurrentThread (). GetName ()+ ",
Overview
As we all know, Access databases do not support a time based blind method, but we can use the system table MSysAccessObjects of access to implement it through a load query (Heavy Queries).
Preliminary exploration
We take the SOUTHIDCV17 database as an example
Executes the SELECT * from Southidc_about, returning the results shown below.
How do I implement time base injection? We're going to use this statement.
SELECT Count (*) from msysaccessobjects as T1, msysaccessobjects as T2
Access is a database management system that Microsoft combines the graphical user interface of the database engine with the software development tools. This article looks at the implementation record of the Access database based on the time SQL blind.
Overview
As we all know, Access databases do not support a time based blind method, but we can use the system table MSysAccessObjects of access to implement it through a load query (Heavy Queries).
Preliminary exploration
We take the SOUTHI
places. This article takes 7 decimal places, takes pi=3.1415927 as an example to calculate, at this time the computation only needs to iterate 5 times, can satisfy the question condition. The corresponding MATLAB program is given below
m_pi=3.1415927; % 7 Decimal t0=m_pi* (2*m_pi*sin (2*M_PI)); % T00 k=0 T0=VPA (t0,8) n=2;
%k=1 j=1;
sum=0;
For I=1:1:n sum=sum+ (j*m_pi/n) * (sin (j*m_pi/n));
j=j+2;
End sum=sum*m_pi/(N);
T1=t0/2+sum; T1=VPA (t1,8)%t01 n=4;
%k=2 j=1;
sum=0;
For I=1:
)INNER JOIN (select Fserialid from V_bd_overaserialorgview where fserialid>1 and fstockstatus = 1) uu on UU. Fserialid=t0. FserialidINNER JOIN (select Fmaterialid,fname fspmc from t_bd_material_l where fmaterialid>1 and Flocaleid = 2052) tll on T0.F Materialid =tll. FmaterialidINNER Join (select Fcategoryid,fmaterialid from T_bd_materialbase where fcategoryid>1 and Fcategoryid = ' 2092334 ') m On t0. Fmaterialid=m.fmaterialidLeft JOIN (select Fserialid,min (finputdate) finputdate from (select A.
Tags: har last select group by CDP Lis var res whereParametertype= "com.dsunsoft.cqhzz.sql.dto.I0203.I0203F0004SQL001DbcIU001"Resulttype= "com.dsunsoft.cqhzz.sql.dto.I0203.I0203F0004SQL001DbcOU001" >SELECTT1. user_id as UserId,T1. User_nm as USERNM,T2. Emp_nm as EMPNM,T1. PWD as PWD,T1.tel as TEL,T1. E_Mail as EMail,T1. We_chat as WeChat,T1. emp_id as EmpId,T1. Created_by as CreatedBy,T1. Created_date as CreatedDate,T1. Last_modified_by as Lastmodifiedby,T1. Last_modified_date as LastModifiedDat
Runnable interface Thread t1 = new MyThread (); Thread t2 = new MyThread (); thread t3 = new MyThread (); Thread t4 = new MyThread (); Thread t5 = new MyThread (); // put the Thread into the pool and execute pool.exe cute (t1 ); pool.exe cute (t2); pool.exe cute (t3); pool.exe cute (t4); pool.exe cute (t5); // close the thread pool. shutdown ();}}
Output result
Pool-1-thread-1 is being executed... Pool-1-t
MyThread (); Thread T4 = new MyThread (); Thread T5 = new MyThread (); Put the thread into the pool for execution pool.execute (t1); Pool.execute (T2); Pool.execute (T3); Pool.execute (T4); Pool.execute (T5); Close the thread pool pool.shutdown (); }}Output resultsPool-1-thread-1 is executing ... Pool-1-thread-1 is executing ... Pool-
Problem description
Poj 1700
On a dark night, n came to the narrow bridge without guardrails for travelers. If you do not use a flashlight, you will not dare to cross the bridge in any way. Unfortunately, N people only carry one flashlight, while the bridge is narrow enough to let two people pass simultaneously. If they bridge the bridge separately, the time required by N people is known. If the two bridge the bridge at the same time, the time required is the time required for a person to take a
unlimited size. This thread pool supports the need to schedule and periodically perform tasks.Instance1:newsinglethreadexecutorMythread.java Public class extends Thread { @Override publicvoid run () { + "is executing ... "); }}Testsinglethreadexecutor.java Public classTestsinglethreadexecutor { Public Static voidMain (string[] args) {//Create a thread pool that can reuse a fixed number of threadsExecutorservice Pool=executors. Newsinglethreadexecutor (); //The runnable interfac
t0.location_dest_id=get_warehous e_id (' into position ')) or ((t0.location_id=get_warehouse_id (' original position ') and t0.location_dest_id=get_warehouse_id (' Customers ')) or (t0.location_id=get_warehouse_id (' Customers ') and t0.location_dest_id=get_warehouse_id (' original position '))) GROUP by t0.product_id,ref_num,ref_line_id ) t where ref_line_id in%s" ", (Tuple (IDs),)) Jhqty= Dict (Cr.fetchall ())or create viewsInitialize executing functions: Cr
DEF init (SELF,CR):Tools.sql.drop_view_if_exists (CR,' Custrom_product_infomation_report ')Cr.execute ("""Create or Replace viewcustrom_product_infomation_report as (Select t0.id,t0.hpartner_id as hpartner_id, T0.khwl_code as khwl_code,t1.product_tmpl_id as PRODUCTN,T3.pname,t3.material,t3.spec,T4.id as Name_uom, T5.price as Custo_price,t0.product_meno as Product_meno, T0.meno as Meno,t5.date_from,
: postgres=> insert into t4 (name) VALUES (' AA ');
Error:permission denied for sequence T4_id_seq The solution is to assign a sequence value again. Postgres=> \c-postgres You is now
connected to database "Postgres" as User "Postgres".
postgres=# alter default privileges in the schema public grant usage on sequences to U2;
ALTER DEFAULT Privileges
postgres=# CREATE TABLE T5 (ID serial, name varchar);
CREATE TABLE
postgres=# \c-u2 You is now
connected
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