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|bar/" becomes the following form: "/Foo|Bar/x " In the Python language, pass the schema modifier parameter "re." VERBOSE "gets the compiled function as follows: Pattern = R ' 'Foo|Bar'''Regex = Re.compile (pattern, re. VERBOSE) Spaces and annotations are more important when dealing with more complex regular expressions. Suppose the following regular expression is used to match the U.S. phone number: \ (? \d{3}\)?? \d{3}[-.] \D{4} This regular expression matches the phone number in the form of "

after the update can we see what value the database assigns to it, and then use this ID as the OrderID value of the OrderDetail table. Finally, update the Oderdetail table. However, to ensure data consistency, the order and OrderDetail must be updated at the same time under transaction protection, that is, to make sure that the two tables are more successful at the same time, this is a bit disturbing. There are two main types of approaches to solving such problems: One is the method used by Mic

() LENGTH () C1 is a string that returns the length of the C1 and, if C1 is null, returns a null value. Select LENGTH (' Ipso Facto ') ergo from Dualergo10 LENGTHB () Returns the byte, as in length (). Lower () Returns lowercase characters for C, which often appear in the Where substring Select LOWER (colorname) from Itemdetail WHERE LOWER (colorname) like '%white% ' colornamewinterwhite Lpad (, C1,C2 are all strings, I is an integer. On the left

', -2,3) from dual;INSTR (' Mississippi ', ' I ', 3, 3)2INSTRB (, [, I[,j])As with the InStr () function, it is just that he returns a byte, for a single byte InStrB () equals InStr ()LENGTH ()C1 is a string that returns the length of the C1, and if C1 is NULL, a null value is returned.Select LENGTH (' Ipso facto ') ergo from dual;Ergo10LENGTHB ()As with length (), returns the byte.Lower ()lowercase characters that return C, often appearing in the Wh

optimized at the SQL level, we can consider vertical data splitting. Here is an experiment: -- Manufacturing data is not vertically split Create table test ( A number, B varchar2 (4000 ), C varchar2 (4000 ), D varchar2 (4000 ), E varchar2 (4000 ), F varchar2 (4000 ), G var

SourceAddress: IP Destionation Address: Options: optional field. Padding indicates that 32 bits is not enough to be filled with 0. For example, I caught such a package with tcpdump: 00:05:36. 631501 IP localhost.54504> localhost.9889:Flags [P.], seq 4289908547: 4289908560, ack 2355231328,Win 2050, options [nop, nop, TS val 28499978 ecr 28495907], length130 × 0000: 4500 0041 1f63 4000 4006 1d52 7f00 0001 E... A. c @. @. R ....0 × 0010: 7f00 0001 d4e

First, create a table named chineseword (simpleword, traditionword) that stores simplified and traditional Chinese characters) Then, write a stored procedure to insert data into the chineseword table. Create or replace procedure insertchineseword iss_str1 varchar2 (4000); s_str2 varchar2 (4000); s_str3 varchar2 (4000); s_str4 varchar2 (

the compilation function as follows:Pattern = r '''Foo Bar'''Regex = re. compile (pattern, re. VERBOSE)When processing more complex regular expressions, spaces and comments are more important. Assume that the following regular expression is used to match the telephone number in the United States:\(? \ D {3 }\)? ? \ D {3} [-.] \ d {4}This regular expression matches the phone number in the form of "(314) 555-4000". Do you think this regular expression

"/foo|bar/" becomes the following form: "/ Foo Bar /x " In the Python language, pass the schema modifier parameter "re." VERBOSE "gets the compiled function as follows: Pattern = R ' ' Foo Bar ''' Regex = Re.compile (pattern, re. VERBOSE) Spaces and annotations are more important when dealing with more complex regular expressions. Suppose the following regular expression is used to match the U.S. phone number: \ (? \d{3}\)?? \d{3}[-.] \D{4} This regular expression matches the phone number in

NAT principles and NAT traversal technical principles and implementation recently, when reading things, I found that many network programs need NAT traversal. I would like to summarize it here. First, make an agreement: Intranet A has: A1 (192.168.0.8), A2 (192.168.0.9) Dual-user gateway X1 (a nat device) has A public IP address 1.2.3.4 Intranet B has: B1 (192.168.1.8) b2 (192.168.1.9) dual-purpose users, Gateway Y1 (a NAT device) has a public IP address 1.2.3.5 public network server: C (6.7.8.9

compilation function as follows:Pattern = r '''FooBar'''Regex = re. compile (pattern, re. VERBOSE)When processing more complex regular expressions, spaces and comments are more important. Assume that the following regular expression is used to match the telephone number in the United States:\(? \ D {3 }\)? ? \ D {3} [-.] \ d {4}This regular expression matches the phone number in the form of "(314) 555-4000". Do you think this regular expression match

this feature? The regular expression of Perl 6 defaults to the space extension mode. Do not extend the space for your language by default. take the initiative to use it.One of the tricks to remember to expand spaces is to let the regular expression engine ignore the extended space. In this way, if you need to match spaces, you have to explicitly describe them.In Perl, add x to the end of the regular expression, so that "m/foo bar/" becomes the following form: M/Foo　Bar/X In PHP, add x to the en

} [-.] d {4} This regular expression matches the phone number in the form of "(314) 555-4000". do you think this regular expression matches "314-555-4000" or "555-4000? The answer is that the two do not match. Writing such a line of code hides the disadvantages and design results. The telephone area code is required, but the regular expression lacks a description

extended space. In this way, if you need to match spaces, You Have To explicitly describe them.In Perl, add x to the end of the regular expression, so that "m/foo bar/" becomes the following form: M/Foo　Bar/X In PHP, add x to the end of the regular expression, so that ""/foo bar/"is changed to the following form: "/Foo　Bar/X" In Python, the pass mode modifier parameter "re. VERBOSE" gets the compilation function as follows: Pattern = rFoo　BarRegex = re. compile (pattern, re. VERBOSE) When proce

|+----+------+|56 | 7000 |+----+------+1 row in Set (0.00 sec) Consistent with last query results, verified repeat read ... At this point, if Session1 commits the transaction and re-opens the transaction, the query can find the result modified in Session2 Mysql> commit;Query OK, 0 rows Affected (0.00 sec) mysql> SELECT * from t1 where a = 56;+----+------+|A |b |+----+------+|56 | 8000 |+----+------+1 row in Set (0.00 sec) The Phantom reading under the Repeatable-readSession1 Mysql> begin;Query

This article mainly introduces parameter passing and calling of setTimeout and setInterval functions in JavaScript, two functions can insert the code to be executed into a code queue maintained by the js engine at a set time point. For more information, see How to pass parameters to setTimeout and setIntervalSee the following code: var str = 'aaa'; var num = 2; function auto(num){ alert(num); } setTimeout('auto(num)',4000); In this way, the writ

-- SQL decryption ctext field Content Function-- Exec sp_decrypt 'constraint name'-- Exec sp_decrypt 'df _ insurancerecord_periodunit'-- Exec sp_decrypt 'stored procedure name'-- Exec sp_decrypt 'SP _ searchprinting_insurancerecord' -- Main purpose: Read the field content in systemcomments. Including constraints and stored procedures. -- The original text should be from idea. Saving me a lot of time. I was going to first find the crack Function in the ox character transfer format, or the conten

How to pass parameters to SetTimeout, setintervallook at the following code: var str = ' AAA '; var num = 2; function Auto (num) { alert (num); } SetTimeout (' Auto (num) ', 4000); This is a good way to write, but as it says this is a parameter pass, it's more of a global variable that is used directly. Therefore, this writing is not necessary, in general, more is used to pass local variables as parameters. Modify the code:

. designer. cs, where the DataContext class is the main entry point of linq to SQL, that is, the database context that we often refer. Now, the ing relationship with the database has been completed. Let's take a look at the operations related to linq to SQL. Add 1 static void Main (string [] args) 2 {3 // create a database context object 4 Linq2SqlDataContext context = new Linq2SqlDataContext (); 5 TB_Customer customer = new TB_Customer () {ID = 1, Name = "wolfy", Address = "Beijing Haidian"};

Tags: man--Observation information name IDC Lin ble valueOracle defines string types VARCHAR2 and char specify the length of the usage as follows: VARCHAR2 (char (What's the difference between a byte and a char?Byte, specified in bytes: VARCHAR2 (ten byte). This can support up to 10 bytes of data in a multibyte character set, which may be just two characters. When using multibyte character sets, bytes are not the same as characters. Char, specified by character: VARCHAR2 (ten CHAR). This will su