thumbtack jack

OC-collection class 1. the OC collection classes include nsarray, nsset, and nsdictionary. They all operate arrays in an object-oriented manner. Unlike arrays in C, OC Arrays can only store the same data type. They can store any type of objects, however, non-OC object types such as basic data types int, struct, and enum cannot be stored. 2. The OC array exists as an object. Therefore, you must add * 3. Once an nsarray array is created, it determines whether it is variable or not. 4. Basic ns

: the pear db module and the PHP Data Objects (PDO) class. Both provide abstraction from the choice of a specific database. Therefore, your code can run on IBM DB2, MySQL, PostgreSQL, or any other database you want to connect to without too much adjustment.Another value of using the pear db module and the PDO abstraction layer is that you can use it in SQL statements? Operator. This makes SQL easier to maintain and protects your applications from SQL injection attacks.The alternative code for us

Foreach is often used in PHP, and arrays must be used to use foreach. Therefore, in this article, we talk about arrays and foreach. Foreach is often used in PHP, and arrays must be used to use foreach. Therefore, in this article, we talk about arrays and foreach. Foreach has two syntaxes: First, traverse the given array statement array_expression array. In each loop, the value of the current unit is assigned to $ value and the pointer inside the array moves forward (so the next unit will be obt

execute the gzip or gunzip command tar to process the directory without deleting the source file. for example: tar-cvf/home/jack/dest.tar/home/jack/source package/home/jack/source into/home/jack/dest.tar-zcvf/home/jack/dest.tar.gz/ home/

When we use the "who" or "w" command on a Linux terminal, we will always see a long list of users. At this time, do you really want to send a message to him/her. If she is a long-time-honored MM, and you see her, she is also shy. Do you want to send a message to her and say "hello, you are also there ". Hey hey, are you looking forward to it? Let's introduce several commands to let you send them to her or him. Write: send messages to other users in the system. Usage: Write + User Name Write +

The dictionary is the Key-value data typeCreate info = { " stu01 " : " jack " Span style= "COLOR: #000000", " stu02 ": " Mike " ' stu03 " : " View CodeFeatures of the dictionary: Dict is disordered. Key must be unique and inherently heavy Increase>>>info[' stu05 ' = ' kit ' #自动创建 {' stu01 ': ' Jack ', ' stu02 ': ' Mike ', ' stu03 ': ' Jay ', ' stu05 ', ' kit '}By de

The use of foreach is often used in PHP, and if you use foreach, you must use an array. So in this article, we talk about the array, and we're talking about foreach. foreach has two kinds of syntax: First: Iterate over the given array statement array_expression array. In each loop, the value of the current cell is assigned to the $value and the pointer inside the array moves forward one step (so the next cell will be taken in the next loop). foreach (array_expression as $value)

key of the document that matches the criteria, and by default only updates the first qualifying document. You can specify that all eligible documents be updated by the last parameter of the update function$set Modify the contents of the matching document directly, if the modified key exists, it is modified directly, otherwise it is added. $unset Modifying the functionality that conforms to $set is the exact oppositeOperation of specific complex points see MONGO learning notes Data manipulationD

still very natural and harmonious, from where to obtain, constant filtration conditions, to choose the same or different, the order, that only know how to take the first few. That being the case, let's take a step-by-step look at the details.preparatory work1. Create a test databaseCreate DATABASE Testquery2. Create a test tableCREATE TABLE table1 ( uid varchar) NOT NULL, name VARCHAR (TEN) not NULL, PRIMARY KEY (UID)) Engine=innodb DEFAULT Charset=utf8; CREATE TABLE table2 ( oid IN

the age key of the document that matches the criteria, and by default only updates the first qualifying document. You can specify that all eligible documents be updated by the last parameter of the update function $set Modify the contents of the matching document directly, if the modified key exists, it is modified directly, otherwise it is added. $unset Modifying the functionality that conforms to $set is the exact opposite Operation of specific complex points see MONGO learning notes Data m

. replication of PythonAs seen from above, the assignment of an object is actually a reference to the object . When you create an object and then assign it to another variable, Python does not copy the object, but simply copies the object's reference.When you assign a value to an object (either as a parameter pass or as a return value), Python, like Java, always passes a reference to the original object, not a copy."" "passes a reference to the original object instead of a copy" "a = [1,2,3]b =

1. Common data typesName = "Jack" #字符串 stringage = 24# integer intheight =1.75# floating-point floatprint (Type (name), type (age), type (height))2. String and bytes type conversionmsg = "I love Beijing Tian ' an gate" print (Msg.encode (encoding= "Utf-8")) #字符串转bytes类型print (Msg.encode (encoding= "Utf-8"). Decode (encoding = "Utf-8")) #bytes类型转字符串3. DictionariesThe dictionary is another mutable container model and can store any type of object. Each k

+ this. age + "running... ";}; return obj;} var box1 = createObject (" lee ", 100); // instantiate; call the function and pass the parameter; var box2 = createObject (" jack ", 200); // instance 2; console. log (box1.run () + box2.run (); // The instance remains relatively independent; // disadvantage: the object and instance are identified; it is not clear whether they are the instance of that object; console. log (typeof box1); // Object; 3. creat

：[‘ZhangYang‘, ‘Guyun‘, ‘Xiangpeng‘, ‘Xuliangchen‘][‘ZhangYang‘, ‘Guyun‘, ‘Xiangpeng‘, ‘Xuliangchen‘]names--> [‘ZhangYang‘, ‘古云‘, ‘Xiangpeng‘, ‘Xuliangchen‘]names2--> [‘ZhangYang‘, ‘Guyun‘, ‘Xiangpeng‘, ‘Xuliangchen‘](11) List nested replication--copy.deepcopy:names = ["Zhangyang", "Guyun", ["Alex", "Jack"], "Xiangpeng", "xuliangchen"] Names2 = Names.copy () print (names) print ( NAMES2) names[1] = "Elegance" names[2][0] = "ALEX" #更改列表中的alex为ALEX, you

---------------------------------the slice schema diagram-------------------------------------------------------------------------------Slice 1 slice 2 slice 3| | |------------------|| | -----Configuration Server (Master)User----------> Routing-----------|-----configuration server (from 1)|-----configuration server (from 2)Note: After the MONGO 3.4 version, the configuration server must be a replica set, so you can see that the tutorial configuration server is an old version.---------------

del Mylis #窗口对象本身被销毁Ii. replication of PythonAs seen from above, the assignment of an object is actually a reference to the object . When you create an object and then assign it to another variable, Python does not copy the object, but simply copies the object's reference.When you assign a value to an object (either as a parameter pass or as a return value), Python, like Java, always passes a reference to the original object, not a copy."" "passes a reference to the original object instead of

obj;} var box1 = createObject (" lee ", 100); // instantiate; call the function and pass the parameter; var box2 = createObject (" jack ", 200); // instance 2; console. log (box1.run () + box2.run (); // The instance remains relatively independent; // disadvantage: the object and instance are identified; it is not clear whether they are the instance of that object; console. log (typeof box1); // Object; 3. Create an object using the constructor // EC

+ this. age + "running... ";}; return obj;} var box1 = createObject (" lee ", 100); // instantiate; call the function and pass the parameter; var box2 = createObject (" jack ", 200); // instance 2; console. log (box1.run () + box2.run (); // The instance remains relatively independent; // disadvantage: the object and instance are identified; it is not clear whether they are the instance of that object; console. log (typeof box1); // Object; 3. Creat