sb r200

StringBuffer class1. OverviewStringBuffer is a thread-safe mutable stringWhat is the difference between 2.StringBuffer and string?StringBuffer the length and content of the former are variable, the latter is immutable.If you use the former to do string concatenation, it will not waste too much resources.How to construct 3.StringBufferPublic StringBuffer (): Non-parametric construction methodpublic stringbuffer (int capacity): Specifies the capacity of the string buffer objectPublic StringBuffer

; } PublicDataTable getdatatable (stringSqlparamsmysqlparameter[] Parameters) {DataSet DataSet=NewDataSet (); using(Mysqlconnection con =Newmysqlconnection (connectionString)) {con. Open (); using(Mysqlcommand cmd =Newmysqlcommand (sql, con)) { foreach(Mysqlparameter parameterinchparameters) {cmd. Parameters.Add (parameter); } Mysqldataadapter Adapter=Newmysqldataadapter (CMD); Adapter. Fill (DataSet); } } returnDataSet. table

I used to use the UpdatePanel updateprogress and other controls, and even to the extent of abuse, just blindly pursuit of no refresh, while the loading picture hints, this looks more beautiful, but feel more loss of performance, and sometimes also damaged the integrity of the site. But after learning Jquery, I learned about Jquery.ajax, jquery.get, and so on, so that we could use WebService and. ashx files to interact with the server. This jquery paging is in conjunction with the. ashx file. Se

50_create a dynamic class and view its method list, 50 dynamic Package com. itcast. day3; import java. lang. reflect. constructor; import java. lang. reflect. method; import java. lang. reflect. proxy; import java. util. collection; public class ProxyTest {public static void main (String [] args) throws Exception {Class clazzProxy1 = Proxy. getProxyClass (Collection. class. getClassLoader (), Collection. class); System. out. println (clazzProxy1.getName (); // com. sun. proxy. $ Proxy0/*** print

of the list of general user queues to prevent loss Set type (Sadd scard sismember Srem) collection content is not duplicated Sadd scard sismember Add/sum/whether in the collection Redis::sadd (' sa ', 1); Redis::sadd (' sa ', 2); Redis::sadd (' sa ', 3);dd(redis::scard (' sa ') );//Determine whether the set exists redis::sismember (' sa ', 1)//existence is 1, does not exist is 0sdiff to judge the difference set between two sets Redis::sadd (' SB ', 2

. Format (keyFormat, SelectClause, FromClause, WhereClause, GroupClause, SortClause );}/** // /// SQL statement that generates the total number of query records/// /// Public string GenerateCountSql (){StringBuilder sb = new StringBuilder ();Sb. AppendFormat ("from {0}", FromClause );If (WhereClause. Length> 0)Sb. AppendFormat ("where 1 = 1 {0}", WhereClause );If

Paging, cookies,session usageOne: Get paginationPublic partial class RNewsM:System.Web.UI.Page {private int pagecount = 0; A total of several pagesprivate int PageSize = 10; How many data on a pageprivate int _pageindex; Current Pagepublic int PageIndex {Get {Try {_pageindex = request.querystring["page"] = = null? 1:convert.toint32 (Request.querystrin g["Page"]. ToString ()); }Catch {_pageindex = 1; }return _pageindex; }set {_pageindex = value;}

Open dialog box saved as txt1 #region2 This. ddowntable = (DataTable) ( This. Dg1. DataContext);3 if( This. DDownTable.Rows.Count >0)4 {5 stringFName =string. Empty;6System.Windows.Forms.SaveFileDialog SaveFileDialog =NewSystem.Windows.Forms.SaveFileDialog ();7Savefiledialog.filter ="TXT FIlE (*.txt) |*.txt";8Savefiledialog.filterindex =2;9Savefiledialog.restoredirectory =true;TenSavefiledialog.filename ="solarprotonevents"; One

Public String topixelclickquerystring (bool appendall = false){Stringbuilder sb = new stringbuilder ();If (this. r> 0 | appendall) sb. append ("r =" + this. R). append ("");If (this. RT> 0 | appendall) sb. append ("RT =" + this. RT). append ("");If (this. A> 0 | appendall) sb. append ("A =" + this. a). append ("");If (

{_ sortclause = value ;}}/**//// /// Current page number/// Public int pageindex{Get {return _ pageindex ;}Set {_ pageindex = value ;}}/**//// /// Page size/// Public int pagesize{Get {return _ pagesize ;}Set {_ pagesize = value ;}}/**//// /// Generate the cache key/// /// Public String getcachekey (){Const string keyformat = "pager-SC: {0}-FC: {1}-WC: {2}-GC: {3}-SC: {4 }";Return string. Format (keyformat, selectclause, fromclause, whereclause, groupclause, sortclause );}/**//// /// SQL statem

{ Public static void main (string [] ARGs) throws exception { Class clazz = simplebean. Class; // Instantiate the bean using a non-argument Constructor Simplebean sb = (simplebean) clazz. newinstance (); system. Out. println (SB ); // Use the constructor with parameters to instantiate the bean Constructor = clazz. getconstructor (new class [] {string. class, string []. class});

Document directory 1. Request. applicationpath-> current application directory 2. Request. filepath-> corresponds to the virtual directory of IIS 3. Request. Path-> the virtual path of the current request 4. Request. mappath (string URL)-> map the URL to a virtual directory on IIS 5. server. mappath (string URL)-> map the URL to the physical path on the server. Physical path of the website on the server disk: httpruntime. appdomainapppathVirtual program path: httpruntime. appdomainappvi

. Later, I thought of xml configuration. The problem could be solved in both the flexibility of table body presentation and the data provision class. All these three functions use the POST method to pass the values. After understanding this, it is very convenient to directly splice SQL to complete these three functions, which is very simple. # Add region? Garó ,? Modify T ?,? Delete? Except y case "edit": String tablename = context. request. querystring ["tablename"]. tostring (); string id

ArticleDirectory 1. Request. applicationpath-> current application directory 2. Request. filepath-> corresponds to the virtual directory of IIS 3. Request. Path-> the virtual path of the current request 4. Request. mappath (string URL)-> map the URL to a virtual directory on IIS 5. server. mappath (string URL)-> map the URL to the physical path on the server. Physical path of the website on the server disk: httpruntime. appdomainapppathVirtualProgramPath: httpruntime.

Get the full absolute path to the projectString path = System.AppDomain.CurrentDomain.BaseDirectory.ToString ();String path = Server.MapPath ("."); /This "." Can be replaced by other folder names in the project fileOutput ASP. NET Web site pathprivate void responsehtml (){System.Text.StringBuilder sb = new System.Text.StringBuilder ();Sb. Append (String. Format ("Current time: {0}", Server.HTMLEncode (DateT

I. Appending and deleting strings using the StringBuilder class1. Creating an object of the StringBuilder classStringBuilder sb=new StringBuilder ("Initial string value");2.Append () Method stitching stringsSb. Append ("hehe");The result is: initial string value hehe3. Insert a string at the specified location using the Insert () methodSb. Insert (position, string);Sb. Insert (2, "on");The result is: Initia

Getcachekey (){Const string Keyformat = "Pager-sc:{0}-fc:{1}-wc:{2}-gc:{3}-sc:{4}";return string. Format (Keyformat, Selectclause, FromClause, Whereclause, Groupclause, Sortclause);} /**////SQL statement that generates the total number of query recordspublic string Generatecountsql (){StringBuilder sb = new StringBuilder (); Sb. AppendFormat ("from {0}", FromClause);if (Whereclause.length > 0)

I have obtained the project path through the experiment in the following ways: Obtain the complete absolute path of the project. String Path = system. appdomain. currentdomain. basedirectory. tostring (); String Path = server. mappath (".");// This "." can be changed to another folder name in the project file. Output Asp.net website path Private Void Responsehtml () {System. Text. stringbuilder sb = New System. Text. stringbuilde

Use of C ++ Nested classesThe nested class of C ++ refers to the class defined in the class. It is similar to the members of the peripheral class and is also modified by the corresponding access permission modifier.1. The nested class can directly carry static member variables in the peripheral class.2. Nested classes can access members of peripheral classes by referencing, pointer, or object, regardless of whether the Members are public, private, or protected.3 when a nested class is modified b

= "Pager-SC: {0}-FC: {1}-WC: {2}-GC: {3}-SC: {4 }"; Return string. Format (keyFormat, SelectClause, FromClause, WhereClause, GroupClause, SortClause ); } /** // /// SQL statement that generates the total number of query records /// /// Public string GenerateCountSql () { StringBuilder sb = new StringBuilder (); Sb. AppendFormat ("from {0}", FromClause ); If (WhereClause. Length> 0)