C # Final Solution for "cannot get exclusive access to a database because the database is in use"

1, the use of SQL statements to kill all the processes that are using the database, I used to do a SQL Server operation gadget has written this function of SQL, posted for your reference: DECLARE @dbname varchar set @dbname = ' Database name '

Lexical Analysis C language

#include #include char prog[80],token[8],ch;int syn,p,m,n,sum;char *keyword[6]={" Begin "," if "," then "," while "," does "," End "};void getsym (); main () {p=0; printf (" Please input a string (end With ' # '): "); do{scanf ("%c", &ch);

[C language] functions and debugging

Functions and debuggingDebug the normal program using GDB. But sometimes the bug is targeted and debugged by printing key information in the program using printf (). The next step is to improve through practice:1, development and debugging by using

C + + Skills regain 2

13. Class member function overloading:A function of the local name will hide instead of overloading the global Declaration, and without introducing the parent class namespace, a function with the same name as the subclass will not be overloaded with

C + + language, self-learning resources, rolling updates ...

No warranty updates, only guaranteed ... Rolling......First of all, "Yi Tong" is a very good learning and C + + language of self-study materials.Second, video tutorial: "Hao Bin C language 180 set full", the advantages are comprehensive coverage,

Merge_sort Merge sort C + + implementation

The following implementation of the merge sort, the first part of the Sentinel (algorithm from the introduction of the algorithm), the second part does not contain SentinelThe first part, containing the Sentinel's merge sort:#include using namespace

C Language Job 4

Greatest common divisor least common multiple#include intMain () {intM,n,temp,y; printf ("Please enter a two positive integer:"); scanf ("%d,%d",&m,&N); if(n>m) {temp=m; M=N; N=temp; } y=N; while(true) { if(m%n==0) {printf ("%d

C language implementation of the basic operation of the stack

#include   #include   #include   #include  typedef struct node{    int data;     Struct node * pnext;} node, * pnode;typedef struct stack{    pnode ptop;     pnode pbottom;} Stack, * pstack;     //pstack is equivalent to Struct stack *void init (

C + + Training: Language link Table Analysis

C + + training before a classmate again ask C language link table how broken? Today, small series of this knowledge points to share out, there are doubts can see more!650) this.width=650; "src=" Http://www.cdtedu.com/uploads/allimg/161009/1-161009105

Second assignment in C language

First, the contents of the experiment1-1 Test requirements: judge grade.Given a percentile grade, the grade of the output grade is required. 90 above is a,80-89 for b,70-79 for c,60-69 to d,60 and the following for E, input is greater than 100 or

C # console base byte array to UTF8 format string

1. Code1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespaceConsoleApplication38 {9 class ProgramTen { One Static voidMain (string[] args) A { -

C + + memory management

1. Stacks (Stack):Local variables (including function arguments) within the function are allocated by the compiler, the function ends, and the stack variable is invalidated.2. Heap:The memory requested by new, which is released by the delete.3. Free

C # Converts an enumeration into a dictionary collection

The use of enumerations in software development1. An enumeration type (enum type) is a unique value type with a set of named constants.2. Definition of enumeration: Public enum Sex { 0, 1 }Or: If only the male is

Stack application in-prefix expression calculation C # implementation

Support Decimal, factorial, power, subtraction, parentheses priority operations, beautify the output (show no extra 0 at the end of the result)void Ccaculator_littleduckdlg::onbnclickedbutton12 ()//The most critical code for the operation

Value types and reference types in C #

value types and reference types in the original C #Value type: Int,long,float,double,decimal,char,bool and struct are collectively referred to as value types. After a value-type variable is declared, the compiler allocates memory for it, regardless

C # Operations on files/directories: An analysis of Path, file, directory, FileStream, StreamWriter, StreamReader and other classes

One, path: The main operation of the file path!Common methods:String [email protected] "C:\a\b\c\123.txt";1-1, Path.getfilename (Path); Get file name:123.txt1-2, Path.getextension (Path); Get suffix name:.txt1-3, Path.getfilenamewithoutextension

The difference between string and StringBuilder in C #

String has its peculiarities in any language, as is the case in. Net. It belongs to the base data type and is the only reference type in the base data type. A string can be declared as a constant, but it is placed in the heap.One: non-changing

Quickly scan text files, count rows, and return the index position of each row (Delphi, C #)

12 million lines of text files need to be scanned by the project. Through the user's guidance and testing, found that the gap between C # and Delphi is not large. Not much to say, the Column code test:Here's the Delphi code:Traverse file to find the

C # notes-Delegates & Events

1.1. DelegationYou can think of a delegate as an object that holds one or more methods. Will execute all his "hold" methods when executed.You can see it. A type-safe, object-oriented C + + function pointerDelegates, like classes, are a type of user

GeekBand's first week study notes and geekband Study Notes

GeekBand's first week study notes and geekband Study NotesClass member Modifiers (Class member modifier) Public: can be accessed by any function or class. Private: cannot be accessed by external functions and classes of non-friends; Protected: can

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