I encountered a problem in my project today, but I didn't pay attention to it before. I am using Spring MVC + Hibernate JPA + MySQL database. After data is inserted, an additional select statement is displayed in the SQL Execution log:Copy codeThe Code is as follows:Hibernate: insert into click_statstic (logDate, memoId, src, typeId) values (?, ?, ?, ?)Hibernate: select
; I 1; i++)//the loop uses each number compared to the number behind (the last one is not, so a. LENGTH-1){min= i;//min is used to dynamically store the index of the smallest number until she really holds a minimum number for(intj = i +1; J //The Next loop from the first number is compared with the first one { if(A[j] //when there are elements less than the first number,{min= J;//record the index of this number and put it in Min. Continue interna
First, select the sort
Concept Understanding:In an array of length 3, 3 data is traversed on the first pass to find the smallest value exchanged with the first element ;The second pass traverses 2 data to find the smallest element and the first number Exchange (note: The first number here refers to the first number of the traversal, which is essentially the second number of the array)And the third trip is to compare with yourself, position or th
First, select the sort
Concept Understanding:In an array of length 3, 3 data is traversed on the first pass to find the smallest value exchanged with the first element ;The second pass traverses 2 data to find the smallest element and the first number Exchange (note: The first number here refers to the first number of the traversal, which is essentially the second number of the array)And the third trip is to compare with yourself, position or th
By dom
// Use dom
$ ("Floatingfrequencycode"). Options. insertbefore (createoption (thestr, "01 "),
$ ("Floatingfrequencycode"). Options [0]);
// This method is required to generate optino
Function createoption (thetext, thevalue)
...{
VaR theoption = Document. createelement ("option ");
Theoption. innerhtml = thetext;
Theoption. value = thevalue;
Return theoption;
}
Function createoption (thetext, thevalue) not in Dom Mode)...{VaR theoption = Document. createelement ("option ");Theoption. Tex
Easy to understand:
Assume that the array length is 8 and the sequence number starts from 0.
1. Insert sorting:
(1) sorting is performed 7 times.
For (INT I = 1; I
For (Int J = I; j> 0; j --)
If (array [J-1]> array [J])
Swap (ref array [J-1], ref array [J]) the switching position ensures that the first I position of the array is sorted in order.
}
(2) duplicate (1 ).
2. Bubble Sorting:
(1) sorting is performed 7 times.
For (IN
Bubble Sorting code:
#include
Insert the Sorting code:
#include
Merge Sort code:
#include
Hill Sorting code:
void shellSort(ItemType theArray[], int n){ for (int h = n / 2; h > 0; h = h / 2) { for (int unsorted = h; unsorted
Quick Sort code:
int partition(int *arr,int low,int high){ int pivot=arr[high]; int i=low-1; int j; for(j=low;j
Select the Sorting code:
void selectionSort
New technologies are constantly changing. mastering some foundations is a solid foundation for learning and updating technologies in the future. Recently, I have nothing to worry about. To learn more about the previously learned data structure, I used JavaScript to implement the Sorting Algorithm in the data structure. Recently I started to learn about the data structure.
I hope to stick to it.
Because the direction is the frontend, it is implemented using JavaScript.
// Sort var testArr1 = [
Main solution: 1) Use Sessionfactory.getcurrentsession () when getting session in DAO, no sessionfactory.opensession (), otherwise the transaction cannot be submitted automatically. At the same time, the session cannot be closed automatically. 2) Add @transactional Transaction Management annotations on the Service Implementation class (Project is SSH integration, environment under MAVEN management)Hibernate annotation sequence generates a primary key after executing
The insertion is stable, the bubbling stability depends on whether there is an equal sign, and the selection is unstable#include The result is shownThree most basic sorts (insert, bubble, select)
[position] = current _valuedef Shell_sort (a_list): Sublist_count = Len (a_list)//2 while Sublist_count > 0:for start_position In range (Sublist_count): Gap_insertion_sort (A_list, start_position, sublist_count) print ("After Increme NTS of size ", Sublist_count," The list is ", a_list) Sublist_count = sublist_count//2def Gap_insertion_sort (a_list , start, GAP): For I in range (start + Gap, Len (a_list), gap): Current_value = a_list[i] Position = i While position >= Gap and A_list[posi
Package Com.wang.sort;import Java.util.arrays;public class Sort {/** * 1. Direct insertion Sort * Idea: The current number is compared with the number of rows already in the previous order, and inserted into the appropriate position * @param Arra */public void Simplesort (int[] arra) {for (int i = 1; i Eight basic sort (direct insert sort, hill sort, bubble sort, quick sort, merge sort, simple select sort
-table query once a month to generate a regional sales report.
AttentionPerhaps you want to define a primary key for the new table. When you create a new table, the fields in the new table inherit the data type and size of each field in the Query base table, but do not pass other fields or table properties.Use the INSERT into statement without creating an append search to add data to the current table.Before you run a make-table query, to know which r
Grammar
INSERT into Db1_name (field1,field2) SELECT field1,field2 from Db2_name
Instance
You can run the Insert...select syntax to solve the problem:
Insert into Hotel_ktv (Title,price, number,date,area,content,num) Select Tit
The base table is:Mysql>Select* fromStaff ;+----+----------+-------+| ID | name | Slary |+----+----------+-------+|3| Haofugui |10000||4| guoming |3500||5| Haotian |2900|+----+----------+-------+3Rowsinch Set(0.00sec) MySQL>describe staff;+-------+----------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+-------+----------+------+-----+---------+----------------+| ID |int( One) | NO | PRI | NULL | auto_increme
Want to insert a piece of data, to avoid repeated insertions, and do not want to toss two back to the database connection operation, you can refer to the following methods.SQL code
INSERT into table (Column1,column2,column3 ... columnn)
SELECT value1,value2,value3 ... Valuen
From dual
WHERE not EXISTS (
make-table query once a month to generate a regional sales report.
AttentionPerhaps you want to define a primary key for the new table. When you create a new table, the fields in the new table inherit the data type and size of each field in the Query base table, but do not pass other fields or table properties.Use the INSERT into statement without creating an append search to add data to the current table.Before you run a make-table query, to know w
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