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RSS订阅原创 JDBC（三）CRUD--增删改查
CRUD--增删改查一、JDBC的增删改查需要使用Statement类的实例去执行sql语句1、获取Statement实例使用Connection实例的createStatement()可以返回Statement实例2、Statement执行sql语句主要使用以下三个方法int execute(String sql): 可以执行增删改查所有语句，返回int类型，被sql...
2020-02-02 21:08:07
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原创 JDBC（二）抽取工具类：JDBCUtil.java
JDBC连接数据库步骤：1、加载驱动2、获取连接对象现在我们可以把这两步添加到一个工具类里，方便使用，使用时只需执行JDBCUtil.getConnection()方法即可获得连接对象一、抽取JDBC工具类1、创建JDBCUtil.java2、设置连接数据库的四个参数3、使用静态代码块加载数据库驱动，只要调用此类，静态代码块就会执行4、创建返回连接的方法...
2020-02-01 11:47:49
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原创 JDBC(一) 什么是JDBC?JDBC的简单使用
JDBC(Java Database Connectivity)：java数据库连接sun公司提供的一种java访问数据的规范。简单来说就是,就是能通过java代码连接并操作数据库一、为什么会出现JDBC呢？数据库的种类有很多，每种数据库的连接方式还不一样，sun公司就提供了一种规范，让数据库厂商根据这种规范去实现底层的访问规则。我们要连接数据库时，只需要使用sun公司提供的驱...
2020-01-31 19:02:49
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原创 2018暑假多校赛【第六场】【高中物理】-Pinball-YZHHHHHHH
PinballTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 447 Accepted Submission(s): 189Problem DescriptionThere is a slope on the 2D ...
2018-08-09 11:29:04
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原创 2018百度之星资格赛【莫队】-1002子串查询-YZHHHHHHH
子串查询Time Limit: 3500/3000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 356 Accepted Submission(s): 189Problem Description度度熊的字符串课堂开始了！要以像度度熊一样的天才为目标，努力...
2018-08-07 16:27:45
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原创 2018暑假多校赛【第五场】【全排列】-Beautiful Now-YZHHHHHHH
Beautiful NowTime Limit: 5000/2500 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 1746 Accepted Submission(s): 653Problem DescriptionAnton has a positive...
2018-08-07 15:49:19
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原创 2018暑假多校赛【第四场】-Problem D. Nothing is Impossible-YZHHHHHHH
Problem D. Nothing is ImpossibleTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 562 Accepted Submission(s): 329Problem Descriptionm ...
2018-08-02 15:53:53
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原创 2018暑假多校赛【第四场】【字符串】-Problem K. Expression in Memories-YZHHHHHHH
Problem K. Expression in MemoriesTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 887 Accepted Submission(s): 339Special JudgeProblem D...
2018-08-02 14:46:25
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原创 2018暑假多校赛【第三场】【亦或和】-Problem F. Grab The Tree-YZHHHHHHH
Problem F. Grab The TreeTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 363 Accepted Submission(s): 247Problem DescriptionLittle Q a...
2018-07-31 11:26:49
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原创 2018暑假多校赛【第三场】-Problem D. Euler Function-YZHHHHHHH
Problem D. Euler FunctionTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 1474 Accepted Submission(s): 1062Problem DescriptionIn n...
2018-07-31 10:57:49
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原创 2018暑假多校赛【第二场】【归并排序】【逆序数】-Swaps and Inversions-YZHHHHHHH
Swaps and InversionsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1662 Accepted Submission(s): 615Problem DescriptionLong long ago, ...
2018-07-28 20:33:27
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原创 2018暑假多校赛【第二场】【先手必赢】-Game-YZHHHHHHH
GameTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 431 Accepted Submission(s): 305Problem DescriptionAlice and Bob are playing a g...
2018-07-26 14:43:22
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原创 2018暑假多校赛【第二场】【构造】-Hack It-YZHHHHHHH
Hack ItTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 585 Accepted Submission(s): 183Special Judge Problem DescriptionTonyfang is a ...
2018-07-26 11:26:11
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原创 2018暑假多校赛【第一场】【优先队列】-Distinct Values-YZHHHHHHH
Distinct ValuesTime Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2558 Accepted Submission(s): 820Problem DescriptionChiaki has an array ...
2018-07-24 16:06:01
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原创 A - Chat Server's Outgoing Traffic CodeForces - 5A-YZHHHHHHH
A - Chat Server's Outgoing Traffic CodeForces - 5A Polycarp is working on a new project called "Polychat". Following modern tendencies in IT, he decided, that this project should contain chat as w...
2018-05-19 11:44:07
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原创 K-Nice ZOJ - 3212-YZHHHHHHH
题意：输出一个n*m的矩形，矩形要满足以下条件：1、矩形中有且仅有k个数等于它上下左右的数值总和2、处于边角的数不算代码：#include <stdio.h>int mapp[1005][1005];int main() { int t; while (scanf("%d",&t)!=EOF) { int n,m,k; whi...
2018-04-29 23:48:44
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原创 A - Second-price Auction ZOJ - 3202-YZHHHHHHH
A - Second-price Auction ZOJ - 3202 题意：找到输入最大值的下标，找到第二大值；第一个输出最大值的下标，第二个输出第二大值代码：#include <stdio.h>#include <algorithm>using namespace std;bool cmp(int x,int y){ return...
2018-04-29 22:43:01
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