how to handle exception

Paste the SqlHelper code: 001 /** 002 * function: encapsulate database operations 003 */ 004 005 package cn. zwh. util; 006 007 import java. SQL .*; 008 import java. util .*; 009 import java. io .*; 010 011 public class SqlHelper { 012 // database

The application information center module provides four services: log, exception, performance, and status. Let's take a look at the latest Log service definition: void Debug(string message); void Debug(string moduleName, string

Document directory Required Preparations Connected theoretical knowledge Connection test Perform SQL operations in Java Required Preparations 1. Install MySQL. For more information, see http://blog.csdn.net/jueblog/article/details/9499245 、to

When we execute a database query and return a resultset, we need to know the size of this resultset in many cases, that is, its number of rows and number of columns. We know that the number of columns can be easily obtained through resultset.

Analysis on the same-origin Policy Bypass Vulnerability in the File field of Android WebView 0x00 First, let's talk about the role of the webView method: webView.getSettings().setAllowFileAccessFromFileURLs(false);To illustrate this method, let's

The first article of the new year. Recently, I am working on a small Bluetooth Lock project. There is always a problem when the mobile phone is connected to the single-chip microcomputer, and the connection to the mobile phone is also unstable. I

Java transaction learning notes (9)-in-depth analysis of JTA principles and implementationThrough the study of java transactions in this series, I have a preliminary understanding of the concept of transactions. However, with the rapid development

Brief introductionException handling is one of the most important features of the Java language, as explained in the article "Three rules for effective Exception handling": It mainly helps us to solve the following three problems in the debug

Programming mistakes are inevitable, even a small error can lead to expensive costs, smart people are good at learning from mistakes, try not to repeat the mistakes, in this article, I will focus on C # developers most likely to commit the 7

This article introduces the content of the PHP programmer encountered errors and anomalies in the exception, now share to everyone, the need for friends can refer to Previous: Those years, Phper encountered errors and exceptions: The error of the

In the previous blog, I briefly introduced the simple communication of socket, which will be used in this blog. The next example is to refer to the secrets of Android Application development. However, there are some minor issues, such as character

64-bit multi-core MIPS exception and interrupt kernel code analysis (4)   1.3 initialization of other exception entries The entry for other exceptions is initialized: [ARCH/MIPS/kernel/traps. C] Void _ init trap_init () { ...... /** Copy the generic

Multi-thread interaction in android Service Android services and activities run in the main UI thread. In android threads, only the main thread (UI thread) has its own default message queue. The sub-thread needs to create its own message queue, send

In the Java multithreaded application, the queue usage is very high, most of the production consumption model's preferred data structure is the queue (FIFO). Java provides a thread-safe queue that can be divided into blocking queues and non-blocking

Java language Idioms 1. Cycle In an important cycle, the method call is eliminated when the loop terminates the judgment.For example: thefor (int i=0; iTo replace with ...for (int i=0; n=collection.size (); iUsually, move the loop index irrelevant

JavaScript is a world-leading programming language for Web development, mobile application development (PHONEGAP, Appcelerator), server-side development (node. js and Wakanda), and more. JavaScript is also the first language for many beginners to

Dark Horse Programmer _javase Study summary 19th day _io Stream 119.01 Summary of features and data structures of the integrated collection19.02 How to choose which collection to use19.03 Summary of common functions and traversal methods of the

A simple ASP. net mvc Exception Handling Module, asp. netmvc Exception Handling I. Preface Exception Handling is an essential part of every system. It allows our programs to prompt and record error information in case of errors, more importantly, it

There are too many JavaScript traps, so we have to step by step. I believe many of you will encounter the following points. I hope you will pay more attention to them. There are too many JavaScript traps, so we have to step by step. Below are some

At first I thought I could use the trimer control, but only then knew that when the trimer was set to 100 microseconds, the entire form would be loaded and unusable. =This use can only be used to load and delegate assignments using the loads.CPU