dao

My web application has got a lot of service tables/entities, such as payment_methods , tax_codes , province_codes , etc. Each time I add a new entity, I have to write a DAO. The thing is that, basically, they are all the same, but the only difference is the entity class itself . I know that Hibernate tools can generate the code for me automatically but I can't use them now (don't ask why) so I'm thinking of a Generic DAO . There's a lot of literature about that but I can't put pieces together and make it work with Spring. It's all about generics I think, it will have four basic methods:

It is often useful to have a field in a DAO whose value comes from a Java enumeration. A typical example is a login DAO where you usually have a field that characterises the user as "NORMAL" or "ADMIN". In Hibernate, I would use the following 2 objects to represent this relationship in a (semi-)typesafe way: class User { String username; String passwd; UserType type; } class UserType { private enum Type {ADMIN, NORMAL}; private String type; //Setters/Getters for Hibernate public void setType(String type); public String getType(); //Setters/Getters for user public void setUserType(UserType.Type

This question already has an answer here: Java EE Architecture - Are DAO's still recommended when using an ORM like JPA 2? 2 answers I'm designing a new app based on JPA/Hibernate, Spring and Wicket. The distinction between the DAO and Service layers isn't that clear to me though. According to Wikipedia, DAO is an object that provides an abstract interface to some type of database or persistence mechanism, providing some specific operations without exposing details of the database. I was wondering whether a DAO could contain methods that don't really have to do much with data access, but are

添加Dao层 <?php $tables = <<<EOF -- 资讯 - 分类表 DROP TABLE IF EXISTS `category`; CREATE TABLE `category` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '分类主键id', `category_name` varchar(50) NOT NULL DEFAULT '' COMMENT '分类名称', `parent_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT '分类的父类ID', `cms_total` int(10) NOT NULL DEFAULT '0' COMMENT '该分类下cms总数', `sort` int(10) NOT NULL DEFAULT '0' COMMENT '排序（权重大越靠前）', `status` tinyint(2) NOT NULL DEFAULT '1' COMMENT '状态 1:正常 3:删除', `extend` json NOT NULL, `create_time` int(10) unsigned NOT NULL, `update_time` int(10) unsigned NOT NULL, `cas

In my Access datebase I have a two tables: Table1: PersNum Name Surname 2321 Lenora Springer 2320 Donya Gugino 3326 Leland Wittmer 4588 Elmer Mcdill Table2: PersNum Name Surname 2321 Lenora Farney 2320 Donya Willimas 3326 Leland Wittmer 4588 Maya Mcdill 7785 Yolanda Southall 1477 Hailey Pinner I need to find a way to check the personal number (field "PersNum"), and then if PersNum exist, update Name and Surname in Table1. If PersNum doesn't exist, insert new row in Table1. Expected results: PersNum Name Surname 2321 Lenora Farney (updated surname) 2320 Donya Willimas (updated surname) 3326

I am using Spring MVC with Hibernatedaosupport for my DAO classes. Confused here where to start the transaction, whether it should be in service layer or DAO layer? My view interacts with Service layer. DAO's are injected into services. What is the right way to use Spring MVC with Hibernate in DAO, service layer architecture? IMHO the transactions should go to service layer. Typically one business transaction consists of several queries and updates. If you place @Transactional only on DAO layer, each query and update will run in a separate transaction, which effectively defeats the purpose of

#0 系列目录# 深入浅出MyBatis系列 【深入浅出MyBatis系列一】MyBatis入门 【深入浅出MyBatis系列二】配置简介（MyBatis源码篇） 【深入浅出MyBatis系列三】Mapper映射文件配置 【深入浅出MyBatis系列四】强大的动态SQL 【深入浅出MyBatis系列五】SQL执行流程分析（源码篇） 【深入浅出MyBatis系列六】插件原理 【深入浅出MyBatis系列七】分页插件 【深入浅出MyBatis系列八】SQL自动生成插件 【深入浅出MyBatis系列九】改造Cache插件 【深入浅出MyBatis系列十】与Spring集成 【深入浅出MyBatis系列十一】缓存源码分析 【深入浅出MyBatis系列十二】终结篇：MyBatis原理深入解析 单独使用mybatis是有很多限制的（ 比如无法实现跨越多个session的事务 ），而且很多业务系统本来就是使用spring来管理的事务，因此mybatis最好与spring集成起来使用。 #1 Spring集成配置# <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="datasource"></property>

I found some code on an ancient message board that nicely exports all of the VBA code from classes, modules and forms (see below): Option Explicit Option Compare Database Function SaveToFile() 'Save the code for all modules to files in currentDatabaseDir\Code Dim Name As String Dim WasOpen As Boolean Dim Last As Integer Dim I As Integer Dim TopDir As String, Path As String, FileName As String Dim F As Long 'File for saving code Dim LineCount As Long 'Line count of current module I = InStrRev(CurrentDb.Name, "\") TopDir = VBA.Left(CurrentDb.Name, I - 1) Path = TopDir & "\" & "Code" 'Path where

采用@Param的方法可有多个参数 public void abc(@Param("userName") String name,@Param("password") String passWord); 而xxMapper.xml中的#{}中的参数则是根据@Param括号中的参数来获取相应的数据 <select> select * from testTable where username = #{userName} </select> 来源： https://www.cnblogs.com/welearn/p/11350083.html

I am currently developing a web application using Struts2 with Spring plugin and hibernate and while I was looking at online examples I saw the use of Service and DAO layers now it came to me what are the real use of Service and data access object layers? If The Service layer is just calling the methods of DAO layers to perform CRUD operations. wouldn't be sensible to just call the DAO layers methods directly? Let's say this example of Dao and Service Layer PeopleService @Transactional public class PeopleService { private PeopleDao pDao; public PeopleDao getPDao() { return pDao; } public void