dao

DAO, Spring and Hibernate

为君一笑 提交于 2019-12-07 02:07:20
问题 Correct me if anything is wrong. Now when we use Spring DAO for ORM templates, when we use @Transactional attribute, we do not have control over the transaction and/or session when the method is called externally, not within the method. Lazy loading saves resources - less queries to the db, less memory to keep all the collections fetched in the app memory. So, if lazy=false, then everything is fetched, all associated collections, that is not effectively, if there are 10,000 records in a

How can I programmatically authenticate user with Spring Security using DaoAuthenticationProvider

被刻印的时光 ゝ 提交于 2019-12-07 00:13:38
问题 I was wondering what I am doing wrong here to authenticate a user. I have an application where the user goes through several steps to activate their account, and upon doing so I would like to bypass the login form and take them directly to their dashboard. Here is what my automated login function looks like: protected void automatedLogin(String username, String password, HttpServletRequest request) { try { // Must be called from request filtered by Spring Security, otherwise

【分页查询测试】定义Dao接口

感情迁移 提交于 2019-12-06 20:17:31
本项目使用Spring Data Mongodb完成Mongodb数据库的查询,Spring Data Mongodb提供一套快捷操作 mongodb的方法。 创建Dao,继承MongoRepository,并指定实体类型和主键类型。 定义一个接口 public interface CmsPageRepository extends MongoRepository<CmsPage,String> { } 接口CmsPageRepository名字是因为要操作CmsPage集合下面的数据, Repository是固定写法继承的MongoRepository,要指定它的模型类和主键,比如这个主键是pageID,它的类型是String,所以写String。引用的这个包,里面会提供很多固定好的方法,可以直接拿来用。 来源: https://www.cnblogs.com/JS314/p/11997342.html

Hibernate Tools - DAO generation

这一生的挚爱 提交于 2019-12-06 14:39:55
I am using the eclipse hibernate tools plug-in to reverse engineer my database. I spent my whole day looking for how to force the DAO generator to use HQL/Criteria with the session factory, transaction, etc. Right now, if I have the table TABLE in my database, I obtain the DAO class TableHome. This class uses the persistence EntityManager. I found tutorials using an older version of hibernate tools generating TableDAO instead, and this is what I exactly need. Thank you very much. Whether you're using Eclipse or not is unclear but if you are, maybe check if the Console Configuration used by the

对 DAO 框架的初步构思

女生的网名这么多〃 提交于 2019-12-06 14:09:06
对 DAO 框架的初步构思 基础: 内置支持JDBC、Spring JDBC和MyBatis数据库访问 -- 抽象提供一致的使用接口 默认三种DAO代理对象访,支持XML动态配置 不依赖Spring 升级: 插件式连接池 插件式支持Spring 事务 多数据源配置 1.内置支持JDBC、Spring JDBC和MyBatis数据库访问 -- 抽象提供一致的使用接口。 请看下面的代码SessionMgr接口: SessionMgr<> { ()()} 代码中实现了简单的数据库操作会话的获取。对外暴露提供统一的接口。JDBC,SpringJDBC和Mybatis各会话管理实现类实现该接口。 自然这块还包括初始化,连接池,事务等工作。 2. XML动态配置 用户肯定说配置太麻烦了,那默认就是支持三种数据库操作会话。 但肯定会有独钟于其中一项的,比如Mybatis。请看下面一段XML配置: <!-- Session 管理器(可选) --> <!-- 可以配置多个,不同的 Session 管理器可使用不同的方式连接不同的数据库 --> <database-session-managers> <!-- name - 名称(必填),class - 管理器实现类(必填) --> <manager name ="session-mgr-jdbc" class ="org.fast.dao.jdbc

Session factories to handle multiple DB connections

寵の児 提交于 2019-12-06 12:36:20
I have a task to create multiple session factories for different Data Sources. One data source will be used for read requests and another for read-write requests. Each API of our Database Service(a wrapper over DAO) is executed as a transaction. Single API may call multiple DAO functions having different Read/Write property. What is the best possible way to perform this task? I am assuming that the different datasources are different DBs . Else you could use the readOnly attribute with the @Transactional annotation to manage the read only transactions. You could inject two separate session

MybatisGenerator生成SSM的dao层

孤者浪人 提交于 2019-12-06 12:19:30
官网下载 mybatis generator 下载generator的release版本 mybatis-generator-core-1.4.0-bundle.zip https://github.com/mybatis/generator/releases mybatis generator generator.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 数据库驱动--> <classPathEntry location="D:\workspace6_5\HjzzAuthPlatform\mysql-connector-java-5.1.22-bin.jar"/> <!--context:生成一组对象的环境 id:必选,上下文id,用于在生成错误时提示 defaultModelType:指定生成对象的样式 1,conditional:类似hierarchical

Mybatis整合spring(适合小白)

孤街浪徒 提交于 2019-12-06 11:38:44
目录 1. 整合思路 2.整合需要的jar包 3.整合的步骤 4. Dao的开发的两种实现方式 6、Dao的开发的实现方式总结图 @ Mybatis整合spring其实就是SSM框架中SM的整合集成。 1. 整合思路 整合的思路其实就是Mybatis整合spring的核心 1、SqlSessionFactory对象应该放到spring容器中 作为单例存在 ,spring默认是单例的。 2、传统dao的开发方式中,应该从spring容器中获得sqlsession对象。 3、Mapper代理形式中,应该从spring容器中直接获得mapper的代理对象。 4、数据库的连接以及数据库连接池事务管理都交给spring容器来完成。 2.整合需要的jar包 1、spring的jar包 2、Mybatis的jar包 3、Spring+mybatis的整合包。 4、Mysql的数据库驱动jar包。 5、数据库连接池的jar包。 jar包的话,希望在座各位最好都有,不然我就很尴尬QAQ 3.整合的步骤 3.1.创建工程 如下图创建一个java工程: 3.2.导入jar包 前面提到的jar包需要导入,如下图: 3.3.加入配置文件 1.mybatisSpring的配置文件 2.的配置文件sqlmapConfig.xml a)数据库连接及连接池 b)事务管理(暂时可以不配置) c

Specify Ordering to a DAO Method

烂漫一生 提交于 2019-12-06 11:18:23
Suppose I have the following DAO interface: public interface CountryData { /** * Get All Countries. * * @return A Collection of Countries. * @throws DataAccessException Thrown if there is an error communicating with the data store. The Exception's * Cause Exception can usually be examined to determine the exact nature of the * error. * @since 1.0.0 */ public List<Country> getAll(); } Further suppose that I am abstracting this DAO because I might provide 2 implementations, one for a database and one for a web service. I want to overload the getAll method to accept some sort of ordering

Null values are insering in data base using Struts2 and hibernate

此生再无相见时 提交于 2019-12-06 11:09:11
问题 I am using struts2 and Hibernate integration application to insert values in database. But after inserting values from form filed only null value is saving in database; this is my form jsp file employee.jsp <%@ taglib uri ="/struts-tags" prefix="s"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <s:form action="employee" method="post"> <s:textfield name ="name" label="ENTER your name"/> <s:textfield name=