mapper lithography

When using MyBatis docking data, manual write Mapper,model,client will be time-consuming, you can try mybatis_gererator to generate more difficult mybatis configuration files.Start with MyEclipse to create the Java project.Place the Mysql-connector-java-5.1.18.jar in the specified directory project and configure Generatorconfig.xml.generatorconfiguration> classpathentrylocation ="/opt/app-w/gitresp/testcore/src/main/webapp/web-inf/lib/ Mysql-connec

AutoMapper. Mapper. CreateMap reports "System. NullReferenceException: the object reference is not set to the instance of the object ." Recurrence of exceptions, Navigation: > I. problems during the National Day holiday > II. An exception occurs again on weekends. > III. troubleshooting > IV. Abnormal Replay > V. Post-repair monitoring > VI. End I. TOP problems during the National Day holiday During the National Day holiday-July 22, October 5-the paym

1. Default URL mapper, adapter, and view resolverSPRINGMVC provides the default URL mapper, adapter, and view resolver.In the previous article, the Springmvc-helloworld.xml content is as follows:The above configuration is the same as the following configuration:2. View Resolver internalresourceviewresolverFunction: Parse the actual path of the view logical nameThe Modelandview object can encapsulate the tru

Using MyBatis generator can generate mybatis corresponding mapper and model according to the database table, the generated example can satisfy the general single table operation, use MyBatis annotation, The @mbggenerated can be used to overwrite the generated code at the next build, without affecting the manually added query (the Eclipse plugin that needs to be used, IntelliJ does not currently have a similar plugin), in the use of IntelliJ, can use t

With Mbgenerator automatically generating MyBatis entities and Mapper (XML and interface) files, if you want to add new operations to the mapper, it is not convenient to change the automatically generated files, the workaround is to define a new interface and a new mapper XML file.Blogextmapper.javaPublic interface Blogextmapper extends Blogmapper {listThe select

mapper: What kind of request is given to Action.1} class:beannameurlhandlermapping to Master,The programmer-defined The name property of the tag corresponding to the Action is used as the request path .Springmvc.xmlController (programmer) - Beanname= "/hello.action"class= "Helloaction">Bean> Mapper (frame) - Beanclass= "Org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">Bean> 2}class:simpl

First, the development of normsYou need to write the Mapper.xml mapping file (this project is usermapper.xml, similar to the previous user.xml).Writing mapper interfaces requires following some development specifications, so that MyBatis can automatically generate mapper interfaces to implement proxy objects.1. Namespace equals Mapper interface address in Usermap

One. MyBatis Default support aliases Alias Types of mappings _byte Byte _long Long _short Short _int Int _integer Int _double Double _float Float _boolean Boolean String String Byte Byte Long Long Short Short Int Integer

MyBatis Generator IntroductionMyBatis Generator Chinese Document http://mbg.cndocs.tk/MyBatis Generator (MBG) is a MyBatis code generator MyBatis and IBATIS. He can generate code for each version of MyBatis, and Ibatis 2.2.0 later code. He can introspect the database's tables (or tables) and then generate the underlying objects that can be used to access (multiple) tables. This makes it unnecessary to create objects and configuration files when interacting with database tables. MBG solves some s

In the example used in the previous chapter http://www.cnblogs.com/EasonJim/p/7083165.html, the Decorators.xml file is converted via URL matching.The following method is converted through the Sitemesh.xml pagedecoratormapper mapper without matching the URL, just specify the template in the Meta header decorator.Here are the steps to proceed:1. Add the Pagedecoratormapper Mapper to the Sitemesh.xml and speci

The use and principle analysis of mapper mapping configuration in Sqlsessionfactory sessionfactory = null; String resource = "Mybatisconfig.xml"; try { sessionfactory = new Sqlsessionfactorybuilder (). Build (Resources . Getresourceasreader (Resource)); } catch (IOException e) { e.printstacktrace (); }So let's start with Sqlsessionfactorybuilder and look at the MyBatis loading proces

Integrate with Springboot with the MyBatis official starter There is no problem starting the project in the IDE, but the following exception occurs when you hit the Jar startup project: 15:51:43.909 [main] DEBUG O.s.b.d.loggingfailureanalysisreporter-application failed to start due to an exception org . Springframework.beans.factory.NoSuchBeanDefinitionException:No qualifying Bean found for dependency [ Org.zbt.service.jxc.dao.base.DataDicMapper]: Expected at least 1 bean which qualifies as Au

Mybatis uses mapper code to integrate with Spring (1)Introduction The two ORM frameworks named javasselink and Hibernate, which have been used in previous java projects, are now implemented using Mybatis. Of course they have their own advantages and disadvantages. Sometimes, two frameworks can be used together in a project. In a project, technical selection is very important. Mybatis is a persistent layer framework and is a top-level project under apa

1. Mapper ClassFirst of all, there are four methods for the Mapper class:(1) protected void Setup (context context)(2) Protected void map (keyin key,valuein value,context Context)(3) protected void Cleanup (context context)(4) public void run (context context)The Setup () method is typically used to load some initialization work, such as a global file \ A link to a database, and so on; the cleanup () method

1. First define an entity User type that receives the data, and a userquery type for the input parameter.1 Public classUser {2 Public intID;3 PublicString username;4 PublicDate birthday;5 PublicString sex;6 PublicString address;7 }8 Public classUserQuery {9 PrivateString Orderbyclause;Ten PrivateListOredcriteria; One Public voidAddusernamelike (String username) { AOredcriteria.add (NewCriteria ("username like", username)); - } - Public voidAddsexg

Define a Mapper interface Package mapper; Import Pojo. User; Public Interface Usermapper { public User getUser (intthrows Exception; Public void throws Exception;}Define a usermapper.xml point to it, note that namespace needs to point to its full path, the SQL statement ID is the same as the method name, and then the arguments and the results are all in the same way as the method arguments.The XM

Use of universal Mapper Import dependency dependency> groupId>com.github.abel533groupId> artifactid>mapperartifactid> version>2.3.4version> Dependency> Configure Plugins pluginInterceptor="Com.github.abel533.mapperhelper.MapperInterceptor" > primary key self-increment write method mysql, detailed description See document --> property name= "IDENTITY" value= "MYSQL" />

1: First Look at what our root partition size isDF -H文件系统 类型 容量 已用 可用 已用% 挂载点/dev/mapper/centos-rootxfs 18G 1.1G 17G 6% /devtmpfs devtmpfs 479M 0 479M 0%/devtmpfs tmpfs 489M 0 489M 0%/dev/shmtmpfs tmpfs 489M 6.7M 483M 2%/runtmpfs tmpfs 489M 0 489M 0%/sys/fs/cgroup/dev/sda1xfs 497M 125M 373M 25%/boottmpfs tmpfs 98M 0 98M 0%/run/user/02: Add a Physical disk to the virtual machine and restart the virtual machine. 3: View disk numberls /dev/sd*/dev/sda/de

First, scan the Mapper interface file:1, Recommended:In the Application.java startup file, add annotations:@MapperScan ("Com.xxx.mapper")2.@MapperBecause my mapper is a module, the portal is a module.Mapper under the Com.xxx.mapper.The GroupID of the portal is com.xxx so that it can be scanned @mapper directly.ButMybatis-generator generated

First of all, we all know that Springmvc has two mappers:Org.springframework.web.servlet.handler. beannameurlhandlermappingAndOrg.springframework.web.servlet.handler. simpleurlhandlermappingAnd the first "name URL mapper" is used by default.There are two types of mappers that can coexist .But when the project was built today, when the two mappers were enabled,beannameurlhandlermapping failed.Here is my XML configuration: BeanID= "Hello"name= "/hell