acme mapper

Configuring log4j is relatively straightforward, such as logging of this mapper interface needs to be logged:Package Org.mybatis.example;public interface Blogmapper {@Select ("select * FROM blog WHERE id = #{id}") Blog Selectblog (int id);}As long as a file named log4j.properties is created in the app's classpath, the specific contents of the file are as follows:# Global Logging Configurationlog4j.rootlogger=error, stdout# MyBatis logging configuratio

Development specification:Mapper interface development method only need to program ape to write Mapper interface (equivalent to DAO interface),Dynamic proxy objects that are created by the MyBatis framework based on the interface definition.The method body of the proxy object is the same as the DAO interface implementation class method.Mapper interface development is subject to the following specifications:The namespace in the 1.mapper.xml file is the

Original address Although MyBatis is very convenient, but want to write all the mapper still very tiring, fortunately mybatis the official introduction of automation tools, can be based on the database and the definition of a good configuration directly generated DAO layer and all the following code, very convenient.First WOM We build a maven project, I don't write it in detail here.Mybatis-generator Use configuration Open the Pom.xml file and add 3

Summary after reading:O/R Mapping is the relational object ing.Databases are used to map classes and data tables.The advantage is that it can automatically generate an object to save, delete, and read SQL statements.Currently, ado.net objectspaces does not support Chinese queries. The version only supports SQL Server 2000 or later;Looking forward to ADO. net2.0 Original article:What is o/R mapper? Author: Huo www.aspcool.com time: 13:35:56 views:

Tags: turn off CTO replacement batch Scanner EXCE EFAULT not LSEI. Overview of SqlsessionIn MyBatis, you can use Sqlsessionfactory to create sqlsession. Once you have a session, you can use it to execute the mapping statement, commit or rollback the connection, and finally, when you no longer need it, you can close the session. After using mybatis-spring, you no longer need to use sqlsessionfactory directly, because your bean can be injected through a thread-safe sqlsession, automatically commit

1. The configuration of the front controller Dispatcherservlet is configured in Web. XML to be the same as the servlet configuration1) contextconfiglocation configuration Sprimgmvc loaded configuration file (Configuration Processor mapper, adapter, etc.) if Contextconfiglocation is not configured, the default load is/web-inf/ Servlet name-servlet.xml (springmvc-servlet.xml)2)The first type: *.action, accessed with. Action ends resolved by Dispatcherse

1. Configure the note Mapper and adapter. -- Bean class="Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" /> -- Bean class="Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" />However, in the actual development, the annotations of the adapter and mapper configuration is often used to note-driven: Using Mvc:annotation-driven in

Mrunit can take less time and can test mapper and reducer separatelySteps:1, the use of Mrunit test mapper and Reducer2, the implementation of the MapReduce code localization test3. Using Hadoop logs4. Track execution metrics by counterThe process of testing mapper1, instantiate the Mapdirver class, as the test mapper is parameterized2. Call the Withmapper method

First, note: version issuesspring3.2 Previous versions, the annotated mapper and adapter used the following two classes.Org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping. class Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter. classIn the new version of the source code, you can see the following comments:The following classes are used in the 3.2 included and later versions:Org.springframework.w

Prerequisites: already integrated MyBatisCode generation steps: Add dependencyDependency> groupId>Tk.mybatisgroupId> Artifactid>Mapper-spring-boot-starterArtifactid> version>1.1.4version>Dependency>Dependency> groupId>Org.mybatis.generatorgroupId> Artifactid>Mybatis-generator-coreArtifactid> version>1.3.6version>Dependency> Create a class with the main method, the code is as follows PackageCom.ghaien.generator;ImportOrg.mybatis