Using automatic code generation Mybatis-Generator

         Prerequisite: you have SpringBoot engineering, and in the implementation of the above application of MyBatis, but the whole is to create mapper, xml mapping file, pojo etc. manually.

1. Add MyBatis.generator dependence in the POM

   <dependencies>
          <dependency>
               <groupId>org.mybatis.generator</groupId>
               <artifactId>mybatis-generator-core</artifactId>
               <version>1.3.2</version>
           </dependency>
   <dependencies>

   <build>
           <plugins>
               <plugin>
                   <groupId>org.springframework.boot</groupId>
                   <artifactId>spring-boot-maven-plugin</artifactId>
               </plugin>
               
               <plugin>
                   <groupId>org.mybatis.generator</groupId>
                   <artifactId>mybatis-generator-maven-plugin</artifactId>
                   <version>1.3.2</version>
                   
                   <executions>
                       <execution>
                           <id>mybatis-generator</id>
                           <phase>deploy</phase>
                           <goals>
                               <goal>generate</goal>
                           </goals>
                       </execution>
                   </executions>
   
                   <configuration>
                       <!-- Mybatis-Generator 工具配置文件的位置 -->
                       <configurationFile>${basedir}/src/main/resources/mybatis-generator/generatorConfig.xml</configurationFile>
                       <verbose>true</verbose>
                       <overwrite>true</overwrite>
                   </configuration>
               </plugin>
               
           </plugins>
       </build>

    

2. Creating src / main / resources to create mybatis-generator folder, create a configuration file in the folder generatorConfig.xml

   <? Xml Version = "1.0" encoding = "UTF-8" ?> 
   <! DOCTYPE generatorConfiguration 
           the PUBLIC "- // mybatis.org//DTD the Configuration MyBatis Generator 1.0 // EN" 
           "http://mybatis.org/dtd /mybatis-generator-config_1_0.dtd " > 
   ! <- Profile generator -> 
   < generatorConfiguration > 
       <-! command generator plug-in generates a file: Call mvn the mybatis-generator: the generate -e -> 
       <-! - the introduction of the configuration file -> 
       < the Properties Resource = "the Application-dev.yml" /> 
       <-! classpathentry: JDBC database driver, into your own driving position optional ->
       <! -<classpathentry LOCATION = "$ {the classPath}" /> -> 
   
       <-! a database context -> 
       <-! defaultModelType = "Flat" large data field, regardless of the table -> 
       < context ID = " MysqlTables " targetRuntime =" MyBatis3Simple " defaultModelType =" Flat " > 
           <-! automatic identification database key, default false, if set to true, according to the keyword list SqlReservedWords defined; 
           generally leave the default value, the keyword database encountered (Java keyword), covering the use of columnOverride -> 
           < Property name = "autoDelimitKeywords" value = "to true"  /> 
           
           <-! generate Java code files ->
           <property name= "javaFileEncoding" value = "UTF-. 8"  /> 
           
           <-! beginningDelimiter and endingDelimiter: symbols used to mark the database object name specified in the database, such that double quotes ORACLE, MYSQL Based default is `backquote; -> 
           < Property name = "beginningDelimiter" value = "` "  /> 
           < Property name =" endingDelimiter " value =" `"  /> 
   
           <-! format java code -> 
           < Property name = "javaFormatter" value = "ORG. mybatis.generator.api.dom.DefaultJavaFormatter " /> 
           
           <-! format XML code ->
           <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
           <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
   
           <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
   
           <!-- 注释 -->
           <commentGenerator >
               <property name="suppressAllComments" value="false"/><!-- 是否取消注释 -->
               <property name="suppressDate" value="true" /> <!--Note Generation whether to generate timestamp -> 
           </ commentGenerator > 
   
           <! - JDBC connection -> 
           <! - used as a configuration using the following * .properties link string -> 
           <! - <JdbcConnection driverClass = "$ spring.datasource.driver-class-name {} " 
                                         the connectionURL =" $ {} spring.datasource.url " 
                                         the userId =" $ {} spring.datasource.username " 
                                         password =" $ {spring.datasource.password} "/> ->  
                                         
           <! - used as a configuration using the following * .yml link string -> 
           < JdbcConnection driverClass = "$ {Driver}-class-name" 
                                   connectionURL= "URL $ {}"  
                                   the userId = "$ {} username" password = "{$ password}"  /> 
                                   
           <-! cast -> 
           < javaTypeResolver > 
               <-! whether bigDecimal, false or less can be automatically converted type (Long, Integer, Short, etc.) -> 
               < Property name = "forceBigDecimals" value = "to false" /> 
           </ javaTypeResolver > 
   
           <-! generating entity classes address -> 
           < javaModelGenerator targetPackage = "$ { } aliases-Package-type " targetProject ="${project}" >
               <property name="enableSubPackages" value="false"/>
               <property name="trimStrings" value="true"/>
           </javaModelGenerator>
          
           <!-- 生成mapxml文件 -->
           <sqlMapGenerator targetPackage="mapping" targetProject="${resources}" >
               <property name="enableSubPackages" value="false" />
           </sqlMapGenerator>
           
           <!- javaClientGenerator<->generating a corresponding mapxml client, i.e. the interface DAO
           targetPackage = "com.cs.mapper" targetProject = "$ {} Project" type = "XMLMAPPER"  > 
               < Property name = "enableSubPackages" value = "to false"  /> 
           </ javaClientGenerator > 
           
           <-! Table may have a plurality of each table in the database can write a table, tableName pledged to match the database table can also be used to match the tableName property by using wildcards% of all database tables, only the matching table will automatically generate a file -> 
           < Table tableName = "Employee" enableCountByExample = "to true" enableUpdateByExample = "to true" enableDeleteByExample = "to true" enableSelectByExample="true" selectByExampleQueryId="true">
               <property name="useActualColumnNames" value="false" />
               <!-- 数据库表主键 -->
               <generatedKey column="id" sqlStatement="Mysql" identity="true" />
           </table>
       </context>
   </generatorConfiguration>

   Note: The path where the $ Application Note, specify the path targetProject to start the project name, for example: MyProject / src / main / java

3. Create generating formulation package, DAO interface generation at src / main / java / main package / mapper bag, map the xml generated under src / main / resources / mapping, the generated entity classes in src / main / java / main package / under pojo
4. In generatorConfig.xml right click, Run As -> Run MyBatis Generator, generating template code
5. Create a controller class and services in their own class, you can achieve

        Note: One path generatorConfig.xml need to call attention to match the application configuration file