mybatis-generator automatically generates mybatis code and xml

1. Introduce and configure mybatis-generator in pxm.xml

Add the org.mybatis.generator sample code under plugins under the build node as follows:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dcrenl.test</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>test</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </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>
                <configuration>
                    <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <!--加入下面这个依赖-->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>${mysql.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

        </plugins>
    </build>

</project>

 

Second, create a new mybatis-generator configuration xml file under the resources folder, as follows:

<? 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 " > 
<!- Configuration generator- > 
< generatorConfiguration > 

    <!- classPathEntry: JDBC driver of the database, replace it with your own drive location optional- > 
<!-     <classPathEntry location = "C: \ Users \ dcrenl \ .m2 \ repository \ mysql \ mysql-connector-java \ 8.0.19 \ mysql-connector-java-8.0.19.jar" /> -> 

    <!- One database, one context, defaultModelType = "flat" large data field, regardless of table- > 
    <context id="MysqlTables"targetRuntime = "MyBatis3" defaultModelType = "flat" > 

        <!- Automatically identify database keywords, default false, if set to true, according to the keyword list defined in SqlReservedWords; generally keep the default values, encountered database keywords (Java Keywords), use columnOverride to override- > 
        < property name = "autoDelimitKeywords" value = "true" /> 

        <!- Encoding of the generated Java file- > 
        < property name = "javaFileEncoding" value = "utf-8 " /> 

        <!- beginningDelimiter and endingDelimiter: indicate the symbol used to mark the database object name in the database, such as ORACLE is double quotes, MYSQL defaults to` backquotes; -> 
        < property name = "beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <!-- 格式化java代码 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>

        <!-- 格式化XML代码 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
        <plugin type= "org.mybatis.generator.plugins.ToStringPlugin" /> 

        <-! comment -> 
        < commentGenerator > 
            < Property name = "suppressAllComments" value = "to true" /> <-! Are uncommented -> 
            < property name = "suppressDate" value = "false" />  <!- Whether to generate comment generation timestamp- > 
        </ commentGenerator > 

        <!- jdbc connection- > 
        < jdbcConnection driverClass = "com.mysql.cj. jdbc.Driver "
                        connectionURL= "jdbc: mysql: // localhost: 3306 / test? serverTimezone = UTC & amp; setUnicode = true & amp; characterEncoding = utf8" userId = "root" 
                        password = "root" > 
            <!- Prevent the generation of tables from other libraries- > 
            < property name = "nullCatalogMeansCurrent" value = "true" /> 
        </ jdbcConnection > 

        <!- type conversion- > 
        < javaTypeResolver > 
            <!- whether to use bigDecimal, false can automatically convert the following types (Long, Integer, Short , etc.) -> 
            < property name = "forceBigDecimals" value="false"/>
        </ JavaTypeResolver > 

        <-! Generating entity classes address -> 
        < javaModelGenerator targetPackage = "com.dcrenl.examinersystem.entity" targetProject = "the src / main / Java" > 
            <-! Whether to allow schema package as a suffix - -> 
            < property name = "enableSubPackages" value = "false" /> 
            <!- Remove the space before and after the value returned from the database- > 
            < property name = "trimStrings" value = "true" /> 
        </ javaModelGenerator > 

        < ! -Generate map.xml file storage address- > 
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 生成接口dao（mapper） -->
        <javaClientGenerator targetPackage="com.dcrenl.examinersystem.mapper" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="false"/>
            <property name= "nullCatalogMeansCurrent" value = "true" /> 
        </ javaClientGenerator > 

        <!- There can be multiple tables, each table in the database can write a table, tableName indicates the database table to match, or in the tableName property By using the% wildcard to match all database tables, only the matching table will automatically generate the file enableSelectByPrimaryKey The corresponding configuration indicates whether to generate the corresponding interface- > 
        < table tableName = "t_%" 
               enableCountByExample = "false" 
               enableUpdateByExample = "false " 
               enableDeleteByExample =" false " 
               enableSelectByExample =" false " 
               selectByExampleQueryId =" false "
               enableSelectByPrimaryKey="true"
               enableUpdateByPrimaryKey="true"
               enableDeleteByPrimaryKey="true"
        >
            <property name="useActualColumnNames" value="false"/>
        </table>

    </context>
</generatorConfiguration>

3. Click the "Maven" column on the right side of IDEA, find "mybatis-generator" in "Plugins", expand to find "mybatis-generator: generate", right click, "Run Maven Build" generates