小白文章之---在Spring Boot项目中加入Mybatis的逆向工程功能

注：本文档的代码在使用时请注意定义的路径

1、在pom.xml文件的properties节点下配置java接口和实体类生成的路劲和包

		<!-- 配置java接口和实体类生成的路劲和包 -->
		<!-- Java项目的路径 -->
        <targetJavaProject>${basedir}/src/main/java</targetJavaProject>
        <!-- 数据操作层生成的路径 -->
        <targetMapperPackage>com.t8.springbootssm.mapper</targetMapperPackage>
        <!-- 实体类生成的路径 -->
        <targetModelPackage>com.t8.springbootssm.entity</targetModelPackage>

2、在pom.xml文件的properties节点下配置xml文件生成的路径

        <!-- xml文件生成的路径 -->
        <targetResourcesProjectPackage>${basedir}/src/main/resources</targetResourcesProjectPackage>
        <targetXMLPackage>com.t8.springbootssm.mapper</targetXMLPackage>

3、在pom.xml文件的dependencies节点下导入ORM逆向工程需要的jar包

		<!-- ORM逆向工程需要的jar包 -->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
            <version>4.1.5</version>
        </dependency>

4、在plugins节点下配置自动生成插件，并导入需要的jar包

			<!-- mybatis自动生成插件配置 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <configuration>
                    <!-- generator配置文件 -->
                    <configurationFile>src/main/resources/generator-config.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <!--  -->
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <!-- 需要的jar包 -->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.18</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>4.1.5</version>
                    </dependency>
                </dependencies>
            </plugin>

5、配置generator-config.xml文件，主要是配置数数据库连接和对应生成的包

<?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>
    <!-- 数据库配置文件 -->
    <properties resource="datasource.properties" />
    <context id="Mysql"
             targetRuntime="tk.mybatis.mapper.generator.TkMyBatis3SimpleImpl"
             defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/>
        </plugin>
        <jdbcConnection driverClass="${db.driver}"
                        connectionURL="${db.url}"
                        userId="${db.username}"
                        password="${db.password}">
            <property name="nullCatalogMeansCurrent" value="true"/>
        </jdbcConnection>
        <!-- 实体类 -->
        <javaModelGenerator targetPackage="${targetModelPackage}" targetProject="${targetJavaProject}" />
        <!-- 映射xml文件 -->
        <sqlMapGenerator targetPackage="${targetXMLPackage}" targetProject="${targetResourcesProject}" />
        <!-- 映射接口 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="${targetMapperPackage}" targetProject="${targetJavaProject}" />
		<!-- catalog帮助生成实体类table注解，生成后需要注意table注解的语法是否正确 -->
        <table catalog="数据库名" tableName="%" mapperName="{0}Mapper">
            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

6、完成以上配置后，就可以在maven工具栏中，找到插件了，双击运行就可以生成实体类和数据操作层接口和接口对应的xml配置文件