使用IDEA實現Spring Boot項目的MyBatis代碼生成器

MyBatis代碼生成器確實很方便，可以使開發者更專注於業務。但是每個人都有自己的要求和方式，這就造成初學者很糾結很迷茫：在一篇文章抄了一點不行，又去另外的文章再抄又不行，慢慢地失去了耐心和信心。這樣的初學者，比比皆是，比如我。

終於讓我找到一個教程，即慕課網的SpringBoot構建電商基礎秒殺項目，於是很快就實現了。故作此文。

目錄

一、引進相關依賴

二、新建數據庫與數據庫表

三、mybatis生成器的配置文件

四、指定mybatis配置文件的路徑

五、新建生成代碼的文件夾

六、配置maven插件即mybatis生成器

七、測試

八、總結遇到過的問題及解決

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---

一、引進相關依賴

<?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 http://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>2.1.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<groupId>com.louis</groupId>
	<artifactId>mango</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>mango</name>
	<description>Demo project for Spring Boot</description>

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

	<repositories>
		<repository>
			<id>aliyun</id>
			<name>aliyun</name>
			<url>https://maven.aliyun.com/repository/public</url>
		</repository>

		<repository>
			<id>snapshots</id>
			<url>https://oss.sonatype.org/content/repositories/snapshots/</url>
		</repository>
	</repositories>


	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!-- swagger -->
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.9.2</version>
		</dependency>

		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.9.2</version>
		</dependency>

		<dependency>
			<groupId>org.apache.velocity</groupId>
			<artifactId>velocity-engine-core</artifactId>
			<version>2.1</version>
		</dependency>

		<dependency>
			<groupId>org.freemarker</groupId>
			<artifactId>freemarker</artifactId>
			<version>2.3.29</version>
		</dependency>

		<dependency>
			<groupId>com.ibeetl</groupId>
			<artifactId>beetl</artifactId>
			<version>3.0.13.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

		<!-- mysql -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>8.0.17</version>
		</dependency>

		<!-- druid -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.3</version>
		</dependency>

		<!--mybatis-->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.1</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<artifactId>maven-deploy-plugin</artifactId>
				<version>2.8.2</version>
			</plugin>
			<plugin>
				<groupId>org.mybatis.generator</groupId>
				<artifactId>mybatis-generator-maven-plugin</artifactId>
				<version>1.3.5</version>
				<dependencies>
					<dependency>
						<groupId>mysql</groupId>
						<artifactId>mysql-connector-java</artifactId>
						<version>8.0.17</version>
					</dependency>
				</dependencies>
				<executions>
					<execution>
						<id>mybatis generator</id>
						<phase>package</phase>
						<goals>
							<goal>generate</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<!--允許移動生成文件 -->
					<verbose>true</verbose>
					<!--允許自動覆蓋文件 -->
					<overwrite>true</overwrite>
					<configurationFile>
						src/main/resources/mybatis-generator.xml
					</configurationFile>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

• druid可以不加
• 版本問題，除了MySQL的版本去實際數據庫查之外，其他的照抄即可

二、新建數據庫與數據庫表

三、mybatis生成器的配置文件

<?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>
    <context id="DB2Tables" targetRuntime="MyBatis3">
         <!--去掉註釋-->
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!--數據庫鏈接地址賬號密碼-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/springboot?serverTimezone=UTC" userId="root" password="2345678">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--生成Model類存放位置-->
        <javaModelGenerator targetPackage="com.louis.mango.domain" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.louis.mango.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--生成對應表及類名-->
        <table tableName="theme" domainObjectName="Theme" enableSelectByPrimaryKey="true"
               enableUpdateByPrimaryKey="true"
               enableDeleteByPrimaryKey="true">
            <!--添加屬性useActualColumnNames爲true,那麼生成的對象字段就跟表一樣-->
            <property name="useActualColumnNames" value="true"/>
        </table>
    </context>
</generatorConfiguration>

•  以實際代碼爲準，因爲截圖中沒有“去掉註釋”和“生成對應表及類”的刪改查接口。

四、指定mybatis配置文件的路徑

mybatis:
  mapper-locations=classpath:mapper/*.xml

五、新建生成代碼的文件夾

六、配置maven插件即mybatis生成器

七、測試

 以下是生成文件的截圖：

八、總結遇到過的問題及解決

• Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.5:generate (default-cli) on project mango: Unknown system variable 'query_cache_size'

• Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.5:generate (default-cli) on project mango: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support

多謝閱讀，歡迎提問。