SpringBoot 整合Mybatis

使用mybatis-generator自动生成映射文件

第一步 ：Pom.xml中数据库相关依赖包

<!--mybatis包-->
<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>2.0.0</version>
</dependency>

<!--mysql包-->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>

<!--Alibaba的druid数据库连接池-->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.13</version>
</dependency>

第二步：Pom.xml中 Mybatis-generator插件

<plugin>
	<groupId>org.mybatis.generator</groupId>
	<artifactId>mybatis-generator-maven-plugin</artifactId>
	<version>1.3.5</version>
	<dependencies>
		<dependency>
			<groupId>org.mybatis.generator</groupId>
			<artifactId>mybatis-generator-core</artifactId>
			<version>1.3.5</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>8.0.15</version>
		</dependency>
	</dependencies>
	<executions>
		<execution>
			<id>mybatis generator</id>
			<phase>package</phase>
			<goals>
				<goal>generate</goal>
			</goals>
		</execution>
	</executions>

	<configuration>
		<!--允许移动Mybatis生成的文件-->
		<verbose>true</verbose>
		<!--不允许自动覆盖Mybatis生成的文件-->
		<overwrite>false</overwrite>
		<!--mybatis自动生成配置文件路径-->
		<configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
	</configuration>
</plugin>

第三步：在Mysql中创建表

第四步：编写mybatis-generator.xml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>
    <!--数据库驱动-->
    <context id="MysqlTables" targetRuntime="MyBatis3">

        <!--数据库链接地址账号密码-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://172.16.65.200/mybatis?nullCatalogMeansCurrent=true" userId="root" password="123456">
        </jdbcConnection>

        <!--生成DataObject类存放位置，需要新建dataobject目录-->
        <javaModelGenerator targetPackage="com.vmware.mytabisdemo.dataobject" 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，需要新建mapping目录-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!--生成Dao类存放位置，需要新建dao目录-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.vmware.mytabisdemo.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <table tableName="user" domainObjectName="UserDO"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

第五步：使用Mybatis-generator生成表对应数据库的映射

说明：
DO(Data Object): UserDO.java —— 对应table_user表所有字段映射的实体类，只有属性setter和getter方法，建议仅仅用于操作DAO层执行sql时的传参。
DAO(Data Access Object): UserDOMapper.java —— 定义了对table_user表操作的接口，存放各种增删查改的api。
UserDOMapper.xml —— 定义了对table_user表操作的具体sql语句，存放各种增删改查的sql。

第六步：指定UserDOMapper的扫描路径，否则启动时会提示找不到DOMapper文件

@SpringBootApplication(scanBasePackages = "com.vmware.mytabisdemo")
@MapperScan("com.vmware.mytabisdemo.dao")
public class MytabisDemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(MytabisDemoApplication.class, args);
	}
}