SpringBoot集成Mybatis3

前题条件：spring boot版本是 2.0.5.RELEASE，Mybatis Starter版本是 2.0.1

1,  引入mybatis starter依懒 

<dependency>
   <groupId>org.mybatis.spring.boot</groupId>
   <artifactId>mybatis-spring-boot-starter</artifactId>
   <version>2.0.1</version>
</dependency>

2,  在application.yml文件中增加如下配置

# mybatis配置
mybatis:
  config-location: classpath:/com/xxx/xxx/core/mybatis/mybatis-config.xml
  mapper-locations: classpath:/com/xxx/xxx/core/mapper/member/*.xml
  # 定义模块中使用到的类型别名
  type-aliases-package: com.xxx.xxx.core.entity.member

# 打印sql语句
logging:
  level:
      com:
        xxx:
          xxx:
            core:
              dao: debug

3,  在对应的路径上创建mybatis-config.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

4,  在对应的路径上创建generatorConfig.xml****配置文件生成对应的实体类、Mapper接口类、映射文件，注意把xxx路径换成自己项目中的路径。

<?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>
    <!--<classPathEntry
            location="C:/Oracle/Middleware/wlserver_10.3/server/lib/ojdbc6.jar"/>-->

    <context id="mySqlTables" targetRuntime="MyBatis3">

        <!-- 生成的Java文件的编码 -->
        <property name="javaFileEncoding" value="UTF-8"/>

        <!-- 生成的pojo，将implements Serializable-->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>

        <commentGenerator>
            <property name="suppressDate" value="false"/>
            <!--禁止生成注释-->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--数据库连接属性配置-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/xxx?useUnicode=true&amp;characterEncoding=UTF-8&amp;zeroDateTimeBehavior=convertToNull" userId="root"
                        password=""/>

        <javaTypeResolver>
            <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
            NUMERIC 类型解析为java.math.BigDecimal -->
            <property name="forceBigDecimals" value="false"/>
            <!-- This property is used to specify whether MyBatis Generator should force the use of JSR-310 data types for DATE, TIME,
            and TIMESTAMP fields, rather than using java.util.Date -->
            <property name="useJSR310Types" value="true"/>
        </javaTypeResolver>

        <!--生成的实体类相关配置-->
        <javaModelGenerator targetPackage="com.xxx.xxx.core.entity.member"
                            targetProject="E:\appdata\git\xxx\core\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="false"/>
            <!--设置父类-->
            <property name="rootClass" value="com.xxx.xxx.core.entity.BaseEntity" />
        </javaModelGenerator>

        <!--生成映射文件-->
        <sqlMapGenerator targetPackage="com.xxx.xxx.core.mapper.member"
                         targetProject="E:\appdata\git\xxx\core\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!--生成DAO文件-->
        <javaClientGenerator targetPackage="com.xxx.xxx.core.dao.member"
                             targetProject="E:\appdata\git\xxx\core\src\main\java" type="XMLMAPPER">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--可以配置多个表-->
        <table tableName="member_wechat_user" domainObjectName="WechatUser"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
            <!--<domainObjectRenamingRule searchString="^member_" replaceString="" />-->
            <!--<columnRenamingRule searchString="^member" replaceString=""/>-->
            <!--<property name="useActualColumnNames" value="false"/>-->
        </table>

    </context>
</generatorConfiguration>

5,  增加maven插件，运行generate命令。

<plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <configuration>
                    <configurationFile>src/main/resources/com/xxx/xxx/core/mybatis-generator/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>deploy</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>

                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <scope>runtime</scope>
                        <version>5.1.47</version>
                    </dependency>

                    <!--引入父类所在的项目-->
                    <dependency>
                        <groupId>com.xxx</groupId>
                        <artifactId>core</artifactId>
                        <version>1.0-SNAPSHOT</version>
                    </dependency>

                </dependencies>
            </plugin>

6,  在springboot起动类增加Mapper接口扫描注解

@MapperScan("com.xxx.xxx.core.dao.member")

PS: 映射文件中的 namespace 属性必须是Mapper接口的全路径名，因为这个是通过动态代理实现的。