1创建项目，在启动类上添加映射扫描注解
2导入依赖，添加mybatis generator自动生成代码插件
<!-- mybatis generator 自动生成代码插件 -->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<configurationFile>${project.basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
<overwrite>true</overwrite>
<verbose>true</verbose>
</configuration>
</plugin>
3创建generatorConfig.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:选择你的本地硬盘上面的数据库驱动包-->
<classPathEntry location="D:\jar\mysql-connector-java-5.1.0-bin.jar"/>
<context id="default" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://url:3306/database" userId="username" password="passwrord">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.domain" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="com.mapper" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<!--<table tableName="invitationc" domainObjectName="Invitationc" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="leaving_a_message" domainObjectName="LeavingAMessage" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="order_payment" domainObjectName="OrderPayment" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="sign_up" domainObjectName="SignUp" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="photo_order" domainObjectName="PhotoOrder" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<table tableName="commission_order" domainObjectName="CommissionOrder" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<!--<table tableName="invitationc" domainObjectName="Invitationc" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="dynamic" domainObjectName="Dynamic" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="sys_dict" domainObjectName="SysDict" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="tag" domainObjectName="Tag" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="attention" domainObjectName="Attention" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="tab_collection" domainObjectName="TabCollection" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
<!--<table tableName="sign_in" domainObjectName="SignIn" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>-->
</context>
</generatorConfiguration>
根据generatorConfig.xml文件生成的
模型：
映射文件：
DAO文件：
4、自定义查询语句
mapper
dao:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.idailycar.mapper.TabCollectionMapper" >
<resultMap id="BaseResultMap" type="com.idailycar.domain.TabCollection" >
<id column="id" property="id" jdbcType="BIGINT" />
<result column="host_id" property="hostId" jdbcType="BIGINT" />
<result column="collector_id" property="collectorId" jdbcType="BIGINT" />
<result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
<result column="update_tine" property="updateTine" jdbcType="TIMESTAMP" />
<result column="state" property="state" jdbcType="BIGINT" />
</resultMap>
<sql id="Base_Column_List" >
id, host_id, collector_id, create_time, update_tine, state
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
select
<include refid="Base_Column_List" />
from tab_collection
where id = #{id,jdbcType=BIGINT}
</select>
<select id="findByCollectorIdAndHostId" resultType="com.idailycar.domain.TabCollection">
SELECT * from tab_collection where collector_id = #{collectorId} and host_id = #{hostId} and state = 16
</select>
<select id="findByCollectorIdAndHostIdAndUNCollection" resultType="com.idailycar.domain.TabCollection">
SELECT * from tab_collection where collector_id = #{collectorId} and host_id = #{hostId} and state = 17
</select>
<select id="findCollectionInfoByOpenId" resultType="com.idailycar.controller.response.DynamicInfo">
select d.id as dynamicId,u.id as userId,u.nickname as nickname,u.gender as gender,u.avatar_file as avatarFile,u.occupation as occupation,d.location as location,d.content as content,d.create_time as createTime from dynamic d INNER JOIN user u on d.creator_id = u.id where d.id in (select c.host_id from tab_collection c where c.collector_id = #{collectorId} and c.state = 16)
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
delete from tab_collection
where id = #{id,jdbcType=BIGINT}
</delete>
<insert id="insert" parameterType="com.idailycar.domain.TabCollection" >
insert into tab_collection (id, host_id, collector_id,
create_time, update_tine, state
)
values (#{id,jdbcType=BIGINT}, #{hostId,jdbcType=BIGINT}, #{collectorId,jdbcType=BIGINT},
#{createTime,jdbcType=TIMESTAMP}, #{updateTine,jdbcType=TIMESTAMP}, #{state,jdbcType=BIGINT}
)
</insert>
<insert id="insertSelective" parameterType="com.idailycar.domain.TabCollection" >
insert into tab_collection
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="hostId != null" >
host_id,
</if>
<if test="collectorId != null" >
collector_id,
</if>
<if test="createTime != null" >
create_time,
</if>
<if test="updateTine != null" >
update_tine,
</if>
<if test="state != null" >
state,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=BIGINT},
</if>
<if test="hostId != null" >
#{hostId,jdbcType=BIGINT},
</if>
<if test="collectorId != null" >
#{collectorId,jdbcType=BIGINT},
</if>
<if test="createTime != null" >
#{createTime,jdbcType=TIMESTAMP},
</if>
<if test="updateTine != null" >
#{updateTine,jdbcType=TIMESTAMP},
</if>
<if test="state != null" >
#{state,jdbcType=BIGINT},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.idailycar.domain.TabCollection" >
update tab_collection
<set >
<if test="hostId != null" >
host_id = #{hostId,jdbcType=BIGINT},
</if>
<if test="collectorId != null" >
collector_id = #{collectorId,jdbcType=BIGINT},
</if>
<if test="createTime != null" >
create_time = #{createTime,jdbcType=TIMESTAMP},
</if>
<if test="updateTine != null" >
update_tine = #{updateTine,jdbcType=TIMESTAMP},
</if>
<if test="state != null" >
state = #{state,jdbcType=BIGINT},
</if>
</set>
where id = #{id,jdbcType=BIGINT}
</update>
<update id="updateByPrimaryKey" parameterType="com.idailycar.domain.TabCollection" >
update tab_collection
set host_id = #{hostId,jdbcType=BIGINT},
collector_id = #{collectorId,jdbcType=BIGINT},
create_time = #{createTime,jdbcType=TIMESTAMP},
update_tine = #{updateTine,jdbcType=TIMESTAMP},
state = #{state,jdbcType=BIGINT}
where id = #{id,jdbcType=BIGINT}
</update>
</mapper>
方便在Dao接口和Mappper XML文件之间进行切换，下载free mybatis plugins插件，安装步骤：
