Result Maps collection already contains value for xxxMapper.BaseResultMap错误解决办法
一、问题描述
今天在做项目时，遇到一个错误：“Result Maps collection already contains value for com.xxx.dao.tb_userMapper.BaseResultMap”
最简单的方法就是将逆向工程在eclipse中移除掉，然后重新import这个逆向工程，然后重新生成mapper文件。
因为如果之前生成过一张相同的表，逆向工程会再生成，导致内容重复，报该表的错误。
二、原因分析
Mybatis-Generator在生成Mapper.xml文件时，会在原来基础上再生成，导致内容重复。
三、解决办法
（1）改造Mybatis-generator插件
参考mybatis-generator重新生成代码时的SQL映射文件覆盖
（2）将手写xml文件与自动生成xml文件分离
手写文件放在src/main/resources/mybatis目录中
生成文件放在src/main/resources/mybatis-generator目录中，这样便于在生成之前手动删除。
generatorConfig.xml配置：
<?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="D:Javamaven
epositorymysqlmysql-connector-java5.1.31mysql-connector-java-5.1.31.jar" />
<context id="aisSnsTables" targetRuntime="MyBatis3">
<plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
<plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin" />
<plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
<!-- 抑制生成代码的注释 -->
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/liying" userId="root"
password="root@" />
<javaModelGenerator targetPackage="com.uni2uni.model"
targetProject="src/main/java" />
<sqlMapGenerator targetPackage="/"
targetProject="src/main/resources/mybatis-generator" />
<javaClientGenerator targetPackage="com.uni2uni.dao"
targetProject="src/main/java" type="XMLMAPPER">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<table schema="liying" tableName="tb_user" domainObjectName="tb_user" />
<table schema="liying" tableName="tb_admin" domainObjectName="tb_admin" />
<table schema="liying" tableName="tb_role" domainObjectName="tb_role" />
<table schema="liying" tableName="tb_resource" domainObjectName="tb_resource" />
<table schema="liying" tableName="tb_user_role" domainObjectName="tb_user_role" />
<table schema="liying" tableName="tb_role_resource" domainObjectName="tb_role_resource" />
<table schema="liying" tableName="tb_category" domainObjectName="tb_category"/>
<table schema="liying" tableName="tb_shop" domainObjectName="tb_shop"/>
</context>
</generatorConfiguration>
mybatis.xml配置：
<?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>
<typeAliases>
<typeAlias alias="user" type="com.uni2uni.model.tb_user" />
<typeAlias alias="admin" type="com.uni2uni.model.tb_admin" />
<typeAlias alias="role" type="com.uni2uni.model.tb_role" />
<typeAlias alias="resource" type="com.uni2uni.model.tb_resource" />
<typeAlias alias="category" type="com.uni2uni.model.tb_category" />
<typeAlias alias="shop" type="com.uni2uni.model.tb_shop" />
</typeAliases>
<plugins>
<plugin
interceptor="com.github.miemiedev.mybatis.paginator.OffsetLimitInterceptor">
<property name="dialectClass"
value="com.github.miemiedev.mybatis.paginator.dialect.MySQLDialect" />
</plugin>
</plugins>
<mappers>
<mapper resource="mybatis/tb_user.xml" />
<mapper resource="mybatis-generator/tb_userMapper.xml" />
<mapper resource="mybatis/tb_admin.xml" />
<mapper resource="mybatis-generator/tb_adminMapper.xml" />
<mapper resource="mybatis/tb_role.xml" />
<mapper resource="mybatis-generator/tb_roleMapper.xml" />
<mapper resource="mybatis/tb_resource.xml" />
<mapper resource="mybatis-generator/tb_resourceMapper.xml" />
<mapper resource="mybatis/tb_user_role.xml" />
<mapper resource="mybatis-generator/tb_user_roleMapper.xml" />
<mapper resource="mybatis/tb_role_resource.xml" />
<mapper resource="mybatis-generator/tb_role_resourceMapper.xml" />
<mapper resource="mybatis/tb_category.xml" />
<mapper resource="mybatis-generator/tb_categoryMapper.xml" />
<mapper resource="mybatis/tb_shop.xml" />
<mapper resource="mybatis-generator/tb_shopMapper.xml" />
</mappers>
</configuration>