一、简介:mybatis是支持属性使用驼峰的命名
如下java代码
java
public class Role {
private Integer id;
private String roleName;
private String roleKey;
private Integer orderNum;
private Integer roleType;
private String remark;
...省略set,get方法
}
列名是有下划线的
像上面这样设计是需要配置下划线与驼峰式命名规则的映射
mapUnderscoreToCamelCase:是否启用下划线与驼峰式命名规则的映射(如first_name => firstName)
XML
<setting name="mapUnderscoreToCamelCase" value="true"/>
二、在SSM整合中的配置
方式一:
在applicationContext-dao.xml中引入mybatis配置
XML
<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 加载Mybatis全局配置文件 -->
<property name="configLocation" value="/WEB-INF/classes/mybatis/SqlMapConfig.xml"/>
</bean>
SqlMapConfig.xml
XML
<?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>
<!--配置全局属性-->
<settings>
<!--开启驼峰命名转换-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>
方式二:
在applicationContext-dao.xml中直接配置
XML
<bean class="org.mybatis.spring.SqlSessionFactoryBean" id="factory">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.glc.domain"/>
<property name="configuration">
<bean class="org.apache.ibatis.session.Configuration">
<property name="mapUnderscoreToCamelCase" value="true"/>
</bean>
</property>
</bean>
三、亲测代码配置文件spring-mybatis.xml
XML
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 扫描service包下所有使用注解的类型 -->
<context:component-scan base-package="com.chatRobot.service"/>
<!-- 配置数据库相关参数properties的属性:${url} -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
<property name="minPoolSize" value="${c3p0.minPoolSize}"/>
<property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}"/>
<property name="checkoutTimeout" value="${c3p0.checkoutTimeout}"/>
<property name="acquireRetryAttempts" value="${c3p0.acquireRetryAttempts}"/>
</bean>
<!-- 配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 扫描model包 使用别名 -->
<property name="typeAliasesPackage" value="com.chatRobot.model"/>
<!-- 扫描sql配置文件:mapper需要的xml文件 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
<property name="configuration">
<bean class="org.apache.ibatis.session.Configuration">
<!--mybatis支持属性使用驼峰的命名-->
<property name="mapUnderscoreToCamelCase" value="true"/>
</bean>
</property>
</bean>
<!-- 配置扫描Dao接口包,动态实现Dao接口,注入到spring容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.chatRobot.dao"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 配置基于注解的声明式事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>