spring mybatis简析

好多天没有发博客了，下面就直接说下我正在学习的mybatis。

下面就说下mybatis在spring中最简单的配置：

<!-- 配置数据源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  
        <!-- 基本属性 url、user、password --> 
        <property name="url" value="${dataSource.url}" />  
        <property name="username" value="${dataSource.username}" />  
        <property name="password" value="${dataSource.password}" /> 
        <property name="driverClassName" value="${dataSource.driverClassName}" />
    </bean>
    
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="mapperLocations" value="classpath:com/spring/mapping/*.xml" /><!-- 实体映射文件  -->
		<property name="configLocation" value="/WEB-INF/configuration.xml" /><!-- 配置别名 -->
	</bean>

	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.spring.dao" /><!-- 扫描dao层文件  -->
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
	</bean> 
        <bean name="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                <property name="dataSource" ref="dataSource" />
        </bean>

对于这些配置，学过hibernate的一看就能明白了，基本就是配置数据源，以及实体映射，和事务的一些配置。

下面是实体的内容：

public class User{
	
	public int id;
	
	public String name;
	
    public String password;
    
    
    public Role role;
    
	
    public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
		
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public Role getRole() {
		return role;
	}
	public void setRole(Role role) {
		this.role = role;
	}	
}

public class Role{
	
	private int roleid;
	
	private String rolename;

	public int getRoleid() {
		return roleid;
	}

	public void setRoleid(int roleid) {
		this.roleid = roleid;
	}

	public String getRolename() {
		return rolename;
	}

	public void setRolename(String rolename) {
		this.rolename = rolename;
	}
	
}

user.xml

<?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.spring.dao.LoginDao">
	
	<resultMap id="BaseResultMap" type="User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="name" property="name" jdbcType="VARCHAR" />
        <result column="password" property="password" jdbcType="VARCHAR" />
        
        <association property="role" javaType="Role" >
            <id column="roleid" property="roleid" jdbcType="INTEGER" />
            <result column="rolename" property="rolename" jdbcType="VARCHAR" />
        </association>
    </resultMap>
	
	
	<select id="findByName" resultMap="BaseResultMap" parameterType="java.lang.String">
		select * from user as u,role as r where name = #{name} and u.roleid=r.roleid and u.roleid=1
	</select>
	
</mapper>

别名的配置：

<?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>
	<!-- 命名空间 -->
	<typeAliases>
		<typeAlias alias="User" type="com.spring.entity.User" />
		<typeAlias alias="Role" type="com.spring.entity.Role" />
	</typeAliases>
</configuration>

基本的配置就这些，有不明白的直接问，我会为尽力为大家解答，细节问题我没有细说。

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