MyBatis-Spring整合注入SqlSessionTemplate

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SqlSessionTemplate

SqlSessionTemplate 是 MyBatis-Spring 的核心。这个类负责管理 MyBatis 的 SqlSession, 调用 MyBatis 的 SQL 方法, 翻译异常。 SqlSessionTemplate 是线程安全的。

最终要的是让spring获取到SqlSessionTemplate然后注入给工具类，让工具类操作数据库

为了方便看，把所有文件都放一个文件夹里了。

总共是5个文件：

1.Mybatis.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN"  
	"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<mappers>
		<mapper resource="bs/UserMapper.xml" />
			<!-- 连接配置文件 -->
	</mappers>
</configuration>

2.
UserMapper.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="UserMapper">
	 <select id="insert" parameterType="Map" resultType="java.util.Map">
		INSERT INTO user
		(id) 
		VALUES
		(#{id})
	</select>
	
	<select id="findById" parameterType="int" resultType="java.util.Map">
		SELECT *
		FROM user
		WHERE id=#{id}
	</select>
	
<!-- 	<select id="findList" resultType="mybatis.User" parameterType="int">
		SELECT * FROM user 
		<if test="_parameter!=null and _parameter!=' '">
				WHERE uid=#{_parameter}
		</if>
	</select> -->
</mapper>

3.
spring.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:aop="http://www.springframework.org/schema/aop"	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-3.0.xsd      http://www.springframework.org/schema/aop       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd      http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-3.0.xsd      http://www.springframework.org/schema/tx       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">	<bean id="dataSource"		class="org.springframework.jdbc.datasource.DriverManagerDataSource">		<property name="driverClassName">			<value>org.gjt.mm.mysql.Driver</value>		</property>		<property name="url">			<value>jdbc:mysql://localhost:3306/zdy?useUnicode=true&characterEncoding=UTF-8			</value>		</property>		<property name="username">			<value>root</value>		</property>		<property name="password">			<value>1111</value>		</property>	</bean>			<!-- 获取会话工厂，并注入Mybatis，和dateSource数据库链接 -->	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">		<property name="dataSource" ref="dataSource"></property>		<property name="configLocation" value="bs/Mybatis.xml"></property>	</bean>			<!-- 在会话工厂中取出SqlSessionTemplate这个对象 -->     <bean id="sqlsessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">		<constructor-arg index="0" ref="sqlSessionFactory" />	</bean>				<!-- 把sqlsessionTemplate注入到UserMapper中去。UserMapper才能对数据进行操作 -->	<bean id="user" class="bs.UserImpl">	<property name="sqlsession" ref="sqlsessionTemplate">	</property>	</bean></beans>

4.
UserImpl.java :操作数据库工具类

package bs;

import java.util.List;
import java.util.Map;

import org.mybatis.spring.SqlSessionTemplate;

public class UserImpl {
	//注入以后就可以直接使用sqlsession
	private SqlSessionTemplate sqlsession;
	public void setSqlsession(SqlSessionTemplate sqlsession) {
		this.sqlsession = sqlsession;
	}
	//用sqlsession去操作数据库
	public void insert(Map user){
		sqlsession.insert("UserMapper.insert", user);
	}
	public void findById(int id){
		 sqlsession.selectOne("UserMapper.findById", id);
		 System.out.println(sqlsession.selectOne("UserMapper.findById", id));
		 //因为输出值是一个map集合，所以打印一个map
	}
}

5.
Test.java

package bs;

import java.util.Map;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
	public static void main(String[] args) {

		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("bs/spring.xml");
		UserImpl userImpl = (UserImpl)ctx.getBean("user");
		//固定格式  取出bean中创建的UserMapper对象		
		userImpl.findById(1);
	}
}

数据库内容