MyBatis-Spring整合 注入SqlSessionTemplate

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 userWHERE 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sqlsessionprivate 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

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