Spring+Mybatis实战教程

1、ORM的基本思想

是将表与表之间的操作，映射成对象和对象之间的操作，就是通过操作实体类来达到操作表的目的。从而避免冗长的持久层代码，专注于业务逻辑

1. 从配置文件(通常是XML配置文件中)得到 sessionfactory.

2. 由sessionfactory  产生 session

3. 在session 中完成对数据的增删改查和事务提交等.

4. 在用完之后关闭session 。

5. 在java 对象和 数据库之间有做mapping 的配置文件，也通常是xml 文件。

和hibernate一样作为持久层的框架，mybatis是一个轻量级半ORM框架，开发者自行定义sql，因此更加灵活。

开发工具：STS,Sql Developer,Tomcat7,Maven

开发环境：SpringMVC,MyBatis,Oracle

项目结构：



这里使用国内一个叫tk.mybatis的工具，相较于原生态的mybatis，它帮助我们做了很多实用的事情，大多数情况下我们需要在原生态mybatis上加工的想法它基本上都已经有很好的实现。

第一步，添加Maven依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.wang</groupId>
<artifactId>ff</artifactId>
<name>spring-1</name>
<packaging>war</packaging>
<version>1.0.0-BUILD-SNAPSHOT</version>
<properties>

4000
<java-version>1.6</java-version>
<org.springframework-version>3.1.1.RELEASE</org.springframework-version>
<org.aspectj-version>1.6.10</org.aspectj-version>
<org.slf4j-version>1.6.6</org.slf4j-version>
</properties>
<dependencies>
<span style="color:#ff0000;"><!-- Spring依赖 --></span>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.1.RELEASE</version>
</dependency>

<!-- AspectJ -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${org.aspectj-version}</version>
</dependency>

<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j-version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j-version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j-version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
</exclusions>
<scope>runtime</scope>
</dependency>

<!-- @Inject -->
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>

<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

<!-- Test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>

<span style="color:#ff0000;"><!-- mybatis --></span>
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper</artifactId>
<version>3.3.7</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.3.0</version>
</dependency>

<!-- mybatis自动生成代码 -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.4.0</version>
</dependency>

<span style="color:#ff0000;"> <!-- dbcp连接池依赖 --> </span>
<!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- tomcat插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<uriEncoding>UTF-8</uriEncoding>
<path>/testShiro</path>
<port>8888</port>
</configuration>
</plugin>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<!-- 插件的初始配置 -->
<configuration>
<!-- 指定插件运行的generator.xml文件位置 -->
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
<!-- 允许移动生成的文件-->
<verbose>true</verbose>
<!-- 允许覆盖生成的文件-->
<overwrite>true</overwrite>
</configuration>
<dependencies>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.4.0</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<additionalProjectnatures>
<projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
</additionalProjectnatures>
<additionalBuildcommands>
<buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
</additionalBuildcommands>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArgument>-Xlint:all</compilerArgument>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>org.test.int1.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>

关于mybatis自动生成代码可以参考我的另一篇博文http://blog.csdn.net/biaozhun90/article/details/52223246

第二步，在root-context.xml里面注册mybatis配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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"> 
<!-- Root Context: defines shared resources visible to all other web components -->
<context:property-placeholder ignore-unresolvable="true" location="classpath:param.properties" />

<context:annotation-config />

<context:component-scan base-package="com.wang"/>

<!-- 数据源配置, 使用DBCP数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<!-- Connection Info -->
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />

<!-- Connection Pooling Info -->
<property name="maxActive" value="${dbcp.maxActive}" />
<property name="maxIdle" value="${dbcp.maxIdle}" />
<property name="defaultAutoCommit" value="false" />
<!-- 连接Idle一个小时后超时 -->
<property name="timeBetweenEvictionRunsMillis" value="3600000" />
<property name="minEvictableIdleTimeMillis" value="3600000" />
</bean>

<!-- sqlSessionFactory工厂注册 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 自动注册mybatis mapper bean -->
<!-- 注意,没有必要去指定SqlSessionFactory或SqlSessionTemplate,
因为MapperScannerConfigurer将会创建 MapperFactoryBean，之后自动装配。
但是，如果你使 用了一个以上的DataSource，那 么自动装配可能会失效。
这种情况下,你可以使用 sqlSessionFactoryBeanName或sqlSessionTemplateBeanName
属性来设置正确的 bean名称来使用。 -->
<bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.wang.ff.entity.*.persistence" />
<property name="properties">
<value>
mappers=tk.mybatis.mapper.common.Mapper
ORDER=BEFORE
</value>
</property>
</bean>
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd 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"> 
<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />

<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />

<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>

<context:component-scan base-package="com.wang.ff" />

</beans:beans>

第三步，测试:

实体类

package com.wang.ff.entity.sUser.domain;

import java.math.BigDecimal;

public class SUser {
private BigDecimal id;

private String userName;

private String password;

public BigDecimal getId() {
return id;
}

public void setId(BigDecimal id) {
this.id = id;
}

public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
}

mapper接口：

package com.wang.ff.entity.sUser.persistence;

import com.wang.ff.entity.sUser.domain.SUser;

import java.math.BigDecimal;

public interface SUserMapper {
int deleteByPrimaryKey(BigDecimal id);

int insert(SUser record);

int insertSelective(SUser record);

SUser selectByPrimaryKey(BigDecimal id);

int updateByPrimaryKeySelective(SUser record);

int updateByPrimaryKey(SUser record);

SUser
b6a8
getUserByName(String userName);
}

SUserMapper.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.wang.ff.entity.sUser.persistence.SUserMapper" >
<resultMap id="BaseResultMap" type="com.wang.ff.entity.sUser.domain.SUser" >
<id column="ID" property="id" jdbcType="DECIMAL" />
<result column="USER_NAME" property="userName" jdbcType="VARCHAR" />
<result column="PASSWORD" property="password" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
ID, USER_NAME, PASSWORD
</sql>

<select id="getUserByName" resultMap="BaseResultMap" parameterType="java.lang.String" >
select
<include refid="Base_Column_List" />
from S_USER
where user_name = #{userName,jdbcType=VARCHAR}
</select>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.math.BigDecimal" >
select
<include refid="Base_Column_List" />
from S_USER
where ID = #{id,jdbcType=DECIMAL}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.math.BigDecimal" >
delete from S_USER
where ID = #{id,jdbcType=DECIMAL}
</delete>
<insert id="insert" parameterType="com.wang.ff.entity.sUser.domain.SUser" >
insert into S_USER (ID, USER_NAME, PASSWORD
)
values (#{id,jdbcType=DECIMAL}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}
)
</insert>
<insert id="insertSelective" parameterType="com.wang.ff.entity.sUser.domain.SUser" >
insert into S_USER
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
ID,
</if>
<if test="userName != null" >
USER_NAME,
</if>
<if test="password != null" >
PASSWORD,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=DECIMAL},
</if>
<if test="userName != null" >
#{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.wang.ff.entity.sUser.domain.SUser" >
update S_USER
<set >
<if test="userName != null" >
USER_NAME = #{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
PASSWORD = #{password,jdbcType=VARCHAR},
</if>
</set>
where ID = #{id,jdbcType=DECIMAL}
</update>
<update id="updateByPrimaryKey" parameterType="com.wang.ff.entity.sUser.domain.SUser" >
update S_USER
set USER_NAME = #{userName,jdbcType=VARCHAR},
PASSWORD = #{password,jdbcType=VARCHAR}
where ID = #{id,jdbcType=DECIMAL}
</update>
</mapper>

com.wang.ff.entity.sUser.service.UserService类:

package com.wang.ff.entity.sUser.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.wang.ff.entity.sUser.domain.SUser;
import com.wang.ff.entity.sUser.persistence.SUserMapper;

@Service
public class UserService {

@Autowired
private SUserMapper userMapper;

public SUser getUserByName(String userName){
return userMapper.getUserByName(userName);
}
}

com.wang.ff.controller.UserController:

package com.wang.ff.controller;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.wang.ff.entity.sUser.domain.SUser;
import com.wang.ff.entity.sUser.service.UserService;

@Controller
@RequestMapping(value="/user")
public class UserController {

@Resource
private UserService userService;

@RequestMapping(value="/getUser")
public ModelAndView getUser(String userName){
ModelAndView mv = new ModelAndView("user");
SUser user = this.userService.getUserByName(userName);
mv.addObject("user",user);
return mv;
}
}

WEB-INF/views/user.jsp:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>Home</title>
</head>
<body>
<h1>
Hello world!
</h1>

<p>name:${user.userName };password:${user.password }</p>
</body>
</html>

启动项目后访问成功获取数据