MyBatis與Spring整合的兩種方式
阿新 • • 發佈：2019-01-09
1、第一步：匯入jar包
spring的jar包、Mybatis的jar包、Spring+mybatis的整合包、Mysql的資料庫驅動jar包、資料庫連線池的jar包
2、加入配置檔案：
Spring的配置檔案——applicationContext.xml
這裡有一點需要注意：在配置sqlSessionFactory工廠時，在注入資料庫連線池的時候property的屬性名是dataSource，不要亂寫(很容易寫成dataSourse)，否則會報如下錯誤：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactoryBean' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSourse'ofbean class [org.mybatis.spring.SqlSessionFactoryBean]: Bean property 'dataSourse' is not writable or has an invalid setter method. Did you mean'dataSource'?
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 載入資料庫配置檔案 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 資料庫連線池 --> <bean id="dataSourse" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="maxActive" value="10"/> <property name="maxIdle" value="5"/> </bean> <!-- 配置SQLSessionFactory --> <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 配置mybatis核心配置檔案 --> <property name="configLocation" value="sqlMapConfig.xml"/> <!-- 注入連線池 --> <property name="dataSource" ref="dataSourse"/> </bean> <!-- 配置Dao 原始dao開發--> <bean id="UserDao" class="com.qianjin.dao.UserDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/> </bean> <!-- Mapper動態代理 --> <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <!-- 注入工廠 --> <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/> <!-- 注入介面 --> <property name="mapperInterface" value="sqlmapper.UserMapper"/> </bean> </beans>
MyBatis的配置檔案——sqlMapConfig.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> <!-- 設定別名 --> <typeAliases> <!-- 2. 指定掃描包，會把包內所有的類都設定別名，別名的名稱就是類名，大小寫不敏感 --> <package name="com.qianjin.pojo"/> </typeAliases> <mappers> <package name="sqlmapper"/> </mappers> </configuration>
連結資料庫的配置資訊檔案——db.property
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456
3、Dao開發：有兩種形式。一種是傳統的DAO開發，另一種是Mapper動態代理開發
（1）傳統Dao開發
pojo類:
package com.qianjin.pojo;
import java.util.Date;
public class User{
private Integer id;
private String username;// 使用者姓名
private String sex;// 性別
private Date birthday;// 生日
private String address;// 地址
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", sex=" + sex + ", birthday=" + birthday + ", address="
+ address + "]";
}
}
package com.qianjin.dao;
import com.qianjin.pojo.User;
public interface UserDao {
User queryUserById(Integer id);
}
package com.qianjin.dao;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import com.qianjin.pojo.User;
public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{
@Override
public User queryUserById(Integer id) {
User user = this.getSqlSession().selectOne("queryUserById", 10);
return user;
}
}
測試執行：
package com.qianjin.dao.test;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.qianjin.dao.UserDao;
import com.qianjin.pojo.User;
public class UserDaoTest {
ApplicationContext context;
@Before
public void init(){
this.context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
}
@Test
public void testQueryUserById(){
UserDao userDao=this.context.getBean(UserDao.class);
User user = userDao.queryUserById(10);
System.out.println(user);
}
}
（2）Mapper動態代理開發（UserMapper介面和UserMapper.xml配置檔案要在同一個包下）
配置UserMapper介面：
package sqlmapper;
import com.qianjin.pojo.User;
public interface UserMapper {
User queryUserById(Integer id);
}
配置UserMapper.xml配置檔案：
<?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="sqlmapper.UserMapper">
<!-- 根據使用者id查詢 -->
<select id="queryUserById" parameterType="Integer" resultType="user">
select * from user where id = #{id}
</select>
</mapper>
在Spring的配置檔案applicationContext.xml中配置UserMapper的配置資訊（上面的程式碼中已經配置，此處再貼一遍）
<!-- Mapper動態代理 -->
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<!-- 注入工廠 -->
<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
<!-- 注入介面 -->
<property name="mapperInterface" value="sqlmapper.UserMapper"/>
</bean>寫測試類進行測試：
package com.qianjin;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.qianjin.pojo.User;
import sqlmapper.UserMapper;
public class JunitTest {
private ApplicationContext context;
@Before
public void init() {
//通過類路徑配置spring配置檔案的位置資訊
this.context=new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
}
@Test
public void testQueryUserById() {
//根據spring配置檔案獲取bean
UserMapper userMapper = (UserMapper) this.context.getBean("userMapper");
User user = userMapper.queryUserById(10);
System.out.println(user);
}
}