Spring+MyBatis整合过程

步骤:

　　1.引入Spring+MyBatis开发包

　　　　>spring(ioc aop dao)开发包

　　　　>mybatis开发包,dbcp,驱动包

　　　　>mybatis-spring.jar整合包

　　2.引入Spring+MyBatis配置文件

　　　　>applicationContext.xml

　　　　>sqlmap-config.xml

　　3.写实体类

　　4.定义SQL和Mapper映射器接口

　　5.在Spring中追加MyBatis整合配置

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在applicationContext.xml

引入外部db.properties

 <context:property-placeholder location="classpath:db.properties" />

配置数据源

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
         <property name="driverClassName" value="${driverClassName}"></property>
         <property name="url" value="${url}"></property>
         <property name="username" value="${jdbc.username}"></property>
         <property name="password" value="${jdbc.password}"></property>
     </bean>

配置SqlSessionFactoryBean

 <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="configLocation" value="classpath:sqlmap-config.xml"></property>
         <property name="dataSource" ref="dataSource"></property>
     </bean>

配置MapperScannerConfigurer

 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <!-- 扫描com.xdl.mapper下的Mapper接口创建对象 -->
         <property name="basePackage" value="com.xdl.mapper"></property>
     </bean>

在sqlmap-config.xml指定SQL定义文件以及打印日志和分页

 <?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>
     <!-- 将底层日志打印 -->
     <settings>
         <setting name="logImpl" value="STDOUT_LOGGING" />
     </settings>
     <!-- 分页 -->
     <plugins>
         <plugin interceptor="com.github.pagehelper.PageHelper"></plugin>
     </plugins>
     <!-- 指定SQL定义文件 -->
     <mappers>
         <mapper class="com.xdl.mapper.DeptMapper" />
     </mappers>
 </configuration> 

写实体类

 package com.xdl.entity;

 import java.io.Serializable;

 public class Dept implements Serializable {
     /**
      *
      */
     private static final long serialVersionUID = 1L;
     private Integer deptno;// 类型和名称与表保持一致
     private String dname;
     private String loc;

     public Dept(String dname, String loc) {
         super();
         this.dname = dname;
         this.loc = loc;
     }

     public Dept() {
         super();
     }

     public Dept(Integer deptno, String dname, String loc) {
         super();
         this.deptno = deptno;
         this.dname = dname;
         this.loc = loc;
     }

     public Integer getDeptno() {
         return deptno;
     }

     public void setDeptno(Integer deptno) {
         this.deptno = deptno;
     }

     public String getDname() {
         return dname;
     }

     public void setDname(String dname) {
         this.dname = dname;
     }

     public String getLoc() {
         return loc;
     }

     public void setLoc(String loc) {
         this.loc = loc;
     }

 }

写DeptMapper接口,里面使用标注实现增删改查(单值DQL返回对象,多值查询返回集合,DML返回int或void)

 package com.xdl.mapper;

 import java.util.List;

 import org.apache.ibatis.annotations.Insert;
 import org.apache.ibatis.annotations.Param;
 import org.apache.ibatis.annotations.Select;
 import org.apache.ibatis.annotations.Update;

 import com.xdl.entity.Dept;

 public interface DeptMapper {
     // 查询所有
     @Select("select * from dept")
     List<Dept> findAll();

     // 根据id查询单值
     @Select("select * from dept where deptno = #{no}")
     Dept findById(int id);

     // 根据id修改名字
     @Update("update dept set dname = #{name} where deptno = #{no}")
     int updateById(@Param("no") int id, @Param("name") String name);

     // 根据id修改名字和地址
     @Update("update dept set dname = #{dname},loc = #{loc} where deptno = #{deptno}")
     int update(Dept dept);

     // 插入名字和地址,序列自增长
     @Insert("insert into dept (deptno,dname,loc) values (dept_seq.nextval,#{dname},#{loc})")
     int insert(Dept dept);
 }

最后使用junit测试

 package com.xdl.test;

 import java.util.List;

 import org.junit.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 import com.github.pagehelper.Page;
 import com.github.pagehelper.PageHelper;
 import com.xdl.entity.Dept;
 import com.xdl.mapper.DeptMapper;

 public class TestDept {
     ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");
     DeptMapper deptDao = ioc.getBean("deptMapper", DeptMapper.class);
     @Test
     public void testDept() {
         // 插入分页设置
         Page<Dept> page = PageHelper.startPage(2, 3);
         List<Dept> list = deptDao.findAll();
         System.out.println("dept: " + list);
         for (Dept dept : list) {
             System.out.println("\n" + dept.getDeptno() + ":" + dept.getDname() + ":" + dept.getLoc());
         }
         // getTotal 全部的
         System.out.println("\n总行数:" + page.getPageSize() + "\n" + "总页数:" + page.getPageNum());
     }

     @Test
     public void testDeptById() {
         Dept dept = deptDao.findById(10);
         String str = "'查到了' + " + dept + "  +'条记录'";
         System.out.println(str);
         System.out.println(dept.getDname() + ":" + dept.getLoc());
     }

     @Test
     public void testUpdateBy() {
         int row = deptDao.updateById(20, "wangcai");
         String str = "'修改了' + " + row + "  +'条记录'";
         System.out.println(str);
     }

     @Test
     public void testUpdate() {
         int row = deptDao.update(new Dept(20, "wanghua", "sx"));
         String str = "'插入了' + " + row + "  +'条记录'";
         System.out.println(str);
     }

     @Test
     public void testInsert() {
         int row = deptDao.insert(new Dept("wl", "g"));
         System.out.println(row);
     }
 }

注意:

在配置db.properties里的账号和密码

在测试的时候回出现用户名或密码错误,这个原因是因为默认使用本地计算机用户名,为了区分系统用户名,所以在username和password前面加上xxx.