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("
" + dept.getDeptno() + ":" + dept.getDname() + ":" + dept.getLoc());
        }
        // getTotal 全部的
        System.out.println("
总行数:" + page.getPageSize() + "
" + "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.