mybatis: 简单增删改

Mapper映射文件:

注: 映射文件中的sql语句不用带分号

<?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.mybatis.mapper.VendorMapper">

  <!-- 查询
  resultType : 指定查询出来的类型
  databaseId : 配合databaseIdProvider动态选择数据库SQL语句

   -->
  <select id="getVendorById" resultType="com.mybatis.bean.Vendor" databaseId="mysql">
    select * from Vendors where vend_id = #{id}
  </select>

  <!-- 增加: 
    parameterType: 传入的参数类型(可以省略，mybatis会自动映射)
  -->
  <insert id="insertVendor">
    INSERT INTO Vendors VALUES(#{vendId},#{vendName},#{vendAddress},#{vendCity},#{vendState},#{vendZip},#{vendCountry})
  </insert>

  <!-- 修改: 
    parameterType: 传入的参数类型(可以省略，mybatis会自动映射)
  -->
  <update id="updateById">
    UPDATE Vendors SET vend_name = #{vendName} WHERE vend_id = #{vendId}
  </update>

  <!-- 删除:
  parameterType: 传入的参数类型(可以省略，mybatis会自动映射)
   -->
   <delete id="deleteById">
    DELETE FROM Vendors WHERE vend_id = #{vendId}
   </delete>

</mapper>

接口文件:

    /*
     * Mybatis中Insert、update、delete操作可以有返回值,返回值类型可以有以下几种:
     * Boolean(boolean) | Integer(int) | Long(long) | void
     * 前三种类型(包装类型或普通数据类型)
     * 如果是Integer 或 Long 类型，则返回的是影响行数，如果是boolean类型，mybatis会将数值类型转换成boolean类型返回(
     * 影响行数>0为true,影响行数=0为false)
     * */
    //查询
    public Vendor getVendorById(String vendId);
    //增加
    public Boolean insertVendor(Vendor vendor);
    //更新
    public Boolean updateById(Vendor vendor);
    //删除
    public Boolean deleteById(Vendor vendor);

实体类:

//属性
    private String vendId;
    private String vendName;
    private String vendAddress;
    private String vendCity;
    private String vendState;
    private String vendZip;
    private String vendCountry;

    //无参构造器
    public Vendor() {
        super();
    }

    //带参构造器
    public Vendor(String vendId, String vendName, String vendAddress, String vendCity, String vendState, String vendZip,
            String vendCountry) {
        super();
        this.vendId = vendId;
        this.vendName = vendName;
        this.vendAddress = vendAddress;
        this.vendCity = vendCity;
        this.vendState = vendState;
        this.vendZip = vendZip;
        this.vendCountry = vendCountry;
    }

    //getter、setter方法
    public String getVendId() {
        return vendId;
    }
    public void setVendId(String vendId) {
        this.vendId = vendId;
    }
    public String getVendName() {
        return vendName;
    }
    public void setVendName(String vendName) {
        this.vendName = vendName;
    }
    public String getVendAddress() {
        return vendAddress;
    }
    public void setVendAddress(String vendAddress) {
        this.vendAddress = vendAddress;
    }
    public String getVendCity() {
        return vendCity;
    }
    public void setVendCity(String vendCity) {
        this.vendCity = vendCity;
    }
    public String getVendState() {
        return vendState;
    }
    public void setVendState(String vendState) {
        this.vendState = vendState;
    }
    public String getVendZip() {
        return vendZip;
    }
    public void setVendZip(String vendZip) {
        this.vendZip = vendZip;
    }
    public String getVendCountry() {
        return vendCountry;
    }
    public void setVendCountry(String vendCountry) {
        this.vendCountry = vendCountry;
    }

    //覆盖toString方法
    @Override
    public String toString() {
        return "Vendor [vendId=" + vendId + ", vendName=" + vendName + ", vendAddress=" + vendAddress + ", vendCity="
                + vendCity + ", vendState=" + vendState + ", vendZip=" + vendZip + ", vendCountry=" + vendCountry + "]";
    }

测试文件:

InputStream inputStream = null;
        SqlSessionFactory sqlSessionFactory = null;
        SqlSession session = null;
        try {
            inputStream = Resources.getResourceAsStream("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            session = sqlSessionFactory.openSession();
            VendorMapper mapper = session.getMapper(VendorMapper.class);
            /*Vendor vendorById = mapper.getVendorById("BRE02"); */

            /*mapper.insertVendor(new Vendor("BER10", "PEOPLE", "CHINA", "GUANGZHOU", "20O", "ABC", "GUANGZ"));*/
            Vendor v = new Vendor();
            v.setVendId("BER10");

            /*v.setVendName("我类个擦");
            Boolean b = mapper.updateById(v);
            System.out.println(b);*/

            Boolean deleteById = mapper.deleteById(v);
            System.out.println(deleteById);

            session.commit();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                session.close();
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

如果通过mybatis的openSession()手动获取SqlSession的，则需要手动commit或rollback。如果是openSession(true)获取的SQLSession，则表示自动提交，无效手动commit。与spring整合后mybatis的 SQLSession创建交给了spring容器来管理，所以就无需手动commit了