mybatis使用实例

 

mybatis使用说明

1.配置文件
2.PO 映射对象
3.Dao
4.对象关联：使用外连接查询
5.分页：sql分页 limit 10
6.mybatis 调用存储过程
7.sqlSession close异常？

public class TestDaoImpl implements ITestDao {
 private SqlSessionTemplate sqlSessionTemplate;

 @Override
 public List<TestPO> query(TestPO po) {
  List<TestPO> list = sqlSessionTemplate.selectList("testMapper.query", po);
  return list;
 }

 @Override
 public boolean add(TestPO po) {
  int i = sqlSessionTemplate.insert("testMapper.add", po);
  boolean suc = false;
  if(i==1){
   suc = true;
  }
  return suc;
 }

 @Override
 public boolean update(TestPO po) {
  int i = sqlSessionTemplate.update("testMapper.update", po);
  boolean suc = false;
  if(i==1){
   suc = true;
  }
  return suc;
 }

 @Override
 public boolean delete(String id) {
  int i = sqlSessionTemplate.delete("testMapper.delete", id);
  boolean suc = false;
  if(i==1){
   suc = true;
  }
  return suc;
 }

 @Override
 public void proc(Map<String, Object> map) {
  sqlSessionTemplate.select("testMapper.procedure", map, null);
 }

 public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
 
  this.sqlSessionTemplate = sqlSessionTemplate;
 }
}

<?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="testMapper">
 <!-- po对象属性映射 -->
 <resultMap id="testMap" type="cn.demo.model.po.TestPO" >
  <result property="userId" column="userId"/>
  <result property="userName" column="userName"/>
  <result property="birthday" column="birthday"/>
  <result property="salary" column="salary"/>
  <result property="ip" column="ip"/>
  <result property="id" column="id"/>
  <result property="content" column="content"/>
  <result property="image" column="image"/>
 </resultMap>
 
 <!-- sql 片段 -->
 <sql id="userFields">
  userId,userName,birthday,salary
 </sql>
 
 <!-- 多表连接查询 -->
 <select id="query" parameterType="java.util.Map" resultMap="testMap">
  select <include refid="userFields"/>,
  B.ip,B.id
  from user A,log B
  where A.userId = B.id
  <if test="userName != '' and userName != null">
   AND A.userName = #{userName}
  </if>
 </select>
 
 <insert id="add" parameterType="cn.demo.model.po.TestPO">
  insert into user(<include refid="userFields"/>)
  values(#{userId, jdbcType=VARCHAR},
  #{userName, jdbcType=VARCHAR},
  #{birthday, jdbcType=DATE},
  #{salary, jdbcType=NUMERIC}
  )
 </insert>
 
 <update id="update" parameterType="cn.demo.model.po.TestPO">
  update user set userName=#{userName},
  birthday = now()
  where userId = #{userId}
 </update>
 
 <!-- CDATA括号内的内容不会被解析，当成文本看待 -->
 <delete id="delete" parameterType="string">
  <![CDATA[ delete from user where userId = #{userId} ]]>
 </delete>

 <!-- mybatis调用存储过程: statementType-CALLABLE -->
 <select id="procedure" statementType="CALLABLE">
  {call p_sum_salary(#{dte, jdbcType=DATE, mode=IN}, #{amt, jdbcType=NUMERIC, mode=OUT})}
 </select>
</mapper>

public class TestPO implements Serializable{
 private String userId;
 private String userName;
 private Date birthday;
 private double salary;

 private String ip;
 private int id;
 //clob
 private String content;
 //blob
 private byte[] image;

 public String getUserId() {
  return userId;
 }

 public void setUserId(String userId) {
  this.userId = userId;
 }

 public String getUserName() {
  return userName;
 }

 public void setUserName(String userName) {
  this.userName = userName;
 }

 public Date getBirthday() {
  return birthday;
 }

 public void setBirthday(Date birthday) {
  this.birthday = birthday;
 }

 public double getSalary() {
  return salary;
 }

 public void setSalary(double salary) {
  this.salary = salary;
 }

 public String getIp() {
  return ip;
 }
 public void setIp(String ip) {
  this.ip = ip;
 }
 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }
 
 public String getContent() {
  return content;
 }
 
 public void setContent(String content) {
  this.content = content;
 }

 public byte[] getImage() {
  return image;
 }

 public void setImage(byte[] image) {
  this.image = image;
 }
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring/*.xml"})
public class DaoTest {
 
 @Autowired
 private ITestDao dao;
 private static Logger log = LoggerFactory.getLogger(DaoTest.class);
 
 @org.junit.Test
 public void query(){
  TestPO po = new TestPO();
  po.setUserName("feifei2");
  List<TestPO> list = dao.query(po);
  log.info("query() list length: "+list.size());
 }
 @org.junit.Test
 public void add(){
  TestPO po = new TestPO();
  po.setUserId("4003");
  po.setUserName("feifei2");
  po.setBirthday(new Date());
  po.setImage("abcd123".getBytes());
  po.setSalary(50);
  boolean f = dao.add(po);
  log.info("add() : "+f);
 }
 @org.junit.Test
 public void update(){
  TestPO po = new TestPO();
  po.setUserId("4000");
  po.setUserName("feifei");
  po.setBirthday(new Date());
  po.setSalary(550);
  boolean f = dao.update(po);
  log.info("update() : "+f);
 }
 @org.junit.Test
 public void delete(){
  String id ="4000";
  boolean f =dao.delete(id);
  log.info("delete() :"+f);
 }
 //调用存储过程
 @org.junit.Test
 public void proc(){
  Map<String,Object> map = new HashMap<String,Object>();
  map.put("dte", new Date());//入参：IN
  dao.proc(map);
  BigDecimal amt = (BigDecimal)map.get("amt"); //出参：OUT
  log.info("proc() amt = "+amt);
 }
}

 delimiter //
 create  procedure p_sum_salary(IN dte Date,OUT amt int)
 begin
 select 100 into amt;
 end
 //