Mybatis通过接口的方式实现增删改查

　　导入jar包

　　【mybatis】

　　

　　【oracle】

　　

　　生成数据库

　　

　　

　　1、添加Mybatis的配置文件mybatis-config.xml

　　在src目录下创建一个mybatis-config.xml文件，如下图所示：

　　

　　

<?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>
      <properties resource="db.properties"></properties>
      <typeAliases>
          <package name="com.model"/>
      </typeAliases>

      <environments default="development">
          <environment id="development">
              <transactionManager type="JDBC" />
              <dataSource type="POOLED">
                  <property name="username" value="${jdbc.username}"/>
                  <property name="password" value="${jdbc.password}"/>
                  <property name="url" value="${jdbc.url}"/>
                  <property name="driver" value="${jdbc.driverClass}"/>
              </dataSource>

          </environment>
      </environments>

      <mappers>
          <!-- <mapper resource="com/dao/UserMapper.xml"/> -->
          <package name="com.dao"/>
      </mappers>
  </configuration>

　　db.properties如下：

jdbc.username=root
jdbc.password=123
jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl
jdbc.driverClass=oracle.jdbc.OracleDriver

　　2、定义表所对应的实体类，如下图所示：

　　

package com.model;
// Generated 2017-4-19 10:19:42 by Hibernate Tools 5.2.0.CR1

import java.math.BigDecimal;

import org.apache.ibatis.type.Alias;

/**
 * TestId generated by hbm2java
 */
public class TestId {

    private BigDecimal id;
    private String username;
    private String password;

    public TestId() {
    }

    public TestId(BigDecimal id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public BigDecimal getId() {
        return this.id;
    }

    public void setId(BigDecimal id) {
        this.id = id;
    }

    public String getUsername() {
        return this.username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return this.password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public boolean equals(Object other) {
        if ((this == other))
            return true;
        if ((other == null))
            return false;
        if (!(other instanceof TestId))
            return false;
        TestId castOther = (TestId) other;

        return ((this.getId() == castOther.getId())
                || (this.getId() != null && castOther.getId() != null && this.getId().equals(castOther.getId())))
                && ((this.getUsername() == castOther.getUsername()) || (this.getUsername() != null
                        && castOther.getUsername() != null && this.getUsername().equals(castOther.getUsername())))
                && ((this.getPassword() == castOther.getPassword()) || (this.getPassword() != null
                        && castOther.getPassword() != null && this.getPassword().equals(castOther.getPassword())));
    }

    public int hashCode() {
        int result = 17;

        result = 37 * result + (getId() == null ? 0 : this.getId().hashCode());
        result = 37 * result + (getUsername() == null ? 0 : this.getUsername().hashCode());
        result = 37 * result + (getPassword() == null ? 0 : this.getPassword().hashCode());
        return result;
    }

    @Override
    public String toString() {
        return "TestId [id=" + id + ", username=" + username + ", password=" + password + "]";
    }

}

package com.model;

import java.util.Date;

public class TestInfo {
    private Integer ids;
    private TestId testId;
    private String address;
    private Date birthday;
    public Integer getIds() {
        return ids;
    }
    public void setIds(Integer ids) {
        this.ids = ids;
    }
    public TestId getTestId() {
        return testId;
    }
    public void setTestId(TestId testId) {
        this.testId = testId;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public TestInfo(Integer ids, TestId testId, String address, Date birthday) {
        super();
        this.ids = ids;
        this.testId = testId;
        this.address = address;
        this.birthday = birthday;
    }
    public TestInfo() {
        super();
    }
    @Override
    public String toString() {
        return "TestInfo [ids=" + ids + ", testId=" + testId + ", address=" + address + ", birthday=" + birthday + "]";
    }

}

　　　3、定义操作test表的sql映射文件

　　

UserInfoMapper.java接口如下：

package com.dao;

import java.util.List;

import com.model.TestInfo;

public interface UserInfoMapper {
    public List<TestInfo> select();
}

UserMapper.java接口如下：

package com.dao;

import java.util.List;
import java.util.Map;

import com.model.TestId;

public interface UserMapper {
    public Integer add(TestId ti);

    public Integer delete(Integer id);

    public Integer update(TestId ti);

    public TestId select(Integer id);

    public List<TestId> selectlist(Map<String, Object> map);
}

UserInfoMapper.xml如下：

<?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.dao.UserInfoMapper">
　　　　<!-- 一对一级连查询方法1 -->
      <resultMap type="testInfo" id="userslist">
          <id property="ids" column="ids"/>

          <result property="testId.id" column="id"/>
          <result property="testId.username" column="username"/>
          <result property="testId.password" column="password"/>

          <result property="address" column="address"/>
          <result property="birthday" column="birthday"/>
      </resultMap>
      <!-- 一对一级连查询方法2 -->
      <resultMap type="testInfo" id="userlist">
          <association property="testId" column="id" select="com.dao.UserMapper.select"></association>
      </resultMap>

      <select id="select" resultMap="userslist">
          select * from testinfo ti left join test t on ti.id=t.id
      </select>
  </mapper>

UserMapper.xml如下：

<?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.dao.UserMapper">

    <resultMap type="testId" id="users"></resultMap>

    <insert id="add" parameterType="testId">
        insert into test values(sq_mybatis.nextval,#{username},#{password})
    </insert>

    <delete id="delete" parameterType="Integer">
        delete test t where t.id=#{id}
    </delete>

    <update id="update" parameterType="testId">
        update test t set t.username=#{username},t.password=#{password} where t.id=#{id}
    </update>

    <select id="select" parameterType="Integer" resultType="testId">
        select * from test t where t.id=#{id}
    </select>

    <select id="selectlist" parameterType="Map" resultMap="users">
        select * from test t where t.username like #{username} and t.password like #{password}
    </select>
</mapper>

　　4、创建一个MybatisUtil的和Junit的类，来进行测试

　　 

MybatisUtil.java如下：

package com.util;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

/**
 * mybatis工具类
 * @author Administrator
 *
 */
public class MybatisUtil {
    private static SqlSessionFactory ssf;
    private static SqlSession ss;

    /**
     * 获取mybatis核心sqlsessionfactory
     * @return
     */
    private static SqlSessionFactory getSqlSessionFctory(){
        InputStream it = null;

        try {
            it = Resources.getResourceAsStream("mybatis-config.xml");
            ssf= new SqlSessionFactoryBuilder().build(it);
            ss=ssf.openSession();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return ssf;
    }
    /**
     * 获取sqlsession
     * @return
     */
    public static SqlSession getSqlSession(){
        ss= getSqlSessionFctory().openSession();
        return ss;

    }
    public static void main(String[] args){
        System.out.println(getSqlSession());
    }
}

Junit.java如下：

package com.util;

import static org.junit.Assert.*;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.dao.UserMapper;
import com.model.TestId;

public class Junit {

    private SqlSession ss;
    private UserMapper um;

    @Before
    public void setUp() throws Exception {
        ss=MybatisUtil.getSqlSession();
        um=ss.getMapper(UserMapper.class);
    }

    @After
    public void tearDown() throws Exception {
        ss.commit();
        ss.close();
    }

    public void test() {
        TestId ti = new TestId();
        ti.setUsername("张张柳");
        ti.setPassword("443221");
        //int i =ss.insert("com.dao.UserMapper.add",ti);
        int i=um.add(ti);
        System.out.println(i);
    }

    public void test1(){
        int i = um.delete(401);
        System.out.println(i);
    }

    public void test2(){
        TestId ti = new TestId();
        ti.setId(new BigDecimal(441));
        ti.setUsername("张张柳2");
        ti.setPassword("443221");

        um.update(ti);
    }

    public void test3(){
        TestId ti =um.select(441);
        System.out.println(ti);
    }
    @Test
    public void tes4(){
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("username", "张%");
        map.put("password", "%2%");
        List<TestId> list =um.selectlist(map);
        for(TestId ti:list){
            System.out.println(ti);
        }

    }

}

Junit2.java如下：

package com.util;

import static org.junit.Assert.*;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.dao.UserInfoMapper;
import com.dao.UserMapper;
import com.model.TestId;
import com.model.TestInfo;

public class Junit2 {

    private SqlSession ss;
    private UserInfoMapper um;

    @Before
    public void setUp() throws Exception {
        ss=MybatisUtil.getSqlSession();
        um=ss.getMapper(UserInfoMapper.class);
    }

    @After
    public void tearDown() throws Exception {
        ss.commit();
        ss.close();
    }

    @Test
    public void test() {
        List<TestInfo> list = um.select();
        for(TestInfo ti :list){
            System.out.println(ti);
        }
    }

}