3.insert添加用法

一.新增用户接口

UserMapper.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.annotations.Param;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.List;

/**
 * @author weihu
 * @date 2018/8/3/003 0:01
 */
public interface UserMapper {

    /**
     * 新增用户
     */
    int insertUser(SysUser sysUser);

}

 

UserMapper.xml

<?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">
<!--sql语句映射文件-->

<!--因为已经配置了别名,所以resultType可以直接写类名,没有配置的话就要写类全名-->
<mapper namespace="tk.mybatis.simple.mapper.UserMapper">

    <!--添加用户,不需要返回值类型-->
    <insert id="insertUser" parameterType="tk.mybatis.simple.model.SysUser">
        INSERT INTO sys_user (
            id,
            user_name,
            user_password ,
            user_email,
            user_info,
            head_img,
            create_time)
        VALUES
            (#{id},#{userName},#{userPassword},#{userEmail},#{userInfo},#{headImg,jdbcType=BLOB},#{createTime,jdbcType=TIMESTAMP})
    </insert>

</mapper>

   id:命名空间唯一标识符，可用来代表这条语句。

parameterType：即将传入的语句参数的完全限定类名或别名。这个属性是可选的，因为MyBatis可以推断出出入语句的具体参数，因此不建议配置该属性。

jdbcType:为了防止类型错误，对于一些特殊的数据类型，建议指定具体的jdbcType值。

UserMapperTest.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.session.SqlSession;
import org.junit.Assert;
import org.junit.Test;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.Date;
import java.util.List;

/**
 * @author weihu
 * @date 2018/8/5/005 9:34
 * @desc
 */
public class UserMapperTest extends BaseMapperTest {

    /**
     * 插入用户
     */
    @Test
    public void insertUserTest(){
        SqlSession sqlSession = getSqlSession();
        try {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            //创建一个user对象
            SysUser sysUser=new SysUser();
            sysUser.setId(4L);
            sysUser.setUserName("huge");
            sysUser.setUserPassword("");
            sysUser.setUserEmail("1210740934@qq.com");
            sysUser.setUserInfo("测试用户");
            sysUser.setHeadImg(new byte[]{,,});
        /*
            插入的时间格式
            sysUser.setCreateTime("2018-08-05 17:00:58");插入这种的时间格式是不正确的
         */
            sysUser.setCreateTime(new Date());
            int result = userMapper.insertUser(sysUser);
            System.out.println("插入1条数据"+result);
            //注意一定要commit(),不提交的话数据是插入不到数据库中的
            sqlSession.commit();
        } catch (Exception e) {
            e.printStackTrace();
            //数据插入不成功进行回滚
            sqlSession.rollback();
        } finally {
            //关闭sqlSession
            sqlSession.close();
        }
    }

}

二、返回主键自增的值

UserMapper.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.annotations.Param;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.List;

/**
 * @author weihu
 * @date 2018/8/3/003 0:01
 */
public interface UserMapper {

    /**
     * 获取主键自增Id
     */
    int insertPrimaryKey(SysUser sysUser);

}

UserMapper.xml

<?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">
<!--sql语句映射文件-->

<!--因为已经配置了别名,所以resultType可以直接写类名,没有配置的话就要写类全名-->
<mapper namespace="tk.mybatis.simple.mapper.UserMapper">

    <insert id="insertPrimaryKey" parameterType="tk.mybatis.simple.model.SysUser" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO sys_user (
            user_name,
            user_password ,
            user_email,
            user_info,
            head_img,
            create_time)
        VALUES
            (#{userName},#{userPassword},#{userEmail},#{userInfo},#{headImg,jdbcType=BLOB},#{createTime,jdbcType=TIMESTAMP})
    </insert>

</mapper>

UserMapperTest.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.session.SqlSession;
import org.junit.Assert;
import org.junit.Test;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.Date;
import java.util.List;

/**
 * @author weihu
 * @date 2018/8/5/005 9:34
 * @desc
 */
public class UserMapperTest extends BaseMapperTest {

    @Test
    public void insertGetPrimayKey(){
        SqlSession sqlSession = getSqlSession();
        try {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            //创建一个user对象
            SysUser sysUser=new SysUser();
            sysUser.setUserName("huge2");
            sysUser.setUserPassword("");
            sysUser.setUserEmail("1210740934@qq.com");
            sysUser.setUserInfo("测试用户");
            sysUser.setHeadImg(new byte[]{,,});
            int result=userMapper.insertPrimaryKey(sysUser);
            sqlSession.commit();
　　　　　　　//自动获取id
         System.out.println(sysUser.getId());
        } catch (Exception e) {
            //数据插入不成功进行回滚
            sqlSession.rollback();
            e.printStackTrace();
        } finally {
            //关闭sqlSession
            sqlSession.close();
        }
    }

}

三、使用selectKey返回主键的值

UserMapper.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.annotations.Param;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.List;

/**
 * @author weihu
 * @date 2018/8/3/003 0:01
 */
public interface UserMapper {

    /**
     * 获取主键，主键自增和非自增主键都可以获取
     */
    int insertAnyPrimaryKey(SysUser sysUser);
}

UserMapper.xml

<?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">
<!--sql语句映射文件-->

<!--因为已经配置了别名,所以resultType可以直接写类名,没有配置的话就要写类全名-->
<mapper namespace="tk.mybatis.simple.mapper.UserMapper">

    <insert id="insertAnyPrimaryKey" parameterType="tk.mybatis.simple.model.SysUser">
        INSERT INTO sys_user (
            user_name,
            user_password ,
            user_email,
            user_info,
            head_img,
            create_time)
        VALUES
            (#{userName},#{userPassword},#{userEmail},#{userInfo},#{headImg,jdbcType=BLOB},#{createTime,jdbcType=TIMESTAMP})
        <selectKey keyColumn="id" resultType="long" keyProperty="id" order="AFTER">
            SELECT LAST_INSERT_ID()
        </selectKey>
    </insert>
</mapper>

order属性设置和使用的数据库有关,msyql用AFTER，Oracle用BEFORE

SELECT LAST_INSERT_ID()用于获取数据库中最后插入的数据的ID值。

UserMapperTest.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.session.SqlSession;
import org.junit.Assert;
import org.junit.Test;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.Date;
import java.util.List;

/**
 * @author weihu
 * @date 2018/8/5/005 9:34
 * @desc
 */
public class UserMapperTest extends BaseMapperTest {

    @Test
    public void insertAnyPrimaryKey(){
        SqlSession sqlSession = getSqlSession();
        try {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            //创建一个user对象
            SysUser sysUser=new SysUser();
            sysUser.setUserName("huge2");
            sysUser.setUserPassword("");
            sysUser.setUserEmail("1210740934@qq.com");
            sysUser.setUserInfo("测试用户");
            sysUser.setHeadImg(new byte[]{,,});
            int result=userMapper.insertAnyPrimaryKey(sysUser);
            sqlSession.commit();
          System.out.println(sysUser.getId());
        } catch (Exception e) {
            //数据插入不成功进行回滚
            sqlSession.rollback();
            e.printStackTrace();
        } finally {
            //关闭sqlSession
            sqlSession.close();
        }
    }
}