Mybatis：Oracle批量新增、批量修改

Oracle批量新增

1、创建 SEQUENCE ，用于自增主键

CREATE SEQUENCE  TEST_SEQ
    minvalue 1
    maxvalue 9999999999999999999
    start with 1
    increment by 1
    cache 100;

2、创建实体类，用于存数据

@Data
@Accessors(chain = true)
public class Student {
    /**
     * 主键(自增用TEST_SEQ)
     */
    private Long id;
    /**
     * 名字
     */
    private String name;
    
}

3、造数据，不用造自增id

List<Student> list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            Student student = new Student();
            student.setName(String.valueOf(Math.random()));
            list.add(student);
        }
// 获取自增id
List<Student> studentList = studentMapper.selectBatchidBySequence(list);
// 批量新增
Integer studentResults = studentMapper.insertBatchStudent(mpPointsOpenList);

4、使用 SEQUENCE ，获取自增id

    <select id="selectBatchidBySequence" resultType="com.zhao.test.pojo.Student">
        select TEST_SEQ.nextval as id, t.* from (
        <foreach collection="list" index="index" item="item" separator="union all">
            select
            #{item.name,jdbcType=VARCHAR} as name
            from dual
        </foreach>
        )t
    </select>

5、批量新增

    <insert id="insertBatchStudent">
        insert into STUDENT (ID,NAME)
        select * from (
        <foreach collection="list" item="item" separator="union all">
            select #{item.id,jdbcType=BIGINT},#{item.name,jdbcType=VARCHAR}
            from dual
        </foreach>
            )
    </insert>

Oracle批量修改

还是用之前的实体类做修改

1、造数据

List<Student> list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            Student student = new Student();
            student.setName(String.valueOf(Math.random()));
            // 这里应为数据库有的id
            student.setId((long) (Math.random() * 1000));
            list.add(student);
        }
// 批量修改
Integer studentResults = studentMapper.updateBatchStudent(list);

2、批量修改

    <update id="updateBatchStudent">
        <foreach collection="list" item="item" separator=";" open="begin" close=";end;">
            update STUDENT
            <trim prefix="set" suffixOverrides=",">
                <if test="item.name != null">NAME=#{item.name},</if>
            </trim>
            where ID = #{item.id}
        </foreach>
    </update>