mybatis + mysql 批量插入、删除、更新

mybatis + mysql 批量插入、删除、更新

Student 表结构

批量插入

public int insertBatchStudent(List<Student> students);

<insert id="insertBatchStudent" parameterType="java.util.List" useGeneratedKeys="true">
    <selectKey resultType="Long" keyProperty="id" order="AFTER">
        SELECT LAST_INSERT_ID()
    </selectKey>
    insert into student(stu_no,stu_name,age,sex,address)
    values
    <foreach collection="list" item="stu" index="index" separator=",">
        (#{stu.stuNo},
        #{stu.stuName},
        #{stu.age},
        #{stu.sex},
        #{stu.address})
    </foreach>
</insert>

根据数组批量删除

public int deleteStudentByIds(String[] ids);

<delete id="deleteStudentByIds" parameterType="String">
    delete from student where id in
    <foreach item="id" collection="array" open="(" separator="," close=")">
        #{id}
    </foreach>
</delete>

根据集合批量删除

public int deleteStudentByIds(List<String> ids);

<delete id="deleteStudentByIds" parameterType="java.util.List">
    delete from student where id in
    <foreach item="id" collection="list" open="(" separator="," close=")">
        #{id}
    </foreach>
</delete>

批量更新

public int updateBatchStudent(List<Student> students);

<update id="updateBatchStudent" parameterType="java.util.List">
    update student set
    stu_no =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.stuNo}
    </foreach>
    ,stu_name =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.stuName}
    </foreach>
    ,age =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.age}
    </foreach>
    ,sex =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.sex}
    </foreach>
    ,address =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.address}
    </foreach>
    where id in
    <foreach collection="list" item="stu" index="index" separator="," open="(" close=")">
        #{stu.id}
    </foreach>
</update>

参考代码

Student.java

```java
package cn.hgnulb.student.domain;

import com.baomidou.mybatisplus.annotation.TableId;

import com.baomidou.mybatisplus.annotation.TableName;

import org.apache.commons.lang3.builder.ToStringBuilder;

import org.apache.commons.lang3.builder.ToStringStyle;

import java.io.Serializable;

@TableName("student")

public class Student implements Serializable {

private static final long serialVersionUID = 1L;

/** 主键 */
@TableId
private Long id;

/** 学号 */
private String stuNo;

/** 姓名 */
private String stuName;

/** 年龄 */
private Integer age;

/** 用户性别（0男 1女 2未知） */
private String sex;

/** 地址 */
private String address;

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

public Long getId() {
    return id;
}

public void setStuNo(String stuNo) {
    this.stuNo = stuNo;
}

public String getStuNo() {
    return stuNo;
}

public void setStuName(String stuName) {
    this.stuName = stuName;
}

public String getStuName() {
    return stuName;
}

public void setAge(Integer age) {
    this.age = age;
}

public Integer getAge() {
    return age;
}

public void setSex(String sex) {
    this.sex = sex;
}

public String getSex() {
    return sex;
}

public void setAddress(String address) {
    this.address = address;
}

public String getAddress() {
    return address;
}

@Override
public String toString() {
    return new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE)
            .append("id", getId())
            .append("stuNo", getStuNo())
            .append("stuName", getStuName())
            .append("age", getAge())
            .append("sex", getSex())
            .append("address", getAddress())
            .toString();
}

}

</div>

<span class="badge badge-pill badge-danger" data-toggle="collapse" data-target="#mapper_java">StudentMapper.java</span>
<div class="collapse" id="mapper_java">
```java
package cn.hgnulb.student.mapper;

import cn.hgnulb.student.domain.Student;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import java.util.List;

public interface StudentMapper extends BaseMapper<Student> {
    Student selectStudentById(Long id);

    List<Student> selectStudentList(Student student);

    int insertStudent(Student student);

    int insertBatchStudent(List<Student> students);

    int updateBatchStudent(List<Student> students);

    int updateStudent(Student student);

    int deleteStudentById(Long id);

    int deleteStudentByArrayIds(String[] ids);

    int deleteStudentByListIds(List<String> ids);
}

StudentMapper.xml

```xml

<resultMap type="Student" id="StudentResult">
    <result property="id" column="id"/>
    <result property="stuNo" column="stu_no"/>
    <result property="stuName" column="stu_name"/>
    <result property="age" column="age"/>
    <result property="sex" column="sex"/>
    <result property="address" column="address"/>
</resultMap>

<sql id="selectStudentVo">
    select id, stu_no, stu_name, age, sex, address from student
</sql>

<!--按条件查询-->
<select id="selectStudentList" parameterType="Student" resultMap="StudentResult">
    <include refid="selectStudentVo"/>
    <where>
        <if test="stuNo != null  and stuNo != ''">and stu_no = #{stuNo}</if>
        <if test="stuName != null  and stuName != ''">and stu_name like concat('%', #{stuName}, '%')</if>
        <if test="age != null ">and age = #{age}</if>
        <if test="sex != null  and sex != ''">and sex = #{sex}</if>
    </where>
</select>

<!--按ID查询-->
<select id="selectStudentById" parameterType="Long" resultMap="StudentResult">
    <include refid="selectStudentVo"/>
    where id = #{id}
</select>

<!--插入-->
<insert id="insertStudent" parameterType="Student" useGeneratedKeys="true" keyProperty="id">
    insert into student
    <trim prefix="(" suffix=")" suffixOverrides=",">
        <if test="stuNo != null  and stuNo != ''">stu_no,</if>
        <if test="stuName != null  and stuName != ''">stu_name,</if>
        <if test="age != null ">age,</if>
        <if test="sex != null  and sex != ''">sex,</if>
        <if test="address != null  and address != ''">address,</if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
        <if test="stuNo != null  and stuNo != ''">#{stuNo},</if>
        <if test="stuName != null  and stuName != ''">#{stuName},</if>
        <if test="age != null ">#{age},</if>
        <if test="sex != null  and sex != ''">#{sex},</if>
        <if test="address != null  and address != ''">#{address},</if>
    </trim>
</insert>

<!--按ID删除-->
<delete id="deleteStudentById" parameterType="Long">
    delete from student where id = #{id}
</delete>

<!--按ID更新-->
<update id="updateStudent" parameterType="Student">
    update student
    <trim prefix="SET" suffixOverrides=",">
        <if test="stuNo != null  and stuNo != ''">stu_no = #{stuNo},</if>
        <if test="stuName != null  and stuName != ''">stu_name = #{stuName},</if>
        <if test="age != null ">age = #{age},</if>
        <if test="sex != null  and sex != ''">sex = #{sex},</if>
        <if test="address != null  and address != ''">address = #{address},</if>
    </trim>
    where id = #{id}
</update>

<!--批量插入-->
<insert id="insertBatchStudent" parameterType="java.util.List" useGeneratedKeys="true">
    <selectKey resultType="Long" keyProperty="id" order="AFTER">
        SELECT LAST_INSERT_ID()
    </selectKey>
    insert into student(stu_no,stu_name,age,sex,address)
    values
    <foreach collection="list" item="stu" index="index" separator=",">
        (#{stu.stuNo},
        #{stu.stuName},
        #{stu.age},
        #{stu.sex},
        #{stu.address})
    </foreach>
</insert>

<!--按数组批量删除-->
<delete id="deleteStudentByArrayIds" parameterType="String">
    delete from student where id in
    <foreach item="id" collection="array" open="(" separator="," close=")">
        #{id}
    </foreach>
</delete>

<!--按集合批量删除-->
<delete id="deleteStudentByListIds" parameterType="java.util.List">
    delete from student where id in
    <foreach item="id" collection="list" open="(" separator="," close=")">
        #{id}
    </foreach>
</delete>

<!--批量更新-->
<update id="updateBatchStudent" parameterType="java.util.List">
    update student set
    stu_no =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.stuNo}
    </foreach>
    ,stu_name =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.stuName}
    </foreach>
    ,age =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.age}
    </foreach>
    ,sex =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.sex}
    </foreach>
    ,address =
    <foreach collection="list" item="stu" index="index" separator=" " open="case id" close="end">
        when #{stu.id} then #{stu.address}
    </foreach>
    where id in
    <foreach collection="list" item="stu" index="index" separator="," open="(" close=")">
        #{stu.id}
    </foreach>
</update>

```