数据库------MyBatis 使用 foreach 批量插入_mybatis foreach插入

MyBatis 使用 foreach 批量插入

1. 第1种方式 单条语句插入多个值

修改 Mapper 添加批量插入方法

@Mapper
public interface UserMapper {
    void batchSave(List<User> userList);
}
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修改映射文件 添加批量插入映射语句

<insert id="batchSave">
    insert into user(name, password) values
    <foreach collection="list" item="user" separator=",">
        (#{user.name}, #{user.password})
    </foreach>
</insert>
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测试接口

@RunWith(SpringRunner.class)
@SpringBootTest
public class SbMybatis02ApplicationTests {
    @Test
    public void testBatchSave(){
        User user1 = new User();
        user1.setName("关羽");
        user1.setPassword("guanyu");
        User user2 = new User();
        user2.setName("张飞");
        user2.setPassword("zhangfei");
        List<User> userList  = new ArrayList<>();
        userList.add(user1);
        userList.add(user2);

        userMapper.batchSave(userList);
    }
}
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2. 第2种方式 多条语句插入多个值

修改 Mapper 添加批量插入方法

@Mapper
public interface UserMapper {
    void batchSave(List<User> userList);
}
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修改映射文件 添加批量插入映射语句

<insert id="batchSave">
    <foreach collection="list" item="user" separator=";">
        insert into user(name, password) values
        (#{user.name}, #{user.password})
    </foreach>
</insert>
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修改 jdbcUrl 允许执行多条语句

jdbc:mysql://localhost:3306/db3?serverTimezone=Asia/Shanghai&allowMultiQueries=true
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测试接口

@RunWith(SpringRunner.class)
@SpringBootTest
public class SbMybatis02ApplicationTests {
    @Test
    public void testBatchSave(){
        User user1 = new User();
        user1.setName("关羽");
        user1.setPassword("guanyu");
        User user2 = new User();
        user2.setName("张飞");
        user2.setPassword("zhangfei");
        List<User> userList  = new ArrayList<>();
        userList.add(user1);
        userList.add(user2);

        userMapper.batchSave(userList);
    }
}
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3. bugs

Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insert into user(name, password) values('张飞', 'zhangfei')' at line 4
方案:
	jdbcUrl 添加参数 allowMultiQueries=true
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