批量插入sql语句:
INSERT INTO table (field1,field2,field3) VALUES ('a',"b","c"), ('a',"b","c"),('a',"b","c")
mybatis通过foreach循环拼装了如上的sql语句。
一、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" >
<mapper
namespace="com.xxx.mapper.XXXRecordMapper">
<resultMap id="BaseResultMap" type="com.xxx.model.XXXRecord">
<id column="AutoId" property="autoid" jdbcType="BIGINT" />
<result column="UserId" property="userid" jdbcType="BIGINT" />
<result column="NoticedTime" property="noticedtime" jdbcType="TIMESTAMP" />
</resultMap>
<sql id="Base_Column_List">
AutoId, UserId, NoticedTime
</sql>
<!-- myself:批量插入 -->
<insert id="insertBatch" parameterType="java.util.List">
insert into T_XXXRecord (AutoId, UserId, NoticedTime) values
<foreach collection="list" item="item" index="index" separator=",">
(#{item.autoid,jdbcType=BIGINT},
#{item.userid,jdbcType=BIGINT},
#{item.noticedtime,jdbcType=TIMESTAMP})
</foreach>
</insert>
</mapper>
说明:
- mysql批量插入的限制是一次批量:1M
- 我这里插入的List,如上就好,如果是其他结构,查看这篇博客:http://www.cnblogs.com/admol/articles/4248159.html
- collection属性:
1.如果传入的是单参数且参数类型是一个List的时候,collection属性值为list
2.如果传入的是单参数且参数类型是一个array数组的时候,collection的属性值为array
3.如果传入的参数是多个的时候,我们就需要把它们封装成一个Map了,当然单参数也可以封装成map