在MyBatis中,如果要查看blob內容,可以通過以下步驟實現:
public interface BlobMapper {
Blob selectBlobDataById(Integer id);
}
<?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.example.mapper.BlobMapper">
<select id="selectBlobDataById" resultType="java.sql.Blob">
SELECT blob_data
FROM my_table
WHERE id = #{id}
</select>
</mapper>
public class Main {
public static void main(String[] args) {
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("mybatis-config.xml"));
SqlSession sqlSession = sqlSessionFactory.openSession();
BlobMapper blobMapper = sqlSession.getMapper(BlobMapper.class);
Blob blob = blobMapper.selectBlobDataById(1);
//將Blob數據轉換為字節數組
byte[] data = blob.getBytes(1, (int) blob.length());
//輸出blob數據
System.out.println(Arrays.toString(data));
sqlSession.close();
}
}
通過以上步驟,可以獲取到blob數據并進行查看。需要注意的是,要根據具體的業務需求修改查詢語句和數據處理邏輯。