1、如果你确定返回的数据只有一条，你可以这样整
xml中：
<select id="searchncomedateByInvestID" resultMap="java.util.HashMap">
select
t1.invest_id ,
cast(t1.modify_time AS DATE) modify_time
from t_c_wh_redeeminfo t1
where 1=1
and t1.invest_id =#{investId}
</select>
dao中：
Map<String,Object> searchncomedateByInvestID(investId);
2、如果返回的是多条数据，可以这样整
xml中：
<resultMap id="getAllSetDaysResult" type="HashMap">
<result property="investid" column="invest_id" jdbcType="VARCHAR" />
<result property="modifytime" column="modify_time" jdbcType="DATE"/>
</resultMap>
<select id="searchncomedateByInvestID" parameterType="java.util.List" resultMap="getAllSetDaysResult">
select
t1.invest_id ,
cast(t1.modify_time AS DATE) modify_time
from t_c_wh_redeeminfo t1
where 1=1
and t1.invest_id in
<foreach collection="list" item="investId" index="index" open="(" close=")" separator=",">
#{investId}
</foreach>
</select>
dao中：
List<Map<String, Object>> searchncomedateByInvestID(List<String> preinvestList);
值得注意的要点：
1）mybatis中的oracel中某个字段允许为空，后面一定要接上类型 jdbcType=VARCHAR
2）mybatis中in (${arrayIds}),dao中一定要绑定参数
<?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.test.dao.BlobFieldDao">
<sql id="blobFieldColumns">
a.ID AS id,
a.TAB_NAME AS tabName,
a.TAB_PKID_VALUE AS tabPkidValue,
a.BLOB_COL_NAME AS blobColName,
a.BLOB_COL_VALUE AS blobColValue
</sql>
<sql id="blobFieldJoins">
</sql>
<select id="get" resultType="blobField">
SELECT
<include refid="blobFieldColumns" />
FROM BLOB_FIELD a
<include refid="blobFieldJoins" />
WHERE a.ID = #{id}
</select>
<select id="findList" resultType="blobField">
SELECT
<include refid="blobFieldColumns" />
FROM BLOB_FIELD a
<include refid="blobFieldJoins" />
</select>
<insert id="insert">
INSERT INTO BLOB_FIELD(
ID ,
TAB_NAME ,
TAB_PKID_VALUE ,
BLOB_COL_NAME ,
BLOB_COL_VALUE
) VALUES (
#{id},
#{tabName},
#{tabPkidValue},
#{blobColName},
#{blobColValue,jdbcType=BLOB}
)
</insert>
<update id="update">
UPDATE BLOB_FIELD SET
TAB_NAME = #{tabName},
TAB_PKID_VALUE = #{tabPkidValue},
BLOB_COL_NAME = #{blobColName},
BLOB_COL_VALUE = #{blobColValue}
WHERE ID = #{id}
</update>
<delete id="delete">
DELETE FROM BLOB_FIELD
WHERE ID = #{id}
</delete>
</mapper>
------------ 保存blob字段
/**
* 附件上传
*
* @param testId
* 主表Id
* @param request
* @return
* @throws UnsupportedEncodingException
*/
@RequiresPermissions("exc:exceptioninfo:feedback")
@RequestMapping(value = "attachment", method = RequestMethod.POST)
@ResponseBody
public Map<String, Object> uploadAttachment(@RequestParam(value = "testId", required = true) String testId,
HttpServletRequest request)
throws UnsupportedEncodingException {
Map<String, Object> result = new HashMap<String, Object>();
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
// 获得文件
MultipartFile multipartFile = multipartRequest.getFile("Filedata");// 与前端设置的fileDataName属性值一致
String filename = multipartFile.getOriginalFilename();// 文件名称
InputStream is = null;
try {
//读取文件流
is = multipartFile.getInputStream();
byte[] bytes = FileCopyUtils.copyToByteArray(is);
BlobField blobField = new BlobField();
blobField.setTabName("testL");
blobField.setTabPkidValue(testId);
blobField.setBlobColName("attachment");
blobField.setBlobColValue(bytes);
//保存blob字段
this.testService.save(blobField, testId, filename);
result.put("flag", true);
result.put("attachmentId", blobField.getId());
result.put("attachmentName", filename);
} catch (IOException e) {
e.printStackTrace();
result.put("flag", false);
} finally {
IOUtils.closeQuietly(is);
}
return result;
}
-------------------- 读取blob字段
/**
* 下载附件
*
* @param attachmentId
* @return
*/
@RequiresPermissions("exc:exceptioninfo:view")
@RequestMapping(value = "download", method = RequestMethod.GET)
public void download(@RequestParam(value = "attachmentId", required = true) String attachmentId,
@RequestParam(value = "attachmentName", required = true) String attachmentName, HttpServletRequest
request, HttpServletResponse response) {
ServletOutputStream out = null;
try {
response.reset();
String userAgent = request.getHeader("User-Agent");
byte[] bytes = userAgent.contains("MSIE") ? attachmentName.getBytes() : attachmentName.getBytes("UTF-
8"); // fileName.getBytes("UTF-8")处理safari的乱码问题
String fileName = new String(bytes, "ISO-8859-1");
// 设置输出的格式
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(attachmentName,
"UTF-8"));
BlobField blobField = this.blobFieldService.get(attachmentId);
//获取blob字段
byte[] contents = blobField.getBlobColValue();
out = response.getOutputStream();
//写到输出流
out.write(contents);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}