前端数据
有如下需求,前端提交一个对象cabinData,保存到数据表中,对象结构如下:
{
"shipId":"424",
"shipName":"大唐2号",
"ballastCabinData":["艏尖舱","双层底1左","双层底1右","双层底2左","双层底2右","双层底3左","双层底3右","双层底4左","双层底4右","双层底5左","双层底5右","顶边5左","顶边5右","尾尖舱"],
"freshCabinData":["淡水舱1左","淡水舱1右"]
}
数据表结构
数据表是oracle,表结构为:
后端Controller:
@PostMapping("/savecabin")
public AjaxResult savecabin(@RequestBody Map<String,Object> postCabinData){
// 获取map中的参数
String shipIdStr = (String) postCabinData.get("shipId");
Integer shipId = Integer.valueOf(shipIdStr);
String shipName = (String) postCabinData.get("shipName");
List<String> ballastCabinData = (List<String>) postCabinData.get("ballastCabinData");
List<String> freshCabinData = (List<String>) postCabinData.get("freshCabinData");
// 获取shipid下的所有的船舱记录
List<DraftCabin> list = draftCabinService.selectCabinByShipId(shipId);
// 船舱记录大于0时,执行批量删除;船舱
if (list.size()>0){
List<Long> idcards= list.stream().map(DraftCabin::getCabinId).collect(Collectors.toList());
Long[] ids = idcards.toArray(new Long[idcards.size()]);
draftCabinService.deleteDraftCabinByIds(ids);
}
// 批量插入船舱
draftCabinService.insertDraftCabins(ballastCabinData,shipId,"压舱水",shipName);
draftCabinService.insertDraftCabins(freshCabinData,shipId,"淡水",shipName);
return AjaxResult.success();
}
解析:
- 使用
Map<String,Object>
来接收前端cabinData的JSON对象:使用map.get("shipId")方法来解析JSON获得对应的值。 - 批量删除时,使用list.stream().map(DraftCabin::getCabinId).collect(Collectors.toList())方法,使用类中的getCabinId方法来将结果集中的cabbinId形成数组参数,入参批量删除方法
deleteDraftCabinByIds
- 批量插入时,调用service的insertDraftCabins方法,传入四个参数(ballastCabinData,shipId,"压舱水",shipName)
mapper
public int insertDraftCabins(@Param("DraftCabin")List DraftCabin, @Param("shipId")Integer shipId, @Param("cabinType")String cabinType,@Param("shipName")String shipName) ;
解析:
mapper中,多个参数使用@Param注解来接收,在mybaits的xml中,调用注解名称。
xml
<!--批量新增-->
<insert id="insertDraftCabins" useGeneratedKeys="false">
INSERT ALL
<foreach collection="DraftCabin" item="item" index="index">
INTO draft_cabin
(cabin_name,ship_id,cabin_type,ship_name)
values(#{item},#{shipId},#{cabinType},#{shipName,jdbcType=VARCHAR})
</foreach>
SELECT 1 FROM DUAL
</insert>
解析:
- 批量新增
insertDraftCabins
,接收多个参数,这时不要添加parameterType属性,useGeneratedKeys="false",一定要添加; - foreach的collection是要遍历的对象,这里填写mapper中的注解名称;
orcale的批量插入方法与mysql有很大区别,这里需要注意以下:
insert all
into <tableName>[(<table_column1>,<table_column2>...)]
values([<column_value1>,<column_value2>...])
[into <tableName>[(<table_column1>,<table_column2>...)]
values([<column_value1>,<column_value2>...])]...
select <table_value1>[,<table_value2>...] from dual;
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