在将记录插入表之前如何处理java中的非空字段

Question

我正在尝试使用spring data jpa 实现post 请求。我正在尝试在房间表中添加具有一些值的新房间。房间表中的某些列不为空，我将其设置为默认值。但是当我插入时，我收到violates not-null constraint 的错误。

RoomService 类

// Add new Room Details
    public String addNewRoom(@RequestBody RoomInformation roomInfo) {

        Room roomRecord = new Room();

        if(roomInfo.nCampusId != 0)
        roomRecord.nCampusId = roomInfo.nCampusId;

        if(roomInfo.nBuildId != 0)
        roomRecord.nBuildId=roomInfo.nBuildId;

        if(roomInfo.nCRTCodeId !=0)
        roomRecord.nCRTCodeId=roomInfo.nCRTCodeId;

        roomRecord.nInstId=roomInfo.nInstId;
        roomRecord.sRoomNumber=roomInfo.sRoomNumber;
        roomRecord.sRoomDesc=roomInfo.sRoomDesc;
        roomRecord.nArea=roomInfo.nArea;
        roomRecord.sFloor=roomInfo.sFloor;
        roomRecord.bIsActive= true; 

        roomRepository.save(roomRecord);            

        return "New room added sucessfully";
    }

餐桌

CREATE TABLE public.room
(
    nroom_id numeric(18,0) NOT NULL DEFAULT nextval('room_seq'::regclass),
    ncampus_id numeric(18,0),
    nbuild_id numeric(18,0),
    ninst_id numeric(18,0) NOT NULL DEFAULT 0,
    sfloor character varying(10) COLLATE pg_catalog."default",
    sroom_number character varying(10) COLLATE pg_catalog."default",
    sroom_desc character varying(255) COLLATE pg_catalog."default",
    scomments text COLLATE pg_catalog."default",
    daccepted_date timestamp(3) without time zone,
    ssurveyor character varying(255) COLLATE pg_catalog."default",
    narea integer,
    ncrt_code_id numeric(18,0),
    ncmn_room_bln smallint,
    nunvalidated_bln smallint,
    sbfr_field character varying(50) COLLATE pg_catalog."default",
    ntemp_room_id numeric(18,0),
    bis_active boolean NOT NULL DEFAULT false,
    bis_jointuse boolean NOT NULL DEFAULT false,
    sstations_desc character varying(25) COLLATE pg_catalog."default",
    ddeleted_on timestamp(3) without time zone,
    ndeleted_by numeric(18,0),
    bis_incluster boolean NOT NULL DEFAULT false,
    bis_service_center_activity boolean NOT NULL DEFAULT false,
    service_center_comments text COLLATE pg_catalog."default",
    CONSTRAINT pk_roomdeails PRIMARY KEY (nroom_id),
        )

控制台出错

“bis_jointuse”列中的空值违反非空约束

Detail: Failing row contains (1203521, 270, 11135, 106, 0, 10, abc, null, null, null, 22, 2122, null, null, null, null, t, null, null, null, null, null, null, null).

Answer 1

您需要跳过列或提供DEFAULT 关键字而不是显式NULL：

INSERT INTO tab(col1,...,bis_jointuse)
VALUES (22, ..., DEFAULT);

-- skipping column
INSERT INTO tab(col1,...)
VALUES (22,...);

---

这些值在我用默认值设置的表中不为空。但是当我尝试插入时没有采用默认值。

据我所知，只有 Oracle 支持这样的构造：DEFAULT Values On Explicit NULLs

在上一节中，我们看到只有在插入语句中未引用列时才使用默认值。如果引用了该列，即使提供了 NULL 值，也不会使用默认值。 Oracle 12c 允许您使用默认定义中的 ON NULL 子句修改此行为。

CREATE TABLE t2 (
  col1        NUMBER DEFAULT 1,
  col2        NUMBER DEFAULT ON NULL 2, 
  description VARCHAR2(30)
);