Question

我无法从PostGres DB的父表中删除记录。你们中的任何一个都可以让我对此有所了解。

-- Table: tbl_patient

-- DROP TABLE tbl_patient;

CREATE TABLE tbl_patient
(
 patient_id bigserial NOT NULL,
 date_of_birth date NOT NULL,
 fathers_name character varying(255) NOT NULL,
 first_name character varying(255) NOT NULL,
 last_name character varying(255),
 marital_status character varying(255),
 mobile_number character varying(255) NOT NULL,
 occupation character varying(255),
 phone_number character varying(255),
 pregnancy_status character varying(255),
 sex character varying(255) NOT NULL,
 CONSTRAINT tbl_patient_pkey PRIMARY KEY (patient_id)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE tbl_patient
OWNER TO postgres;


-- Table: tbl_address

CREATE TABLE tbl_address
(
 address_id bigserial NOT NULL,
 address_line_1 character varying(255) NOT NULL,
 address_line_2 character varying(255),
 city character varying(255),
 country character varying(255),
 district character varying(255) NOT NULL,
 pincode character varying(255) NOT NULL,
 state character varying(255),
 street character varying(255),
 patient_id bigint,
 CONSTRAINT tbl_address_pkey PRIMARY KEY (address_id),
 CONSTRAINT fk_slc6pgeimmox5buka8bydy6c4 FOREIGN KEY (patient_id)
  REFERENCES tbl_patient (patient_id) MATCH SIMPLE
  ON UPDATE NO ACTION ON DELETE NO ACTION
 )
 WITH (
  OIDS=FALSE
 );
 ALTER TABLE tbl_address
   OWNER TO postgres;

// --------------------------------------------- ----------------------

当我输入此命令时

 DELETE FROM tbl_patient
  WHERE patient_id = 1;

我在下面遇到此错误

错误：表“tbl_patient”上的更新或删除违反了外键表“tbl_address”SQL上的约束“fk_slc6pgeimmox5buka8bydy6c4” 状态：23503详细信息：Key（patient_id）=（1）仍被引用表“tbl_address”。

Answer 1

你写DELETE NO ACTION，你想要行动:)只需要改为

    REFERENCES tbl_patient (patient_id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE CASCADE

NO ACTION表示服务器不会对引用的行（如果存在）执行任何操作。由于它们存在并且您还将MATCH SIMPLE指定为一列外键，因此PostgreSQL无法执行删除，因为该引用的行。

级联删除不起作用

1 个答案: