已解决在向有外键表插入数据提示“foreign key constraint fails”
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今天在做作业的时候,在建立了几个主表,一个有外键的表
USE SPJ;CREATE TABLE S (SNO CHAR(4) NOT NULL, SNAME CHAR(20) NOT NULL, STATUS CHAR(10), CITY CHAR(20), PRIMARY KEY (SNO));CREATE TABLE P (PNO CHAR(4) NOT NULL, PNAME CHAR(20) NOT NULL, COLOR CHAR(8), WEIGHT SMALLINT, PRIMARY KEY(PNO));CREATE TABLE J (JNO CHAR(4) NOT NULL, JNAME CHAR(20), CITY CHAR(20), PRIMARY KEY(JNO));CREATE TABLE SPJ (SNO CHAR(4) NOT NULL, PNO CHAR(4) NOT NULL, JNO CHAR(4) NOT NULL, QTY SMALLINT, PRIMARY KEY (SNO,PNO,JNO), CONSTRAINT `spj_ibfk_1` FOREIGN KEY (SNO) REFERENCES S(SNO) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `spj_ibfk_2` FOREIGN KEY (PNO) REFERENCES P(PNO) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `spj_ibfk_3` FOREIGN KEY (JNO) REFERENCES J(JNO) ON DELETE CASCADE ON UPDATE CASCADE);
生成了这几个表之后,在向SPJ表添加数据的时候就报错了,提示
“1452:INSERT INTO spj
.spj
(SNO
, PNO
, JNO
, QTY
) VALUES (‘S1’, ‘P2’, ‘J2’, ‘100’) 1452: Cannot add or update a child row: a foreign key constraint fails (spj
.spj
, CONSTRAINT spj_ibfk_1
FOREIGN KEY (SNO
) REFERENCES s
(SNO
)) ”
查了很多的资料都未果
但是当找到了这里:https://stackoverflow.com/questions/12966626/mysql-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails
里面的方法解决了这个问题
在INSERT代码段前面添加
SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT;SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS;SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION;SET NAMES utf8;SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO';SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0;
在代码段最后添加
SET SQL_MODE=@OLD_SQL_MODE;SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT;SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS;SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION;SET SQL_NOTES=@OLD_SQL_NOTES;
这样在执行insert操作就可以完美完成这个操作的任务
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