Question

我的数据库中有以下表格定义

CREATE TABLE Products
  (
    PartNo      CHAR (6) NOT NULL ,
    Description VARCHAR2 (16) NOT NULL ,
    Weight      SMALLINT NOT NULL
  ) ;
ALTER TABLE Products ADD CONSTRAINT CK_PartNo CHECK ( PartNo LIKE '[0-9][A-Z][0-9][0-9][0-9][0-9]') ;
ALTER TABLE Products ADD CONSTRAINT Products_PK PRIMARY KEY ( PartNo ) ;

当我尝试插入一行时，出现不符合约束检查的错误。

insert into PRODUCTS(PARTNO, DESCRIPTION, WEIGHT)
values('1W1234', 'O-ring', 1);

*Action:   do not insert values that violate the constraint.
Error starting at line : 1 in command -
insert into PRODUCTS(PARTNO, DESCRIPTION, WEIGHT)
values('1W1234', 'O-ring', 1)
Error report -
SQL Error: ORA-02290: check constraint (DEMO.CK_PARTNO) violated
02290. 00000 -  "check constraint (%s.%s) violated"
*Cause:    The values being inserted do not satisfy the named check

Answer 1

ALTER TABLE Products ADD CONSTRAINT CK_PartNo 
  CHECK ( regexp_like(PartNo, '\d[A-Z]\d{4}') ) ;

Answer 2

您无法在LIKE中使用正则表达式语法，您需要使用REGEXP_LIKE：

CHECK ( REGEXP_LIKE(PARTNO, '[0-9][A-Z][0-9][0-9][0-9][0-9]')

演示：

CREATE TABLE Products
  (
    PartNo      CHAR (6) NOT NULL ,
    Description VARCHAR2 (16) NOT NULL ,
    Weight      SMALLINT NOT NULL
  ) ;
ALTER TABLE Products ADD CONSTRAINT CK_PartNo
  CHECK ( REGEXP_LIKE(PARTNO, '[0-9][A-Z][0-9][0-9][0-9][0-9]') ) ;
ALTER TABLE Products ADD CONSTRAINT Products_PK PRIMARY KEY ( PartNo ) ;

insert into PRODUCTS(PARTNO, DESCRIPTION, WEIGHT)
values('1W1234', 'O-ring', 1);

1 rows inserted.

无法使用约束将行插入表中

2 个答案: