使用seq和Trigger在Oracle中自动递增-无效的SQL语句 [英] Autoincrement in oracle with seq and trigger - invalid sql statement

问题描述

我是oracle的新手，来自MySQL，我试图通过序列和触发器使autoincrement在Oracle中工作，以便每次执行插入操作时，它都会使字段增加一个.

I am new to oracle, comming from MySQL, and I am trying to get autoincrement to work in Oracle with a sequence and a trigger, so that it increments my field by one, each time I do an insert.

CREATE SEQUENCE proposals_seq MINVALUE 1 
START WITH 1 INCREMENT BY 1 CACHE 10;

CREATE OR REPLACE TRIGGER proposals_before_insert
BEFORE INSERT
   ON proposals
   FOR EACH ROW
BEGIN
    SELECT proposals_seq.nextval INTO :new.proposal_id FROM dual;
END;

但是当我运行脚本时，出现错误:

But when I run the script, I get the error:

Error code 900, SQL state 42000: ORA-00900: invalid SQL statement

如果我删除;"在select语句之后，我没有任何错误，直到尝试将数据插入表中，然后才出现此错误:

If I remove the ";" after the select statement, I get no error, until I try to insert data into the table, then I get this error:

INSERT INTO proposals (target_audience, line_of_business, activity_description, cost, comments, objectives_and_results) 
    VALUES ('test', 'test', 'test', 15, 'test', 'test');

Error code 4098, SQL state 42000: ORA-04098: trigger 'PROPOSALS_BEFORE_INSERT' is invalid and failed re-validation

我正在使用此版本的Oracle: Oracle Database 11g企业版11.2.0.1.0版-64位生产

I am using this version of Oracle: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

我找到的所有关于它的文章似乎都是这样做的，并且也在这里回答:

All the articles I have found about it, seems to be doing it like this and answers in here aswell: How to create id with AUTO_INCREMENT on Oracle?

可能是由于我的Oracle版本引起的吗?我还有另一种方法可以自动增加此值吗?还是我必须按照我的sql中的顺序手动增加?

Can it be because of my version of Oracle? Is there another way for me to autoincrement this? Or will I have to increment manually with the sequence in my sql?

我的桌子看起来像这样:

My table looks like this:

CREATE TABLE proposals (
    proposal_id INT NOT NULL,
    target_audience VARCHAR2(50) NOT NULL,
    line_of_business VARCHAR2(50),
    activity_description VARCHAR2(250) NOT NULL,
    cost DECIMAL(19, 4) NOT NULL,
    comments VARCHAR2(250),
    objectives_and_results VARCHAR2(250),
    PRIMARY KEY (proposal_id)
);

推荐答案

我怀疑问题是您的客户端工具正在读取每个分号作为命令的结尾，从而导致PL/SQL代码(需要分号作为语句终止符)被错误地传输到服务器.

I suspect the problem is that your client tool is reading every semicolon as the end of a command, causing PL/SQL code (which requires semicolons as statement terminators) to be incorrectly transmitted to the server.

删除分号时，该语句已正确发送到服务器，但是由于PL/SQL错误，最终会导致对象无效.

When you remove the semicolon, the statement is correctly sent to the server, but you end up with an invalid object because the PL/SQL is incorrect.

我在SQL Fiddle上重复了您的问题.然后，我将语句终止符更改为/而不是;，并更改了代码以使用斜杠执行每个语句，并且它的工作没有错误:

I duplicated your problem on SQL Fiddle. Then I change the statement terminator to / instead of ; and changed the code to use a slash to execute each statement, and it worked without error:

CREATE TABLE proposals (
    proposal_id INT NOT NULL,
    target_audience VARCHAR2(50) NOT NULL,
    line_of_business VARCHAR2(50),
    activity_description VARCHAR2(250) NOT NULL,
    cost NUMBER(19, 4),
    comments VARCHAR2(250),
    objectives_and_results VARCHAR2(250),
    PRIMARY KEY (proposal_id)
)
/

CREATE SEQUENCE proposals_seq MINVALUE 1 
START WITH 1 INCREMENT BY 1 CACHE 10
/

CREATE OR REPLACE TRIGGER proposals_before_insert
BEFORE INSERT ON proposals FOR EACH ROW
BEGIN
    select proposals_seq.nextval into :new.proposal_id from dual;
END;
/

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