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Oracle primary key auto increment

2022-07-02 15:22:00 【SherlockerSun】

Oracle The primary key increases automatically

1、 Build table

       
        CREATE TABLE TEST_TABLE
        
(
        
  ID INT NOT NULL,
        
  NAME VARCHAR2(40) NULL,
        
  AGE VARCHAR2(40) NULL
        
);
       
       
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Oracle The primary key increases automatically _ Build table

2、 Set primary key

       
        ALTER TABLE TEST_TABLE ADD CONSTRAINT TEST_TABLE_PK PRIMARY KEY (ID);
       
       
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Oracle The primary key increases automatically _oracle_02

3、 New sequence

       
        CREATE SEQUENCE TEST_TABLE_AUTOINC_SEQ
        
MINVALUE 1
        
NOMAXVALUE
        
INCREMENT BY 1
        
START WITH 1
        
NOCACHE;
       
       
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Oracle The primary key increases automatically _oracle_03

4、 New trigger

       
        CREATE OR REPLACE TRIGGER  TEST_TABLE_AUTOINC_TG
        
BEFORE INSERT ON TEST_TABLE FOR EACH ROW 
        
BEGIN
        
  SELECT TEST_TABLE_AUTOINC_SEQ.NEXTVAL INTO:NEW.ID FROM DUAL;
        
END;
       
       
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Oracle The primary key increases automatically _oracle_04

5、 test

       
        INSERT INTO TEST_TABLE (NAME,AGE)VALUES(' test 1','18');
        
INSERT INTO TEST_TABLE (NAME,AGE)VALUES(' test 2','19');
        
INSERT INTO TEST_TABLE (NAME,AGE)VALUES(' test 3','20');
       
       
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Oracle The primary key increases automatically _oracle_05

6、 result

       
        SELECT * FROM TEST_TABLE;
       
       
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Oracle The primary key increases automatically _ Primary key _06

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