达梦数据库如何设置自增主键的方法及注意事项

CREATE SEQUENCE your_sequence_name  
START WITH 1  
INCREMENT BY 1  
NOCACHE;

CREATE OR REPLACE TRIGGER your_trigger_name  
BEFORE INSERT ON your_table_name  
FOR EACH ROW  
BEGIN  
    IF :NEW.id IS NULL THEN -- 假设id是自增字段  
        SELECT your_sequence_name.NEXTVAL INTO :NEW.id FROM DUAL;  
    END IF;  
END;

CREATE SEQUENCE seq_u_operation_log_id  
START WITH 1  
INCREMENT BY 1  
NOCACHE;

CREATE TABLE HSZ_PRODUCT_UCENTER.U_OPERATION_LOG (
	ID BIGINT NOT NULL,
	OPERATION VARCHAR(50),
	REQUEST_URI VARCHAR(255),
	REQUEST_METHOD VARCHAR(20),
	REQUEST_PARAMS CLOB,
	USER_AGENT VARCHAR(500),
	CREATOR_NAME VARCHAR(50),
	OPERATION_TIME TIMESTAMP,
	REQUEST_IP VARCHAR(100),
	REQUEST_TIME BIGINT,
	REQUEST_STATUS TINYINT,
	REQUEST_RESULT CLOB,
	PRIMARY KEY (ID)
);

CREATE OR REPLACE TRIGGER trg_u_operation_log_before_insert  
BEFORE INSERT ON U_OPERATION_LOG  
FOR EACH ROW  
BEGIN  
    IF NEW.id IS NULL OR NEW.id = 0 THEN   
        SELECT seq_u_operation_log_id.NEXTVAL INTO :NEW.id FROM DUAL;  
    END IF;  
END;