Oracle--Sequence

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序列是oracle特有一个对象，用于产生一系列不重复的数字。

创建序列

• create sequence 序列名
  increment by 1 start with 1
  nomaxvalue minvalue 1;

删除序列

• drop sequence 序列名;

使用Oracle序列

• 序列.nextval  --生成并返回下一个值

• 序列.currval    --返回当前序列值

 

create table t_dept9(

nid number(18) primary key, --部门编号

sname varchar2(30), --部门名称

sdes varchar2(2000) --部门描述

);

create sequence seq_t_dept9 increment by 1 start with 1 nomaxvalue minvalue 1;

insert into t_dept9(nid,sname) values (seq_t_dept9.nextval,’开发部’);

insert into t_dept9(nid,sname) values (seq_t_dept9.nextval,’设计部’);

insert into t_dept9(nid,sname) values (seq_t_dept9.nextval,’实施部’);

 

-- 创建一个名为SY_NOTE_SALES_INFO_ID的sequence

CREATESEQUENCEECOLOGY.SY_NOTE_SALES_INFO_ID

  STARTWITH1

  MAXVALUE999999999999999999999999999

  MINVALUE1

  NOCYCLE

  CACHE20

  NOORDER;

 

-- Create sequence
create sequence SEQ_CDH_NEWRBT_SET
minvalue 100000
maxvalue 999999999
start with 100000
increment by 1
cache 20;

// jdbc调用sequence

public long getNextSequenceValue(String sequenceName){
        return getJdbcTemplate().queryForLong("select " + sequenceName + ".NEXTVAL from dual");
}

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-- Create sequence
create sequence SEQ_CDH_NEWRBT_SET
minvalue 100000
maxvalue 999999999
start with 100000
increment by 1
cache 20;

// jdbc调用sequence

public long getNextSequenceValue(String sequenceName){
        return getJdbcTemplate().queryForLong("select " + sequenceName + ".NEXTVAL from dual");
}

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