SQLite Autoincrement(自动递增)语法实例讲解

sqlite的autoincrement是一个关键字，用于表中的字段值自动递增。我们可以在创建表时在特定的列表名称上使用autoincrement关键字实现该字段值的自动增加。关键字 autoincrement只能用于整型(integer)字段。

语法

create table table_name(
   column1 integer autoincrement,
   column2 datatype,阿
   column3 datatype,
   .....
   columnn datatype,
);

实例

假设要创建的company表如下所示：

sqlite> create table company(
   id integer primary key   autoincrement,
   name           text      not null,
   age            int       not null,
   address        char(50),
   salary         real
);

现在，向company表插入以下记录：

insert into company (name,age,address,salary)
values ( 'paul', 32, 'california', 20000.00 );

insert into company (name,age,address,salary)
values ('allen', 25, 'texas', 15000.00 );

insert into company (name,age,address,salary)
values ('teddy', 23, 'norway', 20000.00 );

insert into company (name,age,address,salary)
values ( 'mark', 25, 'rich-mond ', 65000.00 );

insert into company (name,age,address,salary)
values ( 'david', 27, 'texas', 85000.00 );


insert into company (name,age,address,salary)
values ( 'kim', 22, 'south-hall', 45000.00 );

insert into company (name,age,address,salary)
values ( 'james', 24, 'houston', 10000.00 );

这将向company表插入7个元组，此时company表的记录如下：

id          name        age         address     salary
----------  ----------  ----------  ----------  ----------
1           paul        32          california  20000.0
2           allen       25          texas       15000.0
3           teddy       23          norway      20000.0
4           mark        25          rich-mond   65000.0
5           david       27          texas       85000.0
6           kim         22          south-hall  45000.0
7           james       24          houston     10000.0