sqlite
資料庫(kù);使用;嵌入式關(guān)聯(lián)式資料庫(kù)
#autoincrement
##Swe[?:'t??nkr?m?nt]美[?:'t??nkr?m?nt]??n.自動(dòng)增量
SQLite Autoincrement函數(shù) 語(yǔ)法
作用：SQLite 的?AUTOINCREMENT?是一個(gè)關(guān)鍵字，用於表格中的欄位值會(huì)自動(dòng)遞增。我們可以在建立表格時(shí)在特定的列名稱上使用?AUTOINCREMENT?關(guān)鍵字實(shí)現(xiàn)該欄位值的自動(dòng)增加。關(guān)鍵字?AUTOINCREMENT?只能用於整數(shù)（INTEGER）欄位。
語(yǔ)法：AUTOINCREMENT?關(guān)鍵字的基本使用如下：
CREATE?TABLE?table_name(
???column1?INTEGER?AUTOINCREMENT,
???column1?INTEGER?AUTOINCREMENT,
???column1?INTEGER?AUTOINCREMENT,
??#???column3?datatype,
???.....
???columnN?datatype,
SQLite Autoincrement函數(shù) 範(fàn)例
創(chuàng)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
);
現(xiàn)在，向 COMPANY 表插入以下記錄：
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 );
這將向 COMPANY 表插入 7 個(gè)元組，此時(shí) COMPANY 表的記錄如下：
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