Oracle中实现一次插入多条数据
一、需求形貌在我们现实的业务场景中，由于单条插入的效率很低（每次都需要数据库资源毗连关闭的开销），故需要实现一次性插入多条数据，用以提拔数据插入的效率；
如下图是常见的单条插入数据：
https://img-blog.csdnimg.cn/direct/d02db84b906b49b191b77b1ee3151b76.png
二、Oracle实现一次插入多条数据
我这里以grade2表为例举行演示说明：
https://img-blog.csdnimg.cn/direct/5416957bcede42ff8a232b36306ec6d1.png
2.1、union all拼接查询
采用union all拼接查询方式实现一次向同一个表中插入多条数据语法：
INSERT into 表名(字段名1,字段名2,字段名3,...)
SELECT 值1,值2,值3,... from dual
union all SELECT 值11,值21,值31,... from dual
union all SELECT 值12,值22,值32,... from dual
... 示例（向同一个表同时插入6条不同内容的数据）：
INSERT into "grade2"("name","chinese","math","english")
SELECT '张10',100,100,100 from dual
union all SELECT '张20',101,101,101 from dual
union all SELECT '张30',102,102,102 from dual
union all SELECT '张40',103,103,103 from dual
union all SELECT '张50',104,104,104 from dual
union all SELECT '张60',105,105,105 from dual
https://img-blog.csdnimg.cn/direct/2e9b548597f640da954ca2a2c69751ef.png
2.2、insert all插入
采用insert all方式实现一次向同一个表中插入多条数据语法：
insert all
into 表名(字段名1,字段名2,字段名3,...) VALUES(值1,值2,值3,...)
into 表名(字段名1,字段名2,字段名3,...) VALUES(值11,值21,值31,...)
into 表名(字段名1,字段名2,字段名3,...) VALUES(值12,值22,值32,...)
...
SELECT * from dual; 示例（向同一个表同时插入6条不同内容的数据）：
insert all
into "grade2"("name","chinese","math","english") VALUES('张11',100,100,100)
into "grade2"("name","chinese","math","english") VALUES('张21',101,101,101)
into "grade2"("name","chinese","math","english") VALUES('张31',102,102,102)
into "grade2"("name","chinese","math","english") VALUES('张41',103,103,103)
into "grade2"("name","chinese","math","english") VALUES('张51',104,104,104)
into "grade2"("name","chinese","math","english") VALUES('张61',105,105,105)
SELECT * from dual; https://img-blog.csdnimg.cn/direct/f812646bb6384fec87f284c4d9afb343.png
insert all方式实现一次向多个表中插入多条数据语法：
insert all
into 表名1(字段名1,字段名2,字段名3,...) VALUES(值1,值2,值3,...)
into 表名1(字段名1,字段名2,字段名3,...) VALUES(值11,值21,值31,...)
into 表名1(字段名1,字段名2,字段名3,...) VALUES(值12,值22,值32,...)
into 表名2(字段名1,字段名2,字段名3,...) VALUES(值1,值2,值3,...)
into 表名2(字段名1,字段名2,字段名3,...) VALUES(值11,值21,值31,...)
into 表名2(字段名1,字段名2,字段名3,...) VALUES(值12,值22,值32,...)
into 表名3(字段名1,字段名2,字段名3,...) VALUES(值1,值2,值3,...)
into 表名3(字段名1,字段名2,字段名3,...) VALUES(值11,值21,值31,...)
into 表名3(字段名1,字段名2,字段名3,...) VALUES(值12,值22,值32,...)
...
SELECT * from dual; 示例（向多个表同时插入6条不同内容的数据）：
insert all
into "grade2"("name","chinese","math","english") VALUES('张11',100,100,100)
into "grade2"("name","chinese","math","english") VALUES('张21',101,101,101)
into "grade2"("name","chinese","math","english") VALUES('张31',102,102,102)
into "grade"("id","name","course","score","sex","age") VALUES(11,'张11','语文',100,'男',26)
into "grade"("id","name","course","score","sex","age") VALUES(12,'张21','数学',100,'男',26)
into "grade"("id","name","course","score","sex","age") VALUES(13,'张31','英语',100,'男',26)
SELECT * from dual;
https://img-blog.csdnimg.cn/direct/c950f88aa326416da8a3c785b0631212.png
注意：insert all语句里不能直接使用序列生成的值（因为即便每个into语句里都加上seq_test_insert.nextval也不会得到多个值）：
-- 创建序列
create sequence seq_test_insert
minvalue 1
maxvalue 999999999999999999999999
start with 1
increment by 1
cache 20;
-- 获取下一个序列值
SELECT seq_test_insert.nextval from dual; https://img-blog.csdnimg.cn/direct/ec3eab00ed5c4243986e3b86c6a55660.png
免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！更多信息从访问主页：qidao123.com:ToB企服之家，中国第一个企服评测及商务社交产业平台。
页:
[1]