MySQL的常见操作在这里先做一下总结,已经整合到代码里面,经过检验无误。
/*创建一个数据库*/
create database xuning_test;
/*说明当时使用数据库对象*/
use xuning_test;
/*向数据库中添加表并且定义表的结构*/
create table person(
id int not null,
name varchar(16) not null,
sex varchar(16) not null,
age int not null,
address varchar(128) not null,
remark varchar(512) not null
);
/*向数据库的表中插入数据*/
insert into person value
(1,\'name_1\',\'men\',99,\'beijing\',\'This is a frindsheep boy\'),
(2,\'name_2\',\'men\',88,\'shanghai\',\'ok great\'),
(1,\'name_3\',\'man\',77,\'guangzhou\',\'This is lickly\'),
(1,\'name_4\',\'men\',66,\'beijing\',\'This is a frindsheep boy\'),
(1,\'name_5\',\'men\',55,\'beijing\',\'you dont going to shool\'),
(1,\'name_6\',\'man\',44,\'beijing\',\'This is a frindsheep boy\'),
(1,\'name_7\',\'men\',33,\'beijing\',\'This is a frindsheep boy\'),
(1,\'name_8\',\'man\',22,\'beijing\',\'\'),
(1,\'name_9\',\'men\',11,\'beijing\',\'This is a frindsheep boy\')
;
/*查询时否成功插入*/
select * from person;
/*下面是多种查询方式*/
/*根据列的名称属性值*/
select name from person;
/*添加条件-根据性别*/
select name from person where sex = \'men\';
/*也可以用比较符作为条件--一定逗号隔开*/
select name,address from person where age > 50;
/*看做对象去使用数据库和表的关系=---双表关联--对象关系一定要明确*/
select xuning_test.person.name, xuning_test.person.id, xuning_test.person.age, xuning_test.person.address
from xuning_test.person, test1.test_xuning
where xuning_test.person.id = test1.test_xuning.id
;
/*使用表的别名进行查询*/
use xuning_test;
select c.name,sex from person as c where c.age > 40 and c.address=\'beijing\';