千锋逆战班，mysql小练习及jdbc的应用

mysql代码

# 创建用户表
CREATE TABLE `user`(userid INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(20) NOT NULL,`password` VARCHAR(18) NOT NULL,address VARCHAR(100),phone VARCHAR(11))CHARSET=utf8;#创建分类表CREATE TABLE category(cid VARCHAR(32) PRIMARY KEY,cname VARCHAR(100) NOT NULL)CHARSET=utf8;# 商品表
CREATE TABLE products(pid VARCHAR(32) PRIMARY KEY,`name` VARCHAR(40),price DOUBLE(7,2),category_id VARCHAR(32),CONSTRAINT FOREIGN KEY(category_id) REFERENCES category(cid))CHARSET=utf8;#订单表CREATE TABLE `order`(oid VARCHAR(32) PRIMARY KEY,totalprice DOUBLE(12,2),userid INT,CONSTRAINT FOREIGN KEY(userid) REFERENCES `user`(userid))CHARSET=utf8;# 订单项表
CREATE TABLE orderitem(oid VARCHAR(32),pid VARCHAR(32),num INT,PRIMARY KEY(oid,pid),FOREIGN KEY(oid) REFERENCES `order`(oid),FOREIGN KEY(pid) REFERENCES products(pid))CHARSET=utf8;#-----------------------------------------------
#初始化数据#用户表添加数据
INSERT INTO USER(username,PASSWORD,address,phone) VALUES('张三','123','北京昌平沙河','13812345678');
INSERT INTO USER(username,PASSWORD,address,phone) VALUES('王五','5678','北京海淀','13812345141');
INSERT INTO USER(username,PASSWORD,address,phone) VALUES('赵六','123','北京朝阳','13812340987');
INSERT INTO USER(username,PASSWORD,address,phone) VALUES('田七','123','北京大兴','13812345687');#给商品表初始化数据
INSERT INTO products(pid,`name`,price,category_id) VALUES('p001','联想',5000,'c001');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p002','海尔',3000,'c001');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p003','雷神',5000,'c001');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p004','JACK JONES',800,'c002');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p005','真维斯',200,'c002');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p006','花花公子',440,'c002');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p007','劲霸',2000,'c002');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p008','香奈儿',800,'c003');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p009','相宜本草',200,'c003');
INSERT INTO products(pid,`name`,price,category_id) VALUES('p010','梅明子',200,NULL);#给分类表初始化数据
INSERT INTO category VALUES('c001','电器');
INSERT INTO category VALUES('c002','服饰');
INSERT INTO category VALUES('c003','化妆品');
INSERT INTO category VALUES('c004','书籍');#添加订单
INSERT INTO `order` VALUES('o6100',18000.50,1);
INSERT INTO `order` VALUES('o6101',7200.35,1);
INSERT INTO `order` VALUES('o6102',600.00,2);
INSERT INTO `order` VALUES('o6103',1300.26,4);#订单详情表
INSERT INTO orderitem VALUES('o6100','p001',1),('o6100','p002',1),('o6101','p003',1);#1>查询所有用户的订单
SELECT * FROM `user` AS u INNER JOIN `order` AS o
ON u.`userid` = o.`userid` ;#2>查询用户id为 1 的所有订单详情
SELECT * FROM `user` AS u INNER JOIN `order` AS o
ON u.`userid`= o.`userid` INNER JOIN orderitem AS ad
ON o.`oid`=ad.`oid`#15.2 综合练习2-【子查询】#1>查看用户为张三的订单
SELECT * FROM (SELECT * FROM `user` WHERE username='张三') AS u INNER JOIN `order` AS o
ON u.`userid` = o.`userid`;#2>查询出订单的价格大于800的所有用户信息。
#方法1
SELECT * FROM (SELECT * FROM `order` AS o WHERE totalprice > 800) AS tt INNER JOIN `user` AS u
ON u.`userid` = tt.`userid`;
#方法2
SELECT * FROM `user` AS u INNER JOIN (SELECT * FROM `order` AS o WHERE totalprice > 800) AS o
ON u.`userid` = o.`userid`;#15.3 综合练习3-【分页查询】#1>查询所有订单信息，每页显示5条数据
SELECT * FROM `order` LIMIT 0,5;

jdbc 添加数据的代码，没有添加事务

package com.qf.day1.jdbc;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;public class TestjdbcDml {public static void main(String[] args) throws  Exception{Class.forName("com.mysql.jdbc.Driver");Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/compar?useUnicode=true&characterEncoding=utf8","root","740056981");//3.获取发送SQL语句的对象   StatementStatement sta = conn.createStatement();//增加，修改，删除用户String usql1 = "insert into user(username,password,address,phone) values('阿耀','123','山东省济南市','123456')";String usql2 = "update user set username = '阿军',passwprd = '456' where userid = 1";String usql3 = "delete from user where userid = 5";//增加，修改，删除商品分类String csql1 = "insert into category(cid,cname) values('c005','床上用品')";String csql2 = "update category set cname = '办公用品' where cid='c005'";String csql3 = "delete from catgory where cid = 'c005'";//增加，修改，删除商品String psql1 = "insert into products(pid,`name`,price,category_id) values('p011','黑豆',5555.55,'c004')";String psql2 = "update products set name = '大米' where pid = 'p011'";String psql3 = "delete from producats where pid = 'p011'";//增加，修改，删除订单String osql1 = "insert into `order`(oid,totalprice,userid) values('o6104',18000,2)";String osql2 = "update order set userid = 3 where oid = 'o6104'";String osql3 = "delete from order where oid = 'o6104'";//增加，修改，删除订单详情String oisql1 = "insert into orderitem(oid,pid,num) values('o6104','p011',2)";String oisql2 = "update orderitem set num = 3 where oid = 'o6104'";String oisql3 = "delete from orderitem where oid = 'o6104'and pid='p011'";int user1 = sta.executeUpdate(usql1);//增加一个用户if (user1 > 0){System.out.println("用户新增成功");}else {System.out.println("用户新增失败");}int catgroy1 = sta.executeUpdate(csql1);//增加一个商品分类if ( catgroy1 > 0){System.out.println("商品分类新增成功");}else {System.out.println("商品分类新增失败");}int products1 = sta.executeUpdate(psql1);//增加一个商品信息if (products1 > 0){System.out.println("商品新增成功");}else {System.out.println("商品新增失败");}int order1 = sta.executeUpdate(osql1);//增加一个订单信息if ( order1 > 0 ){System.out.println("订单新增成功");}else {System.out.println("订单新增失败");}int orderitem1 = sta.executeUpdate(oisql1);//增加一个订单详情信息if (orderitem1 > 0){System.out.println("订单详情新增成功");}else {System.out.println("订单详情新增失败");}sta.close();conn.close();}
}

jdbc 修改数据代码，有事务的

package com.qf.day1.jdbc;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;public class TestUpdate {public static void main(String[] args) throws  Exception{Class.forName("com.mysql.jdbc.Driver");//1.启动驱动//2.设置数据库连接，用户名，密码 链接数据库Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/compar?useUnicode=true&characterEncoding=utf8","root","740056981");//3.获取发送SQL语句的对象   StatementStatement sta = conn.createStatement();//增加，修改，删除用户String usql1 = "insert into user(username,password,address,phone) values('阿耀','123','山东省济南市','123456')";String usql2 = "update user set username = '阿军',password = '456' where userid = 9";String usql3 = "delete from user where userid = 5";//增加，修改，删除商品分类String csql1 = "insert into category(cid,cname) values('c005','床上用品')";String csql2 = "update category set cname = '办公用品' where cid='c005'";String csql3 = "delete from catgory where cid = 'c005'";//增加，修改，删除商品String psql1 = "insert into products(pid,`name`,price,category_id) values('p011','黑豆',5555.55,'c004')";String psql2 = "update products set `name` = '大米' where pid = 'p011'";String psql3 = "delete from producats where pid = 'p011'";//增加，修改，删除订单String osql1 = "insert into `order`(oid,totalprice,userid) values('o6104',18000,2)";String osql2 = "update `order` set userid = 3 where oid = 'o6104'";String osql3 = "delete from order where oid = 'o6104'";//增加，修改，删除订单详情String oisql1 = "insert into orderitem(oid,pid,num) values('o6104','p011',2)";String oisql2 = "update orderitem set num = 3 where oid = 'o6104'";String oisql3 = "delete from orderitem where oid = 'o6104'and pid='p011'";try {conn.setAutoCommit(false);//关闭自动提交int user1 = sta.executeUpdate(usql2);//修改一个用户int catgroy1 = sta.executeUpdate(csql2);//修改一个商品分类int products1 = sta.executeUpdate(psql2);//修改一个商品信息int order1 = sta.executeUpdate(osql2);//修改一个订单信息int orderitem1 = sta.executeUpdate(oisql2);//修改一个订单详情信息//上述语句执行无异常我们，提交conn.commit();//手动提交System.out.println("修改成功");} catch(Exception e){System.out.println("修改失败，回滚了");conn.rollback();//回滚e.printStackTrace();}finally {//释放资源sta.close();conn.close();}}
}

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