- /*创建数据库*/
CREATE DATABASE `mybank`;
/*创建表*/
USE mybank;
CREATE TABLE `bank`(
`customerName` CHAR(10), #用户名
`currentMoney` DECIMAL(10,2) #当前余额
);
/*插入数据*/
INSERT INTO `bank` (`customerName`,`currentMoney`) VALUES (‘张三‘,1000);
INSERT INTO `bank` (`customerName`,`currentMoney`) VALUES (‘李四‘,1);
2. --转账测试:张三希望通过转账,直接汇钱给李四500元
UPDATE `bank` SET `currentMoney` =`currentMoney`-500
WHERE `customerName` = ‘张三‘;
UPDATE `bank` SET `currentMoney` =`currentMoney`+500
WHERE `customerName` = ‘李四‘;
3. 执行事务 并提交事务
USE mybank;
/*设置结果集以gbk编码格式显示*/
SET NAMES gbk;
/*开始事务*/
BEGIN;
UPDATE `bank` SET `currentMoney` =`currentMoney`-500
WHERE `customerName` = ‘张三‘;
UPDATE `bank` SET `currentMoney` =`currentMoney`+500
WHERE `customerName` = ‘李四‘;
COMMIT; #提交事务,写入硬盘
4. 开始事务 回滚事务
BEGIN;
UPDATE `bank` SET `currentMoney` = `currentMoney` -1000 WHERE `customerName` = ‘张三‘;
/*回滚*/
ROLLBACK;
5.设置自动提交关闭或开启
/*关闭事务自动提交*/
SET autocommit = 0;
/*转账*/
UPDATE `bank` SET `currentMoney` =`currentMoney`-500
WHERE `customerName` = ‘张三‘;
UPDATE `bank` SET `currentMoney` =`currentMoney`+500
WHERE `customerName` = ‘李四‘;
/*提交*/
COMMIT;
UPDATE `bank` SET `currentMoney` = `currentMoney` -1000 WHERE `customerName` = ‘张三‘;
/*回滚事务*/
ROLLBACK;
6. 创建视图
/*当前数据库*/
USE myschool;
DROP VIEW IF EXISTS `view_student_result`;
/*创建视图*/
CREATE VIEW `view_student_result`
AS
/*需要创建视图的数据*/
SELECT `studentName` AS 姓名,student.`studentNo` 学号,`studentResult` AS 成绩,`subjectName` AS 课程名称.`examDate` AS 考试日期
FROM `student`
INNER JOIN `result` ON `student`.`studentNo` = `result`.`studentNo`
INNER JOIN `subject` ON `result`.`subjectNo` = `subject`.`studentNo`
WHERE `subject`.`subjectNo`=(
SELECT `subjectNo` FROM `subject` WHERE `subjectName` = ‘Logic Java‘
)AND `examDate` =(
SELECT MAX(`examDate`) FROM `result`.`subject` WHERE `result`.`subjectNo` = `subject`.`subjectNo`
AND `subjectName` = ‘Logic Java‘
);
7. 创建索引
USE myschool;
/*创建索引*/
CREATE INDEX `index_student_studentName`
ON `student`(`studentName`);
8. 使用DOS命令备份数据库
mysqldump -u username -h -ppassword
dbname[tbname1 [,tbname2]........] > filename.sql
例:
mysqldump -u root -p myschool student > d:\backup\myschool.sql
EnterPassword:
9. 使用后DOS命令恢复数据库
1) .恢复数据库前先在MySQL服务器中创建新的数据库.
2). 执行 mysql -u username -p [dbname] <filename.sql
例:
mysql -u root -p schoolDB < d:\backup\myschool.sql
10. 使用source命令恢复数据库
语法: source filename;
例:
/*创建数据库*/
CREATE DATABASE myschoolDB2;
USE myschoolDB2;
/*恢复数据库*/
source ‘d:\backup\myschool.sql‘;
11. 将表数据导出到文本文件
语法: select 列名 from 表名 [where 条件,条件2......]
into outfile ‘filename‘ ;
例:
SELECT * FROM `result` WHERE `subjectNo` =
(SELECT `subjectNo` FROM `subject` WHERE `subjectName` = ‘Logic Java‘)
INTO OUTFILE ‘d: /backup/result.txt‘;
12. 将文本文件导入到数据表
语法: LOAD DATA INFILE ‘filename‘ INTO TABLE ‘tablename ‘;
1) . 先创建导入数据的表结构
USE myschoolDB2;
/*创建result表结构*/
CREATE TABLE `result`
(
`studentNo` INT(4) NOT NULL COMMENT ‘学号‘,
`subjectNo` INT(4) NOT NULL COMMENT ‘课程编号‘,
`examDate` DATETIME NOT NULL COMMENT ‘考试日期‘,
`studentResult` INT(4) NOT NULL COMMENT ‘考试成绩‘,
PRIMARY KEY (`studentNo`,`subjectNo`,`examDate`)
)ENGINE = INNODB DEFAULT CHARSET utf8;
2).导入数据
LOAD DATA INFILE ‘路径.txt‘ INTO TABLE result;
/*查看result表数据*/
SELECT * FROM result;