table of Contents

Affairs

basic concepts

Transaction: Transaction
A transaction is a logical unit of one or more sql statement constituted, is an overall concept
Role : make a series of sql statements either completed ISSUE not all completed, to ensure the integrity of the database

Four properties (ACID)

Atomicity ( A tomicity): A transaction is the smallest unit of execution can not be divided, either all of the operations of a transaction, either completed or not completed all
Consistency ( C onsistency): the transaction before the start and after the end of the integrity of the database is not corrupted
Isolation ( the I solation): Support for multiple database transaction concurrency, inconsistent transaction isolation can be prevented due to the implementation of the cross
- Uncommitted Read
- READ COMMITTED
- Repeatable read
- Serialization
Persistent ( D urability): After completion of the transaction, when the data changes permanent

Instructions

start transaction; Open
commit; submit
rollback; Rollback

The first step: Turn on the transaction, perform the operation

# alpha 对 bravo 转账 100
mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |  1000 |
|  2 | bravo |  1000 |
+----+-------+-------+
2 rows in set (0.00 sec)

# 开启事务
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)

mysql> update balance set money=1000-100 where name='alpha';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update balance set money=1000+100 where name='bravo';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |   900 |
|  2 | bravo |  1100 |
+----+-------+-------+
2 rows in set (0.00 sec)

Step Two: At this point we have not submitted something, we open a new window, look at the balance sheet

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |  1000 |
|  2 | bravo |  1000 |
+----+-------+-------+
2 rows in set (0.00 sec)

The third step: Then we submitted thing

mysql> commit;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |   900 |
|  2 | bravo |  1100 |
+----+-------+-------+
2 rows in set (0.00 sec)

Step 4: Check balance sheet in a new window, data modification success

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |   900 |
|  2 | bravo |  1100 |
+----+-------+-------+
2 rows in set (0.00 sec)

If we do not commit, rollback, about the time the transaction in the third step

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |  1000 |
|  2 | bravo |  1000 |
+----+-------+-------+
2 rows in set (0.00 sec)

# 开启事务
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)


mysql> update balance set money=1000-100 where name='alpha';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update balance set money=1000+100 where name='bravo';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |   900 |
|  2 | bravo |  1100 |
+----+-------+-------+
2 rows in set (0.00 sec)

# 回滚事务
mysql> rollback;
Query OK, 0 rows affected (0.01 sec)

# 数据没有被修改
mysql> select * from balance;
+----+-------+-------+
| id | name  | money |
+----+-------+-------+
|  1 | alpha |  1000 |
|  2 | bravo |  1000 |
+----+-------+-------+
2 rows in set (0.00 sec)

Storage Engine

InnoDB (MySQL by default)
MyISAM (My Assam?)
the difference
- InnoDB supports transactions
- InnoDB supports row locks (concurrent), MyISAM only supports table locks

view

basic concepts

select query dynamic data sets obtained having a name based on, as long as the user can view acquired by the data set name

Instructions

Increase views create view 视图名 as select查询语句
Use view (equivalent to a table) select * from 视图名
Delete View drop view 视图名

mysql> select * from user_info;
+----+---------+----------+
| id | name    | password |
+----+---------+----------+
|  1 | bigb    | 111111   |
|  2 | blake   | 222222   |
|  3 | black   | 333333   |
|  4 | alpha   | 111111   |
|  5 | bravo   | 222222   |
|  6 | charlie | 333333   |
|  7 | delta   | 111111   |
|  8 | echo    | 222222   |
|  9 | foxtrot | 333333   |
+----+---------+----------+
9 rows in set (0.00 sec)

mysql> select * from user_info where name='alpha';
+----+-------+----------+
| id | name  | password |
+----+-------+----------+
|  4 | alpha | 111111   |
+----+-------+----------+
1 row in set (0.00 sec)

# 创建视图
mysql> create view v1 as select * from user_info where name='alpha';
Query OK, 0 rows affected (0.01 sec)

# 使用视图
mysql> select * from v1;
+----+-------+----------+
| id | name  | password |
+----+-------+----------+
|  4 | alpha | 111111   |
+----+-------+----------+
1 row in set (0.00 sec)

# 如果我们对原表记录进行了修改, 发现视图中的数据也进行了相应的修改, 因此通过视图得到是一个动态的数据集
mysql> update user_info set password='888888' where name='alpha';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from v1;
+----+-------+----------+
| id | name  | password |
+----+-------+----------+
|  4 | alpha | 888888   |
+----+-------+----------+
1 row in set (0.00 sec)

# 删除视图
mysql> drop view v1;
Query OK, 0 rows affected (0.00 sec)

trigger

basic concepts

Trigger certain operations on the table 2 of Table 1 when certain operations

Instructions

Creating Triggers

delimiter 结束符号(自定义)
create trigger 触发器名 before/after 触发事件 on 表名 for each row
begin
触发器触发的内容;
end 结束符号

delimiter;  # 将结束符号改回;

Example: When adding records to achieve t1, t2 add a record to

# t1 和 t2 为两个空表
mysql> select * from t1;
Empty set (0.00 sec)

mysql> select * from t2;
Empty set (0.00 sec)

# 创建触发器
mysql> delimiter //
mysql> create trigger tri_nb after insert on t1 for each row
    -> begin
    -> insert into t2 (name) values ('bravo');
    -> end //
Query OK, 0 rows affected (0.01 sec)

mysql> delimiter ;

# 对 t1 进行操作
mysql> insert into t1 (name) values ('alpha');
Query OK, 1 row affected (0.01 sec)

mysql> select * from t1;
+----+-------+
| id | name  |
+----+-------+
|  1 | alpha |
+----+-------+
1 row in set (0.00 sec)

mysql> select * from t2;
+----+-------+
| id | name  |
+----+-------+
|  1 | bravo |
+----+-------+
1 row in set (0.00 sec)

Stored Procedures

basic concepts

Sql statement on the package, to facilitate post called, is equivalent function in MySQL

Instructions

create

delimiter 结束符号

create procedure p1(IN 参数 int)  # IN表示传入参数, 参数类型为int
begin
sql语句;
end 结束符号

delimiter 结束符号

use
- call p1(参数);
delete
- drop procedure p1;
example

+----+---------+----------+
| id | name    | password |
+----+---------+----------+
|  1 | bigb    | 111111   |
|  2 | blake   | 222222   |
|  3 | black   | 333333   |
|  4 | alpha   | 888888   |
|  5 | bravo   | 222222   |
|  6 | charlie | 333333   |
|  7 | delta   | 111111   |
|  8 | echo    | 222222   |
|  9 | foxtrot | 333333   |
+----+---------+----------+

# 创建
mysql> delimiter //

mysql> create procedure p1(IN p_in int)
    ->  begin
    ->  select * from user_info where id = p_in;
    ->  end //
Query OK, 0 rows affected (0.01 sec)

mysql> delimiter ;

# 调用
mysql> call p1(3);
+----+-------+----------+
| id | name  | password |
+----+-------+----------+
|  3 | black | 333333   |
+----+-------+---------+
1 row in set (0.00 sec)

data backup

Backup

Single database backup
- mysqldump -u用户名 -p密码数据库名 > 备份文件.sql
- mysqldump -u用户名 -p密码数据库名表1 表2 > 备份文件.sql The following table database backup
Multi-database backup mysqldump -u用户名 -p密码 --databases 数据库1 数据库2 > 备份文件.sql
Back up all mysqldump -u用户名 -p密码 --all-databases > 备份文件.sql

Importing

source D:\all.sql

MySQL 05

Affairs

basic concepts

Four properties (ACID)

Instructions

Storage Engine

view

basic concepts

Instructions

trigger

basic concepts

Instructions

Stored Procedures

basic concepts

Instructions

data backup

Backup

Importing

function

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