MySQL的每个数据库都对应存放在一个与数据库同名的文件夹中,MySQL数据库文件包括MySQL(server)所建数据库文件和MySQL(server)所用存储引擎创建的数据库文件。
.frm文件:存储数据表的框架结构,文件名与表名相同,每个表对应一个同名frm文件,与操作系统和存储引擎无关,即不管MySQL运行在何种操作系统上,使用何种存储引擎,都有这个文件。 MySQL Server 5.1data
InnoDB数据库文件(即InnoDB文件集,ib-file set):
ibdata1、ibdata2等:系统表空间文件,存储InnoDB系统信息和用户数据库表数据和索引,所有表共用
.ibd文件:单表表空间文件,每个表使用一个表空间文件(file per table),存放用户数据库表数据和索引
日志文件: ib_logfile1、ib_logfile2
查看数据库本地存储位置: show variables like '%datadir%';
.myini配置文件
mysql5.0以上版本支持三种sql_mode模式:ANSI、TRADITIONAL和STRICT_TRANS_TABLES。-----------------show variables like '%datadir%';
ANSI模式:
mysql> set @@sql_mode=ANSI; Query OK, 0 rows affected (0.00 sec) mysql> create table test(name varchar(4), pass varchar(4)); Query OK, 0 rows affected (0.03 sec) mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb'); Query OK, 2 rows affected, 2 warnings (0.02 sec) Records: 2 Duplicates: 0 Warnings: 2 mysql> show warnings; +---------+------+-------------------------------------------+ | Level | Code | Message | +---------+------+-------------------------------------------+ | Warning | 1265 | Data truncated for column 'name' at row 1 | | Warning | 1265 | Data truncated for column 'pass' at row 1 | +---------+------+-------------------------------------------+ 2 rows in set (0.00 sec) mysql> select * from test; +------+------+ | name | pass | +------+------+ | aaaa | aaaa | | bbbb | bbbb | +------+------+ 2 rows in set (0.00 sec)
STRICT_TRANS_TABLES模式:
mysql> set @@sql_mode=STRICT_TRANS_TABLES; Query OK, 0 rows affected (0.00 sec) mysql> create table test(name varchar(4), pass varchar(4)); Query OK, 0 rows affected (0.02 sec) mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb'); ERROR 1406 (22001): Data too long for column 'name' at row 1 mysql> show errors; +-------+------+------------------------------------------+ | Level | Code | Message | +-------+------+------------------------------------------+ | Error | 1406 | Data too long for column 'name' at row 1 | +-------+------+------------------------------------------+ 1 row in set (0.00 sec) mysql> select * from test; Empty set (0.00 sec)
TRADITIONAL模式:
mysql> set @@sql_mode=TRADITIONAL; Query OK, 0 rows affected (0.00 sec) mysql> create table test(name varchar(4), pass varchar(4)); Query OK, 0 rows affected (0.02 sec) mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb'); ERROR 1406 (22001): Data too long for column 'name' at row 1 mysql> show errors; +-------+------+------------------------------------------+ | Level | Code | Message | +-------+------+------------------------------------------+ | Error | 1406 | Data too long for column 'name' at row 1 | +-------+------+------------------------------------------+ 1 row in set (0.00 sec) mysql> select * from test; Empty set (0.00 sec)