数据库设置的相关内容

文章 2016-03-05 来自：开发者社区

sql创建数据库、设置主键外键、插入记录

在数据库中创建一个玩具经销商订单录入系统。这些表用来完成下面几项任务：管理供应商管理产品目录管理顾客列表录入顾客订单一、供应商Vendors表 1.1表描述列说明 vend_id 唯一但供应商id vend_name 供应商名 vend_address 供应商地址 vend_city 供应商所在城市 vend_state ...

问答 2016-03-02 来自：开发者社区

设置数据库中的字符集问题

上面的sql语句中 collate 'utf8_general_ci'是什么意思？

问答 2016-02-15 来自：开发者社区

mysql每个数据库能否设置不同目录？

mysql默认将数据库建在data目录下对应的数据库名的文件夹之中，是否可以将数据库建在任意目录下？

问答 2016-02-11 来自：开发者社区

为什么数据库字段需要设置默认值

到别人设计的数据库一般都会设置默认值，比如username varchar(30) DEFAULT NULL,status tinyint(2) DEFAULT '0',不过，mysql数据库默认对varchar的字段的值不就是空（''）么，对数值默认是0，那还需要设置默认值的必要性何在？

问答 2016-02-07 来自：开发者社区

Mongodb数据库的管理页面RockMongo设置权限问题

请教各位大神一个问题，使用Mongodb的管理页面RockMongo，设置了用户名和密码，不过登录进去以后，可以删掉整个数据库，这样就比较危险了，有没有什么措施可以避免？

问答 2016-02-06 来自：开发者社区

mysql数据库中时间类型DATE需要设置长度么？外键ID用vachar存储长度设置多长合适呢？

问答 2016-02-06 来自：开发者社区

Select error: SQLSTATE = 22018MySQL[mysql-5.0.67-log]问题，很是郁闷，查了很多资料，说是mysql数据库与pb编码的问题，于是将mysql里的数据全都改成英文发现的却没有这个错误提示了，不过一些字符还是乱码，最终找到了解法，也是从php与mysql交互得到的灵感,即将pb中sqlca对象进行一些设置：在sqlca.dbparm="**"里加入;....

文章 2016-02-03 来自：开发者社区

Oracle数据库的可恢复性设置

整理自《Oracle 11g OCP/OCA 认证指南》 001 为了保证数据库的最大可恢复性，必须多路复用控制文件；必须多路复用联机重做日志；必须以归档日志模式运行数据库，并多路复用归档日志文件；最后必须作常规备份。 002 保护控制文件控制文件虽小，但很重要。它用于加载数据库，在数据库打开时，可不断地读和写控制文件。如果控制文件丢失了，...

问答 2016-02-01 来自：开发者社区

数据库表可以不设置主键吗？

我一位同事在设计数据库的时候没有设计主键，我们的需求是只保存数据到数据库，没有修改（偶然删除）。请问没有主键这种设计可以吗？对于系统有没有影响。

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