我有一个要求,我必须采取只有一列表的mysql转储.由于该表有太多列,我不想转储整个表.我必须将表的转储从一个服务器转移到另一个服务器.知道我怎么能这样做吗？
我正在尝试在Snow Leopard上安装MySQL5,但我遇到了一些麻烦.这是我的终端日志:
users-MacBook-Pro:~ sam$ sudo port install mysql5Password:
---> Computing dependencies for mysql5
---> Fetching mysql5
---> Verifying checksum(s) for mysql5
---> Extracting mysql5
---> Applying patches to mysql5
---> Configuring mysql5
---> Building mysql5
---> Staging mysql5 into destroot
---> Installing mysql5 @5.1.53_0
The MySQL client has been installed.
If you also want a MySQL server, install the mysql5-server port.
---> Activating mysql5 @5.1.53_0
---> Cleaning mysql5
users-MacBook-Pro:~ sam$ sudo port install mysql5-server
Password:
---> Computing dependencies for mysql5-server …我需要对MySQL5服务器上所有数据库中的所有表进行修复,因为我已经更新了MySQL全文搜索停用词文件.
我可以运行查询或命令来执行此操作吗？
我需要使用mysql查询将所有双引号替换为单引号.
我怎样才能做到这一点.我的sql应该是双引号.
mysql="select replace(text,'\"',''') from mytable"
投掷错误.如何在查询中转义单引号？
我的SQL架构是
CREATE TABLE Foo (
`bar` INT NULL ,
`name` VARCHAR (59) NOT NULL ,
UNIQUE ( `name`, `bar` )
) ENGINE = INNODB;
MySQL允许重复以下语句,导致重复.
INSERT INTO Foo (`bar`, `name`) VALUES (NULL, 'abc');
尽管有
UNIQUE ( `name`, `bar` )
为什么容忍这种情况,如何阻止它？
我们可以从Windows命令提示符运行MySQL查询吗？如果是这样,我们如何做到这一点并通过命令提示符处理查询结果？
我刚刚在Mac OS X 10.6.6上安装了MySQL社区服务器(5.5.8).
我一直遵循安全安装的规则(为root分配密码,删除匿名帐户等),但是,有一个用户帐户,我不能DROP:
mysql> select host, user from mysql.user;
+--------------------------------+------+
| host | user |
+--------------------------------+------+
| 127.0.0.1 | root |
| ::1 | root |
| My-Computer-Hostname.local | |
| My-Computer-Hostname.local | root |
| localhost | root |
| localhost | web |
+--------------------------------+------+
6 rows in set (0.00 sec)
mysql> drop user ''@'My-Computer-Hostname.local';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> select host, user from …刚刚在mac os x 10.6上安装了MySQL 5.5,并且在许多表上都有一个奇怪的问题.以下是一个例子.插入行失败时带有外键约束,但不应该.它引用的外键确实存在.有任何想法吗？
mysql> show create table Language;
+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Language | CREATE TABLE `Language` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`Code` varchar(2) NOT NULL,
`Name` varchar(63) CHARACTER SET utf8 DEFAULT NULL,
`Variant` varchar(63) CHARACTER SET utf8 DEFAULT NULL,
`Country_Id` int(11) DEFAULT NULL,
PRIMARY KEY (`Id`),
UNIQUE KEY `Code` (`Code`,`Country_Id`,`Variant`),
KEY `FKA3ACF7789C1796EB` (`Country_Id`),
CONSTRAINT `FKA3ACF7789C1796EB` FOREIGN KEY (`Country_Id`) REFERENCES `Country` (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1 |
+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in …那么当你在LIMIT子句中使用负值时会发生什么？是否会产生负面影响(轻微的双关语)？
我没有看到关于这个和MySQL论坛的任何文档,我记得,sux.
背景:我使用的是MySQL CE 5.5.20.我编写了一个存储过程,它接受一个int参数并将其用于LIMIT子句.如果需要,我需要一种方法来返回所有行,所以我尝试在我的商店过程/例程中传入-1作为limit参数,这很有效.
让我先描述一下环境:
环境: - mac os x(java build 1.6.0_35-b10-428-11M3811) - apache tomcat 7.0.30 - mysql 5.5.27 - tomcat/lib - > mysql-connector-java-5.1.22-bin.jar
我已成功实现了JDBCRealm并希望切换到DataSourceRealm,因为它建议用于生产环境.我使用基于表单的身份验证.
我做了这里描述的所有内容:http: //tomcat.apache.org/tomcat-7.0-doc/realm-howto.html#DataSourceRealm 和这里:http: //tomcat.apache.org/tomcat-7.0-doc/jndi-数据源-例子,howto.html#MySQL_DBCP_Example
server.xml中
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.DataSourceRealm"
dataSourceName="jdbc/proto" digest="SHA-256" roleNameCol="role"
userCredCol="password" userNameCol="name" userRoleTable="roles"
userTable="users"/>
</Realm>
的context.xml
<Resource auth="Container"
driverClassName="com.mysql.jdbc.Driver"
maxActive="100" maxIdle="30" maxWait="10000"
name="jdbc/proto" password="proto" type="javax.sql.DataSource"
url="jdbc:mysql://localhost:3306/proto" username="proto"/>
WEB-INF/web.xml文件
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/proto</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
当我提交用户名和密码时,我得到以下例外:
Sep 18, 2012 9:38:32 PM org.apache.catalina.realm.DataSourceRealm open
SEVERE: Exception performing authentication
javax.naming.NameNotFoundException: Name [jdbc/proto] is not …