下载安装mysql时，新版本与旧版本的发生冲突的解决办法
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在linux下安装mysql中，与旧版本冲突的一些简单的解决办法
后附DBI作用。 下载了针对rhel4的mysql5.1.50的server包和client包，传到/root下，安装，发现与以前版本冲突，那么应该： [root@localhost ~]# ls anaconda-ks.cfg install.log MySQL-client-community-5.1.50-1.rhel4.i386.rpm Desktop install.log.syslog MySQL-server-community-5.1.50-1.rhel4.i386.rpm [root@localhost ~]# rpm -ivh My* warning: MySQL-client-community-5.1.50-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 error: Failed dependencies: MySQL conflicts with mysql-4.1.20-1.RHEL4.1.i386 MySQL-server conflicts with mysql-server-4.1.20-1.RHEL4.1.i386 [root@localhost ~]# rpm -ivh MySQL-server-community-5.1.50-1.rhel4.i386.rpm warning: MySQL-server-community-5.1.50-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 error: Failed dependencies: MySQL conflicts with mysql-4.1.20-1.RHEL4.1.i386 MySQL-server conflicts with mysql-server-4.1.20-1.RHEL4.1.i386 试试升级安装，也不行，那么就： [root@localhost ~]# rpm -Uvh MySQL-server-community-5.1.50-1.rhel4.i386.rpm warning: MySQL-server-community-5.1.50-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 error: Failed dependencies: libmysqlclient.so.14 is needed by (installed) mod_auth_mysql-2.6.1-2.2.i386 libmysqlclient.so.14 is needed by (installed) php-mysql-4.3.9-3.15.i386 libmysqlclient.so.14 is needed by (installed) cyrus-sasl-sql-2.1.19-5.EL4.i386 libmysqlclient.so.14 is needed by (installed) dovecot-0.99.11-4.EL4.i386 libmysqlclient.so.14 is needed by (installed) perl-DBD-MySQL-2.9004-3.1.i386 libmysqlclient.so.14 is needed by (installed) freeradius-mysql-1.0.1-3.RHEL4.3.i386 libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) php-mysql-4.3.9-3.15.i386 那就只有先卸掉冲突的包，先查看一下相关的包： [root@localhost ~]# rpm -qa |grep perl-DB* perl-Digest-SHA1-2.07-5 perl-DBI-1.40-8 perl-DateManip-5.42a-3 perl-DBD-MySQL-2.9004-3.1 perl-Digest-HMAC-1.01-13 perl-DBD-Pg-1.31-6 perl-Date-Calc-5.3-9 [root@localhost ~]# rpm -e perl-DBD-MySQL-2.9004-3.1 error: Failed dependencies: perl-DBD-MySQL is needed by (installed) mysql-server-4.1.20-1.RHEL4.1.i386 卸不掉，此包被mysql-server-4.1.20-1.RHEL4.1.i386依赖，于是把它们一起卸载，-e后的包顺序无所谓，linux会自己协调处理： [root@localhost ~]# rpm -e perl-DBD-MySQL-2.9004-3.1 mysql-server-4.1.20-1.RHEL4.1.i386 卸载成功。 [root@localhost ~]# rpm -qa |grep perl-DB* perl-Digest-SHA1-2.07-5 perl-DBI-1.40-8 perl-DateManip-5.42a-3 perl-Digest-HMAC-1.01-13 perl-DBD-Pg-1.31-6 perl-Date-Calc-5.3-9 重新安装，还是有依赖关系问题： [root@localhost ~]# rpm -ivh M* warning: MySQL-client-community-5.1.50-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 error: Failed dependencies: MySQL conflicts with mysql-4.1.20-1.RHEL4.1.i386 再看看相关的包： [root@localhost ~]# rpm -qa |grep perl-DB* perl-Digest-SHA1-2.07-5 perl-DBI-1.40-8 perl-DateManip-5.42a-3 perl-Digest-HMAC-1.01-13 perl-DBD-Pg-1.31-6 perl-Date-Calc-5.3-9 于是继续卸载 [root@localhost ~]# rpm -e perl-DBI-1.40-8 error: Failed dependencies: perl(DBI) is needed by (installed) mysql-4.1.20-1.RHEL4.1.i386 perl(DBI) is needed by (installed) mysql-bench-4.1.20-1.RHEL4.1.i386 perl(DBI) is needed by (installed) perl-DBD-Pg-1.31-6.i386 perl-DBI is needed by (installed) perl-DBD-Pg-1.31-6.i386 又被几个包依赖，于是把它们加上再卸载，这些包也被依赖： [root@localhost ~]# rpm -e perl-DBI-1.40-8 mysql-4.1.20-1.RHEL4.1.i386 mysql-bench-4.1.20-1.RHEL4.1.i386 perl-DBD-Pg-1.31-6.i386 perl-DBD-Pg-1.31-6.i386 error: Failed dependencies: libmysqlclient.so.14 is needed by (installed) mod_auth_mysql-2.6.1-2.2.i386 libmysqlclient.so.14 is needed by (installed) php-mysql-4.3.9-3.15.i386 libmysqlclient.so.14 is needed by (installed) cyrus-sasl-sql-2.1.19-5.EL4.i386 libmysqlclient.so.14 is needed by (installed) dovecot-0.99.11-4.EL4.i386 libmysqlclient.so.14 is needed by (installed) freeradius-mysql-1.0.1-3.RHEL4.3.i386 libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) php-mysql-4.3.9-3.15.i386 mysql = 4.1.20-1.RHEL4.1 is needed by (installed) mysql-devel-4.1.20-1.RHEL4.1.i386 mysql is needed by (installed) freeradius-mysql-1.0.1-3.RHEL4.3.i386 于是把它们再次一起卸载，把这些包写入一行，终于成功了！： rpm -e perl-DBI-1.40-8 mysql-4.1.20-1.RHEL4.1.i386 mysql-bench-4.1.20-1.RHEL4.1.i386 perl-DBD-Pg-1.31-6.i386 perl-DBD-Pg-1.31-6.i386 mod_auth_mysql-2.6.1-2.2.i386 php-mysql-4.3.9-3.15.i386 cyrus-sasl-sql-2.1.19-5.EL4.i386 dovecot-0.99.11-4.EL4.i386 freeradius-mysql-1.0.1-3.RHEL4.3.i386 php-mysql-4.3.9-3.15.i386 mysql-devel-4.1.20-1.RHEL4.1.i386 freeradius-mysql-1.0.1-3.RHEL4.3.i386 然后执行mysql5的安装，终于成功！： [root@localhost ~]# ls anaconda-ks.cfg install.log MySQL-client-community-5.1.50-1.rhel4.i386.rpm Desktop install.log.syslog MySQL-server-community-5.1.50-1.rhel4.i386.rpm [root@localhost ~]# rpm -ivh M* warning: MySQL-client-community-5.1.50-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 Preparing... ########################################### [100%] 1:MySQL-server-community ########################################### [ 50%] PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER ! To do so, start the server, then issue the following commands: /usr/bin/mysqladmin -u root password 'new-password' /usr/bin/mysqladmin -u root -h localhost password 'new-password' Alternatively you can run: /usr/bin/mysql_secure_installation which will also give you the option of removing the test databases and anonymous user created by default. This is strongly recommended for production servers. See the manual for more instructions. Please report any problems with the /usr/bin/mysqlbug script! Notes regarding SELinux on this platform: ========================================= The default policy might cause server startup to fail because it is not allowed to access critical files. In this case, please update your installation. The default policy might also cause inavailability of SSL related features because the server is not allowed to access /dev/random and /dev/urandom. If this is a problem, please do the following: 1) install selinux-policy-targeted-sources from your OS vendor 2) add the following two lines to /etc/selinux/targeted/src/policy/domains/program/mysqld.te: allow mysqld_t random_device_t:chr_file read; allow mysqld_t urandom_device_t:chr_file read; 3) cd to /etc/selinux/targeted/src/policy and issue the following command: make load Starting MySQL..[ OK ] Giving mysqld 2 seconds to start 2:MySQL-client-community ########################################### [100%] [root@localhost ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.1.50-community MySQL Community Server (GPL) Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. This software comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to modify and redistribute it under the GPL v2 license Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | test | +--------------------+ 3 rows in set (0.01 sec) mysql> exit Bye DBI的一些简单应用： 编写一些能够访问MySQL数据库的Perl脚本，就需要安装DBI模块 什么是DBI呢? 答：简单的说，以下答案引自DBI的作者Tim Bunce："DBI是用于Perl语言、操作数据库的应用程序 接口(API)。DBI API规范定义了一套函数(functions),变量和协定, 提供了一个稳定的 数据库接口而不必考虑实际使用什么样的数据库" 用更精炼的语言来描述就是,DBI作为 Perl语言的接口,允许使用者不需要更改程序就可以操作不同的数据库。
以上的知识是不是对大家有起到作用呢，希望能很好的帮助大家・・・・
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