客户端访问服务端的数据库，客户端需要安装相关软件驱动。

java只要有对应的jar文件即可，根本不需要配置客户端
oracle只要有个class12.jar
sqlserver只要有msqlserver.jar，msbase.jar，msutil.jar
msql只要有mm.mysql.jar

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[root@192 ~]# rpm -q mariadb
未安装软件包 mariadb
[root@192 ~]# which mysql
/bin/mysql

[feng@192 ~]$ rpm -qa | grep mysql
mysql-community-release-el7-5.noarch
mysql-community-server-5.7.17-1.el7.x86_64
mysql-community-embedded-compat-5.7.17-1.el7.x86_64
mysql-community-common-5.7.17-1.el7.x86_64
mysql-community-devel-5.7.17-1.el7.x86_64
mysql-community-test-5.7.17-1.el7.x86_64
mysql-community-minimal-debuginfo-5.7.17-1.el7.x86_64
mysql-community-libs-5.7.17-1.el7.x86_64
mysql-community-embedded-5.7.17-1.el7.x86_64
mysql-community-embedded-devel-5.7.17-1.el7.x86_64
mysql-community-client-5.7.17-1.el7.x86_64
mysql-community-libs-compat-5.7.17-1.el7.x86_64
php-mysql-5.4.16-48.el7.x86_64

RPM是RedHat Package Manger（RedHat软件管理工具),是一种用于打包及安装工具

-qa代表query(询问)，a代表all

grep(global search rgular expression(RE) and print out the line):是一种强大的文本搜索工具