mariadbpp是C++的mariadb库，最近在CentOS7下编译mariadbpp总出错，错误信息如下：
CMake Error at CMakeLists.txt:17 (find_package):
By not providing "FindMariaDBClient.cmake" in CMAKE_MODULE_PATH this
project has asked CMake to find a package configuration file provided by
"MariaDBClient", but CMake did not find one.
Could not find a package configuration file provided by "MariaDBClient"
with any of the following names:
MariaDBClientConfig.cmake
mariadbclient-config.cmake
Add the installation prefix of "MariaDBClient" to CMAKE_PREFIX_PATH or set
"MariaDBClient_DIR" to a directory containing one of the above files. If
"MariaDBClient" provides a separate development package or SDK, be sure it has been
我在CentOS7系统下已经使用yum安装了mariadb数据库，包括mariadb的C语言库mariadb-connector-c
安装mariadb-connector-c很简单，在mariadb-connector-c所在目录直接运行如下命令即可：
[root@VM_0_9_centos mariadb-connector-c]#
[root@VM_0_9_centos mariadb-connector-c]# mkdir build
[root@VM_0_9_centos mariadb-connector-c]# cd build/
[root@VM_0_9_centos build]# ls
[root@VM_0_9_centos build]# cmake ..
-- The C compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
....................
[root@VM_0_9_centos build]# make
[root@VM_0_9_centos build]# make install
刚开始的时候我是直接从github上面下载的mariadbpp的zip压缩包，然后和上面相同的方式使用cmake编译总是报错。
最后使用google在stackoverflow上面找到一篇俄文的问题在C ++中连接MariaDB
在github上面https://github.com/viaduck/mariadbpp
我直接在CentOS7中使用git克隆源代码，然后按照如下方法编译源代码
Initialize Git submodules: git submodule update --init
Install mariadbclient or mysqlclient libraries.
Link against the mariadbclientpp CMake target in your project.
git clone https://github.com/viaduck/mariadbpp.git
cd mariadbpp
git submodule update --init
mkdir build
cd build
cmake ..
make
make install
比较关键的是git submodule update --init这条命令，运行后可以看到在mariadbpp源代码的external目录下多出了FindMariaDBClient.cmake文件，刚好是之前编译出现的缺少的文件，如下图所示：
默认mariadbpp编译出来的是静态库，如果需要动态库需要稍微修改下CMakeLists.txt文件的
# set up target
add_library(mariadbclientpp ${mariadbclientpp_SOURCES} ${mariadbclientpp_PUBLIC_HEADERS} ${mariadbclientpp_PRIVATE _HEADERS})
修改成
# set up target
add_library(mariadbclientpp SHARED ${mariadbclientpp_SOURCES} ${mariadbclientpp_PUBLIC_HEADERS} ${mariadbclientpp_PRIVATE _HEADERS})
即加了一个SHARED
默认在/usr/local/lib/目录下生成的是libmariadbclientpp.a静态库文件，修改后在/usr/local/lib/目录下生成的是libmariadbclientpp.so动态库文件。
这样就可以使用mariadbpp库，编写C++代码操作mysql或者mariadb数据库了。
参考资料：
1、mariadbpp
2、在C ++中连接MariaDB
3、《CMake实践》笔记三：构建静态库(.a) 与 动态库(.so) 及 如何使用外部共享库和头文件
4、mariadb-connector-c
