本文目录导读：

1. Introduction
2. Prerequisites
3. Step 1: Installing MySQL Server
4. Step 2: Installing Development Tools
5. Step 3: Downloading and Installing Libmysqld
6. Step 4: Configuring Your Application
7. Step 5: Testing Your Application
8. FAQs

Libmysqld Dev on CentOS: A Comprehensive Guide

Introduction

Libmysqld is a MySQL client library that allows developers to embed MySQL client functionality into their applications. It is widely used for developing applications that require database connectivity. CentOS, being a popular Linux distribution, is often chosen as the platform for such development. This article provides a comprehensive guide on how to install and develop with libmysqld on CentOS.

Prerequisites

Before you begin, ensure that you have the following prerequisites installed on your CentOS system:

• CentOS 7 or later
• GCC compiler
• Development tools (build-essential)
• MySQL server (optional, if you want to test your application with a live database)

Step 1: Installing MySQL Server

If you want to test your application with a live database, you should install the MySQL server. Here's how to do it:

sudo yum install mysql-server

After the installation, start the MySQL service and enable it to run on boot:

sudo systemctl start mysqld
sudo systemctl enable mysqld

Step 2: Installing Development Tools

Install the necessary development tools to compile and build libmysqld:

sudo yum install gcc
sudo yum install build-essential

Step 3: Downloading and Installing Libmysqld

Download the latest libmysqld source code from the MySQL website or GitHub repository. For this example, we'll use the GitHub repository:

git clone https://github.com/mysql/mysql-server.git
cd mysql-server

Now, navigate to the libmysqld directory and configure the build:

cd libmysqld
./configure --prefix=/usr/local/mysql --with-mysqld-lib=/usr/local/mysql/lib --with-mysqld-include=/usr/local/mysql/include

Compile and install the library:

make
sudo make install

Step 4: Configuring Your Application

To use libmysqld in your application, you need to include the appropriate headers and link against the library. Here's an example of how to set up a simple C application:

#include <libmysqld/mysql.h>
int main() {
    MYSQL *conn;
    conn = mysql_init(NULL);
    if (!mysql_real_connect(conn, "localhost", "user", "password", "database", 0, NULL, 0)) {
        fprintf(stderr, "%s\n", mysql_error(conn));
        mysql_close(conn);
        return 1;
    }
    // Perform database operations here
    mysql_close(conn);
    return 0;
}

Compile your application with the following command:

gcc -o myapp myapp.c -lmysqld

Step 5: Testing Your Application

Run your application to ensure it connects to the MySQL server:

./myapp

If everything is set up correctly, you should see a successful connection message.

FAQs

Question 1: Why am I getting a "libmysqld not found" error when compiling my application?

Answer 1: Ensure that the libmysqld library is installed on your system. You can check the installation by running locate libmysqld or find /usr/local/mysql/lib -name 'libmysqld*'. If the library is not found, you may need to install it again or check your include and library paths.

Question 2: How can I update libmysqld to a newer version?

Answer 2: To update libmysqld to a newer version, you can follow the same steps outlined in this guide, but replace the repository URL with the URL of the newer version. After downloading the new source code, repeat the configuration, compilation, and installation steps.