Insert data into MySQL in C language

写在前面的话：

1. The content of this chapter refers to the article：c语言 mysql数据库添加数据https://blog.csdn.net/qq_32162235/article/details/107413823?ops_request_misc=&request_id=&biz_id=102&utm_term=c%E8%AF%AD%E8%A8%80%E5%B0%86%E6%95%B0%E6%8D%AE%E5%86%99%E5%85%A5mysql%E4%B8%AD&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduweb~default-5-107413823.142^v35^new_blog_pos_by_title&spm=1018.2226.3001.4187
2. The code in this chapter can be run,能够添加到MySQL中（截图证明）
3.  This time the code runs in the console（采用VS的编译器）

#include<stdio.h>
#include<mysql.h>//包含mysql头文件
 
typedef struct Fruit
{
	int id;
	char f_name[20];
	double f_price;
	char f_create_time[40];
	char f_update_time[40];
	char f_content[255];
}Fruit;

//初始化信息
Fruit addInfomation(int id,char f_name[20],double f_price,char f_create_time[40],char f_update_time[40],char f_content[255]){
	Fruit fruit = {id,f_name,f_price,f_create_time,f_update_time,f_content};
	return fruit;
}

int main()
{
	//定义句柄
	MYSQL mysql;
	//定义结构体
	Fruit fruit;
	
	//初始化句柄
	if(NULL == mysql_init(&mysql))
	{
		printf("MySQL初始化失败!\n");
		return -1;
	}
 
 	//输入你的MySQLAccount and password and database name
	if(NULL == mysql_real_connect(&mysql,"localhost","root","root","_db4",0,NULL,0))
	{
		//打印错误信息
		printf("%s\n", mysql_error(&mysql));
		return -1;
	}
 
	printf("连接数据库成功！\n");
 
	//设置字符集
	mysql_set_character_set(&mysql,"utf8");
	
	//添加信息
	Fruit fruit = addInfomation(5,"哈密瓜",24.3,"2022-12-08 12:03:33","2022-12-08 12:03:33","非常好吃");
 	
	char sql[1024];
 
 	//拼接SQL语句
	sprintf(sql, "insert into student values(%d,'%s',%lf,'%s','%s','%s')",fruit.id,fruit.f_name,fruit.f_price,
		fruit.f_create_time,fruit.f_update_time,fruit.f_content);
 
	if(0 != mysql_query(&mysql,sql))
	{
		//打印信息
		printf("%s\n",mysql_error(&mysql));
		return -1;
	}
	printf("添加成功！\n");
	mysql_close(&mysql);
 
	return 0;
}

 遇到的问题：

mysql.c(2): fatal error C1083: 无法打开包括文件: “mysql.h”: No such file or directory

 

解决方案：（添加进环境变量中）

1. 首先找到mysql.h头文件：C:\Program Files\MySQL\MySQL Server 8.0\include
2. 添加进环境变量

 

 

注意：当然,You probably don't have this system environment variable,你可以参考我之前写的文章

Windows环境下在cmd中运行C++程序_星与梦想star_dream的博客-CSDN博客https://blog.csdn.net/qq_56402474/article/details/125939641?spm=1001.2014.3001.5501

Compile the source file again,You can see that we compiled successfully！ （The next step is to debug the code）

 

遇到的问题：

mysql.obj : error LNK2019: 无法解析的外部符号 mysql_init,函数 main 中引用了该符号

 

解决方案：

• just nowmysql.hThe header files are added,Now put it in the source file iemysql.c加进来
• The same operation as before,加进环境变量

库文件路径：C:\Program Files\MySQL\MySQL Server 8.0\lib

 

加进了环境变量,There are also include library files

#pragma comment(lib,"libmysql.lib")

再一次编译C语言源文件（成功！）

 

运行该可执行文件

遇到这种错误,就去我的电脑Find the change file in  （Recommended software here：Everything）

我的文件目录：C:\Program Files\MySQL\MySQL Server 8.0\lib

 

 

---

完整代码（可运行,If you want to add to your own database适当修改一下）

#include<stdio.h>
#include<mysql.h>//包含mysql头文件
#pragma comment(lib,"libmysql.lib")
 
typedef struct Fruit
{
	int id;
	char f_name[20];
	double f_price;
	char f_create_time[40];
	char f_update_time[40];
	char f_content[255];
}Fruit;

int main()
{
	//定义句柄
	MYSQL mysql;
	char sql[1024];
	
	//初始化句柄
	if(NULL == mysql_init(&mysql))
	{
		printf("MySQL初始化失败!\n");
		return -1;
	}
 
 	//输入你的MySQLAccount and password and database name
	if(NULL == mysql_real_connect(&mysql,"localhost","root","root","_db4",3306,NULL,0))
	{
		//打印错误信息
		printf("%s\n", mysql_error(&mysql));
		return -1;
	}
 
	printf("连接数据库成功！\n");
 
	//设置字符集
	mysql_set_character_set(&mysql,"utf8");
	
	//添加信息
	Fruit fruit = {5,"apple",24.3,"2022-12-08","2022-12-08","very-good"};
 
 	//拼接SQL语句
	sprintf(sql, "insert into fruits values(%d,'%s',%lf,'%s','%s','%s')",fruit.id,fruit.f_name,fruit.f_price,
		fruit.f_create_time,fruit.f_update_time,fruit.f_content);
 
	if(0 != mysql_query(&mysql,sql))
	{
		//打印信息
		printf("%s\n",mysql_error(&mysql));
		return -1;
	}
	printf("添加成功！\n");
	mysql_close(&mysql);
 
	return 0;
}