c语言连接数据库以及对数据库操作

查询数据库接口代码

原数据库效果：

所有的表

表中原始数据为空，表属性为

#include 
#include 

int main()
{
	MYSQL *conn;
	MYSQL_RES *res;
	MYSQL_ROW row;
	char* server="localhost";//本地连接
	char* user="root";//
	char* password="525215980";//mysql密码
	char* database="student";//数据库名
	char* query="select * from class";//需要查询的语句
	int t,r;
	conn=mysql_init(NULL);
	if(!mysql_real_connect(conn,server,user,password,database,0,NULL,0))
	{
		printf("Error connecting to database:%s\n",mysql_error(conn));
	}else{
		printf("Connected...\n");
	}
	t=mysql_query(conn,query);
	if(t)
	{
		printf("Error making query:%s\n",mysql_error(conn));
	}else{
		printf("Query made...\n");
		res=mysql_use_result(conn);
		if(res)
		{
			while((row=mysql_fetch_row(res))!=NULL)
			{	
				//printf("num=%d\n",mysql_num_fields(res));//列数
				for(t=0;t

执行完上述代码数据库中数据为

插入

#include 
#include 
#include 
int main(int argc,char* argv[])
{
	MYSQL *conn;
	MYSQL_RES *res;
	MYSQL_ROW row;
	char* server="localhost";
	char* user="root";
	char* password="525215980";
	char* database="student";
	char query[200];
	int t,r;
	FILE *fp;
	if(argc!=3)
	{
		printf("error args\n");
		return -1;
	}
	fp=fopen(argv[1],"r");
	if(NULL==fp)
	{
		perror("fopen");
		return -1;
	}
	char name[30];
	conn=mysql_init(NULL);
	if(!mysql_real_connect(conn,server,user,password,database,0,NULL,0))
	{
		printf("Error connecting to database:%s\n",mysql_error(conn));
	}else{
		printf("Connected...\n");
	}
	char people[20];
	strcpy(people,argv[2]);
	while(memset(name,0,sizeof(name)),fgets(name,sizeof(name),fp)!=NULL)
	{
		name[strlen(name)-1]='\0';
		memset(query,0,sizeof(query));
		sprintf(query,"%s%s%s%s%s","insert into class(code,name) values('",name,"','",people,"')");//插入语句，根据自己情况改变
		puts(query);
		t=mysql_query(conn,query);
		if(t)
		{
			printf("Error making query:%s\n",mysql_error(conn));
			break;
		}else{
			printf("insert success\n");
		}
	}			
	fclose(fp);
	mysql_close(conn);
	return 0;
}

执行完上述代码数据库中数据为

删除

#include 
#include 

int main()
{
	MYSQL *conn;
	MYSQL_RES *res;
	MYSQL_ROW row;
	char* server="localhost";
	char* user="root";
	char* password="525215980";
	char* database="student";
	char* query="delete from class where name='yuting'";//只需要改变这一句
	int t,r;
	conn=mysql_init(NULL);
	if(!mysql_real_connect(conn,server,user,password,database,0,NULL,0))
	{
		printf("Error connecting to database:%s\n",mysql_error(conn));
	}else{
		printf("Connected...\n");
	}
	t=mysql_query(conn,query);
	if(t)
	{
		printf("Error making query:%s\n",mysql_error(conn));
	}else{
		printf("delete success\n");
	}
	mysql_close(conn);
	return 0;
}

执行完上述代码数据库结果为