c++ 操作 mysql_ieg123

演示表

mysql -u root -p 123456
 
select * from mysql_test.test01;
+---------+-----------+----------+
| test_id | test_name | test_sex |
+---------+-----------+----------+
|       0 | XiaoMing  | 0        |
|       1 | ZhangShan | 0        |
|       2 | LiShi     | 1        |
|       3 | XiaoHong  | 1        |
|       4 | WangEr    | 0        |
+---------+-----------+----------+
 
test_sex 0 为男 1 为女

mysql 头文件引用

#include "mysql.h"
#pragma comment(lib, "../lib/libmysql.lib")

连接mysql

	MYSQL _mydata;
 
	//初始 mysql 结构体
	if (NULL == mysql_init(&_mydata))
	{
		printf("mysql_init failed!\n");
		return 0;
	}
 
	//初始化数据库
	if (0 !=mysql_library_init(0,NULL,NULL))
	{
		//lib 初始化失败
		printf("mysql_library_init failed!\n");
		return 0;
	}
 
	//连接数据库
	if (mysql_real_connect(&_mydata, "localhost", "root", "123456", "mysql_test", 3306, NULL, 0) == NULL)
	{
		printf("mysql connect failed!\n");
		return 0;
	}
	printf("mysql connect succeed!\n");

查询

查询 XiaoHong 用户的 test_id(ID) 和 test_sex(性别)

	char _buf[] = "select test_id,test_sex from test01 where test_name='XiaoHong'";
	//执行 sql 语句
	if (0 != mysql_real_query(&_mydata, _buf, sizeof(_buf)))
	{
		printf("mysql_real_query failed!\n");
		return 0;
	}
	MYSQL_RES *_myres = mysql_store_result(&_mydata);//将全部数据读入缓存区
 
	MYSQL_ROW _myrow = mysql_fetch_row(_myres);//读取缓存数据
	int _id = 0;
	while (_myrow != NULL)
	{
		_id = atoi(_myrow[0]);
		if (_myrow[1])
			printf("test_id = %d | test_sex = 女\n", _id);
		else
			printf("test_id = %d | test_sex = 男\n", _id);
		_myrow = mysql_fetch_row(_myres);//循环读取
	}
	mysql_free_result(_myres);//释放缓存区数据 防止内存泄漏

修改

修改 LiShi 用户的 test_sex(性别) 为 男

	char _buf[] = "update test01 set test_sex=0 where test_name='LiShi'";
	//执行 sql 语句
	if (0 != mysql_real_query(&_mydata, _buf, sizeof(_buf)))
	{
		printf("mysql_real_query failed!\n");
		return 0;
	}

删除

删除 test_id(ID) 为 4 的数据

char _buf[] = "delete from test01 where test_id='4'";
	//执行 sql 语句
	if (0 != mysql_real_query(&_mydata, _buf, sizeof(_buf)))
	{
		printf("mysql_real_query failed!\n");
		return 0;
	}

关闭mysql连接

mysql_close(&_mydata);//关闭 mysql 连接