<span style="font-size:18px;">1、手写安装带mysql sdk 的mysql2、新建控制台项目，项目属性中把C:/Program Files/MySQL/MySQL Server 5.5/include 加入“包含目录”把C:/Program Files/MySQL/MySQL Server 5.5/lib 加入“库目录”3、stdafx.h中加入#include <winsock.h> //注意顺序，要放在mysql.h前#include <mysql.h>//控制台项目中要在mysql.h之前include <winsock.h>//注意lib添加到“库目录”中，而不是“引用目录”中#pragma comment(lib, "libmysql.lib")4、把libmysql.dll放到生成的exe目录下5、主要的几个例子：//执行基本查询void test1(){ MYSQL *pConn; pConn = mysql_init(NULL); //第2、3、4、5参数的意思分别是：服务器地址、用户名、密码、数据库名，第6个为mysql端口号（0为默认值3306） if(!mysql_real_connect(pConn,"localhost","root","root","test",0,NULL,0)) { printf("无法连接数据库:%s",mysql_error(pConn)); return; } mysql_query(pConn,"set names gbk");//防止乱码。设置和数据库的编码一致就不会乱码 //SET NAMES x 相当于 SET character_set_client = x;SET character_set_results = x;SET character_set_connection = x; //写set character set gbk;查询不会乱码，但是参数化插入会报错。而set names gbk则都不会乱码 //mysql_real_query比mysql_query多了个参数: 字符串query的长度, 所以适合有二进制数据的query, 而mysql_query的字符串query不能包含二进制,因为它以/0为结尾 //mysql_query() 不能传二进制BLOB字段，因为二进制信息中的/0会被误判为语句结束。 mysql_real_query() 则可以。 if(mysql_query(pConn,"select * from persons")) { printf("查询失败:%s",mysql_error(pConn)); return; } //mysql_store_result是把查询结果一次性取到客户端的离线数据集，当结果比较大时耗内存。 //mysql_use_result则是查询结果放在服务器上，客户端通过指针逐行读取，节省客户端内存。但是一个MYSQL*连接同时只能有一个未关闭的mysql_use_result查询 MYSQL_RES *result = mysql_store_result(pConn); MYSQL_ROW row; while(row = mysql_fetch_row(result)) { printf("%s %s/n",row[1],row[2]); } mysql_free_result(result); mysql_close(pConn);}//获得更新行数void test2(){ MYSQL *pConn; pConn = mysql_init(NULL); if(!mysql_real_connect(pConn,"127.0.0.1","root","root","test",0,NULL,0)) { printf("无法连接数据库：%s",mysql_error(pConn)); return; } if(mysql_query(pConn,"update persons set Age=Age+1")) { printf("执行失败：%s",mysql_error(pConn)); return; } printf("更新成功，共更新完成%d条",mysql_affected_rows(pConn)); mysql_close(pConn);}//获得自增idvoid test3(){ MYSQL *pConn; pConn = mysql_init(NULL); if(!mysql_real_connect(pConn,"127.0.0.1","root","root","test",0,NULL,0)) { printf("无法连接数据库:%s",mysql_error(pConn)); return; } mysql_query(pConn,"set names gbk"); if(mysql_query(pConn,"insert into persons(Name,Age) values('传智播客',100)")) { printf("执行insert失败%s",mysql_error(pConn)); return; } printf("执行insert成功，新id=%d",mysql_insert_id(pConn)); mysql_close(pConn);}//参数化查询void test4(){ MYSQL* pConn; pConn = mysql_init(NULL); if(!mysql_real_connect(pConn,"127.0.0.1","root","root","test",0,NULL,0)) { printf("数据库连接失败：%s",mysql_error(pConn)); return; } mysql_query(pConn,"set names gbk"); MYSQL_STMT *stmt; MYSQL_BIND bind[2]; memset(bind,0,sizeof(bind));//把is_null、length等字段默认值设置为NULL等默认值，否则执行会报错 stmt = mysql_stmt_init(pConn); char* insertSQL="insert into persons(Name,Age) values(?,?)"; if (mysql_stmt_prepare(stmt, insertSQL, strlen(insertSQL))) { fprintf(stderr, " mysql_stmt_prepare(), INSERT failed,%s/n",mysql_error(pConn)); return; } bind[0].buffer_type= MYSQL_TYPE_STRING; bind[0].buffer= "黑马"; bind[0].buffer_length= strlen("黑马"); //如果设定了buffer_length，则可以不试用length int age=3; bind[1].buffer_type= MYSQL_TYPE_LONG; bind[1].buffer= &age; bind[1].buffer_length = sizeof(age); if (mysql_stmt_bind_param(stmt, bind)) { fprintf(stderr, " mysql_stmt_bind_param() failed %s/n", mysql_stmt_error(stmt)); return; } if (mysql_stmt_execute(stmt)) { fprintf(stderr, " mysql_stmt_execute(), failed %s/n", mysql_stmt_error(stmt)); return; } mysql_stmt_close(stmt); mysql_close(pConn); printf("参数化执行SQL结束");}</span> |