VS通过ODBC连接MYSQL(二)

一、结果展示

如果你想得到类似这样的数据，接下来的代码或许有所帮助

二、代码分享

#include<windows.h>
#include<iostream>
#include <assert.h>
#include<sql.h>
#include <sqlext.h>
using namespace std;

int main() {
	SQLHENV serverhenv;
	SQLHDBC serverhdbc;
	SQLHSTMT serverhstmt;
	SQLRETURN ret;
	SQLCHAR cno[20] = { 0 }, cname[20] = { 0 }, semester[10] = { 10 };
	//SQLINTEGER grade = 0, length;
	SQLLEN grade = 0, length;

	//分配环境句柄
	ret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &serverhenv);

	//设置环境属性
	ret = SQLSetEnvAttr(serverhenv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);
	if (!SQL_SUCCEEDED(ret)) {
		cout << "AllocEnvHandle error!" << endl;
		system("pause");
	}

	//分配连接句柄
	ret = SQLAllocHandle(SQL_HANDLE_DBC, serverhenv, &serverhdbc);
	if (!SQL_SUCCEEDED(ret)) {
		cout << "AllocDbcHandle error!" << endl;
		system("pause");
	}
		//数据库连接
	//ret = SQLConnect(serverhdbc, (SQLCHAR*)"odbc_test（数据源名称）", SQL_NTS, (SQLCHAR*)"root（数据库用户名）", SQL_NTS, (SQLCHAR*)"123456（数据库用户密码）", SQL_NTS);
		ret = SQLConnect(serverhdbc, (SQLCHAR*)"vsodbc07", SQL_NTS, (SQLCHAR*)"root", SQL_NTS, (SQLCHAR*)"root", SQL_NTS);//连接数据库
		if (!SQL_SUCCEEDED(ret)) {
			cout << "SQL_Connect error!" << endl;
			system("pause");
		}

		//分配执行语句句柄
		ret = SQLAllocHandle(SQL_HANDLE_STMT, serverhdbc, &serverhstmt);
		//执行SQL语句

		//ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"insert into course values('C01','数据库','春',NULL);", SQL_NTS);//插入数据
		//ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"update course set semester='秋' where cno='C01';", SQL_NTS);//修改数据
	   //ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"delete from course  where cno='C01';", SQL_NTS);//删除数据
		ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"select * from course;", SQL_NTS);

		if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO){
			//绑定数据
			SQLBindCol(serverhstmt, 1, SQL_C_CHAR, (void*)cno, sizeof(cno), &length);
			SQLBindCol(serverhstmt, 2, SQL_C_CHAR, (void*)cname, sizeof(cname), &length);
			SQLBindCol(serverhstmt, 3, SQL_C_CHAR, (void*)semester, sizeof(semester), &length);
			//将光标移动到下行,即获得下行数据
			//while (SQL_NO_DATA != SQLFetch(serverhstmt)) {
			for (int i = 0;i<3; i++) {
		    if(SQL_NO_DATA != SQLFetch(serverhstmt)){    
				cout << "cno:" << cno << " cname:" << cname << " semester:" << semester;
				cout << "55"<< endl;
				}
			}
		}

		//释放语句句柄
		ret = SQLFreeHandle(SQL_HANDLE_STMT, serverhstmt);
		if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)
			cout << "free hstmt error!" << endl;
		//断开数据库连接
		ret = SQLDisconnect(serverhdbc);
		if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)
			cout << "disconnected error!" << endl;
		//释放连接句柄
		ret = SQLFreeHandle(SQL_HANDLE_DBC, serverhdbc);
		if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)
			cout << "free hdbc error!" << endl;
		//释放环境句柄句柄
		ret = SQLFreeHandle(SQL_HANDLE_ENV, serverhenv);
		if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)
			cout << "free henv error!" << endl;
		system("pause");
	
}

这两篇博客都是关于VS通过ODBC连接MYSQL

下一篇将分享VS直接连接MYSQL

欢迎交流探讨~