VS connects to MYSQL through ODBC (2)

I. Result display

If you want data like this, the following code may help

Second, code sharing

#include#include#include #include#include 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;// allocate environment handleret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &serverhenv);//set environment propertiesret = SQLSetEnvAttr(serverhenv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);if (!SQL_SUCCEEDED(ret)) {cout << "AllocEnvHandle error!" << endl;system("pause");}// allocate connection handleret = SQLAllocHandle(SQL_HANDLE_DBC, serverhenv, &serverhdbc);if (!SQL_SUCCEEDED(ret)) {cout << "AllocDbcHandle error!" << endl;system("pause");}//Database linkage//ret = SQLConnect(serverhdbc, (SQLCHAR*)"odbc_test(data source name)", SQL_NTS, (SQLCHAR*)"root(database user name)", SQL_NTS, (SQLCHAR*)"123456(database user password)", SQL_NTS);ret = SQLConnect(serverhdbc, (SQLCHAR*)"vsodbc07", SQL_NTS, (SQLCHAR*)"root", SQL_NTS, (SQLCHAR*)"root", SQL_NTS);//Connect to the databaseif (!SQL_SUCCEEDED(ret)) {cout << "SQL_Connect error!" << endl;system("pause");}// allocate the execution statement handleret = SQLAllocHandle(SQL_HANDLE_STMT, serverhdbc, &serverhstmt);//Execute the SQL statement//ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"insert into course values('C01','database','spring',NULL);", SQL_NTS);//insert data//ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"update course set semester='Autumn' where cno='C01';", SQL_NTS);//Modify data//ret = SQLExecDirect(serverhstmt, (SQLCHAR*)"delete from course where cno='C01';", SQL_NTS);//delete dataret = SQLExecDirect(serverhstmt, (SQLCHAR*)"select * from course;", SQL_NTS);if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO){// bind dataSQLBindCol(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);//Move the cursor to the next row, that is, get the downlink data//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;}}}// release the statement handleret = SQLFreeHandle(SQL_HANDLE_STMT, serverhstmt);if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)cout << "free hstmt error!" << endl;// disconnect the database connectionret = SQLDisconnect(serverhdbc);if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)cout << "disconnected error!" << endl;// release the connection handleret = SQLFreeHandle(SQL_HANDLE_DBC, serverhdbc);if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)cout << "free hdbc error!" << endl;// release the environment handle handleret = SQLFreeHandle(SQL_HANDLE_ENV, serverhenv);if (SQL_SUCCESS != ret && SQL_SUCCESS_WITH_INFO != ret)cout << "free henv error!" << endl;system("pause");}

Both blogs are about VS connecting to MYSQL through ODBC

The next article will share VS direct connection to MYSQL

Welcome to discuss~