直接通过ODBC读写Excel表格文件
译者:徐景周(原作:Alexander Mikula)
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想要通过ODBC直接读、写Excel表格文件,首先,应确保ODBC中已安装有Excel表格文件的驱动"MICROSOFT EXCELDRIVER (*.XLS)"。然后,可根据下面步骤进行:
#include <afxdb.h>#include <odbcinst.h>
//创建并写入Excel文件void CRWExcel::WriteToExcel(){CDatabase database;CString sDriver = "MICROSOFT EXCEL DRIVER (*.XLS)"; // Excel安装驱动CString sExcelFile = "c:\\demo.xls"; // 要建立的Excel文件CString sSql;TRY{// 创建进行存取的字符串sSql.Format("DRIVER={%s};DSN=‘‘‘‘;FIRSTROWHASNAMES=1;READONLY=FALSE;CREATE_DB=\"%s\";DBQ=%s",sDriver, sExcelFile, sExcelFile);// 创建数据库 (既Excel表格文件)if( database.OpenEx(sSql,CDatabase::noOdbcDialog) ){// 创建表结构(姓名、年龄)sSql = "CREATE TABLE demo (Name TEXT,Age NUMBER)";database.ExecuteSQL(sSql);// 插入数值sSql = "INSERT INTO demo (Name,Age) VALUES (‘‘徐景周‘‘,26)";database.ExecuteSQL(sSql);sSql = "INSERT INTO demo (Name,Age) VALUES (‘‘徐志慧‘‘,22)";database.ExecuteSQL(sSql);sSql = "INSERT INTO demo (Name,Age) VALUES (‘‘郭徽‘‘,27)";database.ExecuteSQL(sSql);}// 关闭数据库database.Close();}CATCH_ALL(e){TRACE1("Excel驱动没有安装: %s",sDriver);}END_CATCH_ALL;}
// 读取Excel文件void CRWExcel::ReadFromExcel(){CDatabase database;CString sSql;CString sItem1, sItem2;CString sDriver;CString sDsn;CString sFile = "Demo.xls"; // 将被读取的Excel文件名// 检索是否安装有Excel驱动 "Microsoft Excel Driver (*.xls)"sDriver = GetExcelDriver();if (sDriver.IsEmpty()){// 没有发现Excel驱动AfxMessageBox("没有安装Excel驱动!");return;}// 创建进行存取的字符串sDsn.Format("ODBC;DRIVER={%s};DSN=‘‘‘‘;DBQ=%s", sDriver, sFile);TRY{// 打开数据库(既Excel文件)database.Open(NULL, false, false, sDsn);CRecordset recset(&database);// 设置读取的查询语句.sSql = "SELECT Name, Age ""FROM demo ""ORDER BY Name ";// 执行查询语句recset.Open(CRecordset::forwardOnly, sSql, CRecordset::readOnly);// 获取查询结果while (!recset.IsEOF()){//读取Excel内部数值recset.GetFieldValue("Name ", sItem1);recset.GetFieldValue("Age", sItem2);// 移到下一行recset.MoveNext();}// 关闭数据库database.Close();}CATCH(CDBException, e){// 数据库操作产生异常时...AfxMessageBox("数据库错误: " + e->m_strError);}END_CATCH;}
CString CRWExcel::GetExcelDriver(){char szBuf[2001];WORD cbBufMax = 2000;WORD cbBufOut;char *pszBuf = szBuf;CString sDriver;// 获取已安装驱动的名称(涵数在odbcinst.h里)if (!SQLGetInstalledDrivers(szBuf, cbBufMax, &cbBufOut))return "";// 检索已安装的驱动是否有Excel...do{if (strstr(pszBuf, "Excel") != 0){//发现 !sDriver = CString(pszBuf);break;}pszBuf = strchr(pszBuf, ‘‘\0‘‘) + 1;}while (pszBuf[1] != ‘‘\0‘‘);return sDriver;}作者信息:
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