Visual c++ 使用Visual C+;连接到MSSQL Server Express并提取一些表数据的最少代码+;快车
我在机器上安装了以下软件:Visual c++ 使用Visual C+;连接到MSSQL Server Express并提取一些表数据的最少代码+;快车,visual-c++,sql-server-express,visual-studio-express,Visual C++,Sql Server Express,Visual Studio Express,我在机器上安装了以下软件: Microsoft SQL Server Express 2005 微软Visual C++表示2008 我有一个.mdf文件,需要从中读取一些数据并转储到文本文件。我可以在VisualStudio中使用数据库资源管理器浏览数据库文件,但从应用程序连接时遇到问题 我在谷歌上搜索了很多地方,几乎所有的“解决方案”都说我应该开始一个新的项目,并选择“SQLServer应用程序模板”,我在模板中没有这个模板。我找到的其他教程说我应该使用“数据源配置向导”,但是我在任何
- Microsoft SQL Server Express 2005 微软Visual C++表示2008
DbConnection *d = new MSSQLConnection("local", "c:\path\to\file.mdf");
DbQuery *q = new DbQuery(d, "select * from mytable");
...dump the data and go home
谢谢
或者,如果有人可以告诉我如何在C++中执行此操作:
就在这里。一旦你知道了,就变得简单易懂了
SqlConnection^ myConnection = gcnew SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=\"file.mdf\";Integrated Security=True;Connect Timeout=10;User Instance=True");
myConnection->Open();
SqlCommand^ scmd = gcnew SqlCommand("select ID from atable", myConnection);
SqlDataReader^ r = scmd->ExecuteReader();
while (r->Read())
__int64 id = r->GetInt64(0);
r->Close();
这对我有用
#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <sqltypes.h>
#include <sql.h>
#include <sqlext.h>
using namespace std;
int main() {
#define SQL_RESULT_LEN 240
#define SQL_RETURN_CODE_LEN 1000
//define handles and variables
SQLHANDLE sqlConnHandle;
SQLHANDLE sqlStmtHandle;
SQLHANDLE sqlEnvHandle;
SQLWCHAR retconstring[SQL_RETURN_CODE_LEN];
//initializations
sqlConnHandle = NULL;
sqlStmtHandle = NULL;
//allocations
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &sqlEnvHandle))
goto COMPLETED;
if (SQL_SUCCESS != SQLSetEnvAttr(sqlEnvHandle, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0))
goto COMPLETED;
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_DBC, sqlEnvHandle, &sqlConnHandle))
goto COMPLETED;
//output
cout << "Attempting connection to SQL Server...";
cout << "\n";
//connect to SQL Server
//I am using a trusted connection and port 14808
//it does not matter if you are using default or named instance
//just make sure you define the server name and the port
//You have the option to use a username/password instead of a trusted connection
//but is more secure to use a trusted connection
switch (SQLDriverConnectW(sqlConnHandle,
NULL,
(SQLWCHAR*)L"DRIVER={SQL Server};SERVER=ServerAddress, 1433;DATABASE=DataBaseName;UID=DataBaseUserName;PWD=PassWord;",
//(SQLWCHAR*)L"DRIVER={SQL Server};SERVER=localhost, 1433;DATABASE=master;Trusted=true;",
SQL_NTS,
retconstring,
1024,
NULL,
SQL_DRIVER_NOPROMPT)) {
case SQL_SUCCESS:
cout << "Successfully connected to SQL Server";
cout << "\n";
break;
case SQL_SUCCESS_WITH_INFO:
cout << "Successfully connected to SQL Server";
cout << "\n";
break;
case SQL_INVALID_HANDLE:
cout << "Could not connect to SQL Server";
cout << "\n";
goto COMPLETED;
case SQL_ERROR:
cout << "Could not connect to SQL Server";
cout << "\n";
goto COMPLETED;
default:
break;
}
//if there is a problem connecting then exit application
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_STMT, sqlConnHandle, &sqlStmtHandle))
goto COMPLETED;
//output
cout << "\n";
cout << "Executing T-SQL query...";
cout << "\n";
//if there is a problem executing the query then exit application
//else display query result
if (SQL_SUCCESS != SQLExecDirectW(sqlStmtHandle, (SQLWCHAR*)L"SELECT @@VERSION", SQL_NTS)) {
cout << "Error querying SQL Server";
cout << "\n";
goto COMPLETED;
}
else {
//declare output variable and pointer
SQLCHAR sqlVersion[SQL_RESULT_LEN];
SQLINTEGER ptrSqlVersion;
while (SQLFetch(sqlStmtHandle) == SQL_SUCCESS) {
SQLGetData(sqlStmtHandle, 1, SQL_CHAR, sqlVersion, SQL_RESULT_LEN, &ptrSqlVersion);
//display query result
cout << "\nQuery Result:\n\n";
cout << sqlVersion << endl;
}
}
//close connection and free resources
COMPLETED:
SQLFreeHandle(SQL_HANDLE_STMT, sqlStmtHandle);
SQLDisconnect(sqlConnHandle);
SQLFreeHandle(SQL_HANDLE_DBC, sqlConnHandle);
SQLFreeHandle(SQL_HANDLE_ENV, sqlEnvHandle);
//pause the console window - exit when key is pressed
cout << "\nPress any key to exit...";
getchar();
}
#包括“stdafx.h”
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使用名称空间std;
int main(){
#定义SQL\u结果\u LEN 240
#定义SQL\u返回\u代码\u LEN 1000
//定义句柄和变量
SQLHANDLE-sqlConnHandle;
SQLHANDLE-sqlStmtHandle;
SQLHANDLE-sqlEnvHandle;
SQLWCHAR重新构造[SQL\u RETURN\u CODE\u LEN];
//初始化
sqlConnHandle=NULL;
sqlStmtHandle=NULL;
//分配
if(SQL\u SUCCESS!=SQLAllocHandle(SQL\u HANDLE\u ENV、SQL\u NULL\u HANDLE和sqlEnvHandle))
后藤完成;
if(SQL_SUCCESS!=SQLSetEnvAttr(sqlEnvHandle,SQL_ATTR_ODBC_版本,(SQLPOINTER)SQL_OV_ODBC3,0))
后藤完成;
if(SQL\u SUCCESS!=SQLAllocHandle(SQL\u HANDLE\u DBC、sqlEnvHandle和sqlConnHandle))
后藤完成;
//输出
这样做,哪些头文件/引用我需要包括?这是C++ + CLI或特殊的MS.NET C++。