用C ++连接到本地数据库（SQL Server）

Question

I have a database connection to SQL Server using c++. I am trying to connect to localdb instance which I created in my SQL Server Management Studio, and the name of database is "filingdb", server is "(localdb)\\filing". I copied the code from some other site and trying to query, the problem which I am facing is here as I have shared the error list:

Error   8   error C2440: '=' : cannot convert from 'System::Data::SqlClient::SqlCommandBuilder *' to 'System::Data::SqlClient::SqlCommandBuilder ^' 143 1   cvtest
Error   6   error C2440: '=' : cannot convert from 'System::Data::SqlClient::SqlDataAdapter *' to 'System::Data::SqlClient::SqlDataAdapter ^'   139 1   cvtest
Error   4   error C2440: 'initializing' : cannot convert from 'System::Data::DataSet *' to 'System::Data::DataSet ^'    126 1   cvtest
Error   2   error C2440: 'initializing' : cannot convert from 'System::Data::SqlClient::SqlConnection *' to 'System::Data::SqlClient::SqlConnection ^'  125 1   cvtest
Error   3   error C2750: 'System::Data::DataSet' : cannot use 'new' on the reference type; use 'gcnew' instead  126 1   cvtest

System::Data::SqlClient::SqlCommandBuilder ' this is the major issue which I am facing

I have tried other ways too, but I am still getting the same error

Error   12  error C2440: '=' : cannot convert from 'System::Data::SqlClient::SqlCommandBuilder *' to 'System::Data::SqlClient::SqlCommandBuilder ^' 140 1   cvtest
Error   10  error C2440: '=' : cannot convert from 'System::Data::SqlClient::SqlDataAdapter *' to 'System::Data::SqlClient::SqlDataAdapter ^'   136 1   cvtest
Error   6   error C2440: 'initializing' : cannot convert from 'System::Data::DataSet *' to 'System::Data::DataSet ^'    126 1   cvtest
Error   3   error C2440: 'initializing' : cannot convert from 'System::Data::SqlClient::SqlConnection *' to 'System::Data::SqlClient::SqlConnection ^'  125 1   cvtest
Error   5   error C2750: 'System::Data::DataSet' : cannot use 'new' on the reference type; use 'gcnew' instead  126 1   cvtest
Error   11  error C2750: 'System::Data::SqlClient::SqlCommandBuilder' : cannot use 'new' on the reference type; use 'gcnew' instead 140 1   cvtest
Error   2   error C2750: 'System::Data::SqlClient::SqlConnection' : cannot use 'new' on the reference type; use 'gcnew' instead 125 1   cvtest
Error   9   error C2750: 'System::Data::SqlClient::SqlDataAdapter' : cannot use 'new' on the reference type; use 'gcnew' instead    136 1   cvtest

Can any one please offer advice on how to solve this problem, any other method of connection, and can any one suggest any good link for future use to register connecting database using SQL Server?

Answer 1

As an answer to your need of connection strings:

• Source

LocalDB (SQL Server 2012):

LocalDB named instance :

Server=(localdb)\MyInstance;Integrated Security=true;

---

If you want to connect to your local SQL Server you can use " . " instead of "IP" or name of your server.

Answer 2

通过猜测错误消息，创建任何托管对象时，都必须使用gcnew，即：

System::Data::SqlClient::SqlCommandBuilder^ cmdBuilder = gcnew System::Data::SqlClient::SqlCommandBuilder();