当我想调试此代码时,它会在 objConnection.Open() 上给出错误:
sqlExeption 未处理并说(在建立与 SQL Server 的连接时发生与网络相关或特定于实例的错误。未找到或无法访问服务器。验证实例名称是否正确以及 SQL Server 是否配置为允许远程连接。(提供者:命名管道提供者,错误:40 - 无法打开与 SQL Server 的连接))
SqlConnection objConnection = new SqlConnection(
"server=localhost;database=pubs;" +
"user id=sa;password=");
SqlDataAdapter objDataAdapter = new SqlDataAdapter();
DataSet objDataSet = new DataSet();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Set the SelectCommand properties...
objDataAdapter.SelectCommand = new SqlCommand();
objDataAdapter.SelectCommand.Connection =
objConnection;
objDataAdapter.SelectCommand.CommandText =
"SELECT au_lname, au_fname, title, price " +
"FROM authors " +
"JOIN titleauthor ON authors.au_id = " +
"titleauthor.au_id " +
"JOIN titles ON titleauthor.title_id = " +
"titles.title_id " +
"ORDER BY au_lname, au_fname";
objDataAdapter.SelectCommand.CommandType =
CommandType.Text;
// Open the database connection...
**objConnection.Open();**
// Fill the DataSet object with data...
objDataAdapter.Fill(objDataSet, "authors");
// Close the database connection...
objConnection.Close();
// Set the DataGridView properties
// to bind it to our data...
grdAuthorTitles.AutoGenerateColumns = true;
grdAuthorTitles.DataSource = objDataSet;
grdAuthorTitles.DataMember = "authors";
// Clean up
objDataAdapter = null;
objConnection = null;
}