从c#向存储过程传递参数
本文关键字:参数 存储过程 | 更新日期: 2023-09-27 18:03:28
我是存储过程的新手,我以前通常做的是有一个数据库类并将sql查询传递给选择或更新方法。现在我为我的数据库创建了以下类
class DatabaseService
{
static SqlConnection connection;
public void getConnection()
{
try
{
connection = new SqlConnection("Data Source=PC-DILUKSHAN''SQLEXPRESS;Initial Catalog=SPTESTDB;User ID=user;Password=1234");
connection.Open();
}
catch (Exception e)
{
throw e;
}
}
public DataTable executeSelectQuery(String sql)
{
getConnection();
try
{
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.StoredProcedure;
// Create a DataAdapter to run the command and fill the DataTable
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataTable dt = new DataTable();
da.Fill(dt);
return dt;
}
catch (Exception e)
{
throw e;
}
finally
{
connection.Close();
}
}
public void executeUpdateQuery(String sql)
{
getConnection();
try
{
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.StoredProcedure;
cmd.ExecuteNonQuery();
}
catch (Exception e)
{
throw e;
}
finally
{
connection.Close();
}
}
}
我的数据库类的这些方法是为通用而创建的,用于所有的选择和更新事务,但是将这些参数添加到类本身确实使它特定于该事务,对吗?我可以在表单加载事件中添加参数吗?
现在在我的WinForm Load事件中,我通过存储过程填充数据网格,但我需要传递@cusid给它。代码如下所示,我得到一个错误,说"过程或函数'spCustomerParam'期望参数'@cusid',这是没有提供的。"
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = Program.db.executeSelectQuery("spCustomerParam");
dataGridView1.DataSource = dt;
}
您可以通过添加:
将参数传递给存储过程cmd.Parameters.AddWithValue(“@Name”, value);
所以你的代码可以通过添加默认值的parameters
参数来扩展(以保持向后能力):
public DataTable executeSelectQuery(String sql, Dictionary<String,String> parameters = null)
{
getConnection();
try
{
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.StoredProcedure;
if (parameters != null)
{
foreach (var param in parameters)
{
cmd.Parameters.AddWithValue("@"+param.Key, param.Value);
}
}
// Create a DataAdapter to run the command and fill the DataTable
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataTable dt = new DataTable();
da.Fill(dt);
return dt;
}
catch (Exception e)
{
throw e;
}
finally
{
connection.Close();
}
}
和电话:
private void Form1_Load(object sender, EventArgs e)
{
var parameters = new Dictionary<String, String>() {{"param1", "paramValue1"}, {"param2", "paramValue2"}};
DataTable dt = Program.db.executeSelectQuery("spCustomerParam", parameters);
dataGridView1.DataSource = dt;
}
链接:如何调用具有输出参数的存储过程?