我正在尝试将位值(true 或 false)写入我的数据库中一个名为“processed”的字段中。我目前正在尝试通过传入 bool 值来执行此操作,但我收到一条错误消息,提示无法从 varchar 类型转换为 bit。谁能看出我的逻辑是怎么回事?
protected void CheckBoxProcess_CheckedChanged(object sender, EventArgs e)
{
bool update;
bool trueBool = true;
bool falseBool = false;
string checkedString = "UPDATE SecureOrders SET processed = '%" + trueBool + "%' WHERE fName LIKE '%" + DefaultGrid.SelectedRow.Cells[2].Text + "%' AND lName LIKE '% " + DefaultGrid.SelectedRow.Cells[3].Text + "%'";
string uncheckedString = "UPDATE SecureOrders SET processed = '%" + falseBool + "%' WHERE fName LIKE '%" + DefaultGrid.SelectedRow.Cells[2].Text + "%' AND lName LIKE '% " + DefaultGrid.SelectedRow.Cells[3].Text + "%'";
CheckBox cb = (CheckBox)sender;
GridViewRow gvr = (GridViewRow)cb.Parent.Parent;
DefaultGrid.SelectedIndex = gvr.RowIndex;
update = Convert.ToBoolean(DefaultGrid.SelectedValue);
orderByString = orderByList.SelectedItem.Value;
fieldString = searchTextBox.Text;
System.Configuration.ConnectionStringSettings connectionString;
connectionString = rootWebConfig.ConnectionStrings.ConnectionStrings["secureodb"];
// Create an SqlConnection to the database.
using (SqlConnection connection = new SqlConnection(connectionString.ToString()))
{
connection.Open();
SqlCommand checkedCmd = new SqlCommand(checkedString, connection);
SqlCommand uncheckedCmd = new SqlCommand(uncheckedString, connection);
dataAdapter = new SqlDataAdapter("SELECT * FROM SecureOrders", connection);
// create the DataSet
dataSet = new DataSet();
// fill the DataSet using our DataAdapter
dataAdapter.Fill(dataSet, "SecureOrders");
DataView source = new DataView(dataSet.Tables[0]);
DefaultGrid.DataSource = source;
if (cb.Checked == true)
{
checkedCmd.ExecuteNonQuery();
}
else
{
uncheckedCmd.ExecuteNonQuery();
}
connection.Close();
}
}
最佳答案
您需要将位字段设置为1
或0
,具体取决于它是真还是假。
所以:
string checkedString = "UPDATE SecureOrders SET processed = 1 WHERE fName LIKE '%" + DefaultGrid.SelectedRow.Cells[2].Text + "%' AND lName LIKE '% " + DefaultGrid.SelectedRow.Cells[3].Text + "%'";
string uncheckedString = "UPDATE SecureOrders SET processed = 0 WHERE fName LIKE '%" + DefaultGrid.SelectedRow.Cells[2].Text + "%' AND lName LIKE '% " + DefaultGrid.SelectedRow.Cells[3].Text + "%'";
此外,正如评论中提到的,直接从用户输入构建 SQL 语句是成为 SQL 注入(inject)攻击受害者的最简单方法。在这些情况下最好使用参数化查询(甚至存储过程)。
....
string checkedString = "UPDATE SecureOrders SET processed = 1 WHERE fName LIKE @p1 AND lName LIKE @p2";
string uncheckedString = "UPDATE SecureOrders SET processed = 0 WHERE fName LIKE @p1 AND lName LIKE @p2";
然后您可以创建参数以传递给您的 ExecuteNonQuery
调用
SqlParameter p1 = new SqlParameter("@p1",SqlDbType.Varchar) { Value = string.Format("%{0}%",DefaultGrid.SelectedRow.Cells[2].Text) };
SqlParameter p2 = new SqlParameter("@p2",SqlDbType.Varchar) { Value = string.Format("%{0}%",DefaultGrid.SelectedRow.Cells[3].Text) };
if (cb.Checked == true)
{
checkedCmd.Parameters.Add(p1);
checkedCmd.Parameters.Add(p2);
checkedCmd.ExecuteNonQuery();
}
else
{
uncheckedCmd.Parameters.Add(p1);
uncheckedCmd.Parameters.Add(p2);
uncheckedCmd.ExecuteNonQuery();
}
关于c# - 将位值写入数据库,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6667004/