c# - 如何使用 SQL 查询 DataGridView？

Question

我需要DataGridView使用 SQL 查询但不显示到DataGridView.

public chkTime()
{
    InitializeComponent();
}

HRTaffDataContext db = new HRTaffDataContext();
SqlConnection Conn;
SqlCommand cmd = new SqlCommand();
SqlDataAdapter da;
DataTable dt = new DataTable();
DataSet ds = new DataSet();
StringBuilder sb = new StringBuilder();
string appConn = ConfigurationManager.ConnectionStrings["connDB"].ConnectionString;
string strDate;

private void chkTime_Load(object sender, EventArgs e)
{
    connStr();
    return;
}

public void connStr()
{
    Conn = new SqlConnection();
    if (Conn.State == ConnectionState.Open)
    {
        Conn.Close();
    }
    Conn.ConnectionString = appConn;
    Conn.Open();
}

private void button2_Click(object sender, EventArgs e)
{
    SqlConnection conn = new SqlConnection(appConn);

    string sql = "SELECT [filesTA].EmpNo,[Employee].[First Name],[filesTA].ChkDate,[filesTA].ChkIn,[filesTA].ChkOut,[CompanyData].ShortName"
    + " From [WebSP].[dbo].[filesTA] inner join [WebSP].[dbo].[Employee] on [Employee].EmployeeNo=[filesTA].EmpNo INNER JOIN [WebSP].[dbo].[CompanyData] On [CompanyData].Company = [Employee].Company"
    + " WHERE [filesTA].ErrorCode = 0"; // It's work
    + " WHERE [filesTA].ErrorCode = 0 and [filesTA].ChkDate ='" + dateTimePicker.Text.ToString() + "'";

    da = new SqlDataAdapter(sql, Conn);
    DataSet ds = new DataSet();
    da.Fill(ds);
    Conn.Close();

    dgvShow.DataSource = ds.Tables[0];
}

• "WHERE [filesTA].ErrorCode = 0"工作正常。

• "WHERE [filesTA].ErrorCode = 0 and [filesTA].ChkDate ='" + dateTimePicker.Text.ToString() + "'"不起作用。

我需要设置 where DateTime。

Answer 1

$dateTimePicker.Text 返回一个供人类阅读的字符串，您的服务器可能不喜欢它。

尝试类似：

string sql = string.Format("SELECT [filesTA].EmpNo,[Employee].[First Name],[filesTA].ChkDate,[filesTA].ChkIn,[filesTA].ChkOut,[CompanyData].ShortName"
            + " From [WebSP].[dbo].[filesTA] inner join [WebSP].[dbo].[Employee] on [Employee].EmployeeNo=[filesTA].EmpNo INNER JOIN [WebSP].[dbo].[CompanyData] On [CompanyData].Company = [Employee].Company"
            + " WHERE [filesTA].ErrorCode = 0 and [filesTA].ChkDate ='{0}-{1}-{2}'",
                dateTimePicker.Value.Year,
                dateTimePicker.Value.Month,
                dateTimePicker.Value.Day);

Answer 2

您需要使用dateTimePicker.Value.ToString()而不是dateTimePicker.Text.ToString()

使用它的一个简单示例可以是dateTimePicker.Value.ToString("yyyy-MM-dd")