我試圖在數據網格視圖中獲取數據。此代碼工作正常,如果我用這個查詢: - 「選擇從employee.transaction *」數據網格視圖不顯示來自mysql表的數據
但是當我嘗試把它不給任何輸出條件(只顯示一個空白表)
我的表有使用mysql服務器的月,年類型Int.Im的列5.6.25
我無法找到與我的代碼的問題。請提前help.Thx。
private void load_data_Click(object sender, EventArgs e)
{
string constring = "datasource = localhost;port = 3306;username = ****;password = ****";
MySqlConnection conDataBase = new MySqlConnection(constring);
var cmdDataBase = conDataBase.CreateCommand();
cmdDataBase.CommandText = @"select * from employee.transaction where department = @department AND month = @month AND year = @year";
cmdDataBase.Parameters.AddWithValue("@department", this.department.Text);
cmdDataBase.Parameters.AddWithValue("@month", this.dateTimePicker1.Value.Month);
cmdDataBase.Parameters.AddWithValue("@year", this.dateTimePicker1.Value.Year);
try
{
// here im trying to show table in datagrid view
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmdDataBase;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
BindingSource bSource = new BindingSource();
bSource.DataSource = dbdataset;
dataGridView1.DataSource = bSource;
sda.Update(dbdataset);
//here im trying to make a excel file which would contain what is currently being displayed in the datagrid view
DataSet ds = new DataSet("New_DataSet");
DataTable dt = new DataTable("New_DataTable");
dt.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;
ds.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;
ds.Tables.Add(dbdataset);
ExcelLibrary.DataSetHelper.CreateWorkbook("MyExcelFile.xls", ds);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
你的數據確實存在嗎? – Drew
您是否嘗試使用調試器逐句通過此代碼?調用填充後,dbdataset表中的行數是多少?如果它是零,那麼你的查詢有問題。嘗試在MySql Workbench中使用相同的值運行它 – Steve
請不要保存這樣的日期數據 – Drew