9、员工的复合查询与NPOI导出Excel

1、基础框架准备工作

同6、员工档案管理

3、DAL层建立EmployeeDAL的类添加Search方法

public Employee[] Search(string sql,List<SqlParameter> parameter)
{
DataTable dt =  SqlHelper.ExecuteDataTable(sql,parameter.ToArray());
Employee[] empl = new Employee[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
empl[i] = ToEmployee(dt.Rows[i]);
}
return empl;
}

4、EmployeeListUI界面添加GroupBox 搜索Box。

4.1 ListUI

<GroupBox Header="搜索" Height="100" DockPanel.Dock="Top">
<Grid>
<CheckBox Name="cbSearchByName" Content="姓名" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,0,0,0"/>
<TextBox Name="txtName" HorizontalAlignment="Left" Height="24" Margin="57,-4,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="120"/>
<CheckBox Name="cbSearchByInDate" Content="入职时间" HorizontalAlignment="Left" Margin="219,0,0,0" VerticalAlignment="Top"/>
<DatePicker Name="dpInDateStart" HorizontalAlignment="Left" Margin="302,-4,0,0" VerticalAlignment="Top"/>
<TextBlock HorizontalAlignment="Left" Margin="389,0,0,0" TextWrapping="Wrap" Text="至" VerticalAlignment="Top"/>
<DatePicker Name="dpInDateEnd" HorizontalAlignment="Left" Margin="415,-4,0,0" VerticalAlignment="Top"/>
<CheckBox Name="cbSearchByDept" Content="部门"  HorizontalAlignment="Left" Margin="10,37,0,0" VerticalAlignment="Top"/>
<ComboBox Name="cmbDept" DisplayMemberPath="Name" SelectedValuePath="Id"  HorizontalAlignment="Left" Margin="57,34,0,0" VerticalAlignment="Top" Width="120"/>
<Button Content="查询" Name="btnSearch" HorizontalAlignment="Left" Margin="521,34,0,0" VerticalAlignment="Top" Width="75" Click="btnSearch_Click" RenderTransformOrigin="1.187,0.545"/>
<CheckBox x:Name="cbSearchByBaseSalary" Content="基本工资" HorizontalAlignment="Left" Margin="219,37,0,0" VerticalAlignment="Top"/>
<TextBox x:Name="cbBaseSalarEnd" HorizontalAlignment="Left" Height="23" Margin="415,33,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="82"/>
<TextBlock HorizontalAlignment="Left" Margin="389,36,0,0" TextWrapping="Wrap" Text="---" VerticalAlignment="Top"/>
<TextBox x:Name="cbBaseSalarStart" HorizontalAlignment="Left" Height="23" Margin="302,33,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="82"/>

</Grid>
</GroupBox>

4.2 查询交互
UI层第一次需要引用Model与DAL

namespace HRMSys.UI.SystemMgr
{
/// <summary>
/// EmployeeListUI.xaml 的交互逻辑
/// </summary>
public partial class EmployeeListUI : Window
{
public EmployeeListUI()
{
InitializeComponent();
}

private void btnAdd_Click(object sender, RoutedEventArgs e)
{
//新增按钮
EmployeeEditUI edit = new EmployeeEditUI();
edit.IsAddNew = true;
if (edit.ShowDialog() == true)
{
LoadData();
}
}

private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
//column中的部门与学历
columnDepartmentId.ItemsSource = new DepartmentDAL().ListAll();
columnEducationId.ItemsSource = new IdNameDAL().GetByCategory("学历");

LoadData();

cbSearchByName.IsChecked = true;
cbSearchByDept.IsChecked = true;
cbSearchByBaseSalary.IsChecked = true;
dpInDateStart.SelectedDate = DateTime.Today.AddMonths(-1);
dpInDateEnd.SelectedDate = DateTime.Today;

cmbDept.ItemsSource = new DepartmentDAL().ListAll();

}
private void LoadData()
{
gridEmployee.ItemsSource = new EmployeeDAL().ListAll();

}

private void bthDelete_Click(object sender, RoutedEventArgs e)
{
Employee empl = (Employee)gridEmployee.SelectedItem;
if (empl == null)
{
MessageBox.Show("没有选中任何数据");
return;
}
else if (MessageBox.Show("你真的要删除吗", "警告", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
{
new EmployeeDAL().Deletet(empl.Id);
LoadData();
}
}

private void btnEdit_Click(object sender, RoutedEventArgs e)
{
Employee empl = (Employee)gridEmployee.SelectedItem;
if (empl == null)
{
MessageBox.Show("你没有选择任何行！");
return;
}
EmployeeEditUI edit = new EmployeeEditUI();
edit.EditingId = empl.Id;
edit.IsAddNew = false;
if (edit.ShowDialog() == true)
{
LoadData();
}

}

private void btnSearch_Click(object sender, RoutedEventArgs e)
{

//搜索
List<string> whereList = new List<string>();
List<SqlParameter> parameter = new List<SqlParameter>();
if (cbSearchByName.IsChecked == true)
{
whereList.Add("Name=@Name");
parameter.Add(new SqlParameter("@Name",txtName.Text));
}
if (cbSearchByInDate.IsChecked == true)
{
whereList.Add("InDate>=@InDateStart and InDate<=@InDateEnd");
parameter.Add(new SqlParameter("@InDateStart", dpInDateStart.SelectedDate));
parameter.Add(new SqlParameter("@InDateEnd", dpInDateEnd.SelectedDate));
}
if (cbSearchByDept.IsChecked == true)
{
whereList.Add("DepartmentId=@DepartmentId");
parameter.Add(new SqlParameter("@DepartmentId", cmbDept.SelectedValue));
}
if (cbSearchByBaseSalary.IsChecked == true)
{
whereList.Add("BaseSalary>=@BaseSalaryStart and BaseSalary<@BaseSalaryEnd");
parameter.Add(new SqlParameter("@BaseSalaryStart", cbBaseSalarStart.Text));
parameter.Add(new SqlParameter("@BaseSalaryEnd", cbBaseSalarEnd.Text));
}
string whereSql = string.Join(" and ",whereList);
string sql = "select * from T_Employee";
if (whereSql.Length > 0)
{
sql = sql + " where " + whereSql;
}
Employee[] result = new EmployeeDAL().Search(sql, parameter);
gridEmployee.ItemsSource = result;
}

private void btExport_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog sdfExport = new SaveFileDialog();
sdfExport.Filter = "Excel文件|*.xls";
if (sdfExport.ShowDialog() != true)
{
return;
}
string filename = sdfExport.FileName;
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("员工数据");

IRow rowHeader = sheet.CreateRow(0);//表头行
rowHeader.CreateCell(0, CellType.STRING).SetCellValue("姓名");
rowHeader.CreateCell(1, CellType.STRING).SetCellValue("工号");
rowHeader.CreateCell(2, CellType.STRING).SetCellValue("入职日期");

//把查询结果导出到Excel
Employee[] employees = (Employee[])gridEmployee.ItemsSource;
for (int i = 0; i < employees.Length; i++)
{
Employee employee = employees[i];
IRow row = sheet.CreateRow(i + 1);
row.CreateCell(0, CellType.STRING).SetCellValue(employee.Name);
row.CreateCell(1, CellType.STRING).SetCellValue(employee.Number);

ICellStyle styledate = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
//格式具体有哪些请看单元格右键中的格式，有说明
styledate.DataFormat = format.GetFormat("yyyy\"年\"m\"月\"d\"日\"");

ICell cellInDate = row.CreateCell(2, CellType.NUMERIC);
cellInDate.CellStyle = styledate;
cellInDate.SetCellValue(employee.InDate);
}

using (Stream stream = File.OpenWrite(filename))
{
workbook.Write(stream);
}
}
}
}

5、NOPI下载与引用

NOPI下载，在VS用新将两个dll文件引用。