C# Winform 使用SUM CASE WHEN实现动态列交叉数据报表

  C# Winform 使用SUM CASE WHEN实现动态列交叉数据报表

使用SUM CASE WHEN实现动态列交叉报表

a) 根据查询条件返回不同字段的结果数据。

b) 根据查询条件自动创建表格的列。

---

1. 按年度生成动态列的SQL脚本

SQL Code:

SELECT Account,OperationType,
SUM(CASE WHEN YEAR(OperationTime)=2015 THEN 1 ELSE 0 END) AS Y2015,
SUM(CASE WHEN YEAR(OperationTime)= 2016 THEN 1 ELSE 0 END) AS Y2016,
SUM(CASE WHEN YEAR(OperationTime)= 2017 THEN 1 ELSE 0 END) AS Y2017,
SUM(CASE WHEN YEAR(OperationTime)= 2018 THEN 1 ELSE 0 END) AS Y2018,
SUM(CASE WHEN YEAR(OperationTime)= 2019 THEN 1 ELSE 0 END) AS Y2019,
SUM(CASE WHEN YEAR(OperationTime)= 2020 THEN 1 ELSE 0 END) AS Y2020,
SUM(CASE WHEN YEAR(OperationTime)= 2021 THEN 1 ELSE 0 END) AS Y2021
FROM sys_LogOperation
GROUP BY Account,OperationType;

//来源:C/S框架网 | www.csframework.com | QQ:23404761

2. 按固定项目生成动态列的SQL脚本

SQL Code:

SELECT YEAR(OperationTime) AS YearItem,
SUM(CASE WHEN OperationType = 'OpenForm' THEN 1 ELSE 0 END) AS OpenForm,
SUM(CASE WHEN OperationType = 'Exception' THEN 1 ELSE 0 END) AS Exception,
SUM(CASE WHEN OperationType = 'CustomError' THEN 1 ELSE 0 END) AS CustomError
FROM sys_LogOperation
GROUP BY YEAR(OperationTime);

//来源:C/S框架网 | www.csframework.com | QQ:23404761

3. 界面设计参考

4. 查询结果，动态创建列

---

C# Code:

/// <summary>
/// 动态窗体GridColumn实例
/// </summary>
/// <param name="years"></param>
private void CreateDynamicColumns(string[] years)
{
  //清除所有列
   gridView1.Columns.Clear();
  
  //添加默认列OperationType,Account,左侧固定
   gridView1.Columns.Add(colAccount);
  gridView1.Columns.Add(colType);
  
  colAccount.VisibleIndex = 0;
  colType.VisibleIndex = 1;
  
  int v = 2;
  foreach (var year in years)
  {
    GridColumn col = new GridColumn();
    col.Name = "col" + year;
    col.Caption = year;
    col.FieldName = "Y" + year;//字段名
     col.Width = 100;
    col.SummaryItem.SummaryType = DevExpress.Data.SummaryItemType.Sum;//数字合计
     col.VisibleIndex = v;
    col.Visible = true;
    gridView1.Columns.Add(col);
    v++;
  }
  
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

5. 演示界面源码位置

CSFrameworkV5-ClientFoundation

\CSFrameworkV5.Report.frmDynamicReport

6. DAL层源码

C# Code:

public DataSet GetDynamicReport(string[] years)
{
  //组合SQL1
   StringBuilder sb = new StringBuilder();
  sb.AppendLine($"SELECT Account,OperationType, ");
  for (int i = 0; i <= years.Length - 1; i++)
  {
    string year = years[i].Trim();//必须去空格!
     string item = $" SUM(CASE WHEN YEAR(OperationTime)={year} THEN 1 ELSE 0 END) AS Y{year} ";
    if (i < years.Length - 1) item += ", ";
    sb.AppendLine(item);
  }
  
  sb.AppendLine("FROM sys_LogOperation ");
  sb.AppendLine("GROUP BY Account,OperationType; ");
  string sql1 = sb.ToString();
  
  //组合SQL2
   string sql2 = "SELECT YEAR(OperationTime) AS YearItem, " +
  " SUM(CASE WHEN OperationType = 'OpenForm' THEN 1 ELSE 0 END) AS OpenForm, " +
  " SUM(CASE WHEN OperationType = 'Exception' THEN 1 ELSE 0 END) AS Exception, " +
  " SUM(CASE WHEN OperationType = 'CustomError' THEN 1 ELSE 0 END) AS CustomError " +
  "FROM sys_LogOperation " +
  "GROUP BY YEAR(OperationTime); ";
  
  DataSet ds = DatabaseProvider.SystemDatabase.GetDataSet(sql1 + sql2);
  return ds;
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

---

扫一扫加作者微信