使用Sqlite+sqlsugar+NPOI对Excel增删改查,一对多查询
Excel, ppt, Word 都属于微软的产品, 大多用在Windows操作系统. 对Excel的高级操作, 特别是连表操作, 大多数人会用VBA. 然而VBA是20年前的产物, VB语言也在十几年前停止了维护, 连他的儿子VB.Net 也在去年停止了维护, VB可以说已经寿终正寝了. 对于VBA, 微软也有以C# 为开发语言的VSTO作为替代.
微软主推的编程语言是C# . C# 是完全的面向对象的语言, 也可以与C++联合编程, 也可以启动Unsafe模式操作指针, 和Java有90%的语法相似度. C# 不仅可以做Web, 硬件, 桌面, 做很多小工具也效果拔群, 今天我就来教大家如何用Windows窗体 做一个 Excel 一对多, 联表查询的案例.
1, 需求:
现在有2个表
表1:
表2:
现在有6名选手参加了电子竞技比赛, 有人夺冠, 有人落榜. 现在要根据表2中是否夺冠, 筛选出表1中的夺冠选手的信息.
如果用VBA, 势必要写Sql语句, 各种内连接, 外连接, 说实话复杂的sql语句我也不会. 但是C# 下有很多非常好用的ORM, 比如sqlsugar, 就是一款轻量级的ORM, 只需要linq, 按几下tab 就出来查询结果了.
在这里我用Windows窗体做了一个小程序, 我会在稍后放在某度网盘分享给大家.
2, 思路:
使用NPOI将 Excel以DataTable的格式读入winform
使用sqlsugar 使用codeFirst生成数据库(sqlite是轻量级数据库,几Kb且无需安装)
使用sqlsugar将Excel的数据存入sqlite.
使用hasmap/dictionary生成外键
使用sqlsugar进行一对多查询
使用NPOI将查询的结果导出到excel
关键Nuget包: System.Sqlite, sqlsugar, NPOI, Newtonsoft.Json
过程:
选择Excel的Sheet数量(我是2个Sheet), 点击生成数据库
点击读取Excel(此时需要关闭你需要导入的Excel)
选中, 提示导入成功
点击插入数据库
点击生成外键:
可以看到外键生成成功了
点击一对多查询, 右边的DateGridView已经显示出筛选结果了, 获奖的选手只有4位.
导出到Excel
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class SqlSugarHelper
{
public static string ConnectionString = string.Empty; //必填, 数据库连接字符串
public static SqlSugarClient db
{
get => new SqlSugarClient(new ConnectionConfig()
{
ConnectionString = ConnectionString,
DbType = DbType.Sqlite, //必填, 数据库类型
IsAutoCloseConnection = true, //默认false, 时候知道关闭数据库连接, 设置为true无需使用using或者Close操作
InitKeyType = InitKeyType.Attribute //默认SystemTable, codefist需要使用Attribute
});
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class SqlSugarService
{
/// using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class ExcelHelper
{
/// 导入数据行数(包含列名那一行)
public int DataTableToExcel(DataTable data, string sheetName, string fileName, bool isColumnWritten)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;
IWorkbook workbook = null;
using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook();
else if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook();
try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -1;
}
if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}
for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
workbook.Write(fs); //写入到excel
return count;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -1;
}
}
}
private static DataTable BuildDataTable(IRow Row)
{
DataTable result = null;
if (Row.Cells.Count > 0)
{
result = new DataTable();
for (int i = 0; i < Row.LastCellNum; i++)
{
if (Row.GetCell(i) != null)
{
result.Columns.Add(Row.GetCell(i).ToString());
}
}
}
return result;
}
/// using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class Champion
{
[SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "序号")]
public int Id { get; set; }
[SugarColumn(ColumnName = "夺冠项目")]
public string Game { get; set; }
[SugarColumn(ColumnName = "姓名")]//数据库与实体不一样设置列名
public string Name { get; set; }
[SugarColumn(ColumnName = "外键")]
public int PlayerId { get; set; }
[SugarColumn(IsIgnore = true)]
public Player Player { get; set; }
}
}
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class Player
{
[SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "序号")]
public int Id { get; set; }
[SugarColumn(ColumnName = "姓名")]//数据库与实体不一样设置列名
public string Name { get; set; }
[SugarColumn(ColumnName = "学号")]
public string Identity { get; set; }
[SugarColumn(ColumnName = "家庭住址")]
public string Adress { get; set; }
[SugarColumn(IsIgnore = true)]
public List<Champion> Champions { get; set; } = new List<Champion>();
}
}
using SqlSugar;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NPOIDemon
{
//sqlsugar文档
//https://www.donet5.com/home/Doc?typeId=1226
public partial class FrmMain : Form
{
public FrmMain()
{
InitializeComponent();
this.Load += FrmMain_Load;
}
private void FrmMain_Load(object sender, EventArgs e)
{
SqlSugarService.SetConnectionStr("Data Source="+Application.StartupPath + str2);
for (int i = 1; i < 11; i++)
{
cmb1.Items.Add(i);
}
}
private string str2 = "\\Test.db;Pooling=true;FailIfMissing=false";
private List<DataTable> dt =new List<DataTable>();
private int num;
private DataTable dtout;
private void btn1_Click(object sender, EventArgs e)
{
ExcelHelper helper = new ExcelHelper();
OpenFileDialog ofd = new OpenFileDialog();
num = int.Parse(cmb1.Text);
if (ofd.ShowDialog() == DialogResult.OK)
{
for (int i = 0; i < num; i++)
{
string filePath = ofd.FileName;
//dt = helper.ReadFromExcel(filePath);
DataTable dt1 = helper.ReadFromExcelBySheetNum(filePath, i);
dt.Add(dt1);
}
}
if (dt.Count==num)
{
MessageBox.Show("导入成功！");
}
else
{
MessageBox.Show("导入失败！");
}
}
//Excel插入数据库
private void btnInsert_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
List<Dictionary<string, object>> dc1 = Db.Utilities.DataTableToDictionaryList(dt[0]);//0,1,2依次往后排
Db.Insertable(dc1).AS("Player").ExecuteReturnIdentity();
List<Dictionary<string, object>> dc2 = Db.Utilities.DataTableToDictionaryList(dt[1]);//5.0.23版本支持
Db.Insertable(dc2).AS("Champion").ExecuteReturnIdentity();
//Db.Fastest().AS("Package").BulkCopy("Package", dt);
//Db.Insertable(dc).AS("Package").ExecuteReturnIdentity();
MessageBox.Show("插入成功!");
}
private void Create_Click(object sender, EventArgs e)
{
CodeFist
SqlSugarClient Db = SqlSugarHelper.db;
Db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(Player));
Db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(Champion));
bool t = File.Exists(Application.StartupPath + @"/Test.db");
if (t) //File.Exists, 文件， Directory.Exists 文件夹
{
MessageBox.Show("数据库生成成功！");
}
else
{
MessageBox.Show("数据库生成失败！");
}
}
//一对多查询
private void ManyToOne_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
//多表查询
//需要注意的是，这两个是固定写法。
//子对象，主表关联字段，从表关联字段,有外键关联可以省略主表关联字段
//Expression> mapperObject, Expression> mainField, Expression> childField
//对子对象过滤
//var list = Db.Queryable()
// .Mapper(p => p.Champions, p => p.Name, p => p.Champions.First().Name)
// .Mapper(p =>
// {
// p.Champions = p.Champions.Where(c => c.Name == "黄慧明").ToList();
// }).ToList();
dtout = Db.Queryable<Player>()
.Mapper(p => p.Champions, p => p.Champions.First().PlayerId)
.Where(p => p.Champions.Count()>0)
.ToDataTable(); //或者ToList
//var list = Db.Queryable().Where(x => x.Id == 1).ToList();
dataGridView1.DataSource = dtout;
}
//生成外键
private void btnGKey_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
List<Player> players = Db.Queryable<Player>().ToList();
List<Champion> champions = Db.Queryable<Champion>().ToList();
Dictionary<string, int> t1 = new Dictionary<string, int>();
foreach (var item in players)
{
t1.Add(item.Name, item.Id);
}
foreach (var item in champions)
{
if (t1.ContainsKey(item.Name))
{
item.PlayerId = t1[item.Name];
}
}
Db.Updateable(champions).ExecuteCommand();
MessageBox.Show("更新外键成功!");
}
private void export_Click(object sender, EventArgs e)
{
FolderBrowserDialog folder = new FolderBrowserDialog();
if (folder.ShowDialog() == DialogResult.OK)
{
string dir = folder.SelectedPath + "\\数据导出" + DateTime.Now.ToString("yyyy-mm-dd-hh-mm") + ".xlsx";
ExcelHelper helper = new ExcelHelper();
int i = helper.DataTableToExcel(dtout, "测试", dir, true);
MessageBox.Show(i.ToString());
}
}
}
}
SQLsugar新语法:
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class Champion
{
[SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "序号")]
public int Id { get; set; }
[SugarColumn(ColumnName = "夺冠项目")]
public string 夺冠项目 { get; set; }
[SugarColumn(ColumnName = "姓名")]//数据库与实体不一样设置列名
public string Name { get; set; }
[SugarColumn(ColumnName = "外键")]
public int PlayerId { get; set; }
//[SugarColumn(IsIgnore = true)]
//public Player Player { get; set; }
}
}
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NPOIDemon
{
public class Player
{
[SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "序号")]
public int Id { get; set; }
[SugarColumn(ColumnName = "姓名")]//数据库与实体不一样设置列名
public string Name { get; set; }
[SugarColumn(ColumnName = "学号")]
public string Identity { get; set; }
[SugarColumn(ColumnName = "家庭住址")]
public string Adress { get; set; }
//[SugarColumn(IsIgnore = true)]
[Navigate(NavigateType.OneToMany, nameof(Champion.PlayerId))]
public List<Champion> Champions { get; set; }= new List<Champion>();
}
}
using SqlSugar;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NPOIDemon
{
//sqlsugar文档
//https://www.donet5.com/home/Doc?typeId=1226
public partial class FrmMain : Form
{
public FrmMain()
{
InitializeComponent();
this.Load += FrmMain_Load;
}
private void FrmMain_Load(object sender, EventArgs e)
{
SqlSugarService.SetConnectionStr("Data Source="+Application.StartupPath + str2);
for (int i = 1; i < 11; i++)
{
cmb1.Items.Add(i);
}
}
private string str2 = "\\Test.db;Pooling=true;FailIfMissing=false";
private List<DataTable> dt =new List<DataTable>();
private int num;
private DataTable dtout;
private void btn1_Click(object sender, EventArgs e)
{
ExcelHelper helper = new ExcelHelper();
OpenFileDialog ofd = new OpenFileDialog();
num = int.Parse(cmb1.Text);
if (ofd.ShowDialog() == DialogResult.OK)
{
for (int i = 0; i < num; i++)
{
string filePath = ofd.FileName;
//dt = helper.ReadFromExcel(filePath);
DataTable dt1 = helper.ReadFromExcelBySheetNum(filePath, i);
dt.Add(dt1);
}
}
if (dt.Count==num)
{
MessageBox.Show("导入成功！");
}
else
{
MessageBox.Show("导入失败！");
}
}
//Excel插入数据库
private void btnInsert_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
List<Dictionary<string, object>> dc1 = Db.Utilities.DataTableToDictionaryList(dt[0]);//0,1,2依次往后排
Db.Insertable(dc1).AS("Player").ExecuteReturnIdentity();
List<Dictionary<string, object>> dc2 = Db.Utilities.DataTableToDictionaryList(dt[1]);//5.0.23版本支持
Db.Insertable(dc2).AS("Champion").ExecuteReturnIdentity();
//Db.Fastest().AS("Package").BulkCopy("Package", dt);
//Db.Insertable(dc).AS("Package").ExecuteReturnIdentity();
MessageBox.Show("插入成功!");
}
private void Create_Click(object sender, EventArgs e)
{
CodeFist
SqlSugarClient Db = SqlSugarHelper.db;
Db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(Player));
Db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(Champion));
bool t = File.Exists(Application.StartupPath + @"/Test.db");
if (t) //File.Exists, 文件， Directory.Exists 文件夹
{
MessageBox.Show("数据库生成成功！");
}
else
{
MessageBox.Show("数据库生成失败！");
}
}
//一对多查询
private void ManyToOne_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
//多表查询
//需要注意的是，这两个是固定写法。
//子对象，主表关联字段，从表关联字段,有外键关联可以省略主表关联字段
//Expression> mapperObject, Expression> mainField, Expression> childField
//对子对象过滤
//var list = Db.Queryable()
// .Mapper(p => p.Champions, p => p.Name, p => p.Champions.First().Name)
// .Mapper(p =>
// {
// p.Champions = p.Champions.Where(c => c.Name == "黄慧明").ToList();
// }).ToList();
//dtout = Db.Queryable()
// .Mapper(p => p.Champions, p => p.Champions.First().PlayerId)
// .Mapper(p => { p.Champions = p.Champions.Where(p=>p.Game.Contains("魔兽争霸")).ToList(})
// .Where(p => p.Champions.Count()>1)
// .ToDataTable(); //或者ToList
dtout = Db.Queryable<Player>()
.Includes(p => p.Champions)
.Where(p=>p.Champions.Count()>1)
.Where(p => p.Champions.Any(z => z.夺冠项目.Contains("魔兽")))
.ToDataTable();
//var list = Db.Queryable().Where(x => x.Id == 1).ToList();
dataGridView1.DataSource = dtout;
}
//生成外键
private void btnGKey_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
List<Player> players = Db.Queryable<Player>().ToList();
List<Champion> champions = Db.Queryable<Champion>().ToList();
Dictionary<string, int> t1 = new Dictionary<string, int>();
foreach (var item in players)
{
t1.Add(item.Name, item.Id);
}
foreach (var item in champions)
{
if (t1.ContainsKey(item.Name))
{
item.PlayerId = t1[item.Name];
}
}
Db.Updateable(champions).ExecuteCommand();
MessageBox.Show("更新外键成功!");
}
private void export_Click(object sender, EventArgs e)
{
FolderBrowserDialog folder = new FolderBrowserDialog();
if (folder.ShowDialog() == DialogResult.OK)
{
string dir = folder.SelectedPath + "\\数据导出" + DateTime.Now.ToString("yyyy-mm-dd-hh-mm") + ".xlsx";
ExcelHelper helper = new ExcelHelper();
int i = helper.DataTableToExcel(dtout, "测试", dir, true);
MessageBox.Show(i.ToString());
}
}
}
}
多级查询
using SqlSugar;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NPOIDemon
{
//sqlsugar文档
//https://www.donet5.com/home/Doc?typeId=1226
public partial class FrmMain : Form
{
public FrmMain()
{
InitializeComponent();
this.Load += FrmMain_Load;
}
private void FrmMain_Load(object sender, EventArgs e)
{
SqlSugarService.SetConnectionStr("Data Source="+Application.StartupPath + str2);
for (int i = 1; i < 11; i++)
{
cmb1.Items.Add(i);
}
}
private string str2 = "\\Test.db;Pooling=true;FailIfMissing=false";
private List<DataTable> dt =new List<DataTable>();
private int num;
private DataTable dtout;
private void btn1_Click(object sender, EventArgs e)
{
ExcelHelper helper = new ExcelHelper();
OpenFileDialog ofd = new OpenFileDialog();
num = int.Parse(cmb1.Text);
if (ofd.ShowDialog() == DialogResult.OK)
{
for (int i = 0; i < num; i++)
{
string filePath = ofd.FileName;
//dt = helper.ReadFromExcel(filePath);
DataTable dt1 = helper.ReadFromExcelBySheetNum(filePath, i);
dt.Add(dt1);
}
}
if (dt.Count==num)
{
MessageBox.Show("导入成功！");
}
else
{
MessageBox.Show("导入失败！");
}
}
//Excel插入数据库
private void btnInsert_Click(object sender, EventArgs e)
{
SqlSugarClient db = SqlSugarHelper.db;
db.Insertable(new RoomA() { RoomId = 1, RoomName = "北大001室", SchoolId = 1 }).ExecuteCommand();
db.Insertable(new RoomA() { RoomId = 2, RoomName = "北大002室", SchoolId = 1 }).ExecuteCommand();
db.Insertable(new RoomA() { RoomId = 3, RoomName = "北大003室", SchoolId = 1 }).ExecuteCommand();
db.Insertable(new RoomA() { RoomId = 4, RoomName = "清华001厅", SchoolId = 2 }).ExecuteCommand();
db.Insertable(new RoomA() { RoomId = 5, RoomName = "清华002厅", SchoolId = 2 }).ExecuteCommand();
db.Insertable(new RoomA() { RoomId = 6, RoomName = "清华003厅", SchoolId = 2 }).ExecuteCommand();
db.Insertable(new SchoolA() { SchoolId = 1, SchoolName = "北大" }).ExecuteCommand();
db.Insertable(new SchoolA() { SchoolId = 2, SchoolName = "清华" }).ExecuteCommand();
db.Insertable(new StudentA() { StudentId = 1, SchoolId = 1, Name = "北大jack" }).ExecuteCommand();
db.Insertable(new StudentA() { StudentId = 2, SchoolId = 1, Name = "北大tom" }).ExecuteCommand();
db.Insertable(new StudentA() { StudentId = 3, SchoolId = 2, Name = "清华jack" }).ExecuteCommand();
db.Insertable(new StudentA() { StudentId = 4, SchoolId = 2, Name = "清华tom" }).ExecuteCommand();
db.Insertable(new TeacherA() { SchoolId = 1, Id = 1, Name = "北大老师01" }).ExecuteCommand();
db.Insertable(new TeacherA() { SchoolId = 1, Id = 2, Name = "北大老师02" }).ExecuteCommand();
db.Insertable(new TeacherA() { SchoolId = 2, Id = 3, Name = "清华老师01" }).ExecuteCommand();
db.Insertable(new TeacherA() { SchoolId = 2, Id = 4, Name = "清华老师02" }).ExecuteCommand();
MessageBox.Show("插入成功!");
}
private void Create_Click(object sender, EventArgs e)
{
CodeFist
SqlSugarClient db = SqlSugarHelper.db;
db.CodeFirst.InitTables<StudentA, RoomA, SchoolA, TeacherA>();
db.DbMaintenance.TruncateTable<StudentA>();
db.DbMaintenance.TruncateTable<RoomA>();
db.DbMaintenance.TruncateTable<SchoolA>();
db.DbMaintenance.TruncateTable<TeacherA>();
bool t = File.Exists(Application.StartupPath + @"/Test.db");
if (t) //File.Exists, 文件， Directory.Exists 文件夹
{
MessageBox.Show("数据库生成成功！");
}
else
{
MessageBox.Show("数据库生成失败！");
}
}
//一对多查询
private void ManyToOne_Click(object sender, EventArgs e)
{
SqlSugarClient db = SqlSugarHelper.db;
//var list = db.Queryable().ToList();
//db.ThenMapper(list, stu =>
//{
// //如果加Where不能带有stu参数，stu参数写到 SetContext
// //School表中的主键, sdent表中的外键,student表
// //Expression>
// //thisFiled, Expression> mappingFiled, ParameterT parameter
// stu.SchoolA = db.Queryable().SetContext(scl => scl.SchoolId, () => stu.SchoolId, stu).FirstOrDefault();
// //stu.SchoolA = db.Queryable().SetContext(scl => scl.SchoolId, () => stu.SchoolId, stu).FirstOrDefault();
//});
var treeRoot = db.Queryable<Tree>().Where(it => it.Id == 1).ToList();
//第一层
db.ThenMapper(treeRoot, item =>
{
item.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => item.Id, item).ToList();
});
//第二层
db.ThenMapper(treeRoot.SelectMany(it => it.Child), it =>
{
it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();
});
//第三层
db.ThenMapper(treeRoot.SelectMany(it => it.Child).SelectMany(it => it.Child), it =>
{
it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();
});
//var list = Db.Queryable().Where(x => x.Id == 1).ToList();
dataGridView1.DataSource = treeRoot;
}
//生成外键
private void btnGKey_Click(object sender, EventArgs e)
{
SqlSugarClient Db = SqlSugarHelper.db;
List<Player> players = Db.Queryable<Player>().ToList();
List<Champion> champions = Db.Queryable<Champion>().ToList();
Dictionary<string, int> t1 = new Dictionary<string, int>();
foreach (var item in players)
{
t1.Add(item.Name, item.Id);
}
foreach (var item in champions)
{
if (t1.ContainsKey(item.Name))
{
item.PlayerId = t1[item.Name];
}
}
Db.Updateable(champions).ExecuteCommand();
MessageBox.Show("更新外键成功!");
}
private void export_Click(object sender, EventArgs e)
{
FolderBrowserDialog folder = new FolderBrowserDialog();
if (folder.ShowDialog() == DialogResult.OK)
{
string dir = folder.SelectedPath + "\\数据导出" + DateTime.Now.ToString("yyyy-mm-dd-hh-mm") + ".xlsx";
ExcelHelper helper = new ExcelHelper();
int i = helper.DataTableToExcel(dtout, "测试", dir, true);
MessageBox.Show(i.ToString());
}
}
}
}
链接:https://pan.baidu.com/s/1K79FpFUQ6WlQnLBNuK4exA
提取码:9t8t