C#操作Excel数据增删改查(转)

C#操作Excel数据增删改查。

首先创建ExcelDB.xlsx文件，并添加两张工作表。

工作表1：

UserInfo表，字段：UserId、UserName、Age、Address、CreateTime。

工作表2：

Order表，字段：OrderNo、ProductName、Quantity、Money、SaleDate。

1、创建ExcelHelper.cs类，Excel文件处理类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data;  namespace MyStudy.DAL
{  /// <summary>  /// Excel文件处理类  /// </summary>  public class ExcelHelper  {  private static string fileName = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/ExcelFile/ExcelDB.xlsx";  private static OleDbConnection connection;  public static OleDbConnection Connection  {  get  {  string connectionString = "";  string fileType = System.IO.Path.GetExtension(fileName);  if (string.IsNullOrEmpty(fileType)) return null;  if (fileType == ".xls")  {  connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=2\"";  }  else  {  connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=2\"";  }  if (connection == null)  {  connection = new OleDbConnection(connectionString);  connection.Open();  }  else if (connection.State == System.Data.ConnectionState.Closed)  {  connection.Open();  }  else if (connection.State == System.Data.ConnectionState.Broken)  {  connection.Close();  connection.Open();  }  return connection;  }  }  /// <summary>  /// 执行无参数的SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <returns>返回受SQL语句影响的行数</returns>  public static int ExecuteCommand(string sql)  {  OleDbCommand cmd = new OleDbCommand(sql, Connection);  int result = cmd.ExecuteNonQuery();  connection.Close();  return result;  }  /// <summary>  /// 执行有参数的SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <param name="values">参数集合</param>  /// <returns>返回受SQL语句影响的行数</returns>  public static int ExecuteCommand(string sql, params OleDbParameter[] values)  {  OleDbCommand cmd = new OleDbCommand(sql, Connection);  cmd.Parameters.AddRange(values);  int result = cmd.ExecuteNonQuery();  connection.Close();  return result;  }  /// <summary>  /// 返回单个值无参数的SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <returns>返回受SQL语句查询的行数</returns>  public static int GetScalar(string sql)  {  OleDbCommand cmd = new OleDbCommand(sql, Connection);  int result = Convert.ToInt32(cmd.ExecuteScalar());  connection.Close();  return result;  }  /// <summary>  /// 返回单个值有参数的SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <param name="parameters">参数集合</param>  /// <returns>返回受SQL语句查询的行数</returns>  public static int GetScalar(string sql, params OleDbParameter[] parameters)  {  OleDbCommand cmd = new OleDbCommand(sql, Connection);  cmd.Parameters.AddRange(parameters);  int result = Convert.ToInt32(cmd.ExecuteScalar());  connection.Close();  return result;  }  /// <summary>  /// 执行查询无参数SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <returns>返回数据集</returns>  public static DataSet GetReader(string sql)  {  OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection);  DataSet ds = new DataSet();  da.Fill(ds, "UserInfo");  connection.Close();  return ds;  }  /// <summary>  /// 执行查询有参数SQL语句  /// </summary>  /// <param name="sql">SQL语句</param>  /// <param name="parameters">参数集合</param>  /// <returns>返回数据集</returns>  public static DataSet GetReader(string sql, params OleDbParameter[] parameters)  {  OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection);  da.SelectCommand.Parameters.AddRange(parameters);  DataSet ds = new DataSet();  da.Fill(ds);  connection.Close();  return ds;  }  }
}

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2、创建实体类

2.1 创建UserInfo.cs类，用户信息实体类。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;  namespace MyStudy.Model
{  /// <summary>  /// 用户信息实体类  /// </summary>  public class UserInfo  {  public int UserId { get; set; }  public string UserName { get; set; }  public int? Age { get; set; }  public string Address { get; set; }  public DateTime? CreateTime { get; set; }  /// <summary>    /// 将DataTable转换成List数据    /// </summary>    public static List<UserInfo> ToList(DataSet dataSet)  {  List<UserInfo> userList = new List<UserInfo>();  if (dataSet != null && dataSet.Tables.Count > 0)  {  foreach (DataRow row in dataSet.Tables[0].Rows)  {  UserInfo user = new UserInfo();  if (dataSet.Tables[0].Columns.Contains("UserId") && !Convert.IsDBNull(row["UserId"]))  user.UserId = Convert.ToInt32(row["UserId"]);  if (dataSet.Tables[0].Columns.Contains("UserName") && !Convert.IsDBNull(row["UserName"]))  user.UserName = (string)row["UserName"];  if (dataSet.Tables[0].Columns.Contains("Age") && !Convert.IsDBNull(row["Age"]))  user.Age = Convert.ToInt32(row["Age"]);  if (dataSet.Tables[0].Columns.Contains("Address") && !Convert.IsDBNull(row["Address"]))  user.Address = (string)row["Address"];  if (dataSet.Tables[0].Columns.Contains("CreateTime") && !Convert.IsDBNull(row["CreateTime"]))  user.CreateTime = Convert.ToDateTime(row["CreateTime"]);  userList.Add(user);  }  }  return userList;  }    }
}

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2.2 创建Order.cs类，订单实体类。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;  namespace MyStudy.Model
{  /// <summary>  /// 订单实体类  /// </summary>  public class Order  {  public string OrderNo { get; set; }  public string ProductName { get; set; }  public int? Quantity { get; set; }  public decimal? Money { get; set; }  public DateTime? SaleDate { get; set; }  /// <summary>  /// 将DataTable转换成List数据  /// </summary>  public static List<Order> ToList(DataSet dataSet)  {  List<Order> orderList = new List<Order>();  if (dataSet != null && dataSet.Tables.Count > 0)  {  foreach (DataRow row in dataSet.Tables[0].Rows)  {  Order order = new Order();  if (dataSet.Tables[0].Columns.Contains("OrderNo") && !Convert.IsDBNull(row["OrderNo"]))  order.OrderNo = (string)row["OrderNo"];  if (dataSet.Tables[0].Columns.Contains("ProductName") && !Convert.IsDBNull(row["ProductName"]))  order.ProductName = (string)row["ProductName"];  if (dataSet.Tables[0].Columns.Contains("Quantity") && !Convert.IsDBNull(row["Quantity"]))  order.Quantity = Convert.ToInt32(row["Quantity"]);  if (dataSet.Tables[0].Columns.Contains("Money") && !Convert.IsDBNull(row["Money"]))  order.Money = Convert.ToDecimal(row["Money"]);  if (dataSet.Tables[0].Columns.Contains("SaleDate") && !Convert.IsDBNull(row["SaleDate"]))  order.SaleDate = Convert.ToDateTime(row["SaleDate"]);  orderList.Add(order);  }  }  return orderList;  }  }
}

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3、创建业务逻辑类

3.1 创建UserInfoBLL.cs类，用户信息业务类。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using MyStudy.Model;
using MyStudy.DAL;
using System.Data.OleDb;  namespace MyStudy.BLL
{  /// <summary>  /// 用户信息业务类  /// </summary>  public class UserInfoBLL  {  /// <summary>    /// 查询用户列表    /// </summary>    public List<UserInfo> GetUserList()  {  List<UserInfo> userList = new List<UserInfo>();  string sql = "SELECT * FROM [UserInfo$]";  DataSet dateSet = ExcelHelper.GetReader(sql);  userList = UserInfo.ToList(dateSet);  return userList;  }  /// <summary>    /// 获取用户总数    /// </summary>    public int GetUserCount()  {  int result = 0;  string sql = "SELECT COUNT(*) FROM [UserInfo$]";  result = ExcelHelper.GetScalar(sql);  return result;  }  /// <summary>    /// 新增用户信息    /// </summary>    public int AddUserInfo(UserInfo param)  {  int result = 0;  string sql = "INSERT INTO [UserInfo$](UserId,UserName,Age,Address,CreateTime) VALUES(@UserId,@UserName,@Age,@Address,@CreateTime)";  OleDbParameter[] oleDbParam = new OleDbParameter[]    {    new OleDbParameter("@UserId", param.UserId),     new OleDbParameter("@UserName", param.UserName),     new OleDbParameter("@Age", param.Age),    new OleDbParameter("@Address",param.Address),  new OleDbParameter("@CreateTime",param.CreateTime)    };  result = ExcelHelper.ExecuteCommand(sql, oleDbParam);  return result;  }  /// <summary>    /// 修改用户信息    /// </summary>    public int UpdateUserInfo(UserInfo param)  {  int result = 0;  if (param.UserId > 0)  {  string sql = "UPDATE [UserInfo$] SET UserName=@UserName,Age=@Age,Address=@Address WHERE UserId=@UserId";  OleDbParameter[] sqlParam = new OleDbParameter[]    {    new OleDbParameter("@UserId",param.UserId),    new OleDbParameter("@UserName", param.UserName),     new OleDbParameter("@Age", param.Age),    new OleDbParameter("@Address",param.Address)    };  result = ExcelHelper.ExecuteCommand(sql, sqlParam);  }  return result;  }  /// <summary>    /// 删除用户信息    /// </summary>    public int DeleteUserInfo(UserInfo param)  {  int result = 0;  if (param.UserId > 0)  {  string sql = "DELETE [UserInfo$] WHERE UserId=@UserId";  OleDbParameter[] sqlParam = new OleDbParameter[]    {    new OleDbParameter("@UserId",param.UserId),    };  result = ExcelHelper.ExecuteCommand(sql, sqlParam);  }  return result;  }    }
}

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3.2 创建OrderBLL.cs类，订单业务类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using MyStudy.Model;
using MyStudy.DAL;
using System.Data.OleDb;  namespace MyStudy.BLL
{  /// <summary>  /// 订单业务类  /// </summary>  public class OrderBLL  {  /// <summary>    /// 查询订单列表    /// </summary>    public List<Order> GetOrderList()  {  List<Order> orderList = new List<Order>();  string sql = "SELECT * FROM [Order$]";  DataSet dateSet = ExcelHelper.GetReader(sql);  orderList = Order.ToList(dateSet);  return orderList;  }  /// <summary>    /// 获取订单总数    /// </summary>    public int GetOrderCount()  {  int result = 0;  string sql = "SELECT COUNT(*) FROM [Order$]";  result = ExcelHelper.GetScalar(sql);  return result;  }  /// <summary>    /// 新增订单    /// </summary>    public int AddOrder(Order param)  {  int result = 0;  string sql = "INSERT INTO [Order$](OrderNo,ProductName,Quantity,Money,SaleDate) VALUES(@OrderNo,@ProductName,@Quantity,@Money,@SaleDate)";  OleDbParameter[] oleDbParam = new OleDbParameter[]    {    new OleDbParameter("@OrderNo", param.OrderNo),     new OleDbParameter("@ProductName", param.ProductName),     new OleDbParameter("@Quantity", param.Quantity),    new OleDbParameter("@Money",param.Money),  new OleDbParameter("@SaleDate",param.SaleDate)    };  result = ExcelHelper.ExecuteCommand(sql, oleDbParam);  return result;  }  /// <summary>    /// 修改订单    /// </summary>    public int UpdateOrder(Order param)  {  int result = 0;  if (!String.IsNullOrEmpty(param.OrderNo))  {  string sql = "UPDATE [Order$] SET ProductName=@ProductName,Quantity=@Quantity,Money=@Money WHERE OrderNo=@OrderNo";  OleDbParameter[] sqlParam = new OleDbParameter[]    {    new OleDbParameter("@OrderNo",param.OrderNo),    new OleDbParameter("@ProductName",param.ProductName),    new OleDbParameter("@Quantity", param.Quantity),     new OleDbParameter("@Money", param.Money)     };  result = ExcelHelper.ExecuteCommand(sql, sqlParam);  }  return result;  }  /// <summary>    /// 删除订单    /// </summary>    public int DeleteOrder(Order param)  {  int result = 0;  if (!String.IsNullOrEmpty(param.OrderNo))  {  string sql = "DELETE [Order$] WHERE OrderNo=@OrderNo";  OleDbParameter[] sqlParam = new OleDbParameter[]    {    new OleDbParameter("@OrderNo",param.OrderNo),    };  result = ExcelHelper.ExecuteCommand(sql, sqlParam);  }  return result;  }    }
}

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转载于:https://www.cnblogs.com/MirageFox/p/4919672.html

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