C#操作Excel數據增刪改查。
首先創建ExcelDB.xlsx文件，並添加兩張工作表。
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、創建ExcelHelper.cs類，Excel文件處理類
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data;
namespace MyStudy.DAL
{
/// <summary>
/// Excel文件處理類
/// </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>
/// 執行無參數的SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <returns>返回受SQL語句影響的行數</returns>
public static int ExecuteCommand(string sql)
{
OleDbCommand cmd = new OleDbCommand(sql, Connection);
int result = cmd.ExecuteNonQuery();
connection.Close();
return result;
}
/// <summary>
/// 執行有參數的SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <param name="values">參數集合</param>
/// <returns>返回受SQL語句影響的行數</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>
/// 返回單個值無參數的SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <returns>返回受SQL語句查詢的行數</returns>
public static int GetScalar(string sql)
{
OleDbCommand cmd = new OleDbCommand(sql, Connection);
int result = Convert.ToInt32(cmd.ExecuteScalar());
connection.Close();
return result;
}
/// <summary>
/// 返回單個值有參數的SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <param name="parameters">參數集合</param>
/// <returns>返回受SQL語句查詢的行數</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>
/// 執行查詢無參數SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <returns>返回數據集</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>
/// 執行查詢有參數SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <param name="parameters">參數集合</param>
/// <returns>返回數據集</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;
}
}
}
2、 創建實體類
2.1 創建UserInfo.cs類，用戶信息實體類。
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace MyStudy.Model
{
/// <summary>
/// 用戶信息實體類
/// </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>
/// 將DataTable轉換成List數據
/// </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;
}
}
}
2.2 創建Order.cs類，訂單實體類。
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace MyStudy.Model
{
/// <summary>
/// 訂單實體類
/// </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>
/// 將DataTable轉換成List數據
/// </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;
}
}
}
3、創建業務邏輯類
3.1 創建UserInfoBLL.cs類，用戶信息業務類。
復制代碼 代碼如下:
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>
/// 用戶信息業務類
/// </summary>
public class UserInfoBLL
{
/// <summary>
/// 查詢用戶列表
/// </summary>
public List<UserInfo> GetUserList()
{
List<UserInfo> userList = new List<UserInfo>();
string sql = "SELECT * FROM [UserInfo$]";
DataSet dateSet = ExcelHelper.GetReader(sql);
userList = UserInfo.ToList(dateSet);
return userList;
}
/// <summary>
/// 獲取用戶總數
/// </summary>
public int GetUserCount()
{
int result = 0;
string sql = "SELECT COUNT(*) FROM [UserInfo$]";
result = ExcelHelper.GetScalar(sql);
return result;
}
/// <summary>
/// 新增用戶信息
/// </summary>
public int AddUserInfo(UserInfo param)
{
int result = 0;
string sql = "INSERT INTO [UserInfo$](UserId,UserName,Age,Address,CreateTime) VALUES(@UserId,@UserName,@Age,@Address,@CreateTime)";
OleDbParameter[] oleDbParam = new OleDbParameter[]
{
new OleDbParameter("@UserId", param.UserId),
new OleDbParameter("@UserName", param.UserName),
new OleDbParameter("@Age", param.Age),
new OleDbParameter("@Address",param.Address),
new OleDbParameter("@CreateTime",param.CreateTime)
};
result = ExcelHelper.ExecuteCommand(sql, oleDbParam);
return result;
}
/// <summary>
/// 修改用戶信息
/// </summary>
public int UpdateUserInfo(UserInfo param)
{
int result = 0;
if (param.UserId > 0)
{
string sql = "UPDATE [UserInfo$] 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>
/// 刪除用戶信息
/// </summary>
public int DeleteUserInfo(UserInfo param)
{
int result = 0;
if (param.UserId > 0)
{
string sql = "DELETE [UserInfo$] WHERE UserId=@UserId";
OleDbParameter[] sqlParam = new OleDbParameter[]
{
new OleDbParameter("@UserId",param.UserId),
};
result = ExcelHelper.ExecuteCommand(sql, sqlParam);
}
return result;
}
}
}
3.2 創建OrderBLL.cs類，訂單業務類
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using MyStudy.Model;
using MyStudy.DAL;
using System.Data.OleDb;
namespace MyStudy.BLL
{
/// <summary>
/// 訂單業務類
/// </summary>
public class OrderBLL
{
/// <summary>
/// 查詢訂單列表
/// </summary>
public List<Order> GetOrderList()
{
List<Order> orderList = new List<Order>();
string sql = "SELECT * FROM [Order$]";
DataSet dateSet = ExcelHelper.GetReader(sql);
orderList = Order.ToList(dateSet);
return orderList;
}
/// <summary>
/// 獲取訂單總數
/// </summary>
public int GetOrderCount()
{
int result = 0;
string sql = "SELECT COUNT(*) FROM [Order$]";
result = ExcelHelper.GetScalar(sql);
return result;
}
/// <summary>
/// 新增訂單
/// </summary>
public int AddOrder(Order param)
{
int result = 0;
string sql = "INSERT INTO [Order$](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>
/// 修改訂單
/// </summary>
public int UpdateOrder(Order param)
{
int result = 0;
if (!String.IsNullOrEmpty(param.OrderNo))
{
string sql = "UPDATE [Order$] SET ProductName=@ProductName,Quantity=@Quantity,Money=@Money WHERE OrderNo=@OrderNo";
OleDbParameter[] sqlParam = new OleDbParameter[]
{
new OleDbParameter("@OrderNo",param.OrderNo),
new OleDbParameter("@ProductName",param.ProductName),
new OleDbParameter("@Quantity", param.Quantity),
new OleDbParameter("@Money", param.Money)
};
result = ExcelHelper.ExecuteCommand(sql, sqlParam);
}
return result;
}
/// <summary>
/// 刪除訂單
/// </summary>
public int DeleteOrder(Order param)
{
int result = 0;
if (!String.IsNullOrEmpty(param.OrderNo))
{
string sql = "DELETE [Order$] WHERE OrderNo=@OrderNo";
OleDbParameter[] sqlParam = new OleDbParameter[]
{
new OleDbParameter("@OrderNo",param.OrderNo),
};
result = ExcelHelper.ExecuteCommand(sql, sqlParam);
}
return result;
}
}
}
