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C#操作Excel数据增删改查示例(1)

关键词:C#Excel数据增删改查  阅读(2526) 赞(20)

[摘要]Excel数据增删改查我们可以使用c#进行操作,首先创建ExcelDB.xlsx文件,并添加两张工作表,接下按照下面的操作步骤即可
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;
}
}
}

2、 创建实体类
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