C#的SQL操作类实例

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.SqlClient;

using System.Windows.Forms;

namespace yjgl

{

/// <summary>

/// 数据访问基础类(SQL)

/// </summary>

class BaseOperate

{

#region  建立数据库连接

/// <summary>

/// 建立数据库连接.

/// </summary>

/// <returns>返回SqlConnection对象</returns>

public SqlConnection getcon()

{

string M_str_sqlcon = “Data Source=PC-200201010009 ;Database=db_yjzl;User ID=sa;PWD=123”;//连接字符串

SqlConnection mycon = new SqlConnection(M_str_sqlcon);      //创建连接对象

return mycon;

}

#endregion

#region  执行SqlCommand命令

/// <summary>

/// 执行SqlCommand

/// </summary>

/// <param name=”M_str_sqlstr”>SQL语句</param>

public void getcom(string M_str_sqlstr)

{

SqlConnection sqlcon = this.getcon();   //获取连接字符串

sqlcon.Open();       //打开连接

try

{

SqlCommand sqlcom = new SqlCommand(M_str_sqlstr, sqlcon);  //通过SQL语句和连接对象创建命令对象

sqlcom.ExecuteNonQuery();     //对sqlcon执行SQL语句并返回受影响的行数

sqlcom.Dispose();           //释放sqlcom’

}

catch (SqlException e)

{

MessageBox.Show(e.ToString(), “信息提示”, MessageBoxButtons.OK, MessageBoxIcon.Information);

}

finally

{

sqlcon.Close();

sqlcon.Dispose();

}

}

#endregion

#region  创建DataSet对象

/// <summary>

/// 创建一个DataSet对象

/// </summary>

/// <param name=”M_str_sqlstr”>SQL语句</param>

/// <param name=”M_str_table”>表名</param>

/// <returns>返回DataSet对象</returns>

public DataSet getds(string M_str_sqlstr, string M_str_table)  //查询

{

SqlConnection sqlcon = this.getcon();

SqlDataAdapter sqlda = new SqlDataAdapter(M_str_sqlstr, sqlcon);

DataSet myds = new DataSet();

sqlda.Fill(myds, M_str_table);

return myds;

}

#endregion

#region  创建SqlDataReader对象

/// <summary>

/// 创建一个SqlDataReader对象

/// </summary>

/// <param name=”M_str_sqlstr”>SQL语句</param>

/// <returns>返回SqlDataReader对象</returns>

public SqlDataReader getread(string M_str_sqlstr)

{

SqlConnection sqlcon = this.getcon();

SqlCommand sqlcom = new SqlCommand(M_str_sqlstr, sqlcon);

sqlcon.Open();

SqlDataReader sqlread = sqlcom.ExecuteReader(CommandBehavior.CloseConnection);

return sqlread;

}

#endregion

}

}