在线等——求一个簡単さ经典的SQL(数据库)操作类 现在用的这个SQL操作类感觉不是很方便,老是要扩展方法,增、删、改、查。求一个简单实用的数据库操作类。有的前辈麻烦发邮件给我 [email protected] 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 微软的SQLHELPER详解DEMO简化版 lz,我有个问题请教你,关于excle导出的。 using System;using System.Collections.Generic;using System.Text;using System.Data.SqlClient;using System.Data;using System.Configuration;using BookShop.Models;namespace BookShop.DAL{ public class DBHelp { public static SqlConnection connection; public static SqlConnection Connection { get { string connectionString = ConfigurationManager.ConnectionStrings["mybookshop"].ConnectionString; if (connection == null) { connection = new SqlConnection(connectionString); connection.Open(); } else if (connection.State == System.Data.ConnectionState.Closed) { connection = new SqlConnection(connectionString); connection.Open(); } else if (connection.State == System.Data.ConnectionState.Broken) { connection.Close(); connection.Open(); } return connection; } } #region 增,删,改ExecuteNonQuery /// <summary> /// 单个数据增,删,改 /// </summary> /// <param name="safeSql"></param> /// <returns></returns> public static int ExecuteCommand(string safeSql) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { int result = cmd.ExecuteNonQuery(); return result; } } catch (SqlException ex) { throw ex; } } #endregion #region 带参数的增,删,改ExecuteNonQuery /// <summary> /// 带多个参数的增,删,改 /// </summary> /// <param name="safeSql"></param> /// <param name="values"></param> /// <returns></returns> public static int ExecuteCommand(string safeSql, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { cmd.Parameters.AddRange(values); return cmd.ExecuteNonQuery(); } } catch (SqlException ex) { throw ex; } } #endregion #region 带参数的增,删,改ExecuteNonQuery /// <summary> /// 带多个参数的增,删,改 /// </summary> /// <param name="safeSql"></param> /// <param name="values"></param> /// <returns></returns> public static int ExecuteCommand(string safeSql, CommandType type, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { cmd.CommandType = type; cmd.Parameters.AddRange(values); cmd.ExecuteNonQuery(); return cmd.ExecuteNonQuery(); } } catch (SqlException ex) { throw ex; } } #endregion #region 带参数的增,删,改ExecuteNonQuery (Special) /// <summary> /// 带多个参数的增,删,改 /// </summary> /// <param name="safeSql"></param> /// <param name="values"></param> /// <returns></returns> public static int ExecuteCommand(string safeSql,CommandType type, int index) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { cmd.CommandType = type; SqlParameter paramOne = new SqlParameter("@rid", SqlDbType.Int); paramOne.Value = index; cmd.Parameters.Add(paramOne); return cmd.ExecuteNonQuery(); } } catch (SqlException ex) { throw ex; } } #endregion #region 查询语句ExecuteScalar /// <summary> /// 查单个值 /// </summary> /// <param name="safeSql"></param> /// <returns></returns> public static int GetScalar(string safeSql) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { int result = Convert.ToInt32(cmd.ExecuteScalar()); return result; } } catch (SqlException ex) { throw ex; } } #endregion 接上面的、 #region 带参数的查询语句ExecuteScalar /// <summary> /// 带参数的查询语句 /// </summary> /// <param name="sql"></param> /// <param name="values"></param> /// <returns></returns> public static int GetScalar(string sql, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(sql, Connection)) { cmd.Parameters.AddRange(values); int result = Convert.ToInt32(cmd.ExecuteScalar()); return result; } } catch (SqlException ex) { throw ex; } } #endregion #region 带执行类型的ExecuteScalar /// <summary> /// 带执行类型的ExecuteScalar /// </summary> /// <param name="sql"></param> /// <param name="type"></param> /// <param name="values"></param> /// <returns></returns> public static int GetScalar(string sql, CommandType type, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(sql, Connection)) { cmd.CommandType = type; cmd.Parameters.AddRange(values); int result = Convert.ToInt32(cmd.ExecuteScalar()); return result; } } catch (SqlException ex) { throw ex; } } #endregion #region 返回DataReader /// <summary> /// 查询表,获取多个记录 /// </summary> /// <param name="safeSql"></param> /// <returns></returns> public static SqlDataReader GetReader(string safeSql) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { SqlDataReader reader = cmd.ExecuteReader(); return reader; } } catch (SqlException ex) { throw ex; } } #endregion #region 带参数DataReader /// <summary> /// 带参数的-查询表,获取多个记录 /// </summary> /// <param name="sql"></param> /// <param name="values"></param> /// <returns></returns> public static SqlDataReader GetReader(string sql, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(sql, Connection)) { cmd.Parameters.AddRange(values); SqlDataReader reader = cmd.ExecuteReader(); return reader; } } catch (SqlException) { throw; } } #endregion #region 返回DataReader ,语句,类型,参数 /// <summary> /// 查询表,获取多个记录---语句,类型,参数 /// </summary> /// <param name="safeSql"></param> /// <param name="cmdType"></param> /// <param name="values"></param> /// <returns></returns> public static SqlDataReader GetReader(string safeSql, CommandType cmdType, params SqlParameter[] values) { try { using (SqlCommand cmd = new SqlCommand(safeSql, Connection)) { cmd.CommandType = cmdType; cmd.Parameters.AddRange(values); SqlDataReader reader = cmd.ExecuteReader(); return reader; } } catch (SqlException ex) { throw ex; } } #endregion #region 返回dataTable /// <summary> /// 返回datatable /// </summary> /// <param name="safeSql"></param> /// <returns></returns> public static DataTable GetDataSet(string safeSql) { DataSet ds = new DataSet(); SqlCommand cmd = new SqlCommand(safeSql, Connection); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); return ds.Tables[0]; } #endregion #region 返回dataTable ,带参数 /// <summary> /// 返回dataTable ,带参数使用 /// </summary> /// <param name="sql"></param> /// <param name="values"></param> /// <returns></returns> public static DataTable GetDataSet(string sql, params SqlParameter[] values) { DataSet ds = new DataSet(); SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Parameters.AddRange(values); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); return ds.Tables[0]; } #endregion } } 求SQL语句!! 怎样在标题前面加上小图标 运行任何项目都会出错!! 急求树型控件的样式 SQL SERVER 连接失败 100分 那位大哥大组能给我一个Remoting 的例子 b/s模式的 送分讨论 请介绍一本学习Asp.net的好书。来者有分! 怎样把一个内存图片写入image 服务器和本机客户端程序的通信 正则表达式 服务器缓存问题!
详解DEMO简化版
using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using BookShop.Models;
namespace BookShop.DAL
{
public class DBHelp
{
public static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = ConfigurationManager.ConnectionStrings["mybookshop"].ConnectionString;
if (connection == null)
{
connection = new SqlConnection(connectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection = new SqlConnection(connectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
#region 增,删,改ExecuteNonQuery
/// <summary>
/// 单个数据增,删,改
/// </summary>
/// <param name="safeSql"></param>
/// <returns></returns>
public static int ExecuteCommand(string safeSql)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
int result = cmd.ExecuteNonQuery();
return result;
} }
catch (SqlException ex)
{ throw ex;
}
}
#endregion #region 带参数的增,删,改ExecuteNonQuery
/// <summary>
/// 带多个参数的增,删,改
/// </summary>
/// <param name="safeSql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int ExecuteCommand(string safeSql, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
}
catch (SqlException ex)
{
throw ex;
}
}
#endregion #region 带参数的增,删,改ExecuteNonQuery
/// <summary>
/// 带多个参数的增,删,改
/// </summary>
/// <param name="safeSql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int ExecuteCommand(string safeSql, CommandType type, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
cmd.CommandType = type;
cmd.Parameters.AddRange(values);
cmd.ExecuteNonQuery();
return cmd.ExecuteNonQuery();
}
}
catch (SqlException ex)
{
throw ex;
}
}
#endregion #region 带参数的增,删,改ExecuteNonQuery (Special)
/// <summary>
/// 带多个参数的增,删,改
/// </summary>
/// <param name="safeSql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int ExecuteCommand(string safeSql,CommandType type, int index)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
cmd.CommandType = type;
SqlParameter paramOne = new SqlParameter("@rid", SqlDbType.Int);
paramOne.Value = index;
cmd.Parameters.Add(paramOne);
return cmd.ExecuteNonQuery();
}
}
catch (SqlException ex)
{
throw ex;
}
}
#endregion #region 查询语句ExecuteScalar
/// <summary>
/// 查单个值
/// </summary>
/// <param name="safeSql"></param>
/// <returns></returns>
public static int GetScalar(string safeSql)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
} }
catch (SqlException ex)
{
throw ex;
}
}
#endregion
、
#region 带参数的查询语句ExecuteScalar
/// <summary>
/// 带参数的查询语句
/// </summary>
/// <param name="sql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int GetScalar(string sql, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(sql, Connection))
{
cmd.Parameters.AddRange(values);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
}
catch (SqlException ex)
{ throw ex;
}
}
#endregion #region 带执行类型的ExecuteScalar
/// <summary>
/// 带执行类型的ExecuteScalar
/// </summary>
/// <param name="sql"></param>
/// <param name="type"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int GetScalar(string sql, CommandType type, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(sql, Connection))
{
cmd.CommandType = type;
cmd.Parameters.AddRange(values);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
}
catch (SqlException ex)
{
throw ex;
}
}
#endregion #region 返回DataReader
/// <summary>
/// 查询表,获取多个记录
/// </summary>
/// <param name="safeSql"></param>
/// <returns></returns>
public static SqlDataReader GetReader(string safeSql)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
}
catch (SqlException ex)
{ throw ex;
}
}
#endregion #region 带参数DataReader
/// <summary>
/// 带参数的-查询表,获取多个记录
/// </summary>
/// <param name="sql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static SqlDataReader GetReader(string sql, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(sql, Connection))
{
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
}
catch (SqlException)
{ throw;
}
}
#endregion #region 返回DataReader ,语句,类型,参数
/// <summary>
/// 查询表,获取多个记录---语句,类型,参数
/// </summary>
/// <param name="safeSql"></param>
/// <param name="cmdType"></param>
/// <param name="values"></param>
/// <returns></returns>
public static SqlDataReader GetReader(string safeSql, CommandType cmdType, params SqlParameter[] values)
{
try
{
using (SqlCommand cmd = new SqlCommand(safeSql, Connection))
{
cmd.CommandType = cmdType;
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
}
catch (SqlException ex)
{
throw ex;
}
}
#endregion #region 返回dataTable
/// <summary>
/// 返回datatable
/// </summary>
/// <param name="safeSql"></param>
/// <returns></returns>
public static DataTable GetDataSet(string safeSql)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
#endregion #region 返回dataTable ,带参数
/// <summary>
/// 返回dataTable ,带参数使用
/// </summary>
/// <param name="sql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static DataTable GetDataSet(string sql, params SqlParameter[] values)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
#endregion } }