Question

求SQLHelper类中文版（注释中文的）

Answer 1

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

}

}