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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace MyBookShop.DAL
{
public static class DBHelper
{
//SQL数据库的连接
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = "Data Source=.;Initial Catalog=MyKTV;Integrated Security=True";
if (connection == null)
{
connection = new SqlConnection(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;
}
}
//执行,并返回执行后的结果值
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
//执行不带参数数据记录的增、删、改操作,并返回执行后的结果值
public static int Command(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = (int)(cmd.ExecuteScalar());
return result;
}
//返回执行不带参数SQL语句后的阅读器
public static SqlDataReader GetReader(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
//返回执行不带参数SQL语句后的结果数据表
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];
}
}
}