using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace MyBookShopSys.DAL
{
/// <summary>
/// </summary>
public static class DBHelper
{
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = ConfigurationManager.ConnectionStrings["MyBookShopSys"].ConnectionString;
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;
}
}
/// <summary>
/// 执行一个增删改存储过程(有参)
/// </summary>
/// <param name="procName">存储过程名字</param>
/// <param name="values">参数列表</param>
/// <returns>影响行数</returns>
public static int ExecuteProc(string procName, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Connection;
cmd.CommandText = procName;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
/// <summary>
/// 执行一个查询无参存储过程，要关闭
/// </summary>
/// <param name="procName">存储过程名字</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader ExecuteProcSelect(string procName)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Connection;
cmd.CommandText = procName;
cmd.CommandType = CommandType.StoredProcedure;
return cmd.ExecuteReader();
}
/// <summary>
/// 执行一个带参查询存储过程,注意要关闭
/// </summary>
/// <param name="procName">存储过程名字</param>
/// <param name="values">参数列表</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader ExecuteProcSelect(string procName, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Connection;
cmd.CommandText = procName;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(values);
return cmd.ExecuteReader();
}
/// <summary>
/// 执行一个无参增删改存储过程
/// </summary>
/// <param name="procName">存储过程名字</param>
/// <returns>影响行数</returns>
public static int ExecuteProc(string procName)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Connection;
cmd.CommandText = procName;
cmd.CommandType = CommandType.StoredProcedure;
return cmd.ExecuteNonQuery();
}
/// <summary>
/// 执行一个(无参)增删改语句
/// </summary>
/// <param name="safeSql">语句</param>
/// <returns>影响行数</returns>
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
/// <summary>
/// 执行一个有参增删改操作
/// </summary>
/// <param name="sql">语句</param>
/// <param name="values">参数</param>
/// <returns>影响行数 </returns>
public static int ExecuteCommand(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
/// <summary>
/// 查询第一行第一列数据（无参）（返回的是什么类型就转换成什么类型）
/// </summary>
/// <param name="safeSql">语句</param>
/// <returns>object</returns>
public static object GetScalar(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
return cmd.ExecuteScalar();
}
/// <summary>
/// 查询第一行第一列数据（有参）（返回的是什么类型就转换成什么类型）
/// </summary>
/// <param name="values">参数</param>
/// <returns>object</returns>
public static object GetScalar(string safeSql,params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(safeSql,Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteScalar();
}
/// <summary>
/// 返回一个SqlDataReader（注意要关闭）
/// </summary>
/// <param name="safeSql">语句</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader GetReader(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
/// <summary>
/// 返回int
/// </summary>
/// <param name="sql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int GetScalarInt(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return Convert.ToInt32(cmd.ExecuteScalar());
}
/// <summary>
/// 返回string
/// </summary>
/// <param name="sql"></param>
/// <param name="values"></param>
/// <returns></returns>
public static string GetScalarString(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return Convert.ToString(cmd.ExecuteScalar());
}
/// <summary>
/// 返回一个有参SqlDataReader（注意要关闭）
/// </summary>
/// <param name="sql">语句</param>
/// <param name="values">参数</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader GetReader(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
/// <summary>
/// 返回一个Datatable（无参）
/// </summary>
/// <param name="safeSql">语句</param>
/// <returns>DataTable</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];
}
/// <summary>
/// 返回一个Datatable（有参）
/// </summary>
/// <param name="sql">语句</param>
/// <param name="values">参数</param>
/// <returns>DataTable</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];
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
public static void ExecuteSqlTran(ArrayList SQLStringList)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Connection;
SqlTransaction tx = Connection.BeginTransaction();
cmd.Transaction=tx;
try
{
for(int n=0;n<SQLStringList.Count;n++)
{
string strsql=SQLStringList[n].ToString();
if (strsql.Trim().Length>1)
{
cmd.CommandText=strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch(System.Data.SqlClient.SqlException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
}
