using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration; namespace DAL
{
public class SQLHelper
{ private SqlConnection conn =null;
private SqlCommand cmd = null;
private SqlDataReader sdr = null; public SQLHelper()
{
string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
conn = new SqlConnection(connStr);
} private SqlConnection GetConn()
{
if (conn.State==ConnectionState.Closed)
{
conn.Open();
}
return conn;
} /// <summary>
/// 执行不带参数的增删改查SQL语句或存储过程
/// </summary>
/// <param name="cmdText">不带参数的增删改查SQL语句或存储过程</param>
/// <param name="ct">命令类型</param>
/// <returns></returns>
public int ExecuteNonQuery(string cmdText,CommandType ct)
{
int res;
using (cmd = new SqlCommand(cmdText, GetConn()))
{
cmd.CommandType = ct;
res = cmd.ExecuteNonQuery();
}
return res;
} /// <summary>
/// 执行带参数的SQL增删改查或存储过程
/// </summary>
/// <param name="cmdText">参数的SQL增删改查或存储过程</param>
/// <param name="paras">参数集合</param>
/// <param name="ct">命令类型</param>
/// <returns></returns>
public int ExecuteNonQuery(string cmdText,SqlParameter[] paras,CommandType ct)
{
int res;
using (cmd = new SqlCommand(cmdText, GetConn()))
{ cmd.Parameters.AddRange(paras);
cmd.CommandType = ct;
res = cmd.ExecuteNonQuery();
}
return res;
} /// <summary>
/// 执行带参数的增删改SQL语句或存储过程
/// </summary>
/// <param name="sql">带参数的增删改SQL语句或存储过程</param>
/// <param name="ct">命令类型</param>
/// <returns></returns>
public DataTable ExecuteQuery(string cmdText,CommandType ct)
{
DataTable dt = new DataTable();
cmd = new SqlCommand(cmdText, GetConn());
cmd.CommandType = ct;
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
return dt;
} /// <summary>
/// 执行带参数的SQL查询语句
/// </summary>
/// <param name="cmdText">带参数的SQL查询语句</param>
/// <param name="paras">参数集合</param>
/// <param name="ct">执行类型</param>
/// <returns>DataTable</returns>
public DataTable ExecuteQuery(string cmdText, SqlParameter[] paras,CommandType ct)
{
DataTable dt = new DataTable();
cmd = new SqlCommand(cmdText, GetConn());
cmd.Parameters.AddRange(paras);
cmd.CommandType = ct;
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
return dt;
} /// <summary>
/// ExecuteScalar--返回首行首列
/// </summary>
/// <param name="XSqlString">sql语句</param>
/// <returns>返回结果集的首行首列</returns>
public int GetRecordCount(string XSqlString)
{
string SCount; SqlCommand Cmd = new SqlCommand(XSqlString, GetConn());
SCount = Cmd.ExecuteScalar().ToString().Trim(); //返回结果集的首行首列,忽略其它
if (SCount == "")
SCount = "0"; return Convert.ToInt32(SCount);
} }
}