通用的数据访问组建 SqlHelper

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

public class SqlHelper

{

public static readonly string sqlstr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;

/// <summary>

/// 添加 修改 删除

/// </summary>

/// <returns>0 代表失败</returns>

public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

{

SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(connectionString))

{

PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

int val = cmd.ExecuteNonQuery();

cmd.Parameters.Clear();

return val;

}

}

/// <summary>

/// 事物

/// </summary>

/// <returns>0 代表失败</returns>

public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);

int val = cmd.ExecuteNonQuery();

cmd.Parameters.Clear();

return val;

}

/// <summary>

/// DataSource = DataReader + 泛型

/// </summary>

/// <returns>DataReader</returns>

public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

{

SqlCommand cmd = new SqlCommand();

SqlConnection conn = new SqlConnection(connectionString);

try

{

PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

cmd.Parameters.Clear();

return rdr;

}

catch

{

conn.Close();

throw;

}

}

/// <summary>

/// DataSource = DataSet

/// </summary>

/// <returns>DataSet</returns>

public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

{

SqlCommand cmd = new SqlCommand();

SqlConnection conn = new SqlConnection(connectionString);

try

{

PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

SqlDataAdapter da = new SqlDataAdapter();

da.SelectCommand = cmd;

DataSet ds = new DataSet();

da.Fill(ds);

return ds;

}

catch

{

throw;

}

}

/// <summary>

/// 第一行 第一列

/// </summary>

/// <returns>对象</returns>

public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

{

SqlCommand cmd = new SqlCommand();

using (SqlConnection connection = new SqlConnection(connectionString))

{

PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

object val = cmd.ExecuteScalar();

cmd.Parameters.Clear();

return val;

}

}

/// <summary>

/// 内部配置

/// </summary>

private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)

{

if (conn.State != ConnectionState.Open)

conn.Open();

cmd.Connection = conn;

cmd.CommandText = cmdText;

if (trans != null)

cmd.Transaction = trans;

cmd.CommandType = cmdType;

if (cmdParms != null)

{

foreach (SqlParameter parm in cmdParms)

cmd.Parameters.Add(parm);

}

}

}