微软SqlServerHelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;// 先引用 System.Configuration

namespace Common
{
/// <summary>
/// 数据库访问辅助类，add by ngye, on 2013-08-14.
/// </summary>
public static class DBHelper
{
#region [ Tools ]
//public static string ConnectionString =  ConfigurationManager.ConnectionStrings["sqlserver"].ConnectionString;
public static string ConnectionString = "Data Source=leaf-home\\sqlserver2005;Initial Catalog=Test;Persist Security Info=True;User ID=??;Password=??";

public static SqlConnection GetConnection()
{
return new SqlConnection(ConnectionString);
}

public static SqlCommand AddTimeout(this SqlCommand cmd)
{
cmd.CommandTimeout = 3600;
return cmd;
}

/// <summary>
/// 执行cmd得到 DataTable. by ngye, on 2013-08-01
/// </summary>
/// <param name="cmd"></param>
/// <returns></returns>
public static DataTable ExecuteDataTable(this SqlCommand cmd)
{
DataTable dt = new DataTable();
using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))
{
adapter.Fill(dt);
}
return dt;
}

/// <summary>
/// 为SqlParameter设置参数. by ngye, on 2013-08-15.
/// </summary>
/// <param name="sp"></param>
/// <returns></returns>
public static SqlParameter SetValue(this SqlParameter sp, object value)
{
sp.Value = value;
return sp;
}

/// <summary>
/// 为SqlParameter设置类型. by ngye, on 2013-08-15.
/// </summary>
/// <param name="sp"></param>
/// <returns></returns>
public static SqlParameter SetDbType(this SqlParameter sp, DbType dbType)
{
sp.DbType = dbType;
return sp;
}
#endregion

#region [ ExecuteNonQuery_ForProc (无参/有参) ]
///// <summary>
/// 根据存储过程，返回受影响行数
/// </summary>
/// <param name="proc">proc</param>
/// <returns>受影响行数</returns>
public static int ExecuteNonQuery_ForProc(string proc)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(proc, conn).AddTimeout();
cmd.CommandType = CommandType.StoredProcedure;
return cmd.ExecuteNonQuery();
}
}

///// <summary>
/// 根据存储过程和参数，返回受影响行数
/// </summary>
/// <param name="proc">proc</param>
/// <param name="spArr">可变参数</param>
/// <returns>受影响行数</returns>
public static int ExecuteNonQuery_ForProc(string proc, params SqlParameter[] spArr)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(proc, conn).AddTimeout();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(spArr);
return cmd.ExecuteNonQuery();
}
}
#endregion

#region [ ExecuteNonQuery (无参/有参) ]
///// <summary>
/// 根据sql语句，返回受影响行数
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns>受影响行数</returns>
public static int ExecuteNonQuery(string sql)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
return cmd.ExecuteNonQuery();
}
}

///// <summary>
/// 根据sql语句和参数，返回受影响行数
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="spArr">可变参数</param>
/// <returns>受影响行数</returns>
public static int ExecuteNonQuery(string sql, params SqlParameter[] spArr)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
cmd.Parameters.AddRange(spArr);
return cmd.ExecuteNonQuery();
}
}
#endregion

#region [ ExecuteScalar (无参/有参) ]
/// <summary>
/// 根据sql语句，返回Scalar结果
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns>object</returns>
public static object ExecuteScalar(string sql)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
object obj = cmd.ExecuteScalar();
return obj;
}
}

/// <summary>
/// 根据sql语句和参数，返回Scalar结果
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="spArr">可变参数</param>
/// <returns>object</returns>
public static object ExecuteScalar(string sql, params SqlParameter[] spArr)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
cmd.Parameters.AddRange(spArr);
object obj = cmd.ExecuteScalar();
return obj;
}
}
#endregion

#region [ QueryByProc (无参/有参) ]
/// <summary>
/// 根据存储过程，返回DataTable
/// </summary>
/// <param name="proc">proc</param>
/// <returns>DataTable</returns>
public static DataTable GetDataTableByProc(string proc)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(proc, conn).AddTimeout();
cmd.CommandType = CommandType.StoredProcedure;
DataTable dt = cmd.ExecuteDataTable();
return dt;
}
}

/// <summary>
/// 根据存储过程及参数，返回DataTable
/// </summary>
/// <returns>DataTable</returns>
public static DataTable GetDataTableByProc(string proc, params SqlParameter[] spArr)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(proc, conn).AddTimeout();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(spArr);
DataTable dt = cmd.ExecuteDataTable();
return dt;
}
}
#endregion

#region [ Query (无参) ]
/// <summary>
/// 根据sql语句和参数，返回DataTable
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns>DataTable</returns>
public static DataTable GetDataTableBySql(string sql)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
DataTable dt = cmd.ExecuteDataTable();
return dt;
}
}

/// <summary>
/// 根据sql语句，返回DataRow
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns>DataRow</returns>
public static DataRow GetDataRowBySql(string sql)
{
DataTable dt = GetDataTableBySql(sql);
if (dt == null || dt.Rows.Count == 0)
return null;

return dt.Rows[0];
}
#endregion

#region [ Query (有参) ]
/// <summary>
/// 根据sql语句和参数，返回DataTable
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="spArr">可变参数</param>
/// <returns>DataTable</returns>
public static DataTable GetDataTableBySql(string sql, params SqlParameter[] spArr)
{
using (SqlConnection conn = GetConnection())
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn).AddTimeout();
cmd.Parameters.AddRange(spArr);
DataTable dt = cmd.ExecuteDataTable();
return dt;
}
}

/// <summary>
/// 根据sql语句和参数，返回DataRow
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="spArr">可变参数</param>
/// <returns>DataRow</returns>
public static DataRow GetDataRowBySql(string sql, params SqlParameter[] spArr)
{
DataTable dt = GetDataTableBySql(sql, spArr);
if (dt == null || dt.Rows.Count==0)
return null;

return dt.Rows[0];
}
#endregion
}//end of class
}//end of namespace

//===============================================================================
// This file is based on the Microsoft Data Access Application Block for .NET
// For more information please go to
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp //===============================================================================

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace FingerLink.Core.Communal
{

/// <summary>
/// The SqlHelper class is intended to encapsulate high performance,
/// scalable best practices for common uses of SqlClient.
/// </summary>
public class SqlServerHelper
{

//Database connection strings
public static string connString = ConfigurationManager.ConnectionStrings["sqlserver"].ConnectionString;

// Hashtable to store cached parameters
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

/// <summary>
/// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>an int representing the number of rows affected by the command</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>
/// Execute a SqlCommand (that returns no resultset) against an existing database connection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="conn">an existing database connection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>an int representing the number of rows affected by the command</returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}

/// <summary>
/// Execute a SqlCommand (that returns no resultset) using an existing SQL Transaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="trans">an existing sql transaction</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>an int representing the number of rows affected by the command</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>
/// Execute a SqlCommand that returns a resultset against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>A SqlDataReader containing the results</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);

// we use a try/catch here because if the method throws an exception we want to
// close the connection throw code, because no datareader will exist, hence the
// commandBehaviour.CloseConnection will not work
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}

/// <summary>
/// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>An object that should be converted to the expected type using Convert.To{Type}</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>
/// Execute a SqlCommand that returns the first column of the first record against an existing database connection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="conn">an existing database connection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}

/// <summary>
/// add parameter array to the cache
/// </summary>
/// <param name="cacheKey">Key to the parameter cache</param>
/// <param name="cmdParms">an array of SqlParamters to be cached</param>
public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}

/// <summary>
/// Retrieve cached parameters
/// </summary>
/// <param name="cacheKey">key used to lookup parameters</param>
/// <returns>Cached SqlParamters array</returns>
public static SqlParameter[] GetCachedParameters(string cacheKey)
{
SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

if (cachedParms == null)
return null;

SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

for (int i = 0, j = cachedParms.Length; i < j; i++)
clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

return clonedParms;
}

/// <summary>
/// Prepare a command for execution
/// </summary>
/// <param name="cmd">SqlCommand object</param>
/// <param name="conn">SqlConnection object</param>
/// <param name="trans">SqlTransaction object</param>
/// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
/// <param name="cmdText">Command text, e.g. Select * from Products</param>
/// <param name="cmdParms">SqlParameters to use in the command</param>
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);
}
}
}
}