SqlHelper.cs
资源名称:SHOPASP.rar [点击查看]
上传用户:xiecaij
上传日期:2015-02-08
资源大小:2016k
文件大小:15k
源码类别:
百货/超市行业
开发平台:
ASP/ASPX
- //===============================================================================
- // 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 eshop.DAL
- {
- /// <summary>
- /// The SqlHelper class is intended to encapsulate high performance,
- /// scalable best practices for common uses of SqlClient.
- /// </summary>
- public abstract class SQLHelper
- {
- //Database connection strings
- public static readonly string CONN_STRING = ConfigurationSettings.AppSettings["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 connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- using (SqlConnection conn = new SqlConnection(connString))
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- //清除cmd的参数
- 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 conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- 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[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- cmd.Parameters.Clear();
- return val;
- }
- /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
- /// the connection string.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
- /// </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>
- /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
- public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
- {
- //pass through the call providing null for the set of SqlParameters
- return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
- }
- /// <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 connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- SqlConnection conn = new SqlConnection(connString);
- try
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
- cmd.Parameters.Clear();
- return rdr;
- }
- catch
- {
- conn.Close();
- throw;
- }
- }
- /// <summary>
- /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
- /// the connection string.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
- /// </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>
- /// <returns>a dataset containing the resultset generated by the command</returns>
- public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
- {
- return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
- }
- /// <summary>
- /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
- /// using the provided parameters.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", 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 dataset containing the resultset generated by the command</returns>
- public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
- {
- using (SqlConnection cn = new SqlConnection(connectionString))
- {
- cn.Open();
- //调用重载方法
- return ExecuteDataset(cn, commandType, commandText, commandParameters);
- }
- }
- /// <summary>
- /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
- /// </remarks>
- /// <param name="connection">a valid SqlConnection</param>
- /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
- /// <param name="commandText">the stored procedure name or T-SQL command</param>
- /// <returns>a dataset containing the resultset generated by the command</returns>
- public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
- {
- return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
- }
- /// <summary>
- /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
- /// using the provided parameters.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
- /// </remarks>
- /// <param name="connection">a valid 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 dataset containing the resultset generated by the command</returns>
- public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
- {
- //创建一个SqlCommand对象,并对其进行初始化
- SqlCommand cmd = new SqlCommand();
- PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
- //创建SqlDataAdapter对象以及DataSet
- SqlDataAdapter da = new SqlDataAdapter(cmd);
- DataSet ds = new DataSet();
- //填充ds
- da.Fill(ds);
- // 清除cmd的参数集合
- cmd.Parameters.Clear();
- //返回ds
- return ds;
- }
- /// <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 connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- using (SqlConnection conn = new SqlConnection(connString))
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- 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 conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
- {
- SqlCommand cmd = new SqlCommand();
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- 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[] cmdParms)
- {
- parmCache[cacheKey] = cmdParms;
- }
- /// <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)
- {
- //判断连接的状态。如果是关闭状态,则打开
- if (conn.State != ConnectionState.Open)
- conn.Open();
- //cmd属性赋值
- cmd.Connection = conn;
- cmd.CommandText = cmdText;
- //是否需要用到事务处理
- if (trans != null)
- cmd.Transaction = trans;
- cmd.CommandType = cmdType;
- //添加cmd需要的存储过程参数
- if (cmdParms != null)
- {
- foreach (SqlParameter parm in cmdParms)
- cmd.Parameters.Add(parm);
- }
- }
- }
- }