SQLHelper.cs
上传用户:tiancihang
上传日期:2014-03-12
资源大小:21387k
文件大小:13k
- using System;
- using System.Configuration;
- using System.Data;
- using System.Data.SqlClient;
- using System.Collections;
- namespace com.etong.DBUtility
- {
- public abstract class SqlHelper
- {
- //Database connection strings
- public static readonly string connectionString=ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;
- //public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString2"].ConnectionString;
- //public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString3"].ConnectionString;
- //public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["SQLProfileConnString"].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;
- }
- }
- public static DataSet ExecuteDataSet(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);
- cmd.Connection = conn;
- SqlDataAdapter da = new SqlDataAdapter(cmd);
- try
- {
- DataSet ds = new DataSet();
- da.Fill(ds);
- return ds;
- }
- catch
- {
- throw;
- }
- finally
- {
- cmd.Parameters.Clear();
- }
- }
- }
- public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
- {
- DataSet ds = ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
- return (ds.Tables.Count > 0) ? ds.Tables[0] : null;
- }
- /// <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);
- }
- }
- }
- }