SQLHelper.cs 文件
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SQLHelper.cs 文件
//=================================================================================================
// 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 PetShop.DBUtility ......{
/**//**//**//// 〈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 ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings[“SQLConnString1“].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;
}
}
/**//**//**//// 〈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);
}
}
}
}
//=================================================================================================
// 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 PetShop.DBUtility ......{
/**//**//**//// 〈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 ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings[“SQLConnString1“].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;
}
}
/**//**//**//// 〈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);
}
}
}
}
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