MySql 数据操作类

/// <summary>
/// MySqlHelper 的摘要说明。
/// </summary>
public class MySqlHelper
{
public static string connectionString = ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;
#region private utility methods & constructors

//Since this class provides only static methods, make the default constructor private to prevent
//instances from being created with "new SqlHelper()".
private SqlHelper()
{

}

/// <summary>
/// This method is used to attach array of SqlParameters to a SqlCommand.
///
/// This method will assign a value of DbNull to any parameter with a direction of
/// InputOutput and a value of null.
///
/// This behavior will prevent default values from being used, but
/// this will be the less common case than an intended pure output parameter (derived as InputOutput)
/// where the user provided no input value.
/// </summary>
/// <param name="command">The command to which the parameters will be added</param>
/// <param name="commandParameters">an array of SqlParameters tho be added to command</param>
private static void AttachParameters(MySqlCommand command, MySqlParameter[] commandParameters)
{
try
{
foreach (MySqlParameter p in commandParameters)
{
//check for derived output value with no value assigned
if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
{
p.Value = DBNull.Value;
}
else
{
if (p.Value == null)
{
p.Value = DBNull.Value;
}
}

command.Parameters.Add(p);
}
}
catch (Exception ex)
{
Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
}
}

/// <summary>
/// This method assigns an array of values to an array of SqlParameters.
/// </summary>
/// <param name="commandParameters">array of SqlParameters to be assigned values</param>
/// <param name="parameterValues">array of Components holding the values to be assigned</param>
private static void AssignParameterValues(MySqlParameter[] commandParameters, object[] parameterValues)
{
try
{
if ((commandParameters == null) || (parameterValues == null))
{
//do nothing if we get no data
return;
}

// we must have the same number of values as we pave parameters to put them in
if (commandParameters.Length != parameterValues.Length)
{
throw new ArgumentException("Parameter count does not match Parameter Value count.");
}

//iterate through the SqlParameters, assigning the values from the corresponding position in the
//value array
for (int i = 0, j = commandParameters.Length; i < j; i++)
{
commandParameters[i].Value = parameterValues[i];
}
}
catch (Exception ex)
{
Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
}

}

/// <summary>
/// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
/// to the provided command.
/// </summary>
/// <param name="command">the SqlCommand to be prepared</param>
/// <param name="connection">a valid SqlConnection, on which to execute this command</param>
/// <param name="transaction">a valid SqlTransaction, or 'null'</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 SqlParameters to be associated with the command or 'null' if no parameters are required</param>
private static void PrepareCommand(MySqlCommand command, MySqlConnection connection, MySqlTransaction transaction,
CommandType commandType, string commandText, MySqlParameter[] commandParameters)
{
try
{
//if the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
connection.Open();
}

//associate the connection with the command
command.Connection = connection;

//set the command text (stored procedure name or SQL statement)
command.CommandText = commandText;

//if we were provided a transaction, assign it.
if (transaction != null)
{
command.Transaction = transaction;
}

//set the command type
command.CommandType = commandType;

//attach the command parameters if they are provided
if (commandParameters != null)
{
AttachParameters(command, commandParameters);
}
}
catch (Exception ex)
{
Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
}

return;
}

#endregion private utility methods & constructors

#region DataHelpers

public static string CheckNull(object obj)
{
return (string)obj;
}

public static string CheckNull(DBNull obj)
{
return null;
}

#endregion

#region AddParameters

public static object CheckForNullString(string text)
{
if (text == null || text.Trim().Length == 0)
{
return System.DBNull.Value;
}
else
{
return text;
}
}

public static MySqlParameter MakeInParam(string ParamName, object Value)
{
return new MySqlParameter(ParamName, Value);
}

/// <summary>
/// Make input param.
/// </summary>
/// <param name="ParamName">Name of param.</param>
/// <param name="DbType">Param type.</param>
/// <param name="Size">Param size.</param>
/// <param name="Value">Param value.</param>
/// <returns>New parameter.</returns>
public static MySqlParameter MakeInParam(string ParamName, MySqlDbType DbType, int Size, object Value)
{
return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
}

/// <summary>
/// Make input param.
/// </summary>
/// <param name="ParamName">Name of param.</param>
/// <param name="DbType">Param type.</param>
/// <param name="Size">Param size.</param>
/// <returns>New parameter.</returns>
public static MySqlParameter MakeOutParam(string ParamName, MySqlDbType DbType, int Size)
{
return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
}

/// <summary>
/// Make stored procedure param.
/// </summary>
/// <param name="ParamName">Name of param.</param>
/// <param name="DbType">Param type.</param>
/// <param name="Size">Param size.</param>
/// <param name="Direction">Parm direction.</param>
/// <param name="Value">Param value.</param>
/// <returns>New parameter.</returns>
public static MySqlParameter MakeParam(string ParamName, MySqlDbType DbType, Int32 Size,
ParameterDirection Direction, object Value)
{
MySqlParameter param;

if (Size > 0)
param = new MySqlParameter(ParamName, DbType, Size);
else
param = new MySqlParameter(ParamName, DbType);

param.Direction = Direction;
if (!(Direction == ParameterDirection.Output && Value == null))
param.Value = Value;

return param;
}

#endregion

#region ExecuteNonQuery

/// <summary>
/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in
/// the connection string.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
/// </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>an int representing the number of rows affected by the command</returns>
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteNonQuery(connectionString, commandType, commandText, (MySqlParameter[])null);
}

public static int ExecuteNonQuery(CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteNonQuery(connectionString, commandType, commandText, commandParameters);
}

/// <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 commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();
//call the overload that takes a connection in place of the connection string
return ExecuteNonQuery(cn, commandType, commandText, commandParameters);
}
}

/// <summary>
/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
/// </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>an int representing the number of rows affected by the command</returns>
public static int ExecuteNonQuery(MySqlConnection connection, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteNonQuery(connection, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", 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>an int representing the number of rows affected by the command</returns>
public static int ExecuteNonQuery(MySqlConnection connection, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
MySqlTransaction sqltran;
sqltran = connection.BeginTransaction();
int retval = -1;
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();

PrepareCommand(cmd, connection, sqltran, commandType, commandText, commandParameters);
//cmd.CommandTimeout = 5;
//finally, execute the command.
retval = cmd.ExecuteNonQuery();
sqltran.Commit();
// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();

}
catch (Exception ex)
{
try
{
sqltran.Rollback();
}
catch (Exception e)
{
}

string str = string.Empty;
for (int i = 0; i < commandParameters.Length - 1; i++)
{
str += commandParameters[i].ParameterName + "=" + commandParameters[i].Value.ToString() + ",";
}
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString() + "参数值为:" + str, "异常日志");
retval = -1;
}
finally
{
connection.Close();
}

return retval;
}

/// <summary>
/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <returns>an int representing the number of rows affected by the command</returns>
public static int ExecuteNonQuery(MySqlTransaction transaction, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteNonQuery(transaction, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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(MySqlTransaction transaction, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
//cmd.CommandTimeout = 5;
//finally, execute the command.
int retval = cmd.ExecuteNonQuery();

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return retval;
}
catch (Exception ex)
{
string str = string.Empty;
if (commandParameters != null)
{
for (int i = 0; i < commandParameters.Length - 1; i++)
{
str += commandParameters[i].ParameterName + "=" + commandParameters[i].Value.ToString() + ",";
}
}
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString() + "参数值为:" + str, "异常日志");
return -1;
}
finally
{
//transaction.Connection.Close();
}
}

#endregion ExecuteNonQuery

#region ExecuteDataSet

public static DataSet ExecuteDataset(CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataset(connectionString, commandType, commandText, commandParameters);
}

/// <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)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataset(connectionString, commandType, commandText, (MySqlParameter[])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 MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();

//call the overload that takes a connection in place of the connection string
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(MySqlConnection connection, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataset(connection, commandType, commandText, (MySqlParameter[])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(MySqlConnection connection, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, (MySqlTransaction)null, commandType, commandText, commandParameters);

//create the DataAdapter & DataSet
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();

//fill the DataSet using default values for DataTable names, etc.
da.Fill(ds);

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
//return the dataset
return ds;
}
catch (Exception ex)
{
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
finally
{
connection.Close();
}
return null;
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
/// </summary>
/// <remarks>
/// e.g.:
///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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(MySqlTransaction transaction, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataset(transaction, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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(MySqlTransaction transaction, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

//create the DataAdapter & DataSet
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();

//fill the DataSet using default values for DataTable names, etc.
da.Fill(ds);

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();

//return the dataset
return ds;
}
catch (Exception ex)
{
transaction.Connection.Close();
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
return null;
}

#endregion ExecuteDataSet

#region ExecuteDataTable

public static DataTable ExecuteDataTable(CommandType commandType, string commandText)
{
return ExecuteDataTable(connectionString, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
/// the connection string.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataTable(connectionString, commandType, commandText, (MySqlParameter[])null);
}

public static DataTable ExecuteDataTable(CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();

//call the overload that takes a connection in place of the connection string
return ExecuteDataTable(cn, commandType, commandText, commandParameters);
}
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();

//call the overload that takes a connection in place of the connection string
return ExecuteDataTable(cn, commandType, commandText, commandParameters);
}
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(MySqlConnection connection, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataTable(connection, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(MySqlConnection connection, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
cmd.CommandTimeout = 140;

PrepareCommand(cmd, connection, (MySqlTransaction)null, commandType, commandText, commandParameters);

//create the DataAdapter & DataTable
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataTable dt = new DataTable();

//fill the DataTable using default values for DataTable names, etc.
da.Fill(dt);

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();

return dt;
}
catch (Exception ex)
{
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
finally
{
connection.Close();
}
return null;
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(MySqlTransaction transaction, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteDataTable(transaction, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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 DataTable containing the resultset generated by the command</returns>
public static DataTable ExecuteDataTable(MySqlTransaction transaction, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
cmd.CommandTimeout = 140;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

//create the DataAdapter & DataTable
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataTable dt = new DataTable();

//fill the DataTable using default values for DataTable names, etc.
da.Fill(dt);

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();

//return the DataTable
return dt;
}
catch (Exception ex)
{
transaction.Connection.Close();
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
return null;
}

#endregion ExecuteDataTable

#region ExecuteReader

/// <summary>
/// this enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
/// we can set the appropriate CommandBehavior when calling ExecuteReader()
/// </summary>
private enum SqlConnectionOwnership
{
/// <summary>Connection is owned and managed by SqlHelper</summary>
Internal,

/// <summary>Connection is owned and managed by the caller</summary>
External
}

/// <summary>
/// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
/// </summary>
/// <remarks>
/// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
///
/// If the caller provided the connection, we want to leave it to them to manage.
/// </remarks>
/// <param name="connection">a valid SqlConnection, on which to execute this command</param>
/// <param name="transaction">a valid SqlTransaction, or 'null'</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 SqlParameters to be associated with the command or 'null' if no parameters are required</param>
/// <param name="connectionOwnership">indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
/// <returns>SqlDataReader containing the results of the command</returns>
private static MySqlDataReader ExecuteReader(MySqlConnection connection, MySqlTransaction transaction,
CommandType commandType, string commandText,
MySqlParameter[] commandParameters,
SqlConnectionOwnership connectionOwnership)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);

//create a reader
MySqlDataReader dr;

// call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == SqlConnectionOwnership.External)
{
dr = cmd.ExecuteReader();
}
else
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();

return dr;
}
catch (Exception ex)
{
connection.Close();
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
return null;
}

public static MySqlDataReader ExecuteReader(CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteReader(connectionString, commandType, commandText, (MySqlParameter[])null);
}

public static MySqlDataReader ExecuteReader(CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteReader(connectionString, commandType, commandText, commandParameters);
}

/// <summary>
/// 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 MySqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteReader(connectionString, commandType, commandText, (MySqlParameter[])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 dr = ExecuteReader(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 SqlDataReader containing the resultset generated by the command</returns>
public static MySqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection
MySqlConnection cn = new MySqlConnection(connectionString);
cn.Open();

try
{
//call the private overload that takes an internally owned connection in place of the connection string
return ExecuteReader(cn, null, commandType, commandText, commandParameters,
SqlConnectionOwnership.Internal);
}
catch
{
//if we fail to return the SqlDatReader, we need to close the connection ourselves
cn.Close();
throw;
}
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
/// </summary>
/// <remarks>
/// e.g.:
///  SqlDataReader dr = ExecuteReader(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 SqlDataReader containing the resultset generated by the command</returns>
public static MySqlDataReader ExecuteReader(MySqlConnection connection, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteReader(connection, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  SqlDataReader dr = ExecuteReader(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 SqlDataReader containing the resultset generated by the command</returns>
public static MySqlDataReader ExecuteReader(MySqlConnection connection, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//pass through the call to the private overload using a null transaction value and an externally owned connection
return ExecuteReader(connection, (MySqlTransaction)null, commandType, commandText, commandParameters,
SqlConnectionOwnership.External);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
/// </summary>
/// <remarks>
/// e.g.:
///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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 MySqlDataReader ExecuteReader(MySqlTransaction transaction, CommandType commandType,
string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteReader(transaction, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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 resultset generated by the command</returns>
public static MySqlDataReader ExecuteReader(MySqlTransaction transaction, CommandType commandType,
string commandText, params MySqlParameter[] commandParameters)
{
//pass through to private overload, indicating that the connection is owned by the caller
return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters,
SqlConnectionOwnership.External);
}

#endregion ExecuteReader

#region ExecuteScalar

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in
/// the connection string.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
/// </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>an object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteScalar(connectionString, commandType, commandText, (MySqlParameter[])null);
}

public static object ExecuteScalar(CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteScalar(connectionString, commandType, commandText, commandParameters);
}

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", 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 containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();

//call the overload that takes a connection in place of the connection string
return ExecuteScalar(cn, commandType, commandText, commandParameters);
}
}

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
/// </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>an object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(MySqlConnection connection, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteScalar(connection, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", 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>an object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(MySqlConnection connection, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, (MySqlTransaction)null, commandType, commandText, commandParameters);

//execute the command & return the results
object retval = cmd.ExecuteScalar();

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return retval;
}
catch (Exception ex)
{
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
finally
{
connection.Close();
}
return null;
}

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(MySqlTransaction transaction, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of SqlParameters
return ExecuteScalar(transaction, commandType, commandText, (MySqlParameter[])null);
}

/// <summary>
/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("?prodid", 24));
/// </remarks>
/// <param name="transaction">a valid SqlTransaction</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 containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(MySqlTransaction transaction, CommandType commandType, string commandText,
params MySqlParameter[] commandParameters)
{
try
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

//execute the command & return the results
object retval = cmd.ExecuteScalar();

// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return retval;
}
catch (Exception ex)
{
transaction.Connection.Close();
Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
}
return null;
}

#endregion ExecuteScalar

}