|
er[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
object result = null;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库事务查询操作,返回结果集中位于第一行第一列的Object类型的值
/// </summary>
/// <param name="transaction">一个已存在的数据库事务对象</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前事务查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
internal static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("当前数据库事务不存在");
OracleConnection connection = transaction.Connection;
if (connection == null) throw new ArgumentException("当前事务所在的数据库连接不存在");
OracleCommand command = new OracleCommand();
object result = null;
try
{
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
transaction.Dispose();
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库查询操作,返回结果集中位于第一行第一列的Object类型的值
/// </summary>
/// <param name="connection">数据库连接对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
internal static object ExecuteScalar(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
if (connection == null) throw new ArgumentException("当前数据库连接不存在");
OracleCommand command = new OracleCommand();
object result = null;
try
{
PrepareCommand(command, connection, null, cmdType, cmdText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库命令前的准备工作
/// </summary>
/// <param name="command">Command对象</param>
/// <param name="connection">数据库连接对象</param>
/// <param name="trans">事务对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="command |