/// <summary>
/// 预处理用户提供的命令,数据库连接/事务/命令类型/参数
/// </summary>
/// <param>要处理的DbCommand</param>
/// <param>数据库连接</param>
/// <param>一个有效的事务或者是null值</param>
/// <param>命令类型 (存储过程,命令文本, 其它.)</param>
/// <param>存储过程名或都T-SQL命令文本</param>
/// <param>和命令相关联的DbParameter参数数组,如果没有参数为'null'</param>
/// <param><c>true</c> 如果连接是打开的,则为true,其它情况下为false.</param>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="cmdParams"></param>
/// <param name="mustCloseConn"></param>
private static DbCommand PrepareCmd(CommandType cmdType, string cmdText, DbParameter[] cmdParams, out bool mustCloseConn)
{
DbCommand cmd = _dataProviders.GetDbCommand(cmdText);
DbConnection conn;
if (_transConnectionObj != null)
{
conn = _transConnectionObj.MyDbTransaction.Connection;
cmd.Transaction = _transConnectionObj.MyDbTransaction;
mustCloseConn = false;
}
else
{
conn = _dataProviders.GetDbConnection(_dataProviders.ConnectionString);
mustCloseConn = true;
}
cmd.Connection = conn;
cmd.CommandType = cmdType;
AttachParameters(cmd, cmdParams);
return(cmd);
}
