Question

我正在执行oracle查询并将所述查询的结果写入txt文件。

现在我需要在处理自定义查询时更改架构（由布尔值isCustom设置）

模式正在更改并且正在执行查询但由于某种原因查询输出未写入输出文件。

如果isCustom设置为false，则一切正常。

我会很感激任何建议/提示。

public void OracleConnect(string queryString, string fileName, bool isCustom = false)
    {
        //downloaded oracle managed data access.dll
        //changed reference
        //changed connection to long unfunny one
        //http://stackoverflow.com/questions/659341/the-provider-is-not-compatible-with-the-version-of-oracle-client#25412992
        log.Debug("Task " + Task.CurrentId + ": executing " + queryString);
        string oradb = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=" + host + ")(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=" + instance + ")));User Id = " + oracleUser + "; Password =" + oraclePassword;
        try
        {
            //create connection
            OracleConnection conn = new OracleConnection(oradb);
            conn.Open();

            OracleCommand cmd = new OracleCommand();
            //if a custom query is being handled change the schema 
            if (isCustom == true)
            {
                log.Debug("##Test executing custom query!");
                string changeSessionString = "ALTER SESSION SET CURRENT_SCHEMA = " + resultUser;
                 cmd.CommandText =
                    "begin " +
                        "  execute immediate '"+ changeSessionString +"';" +
                        "  execute immediate '"+ queryString+"';" +
                     "end;";
                log.Debug("##Test custom query command = " + cmd.CommandText);
            }
            else
            {
                queryString = queryString.Replace("%pumaUser%", resultUser);
                cmd.CommandText = queryString;
            }

            cmd.Connection = conn;
            cmd.CommandType = CommandType.Text;

            OracleDataReader reader = cmd.ExecuteReader();

            //get and write content to file
            List<string> columnName = new List<string>();
            columnName = GetColumnNames(reader);
            using (StreamWriter writer = new StreamWriter(fileName))
            {
                //write query command to file
                writer.WriteLine(queryString + Environment.NewLine);

                //write header / column names into first line
                StringBuilder header = new StringBuilder();
                for (int i = 0; i < columnName.Count; i++)
                {
                    header.Append(columnName[i].ToString());

                    if (i != columnName.Count - 1)
                        header.Append("\t");

                }
                writer.WriteLine(header);

                //fill rest of lines with data
                while (reader.Read())
                {
                    StringBuilder row = new StringBuilder();
                    for (int i = 0; i < reader.FieldCount; i++)
                    {
                        row.Append(reader[i]);

                        if (i != reader.FieldCount - 1)
                            row.Append("\t");
                    }
                    writer.WriteLine(row);
                }

            }
            log.DebugFormat("Task: {0} Writing query result into file: {1}", Task.CurrentId, fileName);

            conn.Dispose();
        }
        catch (OracleException e)
        {
            log.ErrorFormat("Task {0} had an OracleError: {1}", Task.CurrentId, e.Message);
            Helpers.writeErrorFile(fileName, e.Message);
        }
        catch (Exception e)
        {
            log.ErrorFormat("Task {0} Could not connect to database: {1} ", Task.CurrentId, e.Message);
        }
    }

Answer 1

> -for pl/sql procedures:   set serveroutput on

将输出写入文本文件

>     1.spool <location\xxx.txt>   after finishing 
>     2.spool off

输出多个查询

1 个答案: