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C# - 닷넷 응용 프로그램에서 DB2 Express-C 데이터베이스 사용 (3) - ibmcom/db2express-c 컨테이너 사용

지난 글에서는,

C# - 닷넷 응용 프로그램에서 DB2 Express-C 데이터베이스 사용 (2)
; https://www.sysnet.pe.kr/2/0/1408

윈도우에 생성한 DB2 환경을 예로 들었는데 이번에는 docker에 이미 설치된 "ibmcom/db2express-c" 컨테이너로 예를 들겠습니다. 이를 위해 db2 환경이 실행 중인 컨테이너 내에 bash를 실행시켜 들어갑니다.

# docker ps  | grep db2
a3cf35df65ba db2_db "/entrypoint.sh db2s…"   5 months ago  Up 13 days  22/tcp, 0.0.0.0:50000->50000/tcp  db2_db_1

// ibmcom/db2express-c 이미지가 실행 중인 컨테이너 ID: a3cf35df65ba

# docker exec -it a3cf35df65ba /bin/bash

그래도 혹시 모르니 db2가 적절하게 설치되었는지 db2val을 찾아,

# find / -name db2val
/home/db2inst1/sqllib/bin/db2val

확인해 보고,

# /home/db2inst1/sqllib/bin/db2val
DBI1379I  The db2val command is running. This can take several minutes.

DBI1335I  Installation file validation for the DB2 copy installed at
      /home/db2inst1/sqllib was successful.

DBI1343I  The db2val command completed successfully. For details, see
      the log file /tmp/db2val-200305_062706.log.

이후 db2 실행 파일을 찾아 DB 제어를 위한 명령행 환경으로 진입합니다.

# find / -name db2
/home/db2inst1/sqllib/bin/db2
...[생략]...

# /home/db2inst1/sqllib/bin/db2
...[생략]...

db2 =>

db2 명령행까지 들어왔다면 이제 게임 끝이군요, (아래의 예는 생성된 DB 목록을 조회하는 것으로) 여타 DB 관리처럼 이후 진행을 하면 됩니다.

db2 => list db directory

 System Database Directory

 Number of entries in the directory = 1

Database 1 entry:

 Database alias                       = MYTESTDB
 Database name                        = MYTESTDB
 Local database directory             = /home/db2inst1
 Database release level               = 10.00
 Comment                              =
 Directory entry type                 = Indirect
 Catalog database partition number    = 0
 Alternate server hostname            =
 Alternate server port number         =

여기까지 해서 컨테이너의 TCP 매핑, Database 이름을 구했으면 IBM.Data.DB2.dll의 DB2Connection 객체에 사용할 연결 문자열이 다음과 같이 구해집니다.

Server=testdbsrv:50000;Database=MYTESTDB;UID=...;PWD=...

이후의 제어는 그냥 편안하게 "IBM Data Studio"를 이용해 원격에서 제어하시는 것도 ^^ 좋겠습니다.




이제 환경 구성하면서 오류가 발생한 상황을 정리해 보겠습니다. 우선, DB2Connection.Open에서 다음과 같은 오류가 발생한다면?

Server Error in '/' Application.
SQL1159  Initialization error with DB2 .NET Data Provider, reason code 2, tokens C:\Test\WebApp\bin\db2app64.dll, , Process Owner: TESTAD\TESTUSR
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: SQL1159  Initialization error with DB2 .NET Data Provider, reason code 2, tokens C:\Test\WebApp\bin\db2app64.dll, , Process Owner: TESTAD\TESTUSR

Source Error:

Line 48:             {
Line 49:                 connection.ConnectionString = connectionString;
Line 50:                 connection.Open();
Line 51: 

Source File: C:\Test\WebApp\DB2Default.aspx.cs    Line: 50

Stack Trace:

[InvalidOperationException: SQL1159  Initialization error with DB2 .NET Data Provider, reason code 2, tokens C:\Test\WebApp\bin\db2app64.dll, , Process Owner: TESTAD\TESTUSR]
   IBM.Data.DB2.DB2ConnPool.Open(DB2Connection connection, String& szConnectionString, DB2ConnSettings& ppSettings, Object& ppConn) +7637
   IBM.Data.DB2.DB2Connection.Open() +577
   WebApp.DB2Default.Page_Load(Object sender, EventArgs e) in C:\Test\WebApp\DB2Default.aspx.cs:50
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1607

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4075.0}

해당 프로젝트가 빌드된 /bin 폴더에 db2app64.dll 파일이 없기 때문입니다.




IBM Data Studio에서 db2 서버의 주소, 데이터베이스, 계정 명과 비밀번호를 입력 후 "Test Connection"을 했는데 다음과 같은 오류가 발생한다면?

A connection attempt was unsuccessful.

Summary

SQL4499N  A fatal error occurred that resulted in a disconnect from the data source.

Try the following suggestions to help solve the problem:

Ensure that the data server has been started.
Check that the database name used is the actual database name and not an alias name.
Check that the host is a valid name or IP address, and that the port number is valid for communication with the data server.
To further diagnose the problem, return to the Properties section and use the Tracing page to enable tracing. Contact the database administrator and provide the trace and other support information available.
Full message content: [jcc][t4][2057][11264][4.14.113] 응용프로그램 서버(AS)가 연결을 거부했습니다. 
찾을 수 없거나 트랜잭션을 지원하지 않은 TESTDB 데이터베이스에 액세스하려고 시도했습니다.

Explanation

<b>Explanation:</b><br/><br/>An attempt was made to access a database that was not found, has not been started, or does not support transactions.
<br/><b>User response:</b><br/><br/>Ensure that the specified database name exists in the system database directory. If the database name does not exist in the system database directory, either the database does not exist or the database name has not been cataloged. If needed, issue a db2start command and then resubmit the current command.
SQLSSTATE: 08004

Support

Connection Properties

Database : TESTDB
URL :  jdbc:db2://192.168.100.50:50000/TESTDB:retrieveMessagesFromServerOnGetMessage=true;securityMechanism=4;
User name : TESTUSR
Password : (Not Shown)

Environment

Driver class name = com.ibm.db2.jcc.DB2Driver
Driver version = 4.14.113
Driver JAR file path = C:\Program Files\ibm\SDPShared\plugins\com.ibm.datatools.db2_2.1.503.v20121002_1809\driver\db2jcc4.jar;C:\Program Files\ibm\SDPShared\plugins\com.ibm.datatools.db2_2.1.503.v20121002_1809\driver\db2jcc_license_cisuz.jar
Operating system name = Windows Server 8
Operating system architecture = amd64
Operating system version = 6.2
JVM implementation vendor = IBM Corporation
JVM runtime = Java(TM) SE Runtime Environment
Java version = JRE 1.7.0 IBM J9 2.6 Windows Server 8 amd64-64 20120809_118929 (JIT enabled, AOT enabled)
J9VM - R26_Java726_SR2_20120809_0948_B118929
JIT  - r11.b01_20120808_24925
GC   - R26_Java726_SR2_20120809_0948_B118929
J9CL - 20120809_118929
Launcher = C:\Program Files\ibm\DS3.2.0\eclipse.exe

Stack Trace

com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2057][11264][4.14.113] 응용프로그램 서버(AS)가 연결을 거부했습니다. 
찾을 수 없거나 트랜잭션을 지원하지 않은 TESTDB 데이터베이스에 액세스하려고 시도했습니다.  ERRORCODE=-4499, SQLSTATE=08004com.ibm.db2.jcc.am.ed.a(Unknown Source)
com.ibm.db2.jcc.am.ed.a(Unknown Source)
com.ibm.db2.jcc.t4.y.u(Unknown Source)
com.ibm.db2.jcc.t4.y.n(Unknown Source)
com.ibm.db2.jcc.t4.y.a(Unknown Source)
com.ibm.db2.jcc.t4.y.a(Unknown Source)
com.ibm.db2.jcc.t4.b.c(Unknown Source)
com.ibm.db2.jcc.t4.b.b(Unknown Source)
com.ibm.db2.jcc.t4.b.b(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.<init>(Unknown Source)
com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.DriverConnectionBase.internalCreateConnection(Unknown Source)
org.eclipse.datatools.connectivity.DriverConnectionBase.open(Unknown Source)
org.eclipse.datatools.enablement.ibm.db2.internal.luw.JDBCLUWConnectionFactory.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage.handleTestConnection(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage.access$6(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage$10.handleEvent(Unknown Source)
org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
org.eclipse.jface.window.Window.runEventLoop(Unknown Source)
org.eclipse.jface.window.Window.open(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.actions.NewDBConnectionHandler.execute(Unknown Source)
org.eclipse.ui.internal.handlers.HandlerProxy.execute(Unknown Source)
org.eclipse.core.commands.Command.executeWithChecks(Unknown Source)
org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(Unknown Source)
org.eclipse.ui.internal.handlers.HandlerService.executeCommand(Unknown Source)
org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(Unknown Source)
org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem.access$19(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(Unknown Source)
org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
org.eclipse.ui.internal.Workbench.runEventLoop(Unknown Source)
org.eclipse.ui.internal.Workbench.runUI(Unknown Source)
org.eclipse.ui.internal.Workbench.access$4(Unknown Source)
org.eclipse.ui.internal.Workbench$7.run(Unknown Source)
org.eclipse.core.databinding.observable.Realm.runWithDefault(Unknown Source)
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Unknown Source)
org.eclipse.ui.PlatformUI.createAndRunWorkbench(Unknown Source)
org.eclipse.ui.internal.ide.application.IDEApplication.start(Unknown Source)
org.eclipse.equinox.internal.app.EclipseAppHandle.run(Unknown Source)
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown Source)
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown Source)
org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.eclipse.equinox.launcher.Main.invokeFramework(Unknown Source)
org.eclipse.equinox.launcher.Main.basicRun(Unknown Source)
org.eclipse.equinox.launcher.Main.run(Unknown Source)
org.eclipse.equinox.launcher.Main.main(Unknown Source)

데이터베이스 (위의 메시지에서는 TESTDB)가 실제로 있는지 확인할 필요가 있습니다.




또는, 다음과 같이 오류가 발생한다면?

A connection attempt was unsuccessful.

Summary

SQL4214N  A connection authorization failure has occurred.

Try the following suggestions to help solve the problem:

Ensure that the user name and password are correct. These values are defined in the New Connection wizard or, for an existing connection, on the General page in the Driver Properties section.
Ensure that the user name is valid. For example, on UNIX and Linux platforms, user names must be all lowercase. <a href="http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp?topic=/com.ibm.db2.luw.admin.dbobj.doc/doc/c0007245.html">Review the DB2 general naming rules</a>.
If you recently changed permissions on critical DB2 files, such as db2ckpw, or moved to a new fix pack, the db2iupdt command that updates the instance might not have been run. Contact your DBA to run db2iupdt with the InstName parameter to update the instance.
Full message content: [jcc][t4][201][11237][4.14.113] 연결 권한 부여에 실패했습니다. 이유: 보안 메커니즘이 지원되지 않습니다.

Explanation

<b>Explanation:</b><br/><br/>An error occurred during security processing. Either the user name specified or the password specified, or both, are invalid.
<br/><b>User response:</b><br/><br/>Ensure that the specified user name and password are correct.
SQLSSTATE: 28000

Support

Connection Properties

Database : MYTESTDB
URL :  jdbc:db2://192.168.100.50:50000/MYTESTDB:retrieveMessagesFromServerOnGetMessage=true;securityMechanism=4;
User name : TESTUSR
Password : (Not Shown)

Environment

Driver class name = com.ibm.db2.jcc.DB2Driver
Driver version = 4.14.113
Driver JAR file path = C:\Program Files\ibm\SDPShared\plugins\com.ibm.datatools.db2_2.1.503.v20121002_1809\driver\db2jcc4.jar;C:\Program Files\ibm\SDPShared\plugins\com.ibm.datatools.db2_2.1.503.v20121002_1809\driver\db2jcc_license_cisuz.jar
Operating system name = Windows Server 8
Operating system architecture = amd64
Operating system version = 6.2
JVM implementation vendor = IBM Corporation
JVM runtime = Java(TM) SE Runtime Environment
Java version = JRE 1.7.0 IBM J9 2.6 Windows Server 8 amd64-64 20120809_118929 (JIT enabled, AOT enabled)
J9VM - R26_Java726_SR2_20120809_0948_B118929
JIT  - r11.b01_20120808_24925
GC   - R26_Java726_SR2_20120809_0948_B118929
J9CL - 20120809_118929
Launcher = C:\Program Files\ibm\DS3.2.0\eclipse.exe

Stack Trace

com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][201][11237][4.14.113] 연결 권한 부여에 실패했습니다. 이유: 보안 메커니즘이 지원되지 않습니다. ERRORCODE=-4214, SQLSTATE=28000com.ibm.db2.jcc.am.ed.a(Unknown Source)
com.ibm.db2.jcc.am.ed.a(Unknown Source)
com.ibm.db2.jcc.am.ed.a(Unknown Source)
com.ibm.db2.jcc.t4.b.f(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.y.b(Unknown Source)
com.ibm.db2.jcc.t4.y.a(Unknown Source)
com.ibm.db2.jcc.t4.y.a(Unknown Source)
com.ibm.db2.jcc.t4.b.c(Unknown Source)
com.ibm.db2.jcc.t4.b.b(Unknown Source)
com.ibm.db2.jcc.t4.b.b(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.a(Unknown Source)
com.ibm.db2.jcc.t4.b.<init>(Unknown Source)
com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.DriverConnectionBase.internalCreateConnection(Unknown Source)
org.eclipse.datatools.connectivity.DriverConnectionBase.open(Unknown Source)
org.eclipse.datatools.enablement.ibm.db2.internal.luw.JDBCLUWConnectionFactory.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(Unknown Source)
org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage.handleTestConnection(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage.access$6(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.NewDatabaseConnnectionWizardPage$10.handleEvent(Unknown Source)
org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
org.eclipse.jface.window.Window.runEventLoop(Unknown Source)
org.eclipse.jface.window.Window.open(Unknown Source)
com.ibm.datatools.connection.internal.ui.databases.actions.NewDBConnectionHandler.execute(Unknown Source)
org.eclipse.ui.internal.handlers.HandlerProxy.execute(Unknown Source)
org.eclipse.core.commands.Command.executeWithChecks(Unknown Source)
org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(Unknown Source)
org.eclipse.ui.internal.handlers.HandlerService.executeCommand(Unknown Source)
org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(Unknown Source)
org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem.access$19(Unknown Source)
org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(Unknown Source)
org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
org.eclipse.ui.internal.Workbench.runEventLoop(Unknown Source)
org.eclipse.ui.internal.Workbench.runUI(Unknown Source)
org.eclipse.ui.internal.Workbench.access$4(Unknown Source)
org.eclipse.ui.internal.Workbench$7.run(Unknown Source)
org.eclipse.core.databinding.observable.Realm.runWithDefault(Unknown Source)
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Unknown Source)
org.eclipse.ui.PlatformUI.createAndRunWorkbench(Unknown Source)
org.eclipse.ui.internal.ide.application.IDEApplication.start(Unknown Source)
org.eclipse.equinox.internal.app.EclipseAppHandle.run(Unknown Source)
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown Source)
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown Source)
org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.eclipse.equinox.launcher.Main.invokeFramework(Unknown Source)
org.eclipse.equinox.launcher.Main.basicRun(Unknown Source)
org.eclipse.equinox.launcher.Main.run(Unknown Source)
org.eclipse.equinox.launcher.Main.main(Unknown Source)

접속 계정의 ID나 비밀번호를 다시 체크해 볼 필요가 있습니다.




[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]





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[최종 수정일: 3/5/2020 ]

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이 저작물은 크리에이티브 커먼즈 코리아 저작자표시-비영리-변경금지 2.0 대한민국 라이센스에 따라 이용하실 수 있습니다.
by SeongTae Jeong, mailto:techsharer@outlook.com

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11930정성태6/26/20191814.NET Framework: 842. .NET Reflection을 대체할 System.Reflection.Metadata 소개
11929정성태6/5/20191285.NET Framework: 841. Windows Forms/C# - 클립보드에 RTF 텍스트를 복사 및 확인하는 방법
11928정성태6/5/20191227오류 유형: 543. PowerShell 확장 설치 시 "Catalog file '[...].cat' is not found in the contents of the module" 오류 발생
11927정성태6/5/20191484스크립트: 15. PowerShell ISE의 스크립트를 복사 후 PPT/Word에 붙여 넣으면 한글이 깨지는 문제 [1]
11926정성태6/4/20191977오류 유형: 542. Visual Studio - pointer to incomplete class type is not allowed
11925정성태6/4/20191693VC++: 131. Visual C++ - uuid 확장 속성과 __uuidof 확장 연산자파일 다운로드1
11924정성태5/30/20191845Math: 57. C# - 해석학적 방법을 이용한 최소 자승법 [1]파일 다운로드1
11923정성태5/30/20191595Math: 56. C# - 그래프 그리기로 알아보는 경사 하강법의 최소/최댓값 구하기파일 다운로드1
11922정성태5/30/20191098.NET Framework: 840. ML.NET 데이터 정규화파일 다운로드1
11921정성태5/28/20191824Math: 55. C# - 다항식을 위한 최소 자승법(Least Squares Method)파일 다운로드1
11920정성태5/28/20191230.NET Framework: 839. C# - PLplot 색상 제어
11919정성태5/27/20191753Math: 54. C# - 최소 자승법의 1차 함수에 대한 매개변수를 단순 for 문으로 구하는 방법 [1]파일 다운로드1
11918정성태5/27/20191846Math: 53. C# - 행렬식을 이용한 최소 자승법(LSM: Least Square Method)파일 다운로드1
11917정성태5/24/20191761Math: 52. MathNet을 이용한 간단한 통계 정보 처리 - 분산/표준편차파일 다운로드1
11916정성태5/24/20191243Math: 51. MathNET + OxyPlot을 이용한 간단한 통계 정보 처리 - Histogram파일 다운로드1
11915정성태5/24/20191469Linux: 11. 리눅스의 환경 변수 관련 함수 정리 - putenv, setenv, unsetenv
11914정성태5/24/20192031Linux: 10. 윈도우의 GetTickCount와 리눅스의 clock_gettime파일 다운로드1
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