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This article looks at the range of client access mechanisms for Windows that can be used with the Recital C-ISAM Bridge and details bridge configuration and usage.

Overview

Just because the format of data is regarded as 'legacy' does not make that data in any way obsolete. Modern client interfaces can not only extend the life of long-term data, but also provide different ways to analyse and gain advantage from that data.

Recital Corporation provides a range of solutions to interface to Informix compliant C-ISAM data on Linux or UNIX from Windows clients.

.NET

Click image to display full size

Fig 1: Recital Mirage .NET application accessing the C-ISAM Demo table.


Recital offers two alternative ways to access C-ISAM data using Microsoft .NET:

The Recital .NET Data Provider is a managed Data Provider written in C# that provides full compatibility with the Microsoft SQLserver and OLE DB data providers that ship with the .NET framework. It is fully integrated with the Visual Studio .NET IDE supporting data binding and automatic code generation using the form designer. The Recital .NET Data Provider works in conjunction with the Recital Database Server for Linux or UNIX to access C-ISAM data.

Recital Mirage .NET is a complete solution for migrating, developing and deploying 4GL database applications. Recital Mirage .NET works in conjunction with the Recital Mirage .NET Application Server for Linux or UNIX to access C-ISAM data.

JDBC

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Fig 2: Java™ Swing JTable accessing the C-ISAM Demo table via the Recital JDBC Driver.


The Recital JDBC Driver is an all Java Type 4 JDBC 3.0 Driver, allowing you to access C-ISAM data from Java applets and applications. The Recital JDBC Driver works in conjunction with the Recital Database Server for Linux or UNIX to access C-ISAM data.

ODBC

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Fig 3: Microsoft® Office Excel 2003 Pivot Chart and Pivot Table accessing the C-ISAM Demo table via the Recital ODBC Driver.


The Recital ODBC Driver is an ODBC 3.0 Driver, allowing you to access C-ISAM data from your preferred ODBC based Windows applications. You can develop your own applications in languages such as C++ or Visual Basic, manipulate the data in a spreadsheet package or word processor document and design charts, graphs and reports. The Recital ODBC Driver works in conjunction with the Recital Database Server for Linux or UNIX to access C-ISAM data.

Configuring the Recital C-ISAM Bridge

Data access is achieved through a C-ISAM Bridge.  This requires the creation of an empty Recital table that has the same structure as the C-ISAM file and of a RecitalC-ISAM Bridge file.

On Linux and UNIX, Recital Terminal Developer and the Recital Database Server come complete with an example C-ISAM data file, C-ISAM index and Recital C-ISAM bridge that can be used for testing and as a template for configuring your own C-ISAM bridges.  The Recital Database Server also includes a bridge creation ini file.

Step 1:

Create a Recital table with the same structure as the C-ISAM file.  The fields/columns in the structure file must exactly match the data type and length of those in the C-ISAM file.  The Recital table will have one byte more in total record length due to the Recital record deletion marker.

To create the table, use the SQL CREATE TABLE command or the Recital Terminal Developer CREATE worksurface.  The SQL CREATE TABLE command can be called directly:

SQLExecDirect:
  In:      hstmt = 0x00761BE8,
    szSqlStr = "CREATE TABLE cisamdemo.str (DD Char(4)
              DESCRIPTION "Dd...", cbSqlStr = -3
  Return:  SQL_SUCCESS=0

or be included in a 4GL program:

// createtab.prg
CREATE TABLE cisamdemo.str;
    (DD Char(4) DESCRIPTION "Dd",;
     CONFIRM Char(6) DESCRIPTION "Confirm",;
     PROCDATE Char(6) DESCRIPTION "Procdate",;
     CONTROL Char(5) DESCRIPTION "Control",;
     DOLLARS Decimal(13,2) DESCRIPTION "Dollars",;
     DEALER Char(5) DESCRIPTION "Dealer",;
     TERRITORY Char(2) DESCRIPTION "Territory",;
     WOREP Char(12) DESCRIPTION "Worep",;
     CURRTRAN Char(3) DESCRIPTION "Currtran",;
     TRADDATE Char(6) DESCRIPTION "Traddate",;
     CITY Char(10) DESCRIPTION "City",;
     ACCOUNT Char(11) DESCRIPTION "Account",;
     PRETRAN Char(2) DESCRIPTION "Pretran",;
     AFSREP Char(14) DESCRIPTION "Afsrep",;
     REPKEY Char(9) DESCRIPTION "Repkey",;
     BRANCH Char(3) DESCRIPTION "Branch",;
     WODEALER Char(5) DESCRIPTION "Wodealer",;
     BANKCODE Char(2) DESCRIPTION "Bankcode",;
     COMMRATE Decimal(6,4) DESCRIPTION "Commrate",;
     NEWREP Char(1) DESCRIPTION "Newrep",;
     SETTLE Char(1) DESCRIPTION "Settle",;
     POSTDATE Char(6) DESCRIPTION "Postdate")
if file("cisamdemo.str")
    return .T.
else
    return .F.
endif
// end of createtab.prg

Server-side 4GL programs can be called by all clients, e.g. from a Java class with a JDBC connection:

//---------------------------------
//-- create_str.java --
//---------------------------------
import java.sql.*;
import java.io.*;
import Recital.sql.*;

public class create_str {

  public static void main(String argv[]) {
    try {
      new RecitalDriver();
      String url = "jdbc:Recital:" +
        "SERVERNAME=cisamserver;" +
        "DIRECTORY=/usr/recital/data/southwind;" +
        "USERNAME=user;" +
        "PASSWORD=password";
      Connection con = DriverManager.getConnection(url, "user", "pass");
      Statement stmt = con.createStatement();

      CallableStatement sp = con.prepareCall("{call createtab}");
      boolean res = sp.execute();
      String outParam = sp.getString(1);
      System.out.println("Returned "+outParam);
      sp.close();
      con.close();
    } catch (Exception e) {
      System.out.flush();
      System.err.flush();
      DriverManager.println("Driver exception: " + e.getMessage());
      e.printStackTrace();
    }
    try {
      System.out.println("Press any key to continue...");
      System.in.read();
    } catch(IOException ie) {
      ;
    }
  }
}

The table should be given a ‘.str’ file extension (rather than the default ‘.dbf’) to signify that this is a structure file only.

Please see the end of this article for information on matching Informix and Recital data types



Fig 4: Recital CREATE/MODIFY STRUCTURE worksurface for character mode table creation.

Step 2: Creating the Bridge File

If you have Recital installed on the server platform, the Bridge File can be created using the CREATE BRIDGE worksurface.  The corresponding command to modify the bridge file is MODIFY BRIDGE <bridge file>.  This is the cisamdemo.dbf bridge file in the CREATE/MODIFY BRIDGE WORKSURFACE:

> modify bridge cisamdemo.dbf


Fig 5: Recital CREATE BRIDGE/MODIFY BRIDGE worksurface for bridge creation.

For Recital Database Server clients, the Bridge File can be created using the Recital/SQL CREATE BRIDGE command:

Recital/SQL CREATE BRIDGE:
CREATE BRIDGE cisamdemo.dbf;
  TYPE "CISAM";
  EXTERNAL "cisamdemo.dat";
  METADATA "cisamdemo.str";
  ALIAS "cisamdemo"

or:

CREATE BRIDGE cisamdemo.dbf;
  AS "type=CISAM;external=cisamdemo.dat;metadata=cisamdemo.str;alias=cisamdemo"

The examples above assume that the C-ISAM file, the bridge file and the Recital structure file are all in the current working directory.  Full path information can be specified for the <externalname> and the <databasename>.  For added flexibility, environment variables can be used to determine the path at the time the bridge is opened.  Environment variables can be included for either or both the <externalname> and the <databasename>.  A colon should be specified between the environment variable and the file name.

e.g.

  CREATE BRIDGE cisamdemo.dbf;
  TYPE "CISAM";
  EXTERNAL "DB_DATADIR:cisamdemo";
  METADATA "DB_MIRAGE_PATH:cisamdemo.str";
  ALIAS "cisamdemo"
Recital CREATE BRIDGE/MODIFY BRIDGE worksurface:


Fig 6: Recital CREATE BRIDGE/MODIFY BRIDGE worksurface - using environment variables.

Using the Bridge

The Bridge can now be used.  To access the C-ISAM file, use the ‘alias’ specified in the Bridge definition.

SQL:
SELECT * FROM cisamdemo
Recital/4GL:
use cisamdemo

Indexes

The cisamdemo.dat file included in the Recital distributions for Linux and UNIX has three associated index keys in the cisamdemo.idx file:

Select area: 1
Database in use: cisamdemo
Alias: cisamdemo
Number of records: 4
Current record: 2
File Type: CISAM (C-ISAM)
Master Index: [cisamdemo.idx key #1]
Key: DD+CONFIRM+PROCDATE+CONTROL
Type: Character
Len: 21   (Unique)
Index: [cisamdemo.idx key #2]
Key: DD+SUBSTR(CONFIRM,2,5)+TRADDATE+STR(DOLLARS,13,2) +CURRTRAN+ACCOUNT Type: Character Len: 42 Index: [cisamdemo.idx key #3] Key: DEALER+BRANCH+AFSREP+SUBSTR(PROCDATE,5,2) +SUBSTR(CONTROL,2,4) Type: Character Len: 28

The Recital C-ISAM bridge makes full use of the C-ISAM indexes.  SQL SELECT statements with WHERE clauses are optimized based on any of the existing indexes when possible.  The following ODBC SELECT call makes use of key #3 rather than sequentially searching through the data file.

SQLExecDirect:
  In:      hstmt = 0x00761BE8,
    szSqlStr = "select * from cisamdemo
      where dealer+branch+afsrep=' 00161   595-7912",
      cbSqlStr = -3
  Return:  SQL_SUCCESS=0

Get Data All:

"DD", "CONFIRM", "PROCDATE", "CONTROL", "DOLLARS", "DEALER", 
"TERRITORY", "WOREP", "CURRTRAN", "TRADDATE", "CITY", "ACCOUNT", 
"PRETRAN", "AFSREP", "REPKEY", "BRANCH", "WODEALER", "BANKCODE", 
"COMMRATE", "NEWREP", "SETTLE", "POSTDATE"

"0159", " 15522", "930312", "13356", 4992.60, "00161", "19", 
"", "210", "930305", "", "70000100009", "", "595-7912", 
"930315791", "", "", "59", 0.0000, "1", "", "930315"
1 row fetched from 22 columns.

Using the Recital/4GL, the primary index is set as the master index when the bridge is first opened.  Any secondary indexes can be selected using the SET ORDER TO <expN> command.  The Recital/4GL SEEK or FIND commands and SEEK() function can be used to search in the current master index.

> SET ORDER TO 3
Master index: [cisamdemo.idx key #3]
> SEEK “00161   595-7912”

Appendix 1: Data Types

Informix

Recital

Byte

Numeric

Char

Character

Character

Character

Date

Date

Datetime

Character

Decimal

Numeric

Double Precision

Float

Float

Real

16 Bit Integer

Short

Integer

Numeric

Interval

Character

32 Bit Long

Integer

Money

Numeric

Numeric

Numeric

Real

Numeric

Smallfloat

Numeric

Smallint

Numeric

Text

Unsupported

Varchar

Character

Appendix 2: C-ISAM RDD Error Messages

The following errors relate to the use of the Recital CISAM Replaceable Database Driver (RDD).  They can be received as an ‘errno <expN>’ on Recital error messages:


ERRNO()

Error Description

100

Duplicate record

101

File not open

102

Invalid argument

103

Invalid key description

104

Out of file descriptors

105

Invalid ISAM file format

106

Exclusive lock required

107

Record claimed by another user

108

Key already exists

109

Primary key may not be used

110

Beginning or end of file reached

111

No match was found

112

There is no “current” established

113

Entire file locked by another user

114

File name too long

115

Cannot create lock file

116

Memory allocation request failed

117

Bad custom collating

118

Duplicate primary key allowed

119

Invalid transaction identifier

120

Exclusively locked in a transaction

121

Internal error in journaling

122

Object not locked

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Usually, you do not need to setup an email server under Linux. Most GUI email clients support Gmail POP3 and IMAP configurations. But, how do you send mail via the standard /usr/bin/mail user agents in a shell script? Programs such as sendmail / postfix / exim can be configured as a gmail smarthost but they are largely overkill for this use. The ssmtp program is a neat utility that does just that for you via gmail.

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Subclipse is an Eclipse Team Provider plug-in providing support for Subversion within the Eclipse IDE. This plugin is required in order to use the recital eclipse workspace.
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I Just added a few new functions to the latest 10.0.1 patch release which should be generally available next week.
  1. New MD5( expC ) function to calculate an MD5 crypto key from any character expression
  2. New MD5FILE( expC ) function calculates an MD5 crypto key for a given filename. If the filename is a pattern e.g *.* it will calculate the key across all files matching the pattern
  3. New mod_recital.so available for using Recital Web on linux x86_32
  4. New mod_recital64.so available for using Recital Web on linux x86_64 
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A number of people have complained about data loss after a system crash when using Ext4.  A bug report was logged. According to multiple posts by a developer of Ext4, Theodore Tso, this is due to differences in approach to security and performance issues between the two file systems.

Ext3 commits writes to disk within approximately 5 seconds - Ext4 can take from 40-150 seconds.  In addition, if a system is using Ext3 and crashes before the commit takes place you will still have the previous contents of a file where under Ext4 the file will be empty.  Theodore Tso feels that this is a failure at the application level and that the file system is behaving as designed and as specified by the POSIX spec (which apparently does not specify what is supposed to happen when a system is not shut down cleanly).  His solution to the issue is to suggest proper use of fsync() and lists various scenarios/examples in post 54 of the bug report (linked above).  In addition he wrote a patch that recognize the rename() situation mentioned in his post 54 yet retains the normal Ext4 behaviors and performance in the majority of cases.  Also a more "proper" solution has been provided which allows the behavior of Ext3 to be retained under Ext4 by mounting it with alloc_on_commit.

A somewhat related topic is the use of on-board caching by hard drives.  This behavior can be modified on most drives by using hdparm.
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In this article Barry Mavin, CEO and Chief Software Architect for Recital provides details on how the Recital Database Server can be used to provide a solution for Universal Data Integration.

Overview

The Recital Database Server handles universal cross-platform data access to a wide range of data sources. The database server natively handles full remote SQL data access to Recital, Visual FoxPro, FoxPro, FoxBASE, Clipper and older dBase data. Using Bridges, it handles full remote SQL data access to C-ISAM and OpenVMS RMS. Using gateway connections, it handles full remote SQL data access to Oracle, MySQL, PostgreSQL, SQL Server, server-side ODBC, server-side JDBC and server-side OLE DB data sources. With its ability to access data using server-side ODBC, JDBC and OLE DB drivers from clients on all supported operating systems (Windows, Linux, Unix, OpenVMS), the Recital Database Server is an ideal Data Integration Solution for applications of all sizes and complexity.

Universal Data Integration Solutions

There are several ways in which data may be accessed by the Database Server.

Table 1:

Client Universal Data Access solutions for accessing local or remote data.


Client Solution
Recital Use remote gateway connections
Visual FoxPro Use the Universal ODBC Driver
Java (all platforms) Use the Universal JDBC Driver
.NET Framework Use the Universal .NET Data Provider
Microsoft Office Use the Universal ODBC Driver
Windows Mobile Use the Universal Compact Framework .NET Data Provider
PHP on Linux Use the Universal ODBC Driver for Linux
Mono on Linux Use the Universal .NET Data Provider
Others If the data source you want to access is not in the list above, then you can use a remote ODBC, JDBC or OLE DB gateway.
You can find examples of connection strings for most ODBC and OLE DB data sources by clicking here.

Table 2:

Windows Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
C-ISAM Use a bridge (See table 1)
Access Use a gateway connection
gateway="oledb:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;User Id=admin;Password=;"
Exchange Use a gateway connection
gateway="oledb:Provider=ExOLEDB.DataSource;Data Source=http://servername/publicstore"
Excel Use a gateway connection
gateway="oledb:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;"
Oracle Use a gateway connection
gateway="oledb:Provider=msdaora;Data Source=TheOracleDB;User Id=xxxxx;Password=xxxxx;"
SQL Server Use a gateway connection
gateway="oledb:Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"
MySQL Use a gateway connection
gateway="oledb:Provider=MySQLProv;Data Source=mydb;User Id=xxxxx;Password=xxxxx;"
IBM DB2 Use a gateway connection
gateway="oledb:Provider=DB2OLEDB;Network Transport Library=TCPIP;Network Address=XXX.XXX.XXX.XXX;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"
Sybase ASA Use a gateway connection
gateway="oledb:Provider=ASAProv;Data source=myASA"
Sybase ASE Use a gateway connection
gateway="oledb:Provider=Sybase.ASEOLEDBProvider;Srvr=myASEserver,5000;Catalog=myDBname;User Id=username;Password=password"
IBM Informix Use a gateway connection
gateway="oledb:Provider=Ifxoledbc.2;password=myPw;User ID=myUser;Data Source=dbName@serverName;Persist Security Info=true"
Ingres Use a gateway connection
gateway="odbc:dsn=data_source_name"
Firebird Use a gateway connection
gateway="odbc:dsn=data_source_name"
IBM AS400 iSeries Use a gateway connection
gateway="oledb:PROVIDER=IBMDA400; DATA SOURCE=MY_SYSTEM_NAME;USER ID=myUserName;PASSWORD=myPwd"
Interbase Use a gateway connection
gateway="oledb:provider=sibprovider;location=localhost:;data source=c:\databases\gdbs\mygdb.gdb;user id=xxxxx;password=xxxxx"
Others

If the data source you want to access is not in the list above, then you can use server-side ODBC, JDBC or OLE DB.
You can find examples of connection strings for most ODBC and OLE DB data sources by clicking here.
Full details on using server-side JDBC drivers can be found here.
Full details on using server-side ODBC drivers can be found here.
Full details on using server-side OLE DB drivers can be found here.


Table 3:

Linux and Unix Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
C-ISAM Use a bridge (See table 1)
Oracle Use a gateway connection
gateway="oracle:Connection_String"
MySQL Use a gateway connection
gateway="mysql:Connection_String"
IBM DB2 Use a gateway connection
gateway="db2:Connection_String"
PostgreSQL Use a gateway connection
gateway="postgres:Connection_String"
Others

If the data source you want to access is not in the list above, then you can use a server-side JDBC driver.
Full details on using server-side JDBC drivers can be found here.


Table 4:

OpenVMS Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
RMS Use a bridge (See table 1)
Others

If the data source you want to access is not in the list above, then you can use a server-side JDBC driver.

Supported Data Sources

Native Data Access

The Recital Database Server has native built-in support for the following data sources:

  • Recital
  • Visual FoxPro
  • FoxPro
  • FoxBASE
  • Clipper
  • dBase

You can setup tables to work with using the Database Administration Tool in Recital Enterprise Studio.

Bridges

Using Bridges, you can access the following data sources as if they were standard Recital/FoxPro tables:

  • CISAM
  • OpenVMS RMS

You can setup bridges using the Database Administration Tool in Recital Enterprise Studio.

Gateways/Connections

Using Gateways, you can transparently access the following local or remote data sources:

  • Recital
  • Oracle
  • ODBC (Server-side ODBC data sources)
  • JDBC (Server-side JDBC data sources)
  • OLEDB Use this to connect to SQL Server and other Windows OLE DB data sources)
  • MySQL
  • PostgreSQL

Remote Data Object functions

Recital 10 includes a complete and robust set of data source independent functions for accession MySQL, Oracle, DB2 and Postgres. This article explains how to use them.

Client Data Access drivers

Included with the Recital Database Server are three Client drivers. These Client drivers can access any data sources supported by the Recital Database Server. They are not restricted to accessing only Recital data. They can be used to access server-side ODBC, JDBC and OLE DB data sources also.

Recital Universal .NET Data Provider

Use this client driver when building .NET applications with Visual Studio .NET. A data provider in the .NET Framework serves as a bridge between an application and a data source. A data provider is used to retrieve data from a data source and to reconcile changes to that data back to the data source.

Key features of the Recital Universal .NET Data Provider:

  • Fully Internet enabled
    The Recital Universal .NET Data Provider works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • SQL Server compatible
    The Recital Universal .NET Data Provider is plug compatible with the .NET Framework SQL Server Data Provider.
  • Cross-platform Data Integration
    Using the Recital Universal .NET Data Provider, you can connect to remote Windows, Linux, Unix or OpenVMS servers and access any data source supported by the Recital Database Server.
  • Managed code
    The Recital Universal .NET Data Adaptor written in C# is 100% .NET Framework managed code.
  • Runs on Windows Mobile
    The Recital Universal .NET Data Adaptor runs under the .NET Compact Framework on Windows Mobile.
Recital Universal JDBC Driver

The JDBC API is the industry standard for database-independent connectivity between the Java programming language and a wide range of databases. The JDBC API provides a call-level API for SQL-based database access. JDBC technology allows you to use the Java programming language to exploit "Write Once, Run Anywhere" capabilities for applications that require access to enterprise data.

Key features of the Recital Universal JDBC Driver:

  • Fully Internet enabled
    The Recital Universal JDBC driver works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • JDBC 3.0 API
    The Recital Universal JDBC driver supports the JDBC 3.0 API.
  • Pure Java Type 3 Driver
    The Recital Universal JDBC driver is a 100% pure Java Type 3 driver.
  • Full Access to Metadata
    The JDBC API provides metadata access that enables the development of sophisticated applications that need to understand the underlying facilities and capabilities of a specific database connection.
  • Cross-platform Data Integration
    Using the Recital Universal JDBC driver, you can connect to remote Windows, Linux, Unix or OpenVMS servers and access any data source supported by the Recital Database Server.
  • No Installation
    A pure JDBC technology-based driver does not require special installation; it is automatically downloaded as part of the applet that makes the JDBC calls. The Recital Universal JDBC Driver is 100% java.
Recital Universal ODBC Driver

Connect to remote data from Microsoft Office or other applications that support ODBC data access. The Recital Universal ODBC Driver is also available for Linux and Unix.

Key features of the Recital Universal ODBC Driver:

  • Fully Internet enabled
    The Recital Universal ODBC driver works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • Works with Crystal Reports
    The Recital Universal ODBC driver supports the SQL syntax generated by Crystal Reports.
  • Works with Microsoft Office
    The Recital Universal ODBC driver works with Microsoft Office products.
  • Works with PHP on Linux
    The Recital Universal ODBC driver is available for Linux and works with PHP.
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Dave Michelle at ITPRO writes a good review of the DS3400 San here.
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A good article describing the configuration of samba for file/record locking can be found here.

Basically you must add these directives to the smb.conf file:

[data] 
oplocks = False 
level2 oplocks = False

The default oplock type is Level1. Level2 oplocks are enabled on a per-share basis in the smb.conf file. Alternately, you could disable oplocks on a per-file basis within the share: 

veto oplock files = /*.dbf/*.DBF/*.ndx/*.NDX/*.dbx/*.DBX/*.dbt/*.DBT/

You can further tune samba by following this guide.

If you specify the Common Internet File System (CIFS) when you mount the samba share then you must specify the following options
mount -t cifs {mount-point} -o username=name,pass=pass,directio
The directio option is used to not do inode data caching on files opened on this mount. This precludes mmaping files on this mount. In some cases with fast networks and little or no caching benefits on the client (e.g. when the application is doing large sequential reads bigger than page size without rereading the same data) this can provide better performance than the default behavior which caches reads (readahead) and writes (writebehind) through the local Linux client pagecache if oplock (caching token) is granted and held. Note that direct allows write operations larger than page size to be sent to the server.

If you get the following error when trying to mount the {mount-point}
Apr 22 16:57:39 bailey kernel: Status code returned 0xc000006d NT_STATUS_LOGON_FAILURE
Apr 22 16:57:39 bailey kernel:  CIFS VFS: Send error in SessSetup = -13
Apr 22 16:57:39 bailey kernel:  CIFS VFS: cifs_mount failed w/return code = -13
The you need to create the Samba user specified on the mount command
smbpasswd -a username
FYI - Make sure you umount all the Samba {mount-point(s)} before shutting down Samba.
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SE Linux is a feature of the Linux kernel that provides mandatory access control. This policy based access control system grants far greater control over the resources on a machine than standard Linux access controls such as permissions.

Many modern Linux distributions are shipping with SELinux enabled by default, Fedora 14 and Rhel 6 both install with it enabled.

When you run Recital Web on a SELinux enabled machine and navigate to the default.rsp page you will see something similar to the screen shot below.

1
If you launch the SELinux troubleshooter you will see the following problem.

SELinux is blocking the apache server from accessing the Recital server running on port 8001.

2
To manage you SELinux policy you must have the policycoreutils package group installed. The policycoreutils contains the policy core utilities that are required for basic operation of a SELinux system.

If you wish to use a GUI tool, you must install the policycoreutils-gui package.

At the command prompt execute the following:

As root

$ yum install policycoreutils

$ semanage port -a -t http_port_t -p tcp 8001

$ service recital restart

$ service httpd restart 
 

We use the semanage command here to allow the http server access to port 8001. Once you have completed the steps detailed above you can go and navigate back to the default.rsp page in your borwser, where you will find the permission denied message is now replaced by the default.rsp page.


4
SELinux does a great job of restricting services and daemons so rather than simply disabling it, why not work with it!

When it comes to security, every little bit helps...

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When the node is clicked set editable to false. Set editable to true in the double-click event handler.
// the click event handler 
private function onclick_sourcetree(e:Event):void  {     
    yourTree.editable = false; 
}  

// the doubleclick event handler  
private function ondoubleclick_sourcetree(e:Event):void  {     
    yourTree.editable = true;    
    yourTree.editedItemPosition = {columnIndex:0, rowIndex:sourceTree.selectedIndex}; 
} 
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