HOWTO: Fix subversion error "working copy admin area is missing"

Occasionally subversion can get itself confused about what is and what is not in a working copy. This usually occurs if you have replaced the contents of a directory such as when you upgrade a component in Joomla!

You receive a message such containing this:

"working copy admin area is missing"

How to resolve this:

Step 1 -- Rename the directory that is causing the error from a shell prompt and prefix it with __

mv com_docman __com_docman

Step 2 -- Using your subversion client refresh your working copy, then "update" the directory that is causing the problem e.g. update com_docman.

Step 3 -- Now you can commit the __com_docman directory.

After you have done this follow these steps, using your subversion client:

Step 4 -- delete the com_docman directory from your working copy

Step 5 -- rename __com_docman back to com_docman

Now "commit all" and both your working copy and repository will be in sync.

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Working with Stored Procedures in the Recital Database Server

In this article Barry Mavin, CEO and Chief Software Architect for Recital, details Working with Stored Procedures in the Recital Database Server.

Overview

Stored procedures and user-defined functions are collections of SQL statements and optional control-of-flow statements written in the Recital 4GL (compatible with VFP) stored under a name and saved in a Database. Both stored procedures and user-defined functions are just-in-time compiled by the Recital database engine. Using the Database Administrator in Recital Enterprise Studio, you can easily create, view, modify, and test Stored Procedures, Triggers, and user-defined functions

Creating and Editing Stored Procedures

To create a new Stored Procedure, right-click the Procedures node in the Databases tree of the Project Explorer and choose Create. To modify an existing stored procedure select the Stored Procedure in the Databases Tree in the Project Explorer by double-clicking on it or selecting Modify from the context menu . By convertion we recommend that you name your Stored Procedures beginning with "sp_xxx_", user-defined functions with "f_xxx_", and Triggers with "dt_xxx_", where xxx is the name of the table that they are associated with.

Testing the Procedure

To test run the Stored Procedure, select the Stored Procedure in the Databases Tree in the Project Explorer by double-clicking on it. Once the Database Administrator is displayed, click the Run button to run the procedure.

Getting return values

Example Stored Procedure called "sp_myproc":

parameter arg1, arg2
return arg1 + arg2

Example calling the Stored Procedure from C# .NET:

////////////////////////////////////////////////////////////////////////
// include the references below
using System.Data;
using Recital.Data;

////////////////////////////////////////////////////////////////////////
// sample code to call a Stored Procedure that adds to numeric values together
public int CallStoredProcedure()
{
	RecitalConnection conn = new 
		RecitalConnection("Data Source=localhost;Database=southwind;uid=?;pwd=?");
	RecitalCommand cmd = new RecitalCommand();
	cmd.Connection = conn;
	cmd.CommandText = "sp_myproc(@arg1, @arg2)";
	cmd.CommandType = CommandType.StoredProcedure;
	cmd.Parameters["@arg1"].Value = 10;
	cmd.Parameters["@arg2"].Value = 20;
	conn.Open();
	cmd.ExecuteNonQuery();
	int result = (int)(cmd.Parameters["retvalue"].Value);    // get the return value from the sp
	conn.Close();
	return result;
	}

Writing Stored Procedures that return a Resultset

If you want to write a Stored Procedure that returns a ResultSet, you use the SETRESULTSET() function of the 4GL. Using the Universal .NET Data Provider, you can then execute the 4GL Stored Procedure and return the ResultSet to the client application for processing. ResultSets that are returned from Stored Procedures are read-only.

Example Stored Procedure called "sp_myproc":

parameter query
select * from customers &query into cursor "mydata"
return setresultset("mydata")

Example calling the Stored Procedure from C# .NET:

////////////////////////////////////////////////////////////////////////
// include the references below
using System.Data;
using Recital.Data;

////////////////////////////////////////////////////////////////////////
// sample code to call a stored procedure that returns a ResultSet
public void CallStoredProcedure()
{
	RecitalConnection conn = new 
		RecitalConnection("Data Source=localhost;Database=southwind;uid=?;pwd=?");
	RecitalCommand cmd = new RecitalCommand();
	cmd.Connection = conn;
	cmd.CommandText = "sp_myproc(@query)";
	cmd.CommandType = CommandType.StoredProcedure;
	cmd.Parameters["@query"].Value = "where not deleted()";
	conn.Open();
	RecitalDataReader dreader = cmd.ExecuteReader();
	int sqlcnt = (int)(cmd.Parameters["sqlcnt"].Value);    // returns number of affected rows
	while (dreader.Read())
	{
		// read and process the data
	}
	dreader.Close();
	conn.Close();
}

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Shared library support on Mac

For building shared libraries on the MAC the following need to be set

1. The shared library file extension should be .dylib
2. The compile flag is -dynamic

For accessing the shared libraries at runtime

1. DYLD_LIBRARY_PATH needs to be set to the location of the shared libraries

Useful utilities for shared library support

1. The following command will display the table of contents of the dynamically linked library

		otool -TV sharedlibraryfile.dylib

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Announcing Recital 10

After an extended period of intense software development, we are pleased to announce the release of Recital 10 which is a milestone in our development efforts.

Recital 10 is comprised of major new versions of all of our products (which are all now Cluster Ready) as well as some new products, and a collection of open source technologies fully supported by ourselves to our customer base.

The Recital 10 release notes can be found here.

Recital
A powerful scripting language with an embedded database used for developing desktop database applications on Linux and Unix.
Recital Server
A cross-platform SQL database and application server.
Recital Web
A server-side scripting language with an embedded SQL database for creating web 2.0 web applications.

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Using the Recital RTOS() function

RTOS()

Syntax

RTOS( [ <workarea> ] )

Description

The RTOS() function returns all the fields in the current row as a string. The string will begin with the unique row identifier and then the deleted flag, followed by the data in the record. An optional workarea can be specified, otherwise the current workarea will be used

Example

use backup in 0
use accounts in 0
nrecs=reccount()
for i = 1 to nrecs
  if rtos(accounts) != rtos(backup)
     debug("record "+recno()+" don't match")
  endif
next

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Menu Key

TIP
To access the menu bar in Recital, press the / key.

Full details on Recital Function Keys can be found in the Key Assist section of the Help menu, or in our documentation wiki here.

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Tagged under

TECHTIP

Using the Recital DIE() function

Recital 10 introduced the DIE( )and EXIT( ) functions. These functions operates in the same way as the PHP DIE( ) and EXIT( ) functions. They output a message and terminate the current session in both Recital and Recital Web.

try
  open database southwind
catch
  die("Cannot open database, please try later.")
endtry

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Using the Recital FOREACH statement

Recital 10 introduced a FOREACH command, much like PHP and some other languages. This simply gives an easy way to iterate over arrays. foreach works on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes; the second is a minor but useful extension of the first:

FOREACH array_expression AS value
    statements...
ENDFOR

FOREACH array_expression AS key => value
    statements...
ENDFOR

The first form loops over the array given by array_expression. On each loop, the value of the current element is assigned to value and the internal array pointer is advanced by one (so on the next loop, you'll be looking at the next element).
The second form does the same thing, except that the current element's key will be assigned to the variable key on each loop. This form works only on associative arrays and objects.

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HOWTO: Install and run Adobe Air on Fedora 12 32bit Linux

In Adobe's own words:

"Adobe® AIR® is a cross-operating system runtime that lets developers combine HTML, Ajax, Adobe Flash®, and Adobe Flex® technologies to deploy rich Internet applications (RIAs) on the desktop."

The outcome of this combination of technologies is that developers can design and render quite beautiful user interfaces cross platform. For us desktop Linux users it is nice to have

an additional avenue for obtaining and running attractive desktop applications.

Examples of great Adobe air applications are Adobe.com for My Desktop, TweetDeck and the Times Reader. You can download these applications and many more at the Adobe Marketplace.

The easiest way to install Adobe Air on Fedora 12 is to download the latest build from Adobe, click here.

Once you have downloaded the .bin file do the following at the shell:

su -
chmod +x AdobeAIRInstaller.bin
./AdobeAIRInstaller.bin

Once you have Air installed, there is a slight tweak you will have to do to get it running on Fedora 12, it is related to the security certificates. This can be remedied in one simple line at the shell prompt as root.

su -
for c in /etc/opt/Adobe/certificates/crypt/*.0; do aucm -n $(basename $c) -t true; done

What this line is doing is using the aucm which is the Adobe Unix certificate manager to set the certificates installed as trusted.
You will now be able to go to the Adobe Marketplace and download and run Air applications without any issues.

Enjoy!

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Accessing C-ISAM Files via the Recital C-ISAM Bridge

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

Click image to display full size

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

Click image to display full size

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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Overview

Creating and Editing Stored Procedures

Testing the Procedure

Getting return values

Example Stored Procedure called "sp_myproc":

Example calling the Stored Procedure from C# .NET:

Writing Stored Procedures that return a Resultset

Example Stored Procedure called "sp_myproc":

Example calling the Stored Procedure from C# .NET:

RTOS()

Syntax

Description

Example

Overview

.NET

JDBC

ODBC

Configuring the Recital C-ISAM Bridge

Step 1:

Step 2: Creating the Bridge File

Recital/SQL CREATE BRIDGE:

Recital CREATE BRIDGE/MODIFY BRIDGE worksurface:

Using the Bridge

SQL:

Recital/4GL:

Indexes

Appendix 1: Data Types

Appendix 2: C-ISAM RDD Error Messages

More...

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