Here's how to set up field validation based on dynamic values from another table.
Using the products.dbf table from the southwind sample database, validation can be added to the categoryid field to ensure it matches an existing categoryid from the categories.dbf table.
open database southwindThe rlookup() function checks whether an expression exists in the index (master or specified) of the specified table . An attempt to update categoryid with a value not in the list will give an error: Validation on field 'CATEGORYID' failed.
alter table products add constraint;
(categoryid set check rlookup(products.categoryid,categories))
If you have access to the Recital Workbench, you can use the modify structure worksurface to add and alter your dictionary entries, including a customized error message if required.
The Recital Oracle Gateway requires the Oracle libclntsh.so shared library. If this file is unknown to ld.so.conf, add it using the ldconfig command.
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. |
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. |
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.
APPEND FROM <table-name>Before when appending into a shared Recital table each new row was locked along with the table header, then unlocked after it was inserted. This operation has now been enhanced to lock the table once, complete inserting all the rows from the table and then unlock the table. The performance of this operation has been increased by using this method. All the database and table constraints are still enforced.
There's a nice article on IBM developerworks describing how to package software using RPM. You can read it here.
On exit of an .rsp page.
SAVE DATASESSION TO m_state
_SESSION["state"] = m_state
On entry to an .rsp page.
IF type( _session["state"] ) != "U"
m_state = _session["state"]
RESTORE DATASESSION FROM m_state
ENDIF
If you have 4 GB or more RAM use the Linux kernel compiled for PAE capable machines. Your machine may not show up total 4GB ram. All you have to do is install PAE kernel package.
This package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE).
The non-PAE kernel can only address up to 4GB of memory. Install the kernel-PAE package if your machine has more than 4GB of memory (>=4GB).
# yum install kernel-PAE
If you want to know how much memory centos is using type this in a terminal:
# cat /proc/meminfo
The Openfiler NAS/SAN Appliance (NSA) is a Storage Management Operating System / NAS Appliance distribution. It is powered by the Linux 2.6 kernel and Open Source applications such as Apache, Samba, LVM2, ext3, Linux NFS and iSCSI Enterprise Target. Openfiler combines these ubiquitous technologies into a small, easy to manage solution fronted by a powerful web-based management interface. Openfiler allows you to build a Network Attached Storage (NAS) and/or Storage Area Network (SAN) appliance, using industry-standard hardware, in less than 10 minutes of installation time.
Building upon the popularity of server virtualization technologies such as VMware, Virtual Iron, and Xen, Openfiler can also be deployed as a virtual machine instance or on a bare metal machine.
This deployment flexibility of Openfiler ensures that storage administrators are able to make the best use of system performance and storage capacity resources when allocating and managing networked storage in a multi-platform environment.
Openfiler is ideally suited for use with High Availability Recital applications as it incorporates:
- Heartbeat cluster manager
- drbd disk replication
- CIFS
- NFS
- Software and hardware RAID
- FTP
- rsync
- HTTP/DAV
- iSCSI
- LVM2
- Multiple NIC bonding for High Availability
- Powerful web-based GUI
Some options of hdparm are dangerous and are generally listed as such in the man page.
Hdparm is available from SourceForge and there is even a version for Windows.