OpenSCADA

Modules/FireBird

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Module Name Version License Source Languages Platforms Type Author Description
FireBird DB FireBird
  • Features: SQL, LIST, STRUCT, GET, SEEK, PRELOAD, SET, DEL, FIX, TR
3.0 GPL2 bd_FireBird.so en,uk,ru,de x86,x86_64,ARM DB Roman Savochenko
  Maxim Lysenko, 2009 — the page initial translation
DB module. Provides support of the DBMS FireBird.

The module provides OpenSCADA with support for the FireBird DBMS, and InterBase, which is a small and embedded DBMS with network functions and support for SQL queries. FireBird is built on the basis of the commercial InterBase DBMS and is distributed under a free license. You can familiarize yourself with the DBMS at http://www.firebirdsql.org. The module is based on the database API's library in the language "C" and it allows you to perform actions on databases, tables and table contents.

Contents

1 Operations over the database

The operations of opening and closing of the database is supported, with the possibility of creating a new database when you open and delete existing at the close. In terms of the subsystem "DB" of OpenSCADA, opening of DB is its registration for further using of the program. It also supports the operation of requesting the list of tables in the database.

The FireBird DBMS is addressed by specifying the database file name, user name and password. In general, address of the database is written in this way: {file};{user};{pass}[;{conTm}]. Where:

2 Operations over the table

Supports opening, closing tables, with the possibility of creating a new table when opening and removing an existing one when closed, as well as querying the structure of the table.

3 Operations over the table content

API of the subsystem "DB" suppose the access to the contents of the table on the value of key(s) fields. Thus, the operation of requesting of the record implies the preset of key columns of the object TConfig, which will do the request. Creating a new record (row) is performed by setting the record values that are missing.

The module allows you to dynamically change the structure of the database tables FireBird. So, in the case of inconsistency between the structure of the table and the structure of the record being set, the structure of the table will be brought to the desired structure of the record. In the case of requesting the record values and discrepancies between record structures and tables, only the values of the general entries of the record and the table will be obtained. The module does not track the order of the elements in the record and in the structure of the table, in addition to this, the operation of changing the column type is not safe and the data in the changing columns will be lost!

The module implements the mechanism of supporting multilingual text variables. For fields with a multilingual text variable, columns of individual languages are created in the format " {lang}#{FldID}" (en#NAME). In this case, the base column contains values for the base language. Columns of individual languages are created when needed when saving to a DB and when execution OpenSCADA in the corresponding locale. In the absence of values for a particular language, the value for the base language will be used.

Types of elements of the FireBird DBMS correspond to types of elements of OpenSCADA in the following way:

Types of OpenSCADA fields Types of fields of DBMS FireBird
TFld::String VARCHAR, BLOB SUBTYPE TEXT
TFld::Integer INTEGER
TFld::Real DOUBLE
TFld::Boolean SMALLINT

4 DB access

Access rights to the database are defined by the rights to the DB file.

Briefly we will look at the initial configuration of the FireBird server to connect for it using by this module:

5 Productivity of the DBMS

Measurement of the DBMS productivity were carried out by the test "DB" of the tests module "SystemTests", performing operations over the records of the structure: "name char (20), descr char (50), val double (10.2), id int (7), stat bool, reqKey string, reqVal string".

Operations for 1000 records, seconds FireBird 2.5
AMD Turion L625 1.6, 2G, FireBird [2.1.3 Local SuperServer; 100Base-TX; 2.5.2 100Base-TX SuperServer ForcedWrites=Off; ForcedWrites=On]
Intel(R) Core(TM) i3 CPU 1.33GHz, 3G, HDD [2.5.2 100Base-TX SuperServer ForcedWrites=Off; ForcedWrites=On]
FireBird 3
Intel(R) Core(TM) i7 CPU 2.6GHz, 12G, FastSSD, Local network
Creating: [0.93; 1.15; 4.4; 5.2]; [3.68; 4.67] 0.5
Updating: [2.74; 2.94; 5.1; 5.2]; [3.88; 4.54] 0.47
Getting: [1.64; 2.22; 5.0; 27.8]; [3.69; 28.8] 2.95
Seeking: - ; [5.36; 32] 3.3
Seeking in preload: - ; [0.045; 0.065] 0.047
Deleting: [0.65; 1.04; 2.0; 2.4]; [1.69; 1.66] 0.17

6 Notes

The DBMS FireBird has more architecture's limits and problems by the InterBase inheritance and from parent OS MS Windows which prevent it wide using for more tasks. Known limits and problems:

Modules/FireBird/en - GFDLDecember 2024OpenSCADA 1+r3000