Difference between revisions of "C-ISAM Data Files"
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On UNIX and Linux platforms, Recital Terminal Developer, Recital Mirage Server and the Recital Database Server support access to Informix compliant C-ISAM files. | On UNIX and Linux platforms, Recital Terminal Developer, Recital Mirage Server and the Recital Database Server support access to Informix compliant C-ISAM files. | ||
Data access is achieved through a C-ISAM Bridge. This requires the creation of a Bridge file and an empty Recital table that has the same structure as the C-ISAM file. | Data access is achieved through a C-ISAM Bridge. This requires the creation of a Bridge file and an empty Recital table that has the same structure as the C-ISAM file. | ||
| − | Creating the Recital Table | + | |
| + | ==See Also== | ||
| + | [[ALTER TABLE]], [[CREATE]], [[CREATE BRIDGE]], [[SQL CREATE BRIDGE|CREATE BRIDGE (SQL)]], [[CREATE TABLE]], [[DISPLAY STRUCTURE]], [[Error Messages: C-ISAM RDD|Error Messages]], [LIST STRUCTURE]], [[MODIFY STRUCTURE]], [[SQL SELECT|SELECT]], [[USE]] | ||
| + | |||
| + | ==Creating the Recital Table== | ||
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. | 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 table should be given a ’.str’ file extension (rather than the default ’.dbf’) to signify that this is a structure file only. | + | To create the table, use the [[CREATE TABLE|SQL CREATE TABLE]] command or the Recital Terminal Developer [[CREATE]] worksurface. 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 section for information on matching Informix and Recital data types. | Please see the end of this section for information on matching Informix and Recital data types. | ||
| − | Creating the Bridge File | + | ==Creating the Bridge File== |
| − | In Recital Terminal Developer, the Bridge File can be created using the CREATE BRIDGE worksurface. For Recital Database and Mirage Server clients, the Bridge File can be created in two ways: by using an ’ini’ file, or by the SQL CREATE BRIDGE command. | + | In Recital Terminal Developer, the Bridge File can be created using the [[CREATE BRIDGE]] worksurface. For Recital Database and Mirage Server clients, the Bridge File can be created in two ways: by using an ’ini’ file, or by the [[CREATE BRIDGE|SQL CREATE BRIDGE]] command. |
| − | Maximums Widths | + | ====Maximums Widths==== |
The following maximum widths apply to the bridge elements: | The following maximum widths apply to the bridge elements: | ||
| Line 34: | Line 35: | ||
| − | ’ini’ file | + | |
| + | ====’ini’ file=== | ||
Firstly, an ’ini’ file should be created on the server in the data directory where the C-ISAM file is held. The ini file has the following structure: | Firstly, an ’ini’ file should be created on the server in the data directory where the C-ISAM file is held. The ini file has the following structure: | ||
| + | <pre> | ||
[bridge] | [bridge] | ||
bridgetype=<bridgetype> | bridgetype=<bridgetype> | ||
| Line 42: | Line 45: | ||
databasename=<name of the Recital structure table> | databasename=<name of the Recital structure table> | ||
alias=<the name to use to access your file> | alias=<the name to use to access your file> | ||
| + | </pre> | ||
e.g. cisamdemo.ini | e.g. cisamdemo.ini | ||
| + | <pre> | ||
[bridge] | [bridge] | ||
bridgetype=CISAM | bridgetype=CISAM | ||
| Line 50: | Line 55: | ||
databasename=cisamstru.str | databasename=cisamstru.str | ||
alias=cisamdemo | alias=cisamdemo | ||
| + | </pre> | ||
| + | |||
NOTE: There should be no white space either side of the ’=’ signs. | NOTE: There should be no white space either side of the ’=’ signs. | ||
| − | The Bridge file can now be created from the ini file. This can be given a ’.dbf’ file extension (rather than the default ’.brg’) so that it can be accessed like a normal Recital table. The SQL EXECUTE IMMEDIATE command is used to run the Recital/4GL CREATE BRIDGE FROM command: | + | The Bridge file can now be created from the ini file. This can be given a ’.dbf’ file extension (rather than the default ’.brg’) so that it can be accessed like a normal Recital table. The SQL [[EXECUTE IMMEDIATE]] command is used to run the Recital/4GL [[CREATE BRIDGE|CREATE BRIDGE FROM]] command: |
e.g. | e.g. | ||
| + | <code lang="recital"> | ||
create bridge cisamdemo.dbf from cisamdemo | create bridge cisamdemo.dbf from cisamdemo | ||
| + | </code> | ||
| − | CREATE BRIDGE (SQL) | + | |
| − | The CREATE BRIDGE SQL command defines and creates the bridge in one step: | + | ====CREATE BRIDGE (SQL)==== |
| + | The [[SQL CREATE BRIDGE|CREATE BRIDGE]] SQL command defines and creates the bridge in one step: | ||
e.g. | e.g. | ||
| + | |||
| + | <code lang="recital"> | ||
exec sql | exec sql | ||
CREATE BRIDGE cisamdemo.dbf | CREATE BRIDGE cisamdemo.dbf | ||
| Line 75: | Line 87: | ||
CREATE BRIDGE cisamdemo.dbf | CREATE BRIDGE cisamdemo.dbf | ||
AS "TYPE=CISAM;EXTERNAL=cisamdemo.dat;METADATA=cisamdemo.str;ALIAS=cisamdemo"; | AS "TYPE=CISAM;EXTERNAL=cisamdemo.dat;METADATA=cisamdemo.str;ALIAS=cisamdemo"; | ||
| + | </code> | ||
| − | Using the Bridge | + | |
| + | ==Using the Bridge== | ||
The Bridge can now be used. To access the C-ISAM file, use the ’alias’ specified in the Bridge definition. | The Bridge can now be used. To access the C-ISAM file, use the ’alias’ specified in the Bridge definition. | ||
e.g. | e.g. | ||
| + | <code lang="recital"> | ||
Select * from cisamdemo | Select * from cisamdemo | ||
| + | </code> | ||
| + | |||
==Data Types== | ==Data Types== | ||
Revision as of 15:57, 25 March 2009
On UNIX and Linux platforms, Recital Terminal Developer, Recital Mirage Server and the Recital Database Server support access to Informix compliant C-ISAM files.
Data access is achieved through a C-ISAM Bridge. This requires the creation of a Bridge file and an empty Recital table that has the same structure as the C-ISAM file.
Contents
See Also
ALTER TABLE, CREATE, CREATE BRIDGE, CREATE BRIDGE (SQL), CREATE TABLE, DISPLAY STRUCTURE, Error Messages, [LIST STRUCTURE]], MODIFY STRUCTURE, SELECT, USE
Creating the Recital Table
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 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 section for information on matching Informix and Recital data types.
Creating the Bridge File
In Recital Terminal Developer, the Bridge File can be created using the CREATE BRIDGE worksurface. For Recital Database and Mirage Server clients, the Bridge File can be created in two ways: by using an ’ini’ file, or by the SQL CREATE BRIDGE command.
Maximums Widths
The following maximum widths apply to the bridge elements:
| Element | Maximum Width in Characters | Description |
|---|---|---|
| Type | 10 | Bridge type: CISAM |
| External | 80 | External file name |
| Metadata | 80 | Recital ’structure’ table name |
| Alias | 10 | Alias name |
=’ini’ file
Firstly, an ’ini’ file should be created on the server in the data directory where the C-ISAM file is held. The ini file has the following structure:
[bridge] bridgetype=<bridgetype> externalname=<name of the C-ISAM file> databasename=<name of the Recital structure table> alias=<the name to use to access your file>
e.g. cisamdemo.ini
[bridge] bridgetype=CISAM externalname=cisam.dat databasename=cisamstru.str alias=cisamdemo
NOTE: There should be no white space either side of the ’=’ signs.
The Bridge file can now be created from the ini file. This can be given a ’.dbf’ file extension (rather than the default ’.brg’) so that it can be accessed like a normal Recital table. The SQL EXECUTE IMMEDIATE command is used to run the Recital/4GL CREATE BRIDGE FROM command:
e.g.
create bridge cisamdemo.dbf from cisamdemo
CREATE BRIDGE (SQL)
The CREATE BRIDGE SQL command defines and creates the bridge in one step:
e.g.
exec sql CREATE BRIDGE cisamdemo.dbf TYPE "CISAM" EXTERNAL "cisamdemo.dat" METADATA "cisamdemo.str" ALIAS "cisamdemo"; //or exec sql CREATE BRIDGE cisamdemo.dbf AS "TYPE=CISAM;EXTERNAL=cisamdemo.dat;METADATA=cisamdemo.str;ALIAS=cisamdemo";
Using the Bridge
The Bridge can now be used. To access the C-ISAM file, use the ’alias’ specified in the Bridge definition.
e.g.
Select * from cisamdemo
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 |
