Bridge Specifications
| Vendor | ISO |
| Tool Name | Fixed Width File |
| Tool Version | N/A |
| Tool Web Site | https://en.wikipedia.org/wiki/Flat-file_database |
| Supported Methodology | [File System] Data Store (Physical Data Model) via TXT File |
SPECIFICATIONS
Tool: ISO / Fixed Width File version N/A via TXT File
See https://en.wikipedia.org/wiki/Flat-file_database
Metadata: [File System] Data Store (Physical Data Model)
Component: PositionalFile version 11.0.0
OVERVIEW
This bridge creates metadata for data files of type Fixed Width File.
Such metadata cannot be automatically detected (reverse engineered) by sampling the data files (e.g. customers.dat or even just customers with no extension).
Therefore, this bridge imports a 'Fixed Width File Definition' file which must be with extension .fixed_width_file_definition format file
(e.g. customers.dat.fixed_width_file_definition format file will create the metadata of a file named file customers with the fields defined inside)
This is the equivalent of a RDBMS DDL for fixed width files. With such a long extension, this data definition file can coexist with the actual data files in the each file system directory containing them.
The 'Fixed Width File Definition' file format is defined as follows:
- Format file must start with the following header:
column name, offset, width, data type, comment
- All offsets must be unique and greater than or equal to 0.
a,0
b,4
- The file format is invalid when some columns have offsets and others don't.
a,0
b,
c,4
- When all columns do not have offsets but have widths the application assumes that columns are ordered and calculates offsets based on widths.
a,,4 -> a,1,4
b,,25 -> b,5,25
- When the offset is present the application uses widths for documentation only.
a,1,4
b,5,25
- Types and comments are used as documentation only.
a,1,4,int
b,5,25,char[25],identifier
This bridge detects the following data types: INTEGER, FLOAT, STRING, DATE, BOOLEAN.
Bridge Parameters
| Parameter Name | Description | Type | Values | Default | Scope |
| File | The bridge uses the fixed_width_file_definition file as input. | FILE | *.fixed_width_file_definition | Mandatory | |
| Miscellaneous | Specify miscellaneous options starting with a dash and optionally followed by parameters, e.g. -connection.cast MyDatabase1="SQL Server" Some options can be used multiple times if applicable, e.g. -connection.rename NewConnection1=OldConnection1 -connection.rename NewConnection2=OldConnection2; As the list of options can become a long string, it is possible to load it from a file which must be located in ${MODEL_BRIDGE_HOME}\data\MIMB\parameters and have the extension .txt. In such case, all options must be defined within that file as the only value of this parameter, e.g. ETL/Miscellaneous.txt GENERAL OPTIONS -m <Java Memory's maximum size> 1G by default on 64bits JRE or as set in conf/conf.properties, e.g. -m 8G -m 8000M -j <Java Runtime Environment command line options> This option must be the last one in the Miscellaneous parameter as all the text after -j is passed "as is" to the JRE, e.g. -j -Dname=value -Xms1G The following option must be set when a proxy is used to access internet (this is critical to access https://repo.maven.apache.org/maven2/ (and exceptionally a few other tool sites) in order to download the necessary third party software libraries. -j -Dhttp.proxyHost=127.0.0.1 -Dhttp.proxyPort=3128 -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=3128 -Dhttp.proxyUser=user -Dhttp.proxyPassword=pass -Dhttps.proxyUser=user -Dhttps.proxyPassword=pass -jre <Java Runtime Environment full path name> It can be an absolute path to javaw.exe on Windows or a link/script path on Linux, e.g. -jre "c:\Program Files\Java\jre1.8.0_211\bin\javaw.exe" -v <Environment variable value> None by default, e.g. -v var1=value1 -v var2="value2 with spaces" -model.name <model name> Override the model name, e.g. -model.name "My Model Name" -prescript <script name> The script must be located in the bin directory, and have .bat or .sh extension. The script path must not include any parent directory symbol (..). The script should return exit code 0 to indicate success, or another value to indicate failure. For example: -prescript "script.bat arg1 arg2" -cache.clear Clears the cache before the import, and therefore will run a full import without incremental harvesting. Warning: this is a system option managed by the application calling the bridge and should not be set by users. FILE SYSTEM OPTIONS -tps <Processing Thread Pool Size's maximum count> By default 1, for e.g. -tps 10 -tl <Processing Time Limit duration> No limits by default. Time can be specified in seconds, minutes, or hours, e.g. -tl 3600s -tl 60m -tl 1h -fl <Processing File Limit count> No limits by default, e.g. -fl 100 -hadoop <Hadoop configuration options> None by default, e.g. -hadoop key1=val1;key2=val2 -fresh.partition.models Use to import latest modified files when processing partitions defined in Partitioned directories parameter. -subst <path> <new path> Use to associate a root path part with a drive or another path, e.g. -subst K: C:/test -skip.download Use to disable dependencies downloading and use only download cache -disable.partitions.autodetection Use this option to disable automatic partitions detection(when "Partition directories" option is empty) DELIMITED FILE OPTIONS -delimited.no_header Delimited File's header by default, bridge automatically tries to detect headers while processing csv files(basing on header columns types), use this option to disable headers import(f.e. to hide sensitive data) -delimited.top_rows_skip <number> Delimited file's number of rows to skip while processing (0 by default), e.g. -delimited.top_rows_skip 1 -delimited.extra_separators <comma separated separators> Delimited file's extra delimiters (separators by default are ), e.g. -delimited.extra_separators ~,||,|~ PARQUET FILE OPTIONS -parquet.compressed.max.size=<value> Ignore parquet archives with size bigger then defined with this option value (Default value is 10 000 000 bytes), e.g. -parquet.compressed.max.size=10000000 |
STRING |
Bridge Mapping
Mapping information is not available