DatabaseDeleter
Delete rows in a database table based on the condition specified.
Input Ports
Input
This transformer accepts any feature.
Output Ports
This transformer has no output ports.
Parameters
Database To Update
Format and Dataset
Select the format and dataset where the table resides, including any format-specific parameters.
General
Table
Specify the table to delete rows from. Click the Browse button to select the table from a list retrieved from the database. Note that you can only select this after you have completely specified the database format, dataset, and format-specific parameters.
Condition
Specify how to identify the rows to delete. This can either be done through Match Column(s) or through a WHERE Clause.
WHERE Clause
Use a SQL WHERE clause to identify matching records to delete.
An example clause is the following:
id = 'roads'
Match On
Match On
Specify the columns and their values used to identify matching records. A record match occurs when the contents of the row for the columns listed exactly equal the corresponding value.
In the Table Column field, click the Browse button to select from a list of all the columns in the database table. Note this only works after you have completely specified the database format, dataset, format-specific parameters, and picked a table.
Usage Notes
The DatabaseDeleter uses FME Writers to perform deletes on tables. Each DatabaseDeleter may have its own database connection, potentially not shared with other writers and transformers. If it is necessary to share a single connection or to change options on the writer that are not available in the DatabaseDeleter, use a writer directly instead.
See FME Readers and Writers > Feature Operations or specific writer documentation for more information on how writers will respond to deleting rows.
Unlike FME Writers, fme_db_operation and fme_where attributes are not supported on DatabaseDeleter input features.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Defining Values
There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.
How to Set Parameter Values
Using the Text Editor
The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.
Text Editor
Using the Arithmetic Editor
The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.
Arithmetic Editor
Conditional Values
Set values depending on one or more test conditions that either pass or fail.
Parameter Condition Definition Dialog
Content
Expressions and strings can include a number of functions, characters, parameters, and more.
When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.
Dialog Options - Tables
Transformers with table-style parameters have additional tools for populating and manipulating values.
Table Tools
Row Reordering
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Enabled once you have clicked on a row item. Choices include:
- Add a row
- Remove a row
- Move current row up one
- Move current row down one
- Move current row to top
- Move current row to bottom
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Cut, Copy, and Paste
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Enabled once you have clicked on a row item. Choices include:
- Cut a row - delete and copy to clipboard
- Copy a row to the clipboard
- Paste a row from the clipboard
Cut, copy, and paste may be used within a transformer, or between transformers.
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Filter
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Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.
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Import
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Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
Reset/Refresh
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Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.
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Note: Not all tools are available in all transformers.
FME Community
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